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  1. #181
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by NewLandy View Post
    Look at the 2 attachments, CT gets on average 3100 sunshine hours/ year, while JHB gets only 1000!

    I find that hard to believe, but who knows.
    So yes, your 3.5KW array in CT probably produces 2-3 times more power as the equivalent array in JHB.
    Correct. I was floored too.

    As I said, when talking over regions ito solar systems, keep in mind that:
    Cpt is in winter rainfall region with long daylight hours in summer with no winter heating smog.
    Jhb/Pta in summer has high-veld storms in the afternoons, summer rains, with winters the heating requirements of people that generates a bit of smog.

    And Cpt has more irradiation per sqm than Guateng. Investigate this site a bit: https://sauran.ac.za/
    Last edited by the_terrible_triplett; 2020/06/20 at 08:19 PM.
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  2. #182
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by the_terrible_triplett View Post
    Absolutely misunderstood. My apologies ... in my defense, it seldom happens like this. Again, my apologies.
    But, it also derails the thread from new knowledge to what is this problem.
    Then again, if done right, problems like this can share knowledge faster!

    So lets try.

    Generally speaking ... Why an array does not preform is a tough to find.
    The most obvious:
    Are there enough loads to make the array work at peak performance?
    Angle of the array as best as it can be for where you are?
    Do you get the peak volts from the panels when the system is unloaded i.e. close as damn to the max volts the panels van give?
    When last did you check the wires between all the panels?
    Wire size acceptable or large voltage drop?
    Are the settings correct on the system? As I wrote, if you limit a Victron inverter, the DC side, the overall system performance drops so you never see peak array performance either.
    And the fuses, all fine?
    Anyone else any ideas to check?

    If all salient stuff has been checked and all is fine, then it gets rather uncomfortable, BUT has to be asked, and not necessarily answered here ...
    The Quality of the:

    Panels?
    MPPT?
    Inverter?

    For some has replace parts on same setup, and have seen a marked performance increase / decrease on either the same array i.e. new MPPT/Inverter.
    Or same equipment, different brand of panels.

    FWIW: That is why I mention Canadian solar, to keep talking apples for apples.


    I wrote that I have 5 strings on 5 NoArk breakers.
    Why: Exactly for this reason. I can switch them all off, and then swtich each string on, one by one, then off for the next one, to see if any string misbehaves.
    Got gatvol of wondering if the array preforms see.
    I think I'll be spending a lot of time on the roof soon..

  3. #183
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by faniedup View Post
    Maybe we should have freedom to discuss our experiences rather than to conform to your preconceived ideas?
    Quote Originally Posted by faniedup View Post
    How does genitals come into play here?
    Do you have an inferiority complex
    Freedom ... Over the years I have seen many many threads derail completely, diffusing the efforts people make to try and share knowledge.
    Genitals ... It was a joke.
    Inferiority ... Refer ^^^

    Drop me a PM, start a new thread ... I'm not derailing this one any further.
    Last edited by the_terrible_triplett; 2020/06/20 at 08:34 PM.
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  5. #184
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by NewLandy View Post
    I think I'll be spending a lot of time on the roof soon..
    Check for unintended shading too ...
    Political Correctness
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by NewLandy View Post
    Look at the 2 attachments, CT gets on average 3100 sunshine hours/ year, while JHB gets only 1000!

    I find that hard to believe, but who knows.
    So yes, your 3.5KW array in CT probably produces 2-3 times more power as the equivalent array in JHB.
    May be these 2 graphs would explain the contrary.
    Cape Town
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    Johannesburg
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    CT do indeed have more rainy hours per year. Jhb had a lot of cloud this year without actual rain.

    2016 had about 50% less solar than 2018 from live figures.

    @New Landy - Have a look at the live figures from Bushpower and then compare it to your figures. On a day to day I find my figures very close to theirs based on the actual PV installed. They have a 9.4kW PV installation.
    Last edited by ekkekan; 2020/06/20 at 08:35 PM. Reason: Added Bushpower comment

  7. #186
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    Default Re: Solar System for Home ( yet another :)

    The thing with solar....no year will be the same.
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by Prof View Post
    The thing with solar....no year will be the same.
    Indeed. But wat worries me, is that it's the same with Eskom.
    Edit: Correction no it's not - at least we know the sun is more reliable than Eskom will ever be. But this is why I'm on this thread and I'm grateful for all the good info [tidbits ]. And, it's good to know / keep in mind that sun conditions are not always the same.
    Last edited by plcomp; 2020/06/21 at 09:21 AM.

  9. #188
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    Default Re: Solar System for Home ( yet another :)

    Thank you sir! Just couple more questions please.

    Quote Originally Posted by the_terrible_triplett View Post




    I would move to 48v ... I tried 24v gird-tied, it works perfectly, but 48v is just easier.
    Yes, you can connect up to 6 identical inverters in parallel - if you must.
    The only difference between 1 x 5kva (4kw) and 2 x 3kva (4.8kw), is the price. I guess it is like R25k vs R30k for 2 x 3kva's.
    And having two gives redundancy.

    So if finances (or lack thereof) is a real thing currently, and my intention currently is mainly load shedding backup, the 24V system is fine for my current needs. The only issue I would later have is extra space required for the 2nd Multiplus, and missing out on an initial cost saving of R5k. That and 48V will be kinder to my batteries?

    And just to be absolutely sure, by running 2 inverters, the watts and the volts will double? 3Kva to 6 and 24V to 48?




    Moment you grid tie, not a UPS, you have to have a Venus and Carlo.
    I would start with that if you are committed to Victron, to start getting the data.

    I think I need a little more understanding here. I understand the Multi can do both. But what is the main difference between grid tie and the ups function? Can these not function simultaneously?



    Have a read here: https://www.victronenergy.com/live/e...llation-manual I will go and read there
    ESS is where the magic automatically happens.
    On your 400ah AGM bank, with a BMV, you set the SOC to say 80% / DOD 20% because you only want to use 20% of the batts being lead acid. 20% being their sweet spot ito cycles irght?
    Once you set that on ESS, you let the system do its thing.
    Next level, you may want to run a Cron Job like I do, to further tweak your usage IF that is needed. That is University level thread chat ... ideal if we have a a few Victron users here, to go to that level.


    [COLOR=#ff0000]

    Yes, you do need a 2nd DB. Why? in very simplistic terms, all the loads you want kept powered off the batts goes onto that DB.

    I'm not a sparkie, but the wiring is simple.
    From the main DB there is a wire to the garage already, right? Yes
    So I would guess, sparkies to confirm, all you need is to connect the Multi AC_In to that DB in the garage, using a double pole breaker. No db in the garage.
    Then from the Multi AC_Out1, a wire goes, as you said, to the 2nd DB in the house, the DB that has the Always On loads you want powered off batteries at night when Eskom is off.
    Only one db in the house. Nothing in the garage except 2 plug sockets. I considered using the one socket as a direct line to the house db, but a sparky friend told me that wire is only 2,5mm and has to be at least 5-6mm because it will be providing a source (from the inverter to the 2nd db which must be setup in the house, close to the main db.

    So either I take chance to pull a new wire through the exisiting conduit piping, or route 2 new wires from the garage to and from the db's in the house.
    Nico Swart

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  10. #189
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by Die SwartKat View Post
    So if finances (or lack thereof) is a real thing currently, and my intention currently is mainly load shedding backup, the 24V system is fine for my current needs. The only issue I would later have is extra space required for the 2nd Multiplus, and missing out on an initial cost saving of R5k. That and 48V will be kinder to my batteries?

    If you have a 24v in place already, nothing wrong with that at all.
    The 2 x MP II must be as close to each other as you can, that is ideal yes.
    And 48v is kinder to batteries yes, less amps drawn and more batts so large ah bank.

    Quote Originally Posted by Die SwartKat View Post
    And just to be absolutely sure, by running 2 inverters, the watts and the volts will double? 3Kva to 6 and 24V to 48?

    O no, the inverter is either 12/24/48v - that never changes.
    All that changes is that if you parallel them, the AC out increases.

    Quote Originally Posted by Die SwartKat View Post
    I think I need a little more understanding here. I understand the Multi can do both. But what is the main difference between grid tie and the ups function? Can these not function simultaneously?
    Multi is a UPS yes, like when you have no solar panels on it.
    If you add a MPPT and panels, it becomes a hybrid solar inverter.
    Now: The moment you link those solar panels to it, and it is connected to your DB, you are governed by SA regulations and ideally, you must stop it from feeding back to the grid.
    That is where the "brains" are required i.e. the VenusGX - to run the software called ESS - and the Carlo to not feed power back to the grid, using the VenusGX with ESS to manage that for you.

    Quote Originally Posted by Die SwartKat View Post
    Only one db in the house. Nothing in the garage except 2 plug sockets. I considered using the one socket as a direct line to the house db, but a sparky friend told me that wire is only 2,5mm and has to be at least 5-6mm because it will be providing a source (from the inverter to the 2nd db which must be setup in the house, close to the main db.

    So either I take chance to pull a new wire through the existing conduit piping, or route 2 new wires from the garage to and from the db's in the house.
    Good sparkie you've got. :-)
    If you do: (sparkie to confirm)
    Main DB to MPII in garage - you need a thicker wire yes, as that wire feeds the MPII AND the MPII feeds back to the main DB on that same wire.
    MPII to 2nd DB - if you limit the max current on the 2nd DB in the house, sparkie can confirm if the 2.5mm wire is sufficient - if you never change the 2nd DB later to have higher loads.
    Or, if the 2.5mm wire is pushing the envelope, replace both the wires with 5-6 even 10mm2 (costs a factor) and forget about it.
    That is if you cannot put the panels/MPPT/batteries closer to the main DB.

    My 2nd DB has a 20amp breaker max, the Schneider one. Had ACDC one first, not buying them again.
    The Shcneider switches the AC_out1 from the inverter, off, to the 2nd DB.
    I still miss a changeover switch, to switch the 2nd DB back to the main DB.
    Onesto surge protection, in case a surge comes back from say a phone line, dish, aerial or whatnot to 2nd DB. So surge protection in main DB and the 2nd DB gives more protection to the inverter, being surge protection before and after the inverter.
    The ABB was from a previous issue, so you don't need to buy that expensive.
    Rest is ACDC, wish I did not, but that is now a WANT, not a NEED.
    Let your Sparkie guide you here, point is, I physically have limited the 2nd DB wtih 20amps max.
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    Last edited by the_terrible_triplett; 2020/06/22 at 10:16 AM.
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  12. #190
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    Default Re: Solar System for Home ( yet another :)

    Re how the sun moves over ones roof, at what angles to mount the panels based on where one is, see if this helps:

    http://www.solarelectricityhandbook....alculator.html

    And this:

    http://shadowcalculator.eu/#/lat/-33...09637726385706
    Last edited by the_terrible_triplett; 2020/06/22 at 10:19 AM.
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    Default Re: Solar System for Home ( yet another :)

    And it matters not what inverter you use, this extensive guide on wiring and everything else around all things DC, is a very good read.

    https://www.victronenergy.com/upload...limited-EN.pdf
    Political Correctness
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    Default Re: Solar System for Home ( yet another :)

    Thank you TTT, just a few more points requiring clarification please.

    Quote Originally Posted by the_terrible_triplett View Post





    Multi is a UPS yes, like when you have no solar panels on it.
    If you add a MPPT and panels, it becomes a hybrid solar inverter.
    Now: The moment you link those solar panels to it, and it is connected to your DB, you are governed by SA regulations and ideally, you must stop it from feeding back to the grid.
    That is where the "brains" are required i.e. the VenusGX - to run the software called ESS - and the Carlo to not feed power back to the grid, using the VenusGX with ESS to manage that for you.

    So the inverter itself is not clever enough to not feed back into the grid? Is there no other way to stop this from happening? Because it seems the Venus GX alone is north of R4k and although I couldn't find this Carlo guy on the catalogue, he'll surely also be an expensive bloke.
    There must some other way of doing this?


    Good sparkie you've got. :-)
    If you do: (sparkie to confirm)
    Main DB to MPII in garage - you need a thicker wire yes, as that wire feeds the MPII AND the MPII feeds back to the main DB on that same wire.

    So the MPII cannot just be plugged into a wall socket for its AC in. That means I would need to route 3 wires? One from the main db for the MPII's AC in, and two separate ones AC 1 and AC 2 out from the MPII to the 2nd db?

    MPII to 2nd DB - if you limit the max current on the 2nd DB in the house, sparkie can confirm if the 2.5mm wire is sufficient - if you never change the 2nd DB later to have higher loads.
    Or, if the 2.5mm wire is pushing the envelope, replace both the wires with 5-6 even 10mm2 (costs a factor) and forget about it.
    That is if you cannot put the panels/MPPT/batteries closer to the main DB. I absolutely cannot get these closer to the main db.

    My 2nd DB has a 20amp breaker max, the Schneider one. Had ACDC one first, not buying them again.
    The Shcneider switches the AC_out1 from the inverter, off, to the 2nd DB.
    I still miss a changeover switch, to switch the 2nd DB back to the main DB. Yes I can see the importance of this. I want this done also.
    Onesto surge protection, in case a surge comes back from say a phone line, dish, aerial or whatnot to 2nd DB. So surge protection in main DB and the 2nd DB gives more protection to the inverter, being surge protection before and after the inverter.
    The ABB was from a previous issue, so you don't need to buy that expensive.
    Rest is ACDC, wish I did not, but that is now a WANT, not a NEED.
    Let your Sparkie guide you here, point is, I physically have limited the 2nd DB wtih 20amps max.
    Nico Swart

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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by Die SwartKat View Post
    So the inverter itself is not clever enough to not feed back into the grid? Is there no other way to stop this from happening? Because it seems the Venus GX alone is north of R4k and although I couldn't find this Carlo guy on the catalogue, he'll surely also be an expensive bloke.
    There must some other way of doing this?
    Any and all grid tied inverters has some way to stop them from feeding back, limit or manage the feedback. LAW expects it.
    Victron decided to go via the VenusGX, to add some more functionality, and not bother the UPS users with extra costs.
    Idea is you save on Eskom over years the R4.6k or whatever the VenusGX cost is not so bad at all.
    Batteries, now THEY are expensive. Panel frames and installer, that gets expensive.
    But not the VenusGX that makes it all work.
    Yeah, I know, the "north of R4k" makes no sense but still ...

    You can download the VenusGX software free of charge, and build your own VenusGX device ... me, I not that clued up.

    Carlo Gavazzi is all over ... geez prices went up Post-Lockdown ... https://www.google.com/search?client...+gavazzi+et112
    They used to be like +-R1100 ...

    Quote Originally Posted by Die SwartKat View Post
    So the MPII cannot just be plugged into a wall socket for its AC in. That means I would need to route 3 wires? One from the main db for the MPII's AC in, and two separate ones AC 1 and AC 2 out from the MPII to the 2nd db?
    No just 2 wires:
    Main DB to the MPII's AC_in - it feeds the main DB / draw from the main DB on this one wire.
    MPII AC_out1 to the 2nd DB - because you have the Carlo Gavazzi, therefor you don't touch the AC_Out2.

    Whole new kettle of fish you want to cook on the AC_out2 connected to the house. We don't do it here. Stick to the Carlo Gavazzi and nothing on AC_out2.

    As a UPS, one that is moveable, to feed it power to recharge the batts, yes, put a plug on AC_in, the caravan ones, those blue ones.
    But I'm not sure that you can do that, and connect to a DB, and not permanently.
    Some UPS oak out there did a similar solution, just plug that UPS into any plug (feeds the entire house via that plug) ... it was dubbed a suicide plug UPS.

    Quote Originally Posted by Die SwartKat View Post
    I absolutely cannot get these closer to the main db.
    100%.
    Last edited by the_terrible_triplett; 2020/06/22 at 02:37 PM.
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  17. #194
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    Default Re: Solar System for Home ( yet another :)

    My grid-tie system has been running just over a year now.

    If use this calculator with my size and angles I get really close to what they predict.
    https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html#PVP

    The site predict I would generate around 1.893Mwh for the year and the actual was 2.1Mwh. Which is actually pretty close.
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    Default Re: Solar System for Home ( yet another :)

    Aggenee man! Now you've lost me again.

    Quote Originally Posted by the_terrible_triplett View Post
    Any and all grid tied inverters has some way to stop them from feeding back, limit or manage the feedback. LAW expects it.
    Victron decided to go via the VenusGX, to add some more functionality, and not bother the UPS users with extra costs.
    Idea is you save on Eskom over years the R4.6k or whatever the VenusGX cost is not so bad at all.
    Batteries, now THEY are expensive. Panel frames and installer, that gets expensive.
    But not the VenusGX that makes it all work.
    Yeah, I know, the "north of R4k" makes no sense but still ...

    You can download the VenusGX software free of charge, and build your own VenusGX device ... me, I not that clued up.

    Carlo Gavazzi is all over ... geez prices went up Post-Lockdown ... https://www.google.com/search?client...+gavazzi+et112
    They used to be like +-R1100 ...

    What then about the MultiPlus II GX? Will this one not have these two gizmos integrated? https://www.victronenergy.com/inverters-chargers/multiplus-ii%20gx



    No just 2 wires:
    Main DB to the MPII's AC_in - it feeds the main DB / draw from the main DB on this one wire.
    MPII AC_out1 to the 2nd DB - because you have the Carlo Gavazzi, therefor you don't touch the AC_Out2. But why? I was under the impression that this is where the heavy loads must be connected to? Because this AC out is only live once grid power is available.

    Whole new kettle of fish you want to cook on the AC_out2 connected to the house. We don't do it here. Stick to the Carlo Gavazzi and nothing on AC_out2. Why why why? What am I missing?

    As a UPS, one that is moveable, to feed it power to recharge the batts, yes, put a plug on AC_in, the caravan ones, those blue ones.
    But I'm not sure that you can do that, and connect to a DB, and not permanently.
    Some UPS oak out there did a similar solution, just plug that UPS into any plug (feeds the entire house via that plug) ... it was dubbed a suicide plug UPS.



    100%.
    Nico Swart

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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by Die SwartKat View Post
    What then about the MultiPlus II GX? Will this one not have these two gizmos integrated? https://www.victronenergy.com/inverters-chargers/multiplus-ii%20gx
    Yes, you can, it is a MPII 3kva with a VenusGX built in.
    Exactly the same price as a MPII 3kva with a VenusGX bought separate.
    Only the 3kva GX is so far NRS listed ... 5kva may or may not appear.

    Quote Originally Posted by Die SwartKat View Post
    MPII AC_out1 to the 2nd DB - because you have the Carlo Gavazzi, therefor you don't touch the AC_Out2. But why? I was under the impression that this is where the heavy loads must be connected to? Because this AC out is only live once grid power is available.

    Whole new kettle of fish you want to cook on the AC_out2 connected to the house. We don't do it here. Stick to the Carlo Gavazzi and nothing on AC_out2. Why why why? What am I missing?
    I have written about this before, the kettle full of fish, let me rephrase:
    If you use AC_out1 (always on DB) and AC_out2 (the main DB), then your ENTIRE house runs off the inverter.
    So if your geyser (2kw), stove (4kw), microwave (2kw) and kettle (2kw) is on, then the inverter will switch off because it is 10kw draw, overloading it.

    So, how do you overcome that normal-stock-standard-on-all-inverters-limitation namely overloading it, and no massive rewiring of main DB?
    You don't use AC_out2 at all. Ever.

    BUT ... because you are not using AC_out2, the inverter has NO clue to calculated the total power going through it, what is fed back etc.
    So, how do you overcome that?
    1) You use a current sensor on the main DB, plugged into the MPII - current sensor being a few hundred rand cheaper than the Carlo.
    2) You use a Carlo Gavazzi, plugged into the VenusGX, the Carlo being installed in the main DB, and inverter knows exactly what is going on

    ... and you have a record of all the data on your main DB and 2nd Always On DB. No brainer in my mind, to go for the Carlo.

    AC_out2 is for small loads like say a caravan, a small housie with keenly managed loads -below the inverters max at all times - loads which must switch off when Eskom dies.
    Ignore it, forget it when grid tying a house.
    Last edited by the_terrible_triplett; 2020/06/22 at 05:55 PM.
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  21. #197
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by Die SwartKat View Post
    Additional info. The solar panels and batteries are at the garage. I would need to run about 40 meters of cable to the house to where the main db is. So the Victron also needs to be in the garage.
    Before I forget.
    VenusGX must be connected to the:
    MPPT - cable is short so VenusGX must be in garage also.
    Carlo Gavazzi - UTP cable 1 - <100m so it is ok, form main DB where it is installed, the the VenusGX.
    MPII - UTP cable 2 - VenusGX close to the inverter so no issue.
    Internet - UTP cable 3 - to where your router sits. Wifi is an option, but UTP cable is cheaper.
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  23. #198
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    Default Re: Solar System for Home ( yet another :)

    TTT you're going to get gatvol with me, sorry about that. I believe we're almost there.

    Quote Originally Posted by the_terrible_triplett View Post
    Yes, you can, it is a MPII 3kva with a VenusGX built in.
    Exactly the same price as a MPII 3kva with a VenusGX bought separate.
    Only the 3kva GX is so far NRS listed ... 5kva may or may not appear.

    This helps. I can then go for a Multi II GX 3Kva now in 48V, and then later if need be add another one. Because surely the there is a substantial price difference between the 3 and 5.

    I need to save where I can now, but would want to expand later once needs and funds allow.




    I have written about this before, the kettle full of fish, let me rephrase:
    If you use AC_out1 (always on DB) and AC_out2 (the main DB), then your ENTIRE house runs off the inverter.
    So if your geyser (2kw), stove (4kw), microwave (2kw) and kettle (2kw) is on, then the inverter will switch off because it is 10kw draw, overloading it.

    I don't get this. Please explain in as simple words as you can. Even simpler than you think please, (bearing in mind I am not clued up at all yet on how the wiring must be done)

    How my layman brain sees it, is that Eskom will supply ALL loads in the house, after those loads first took what they can from the solar panels.

    So, once Eskom fails, in my mind ALL heavy consumers must switch off simultaneously. Then only the light loads must be on batteries OR be powered directly from the solar array if the batteries are in a full SOC.

    That's why I understood that the heavy consumers must be on the AC2 outlet (which is only live whilst Eskom powers it)


    So, how do you overcome that normal-stock-standard-on-all-inverters-limitation namely overloading it, and no massive rewiring of main DB?
    You don't use AC_out2 at all. Ever. Why why why why? Why is this outlet so horrible?

    BUT ... because you are not using AC_out2, the inverter has NO clue to calculate the total power going through it, what is fed back etc.
    So, how do you overcome that?
    1) You use a current sensor on the main DB, plugged into the MPII - current sensor being a few hundred rand cheaper than the Carlo.
    2) You use a Carlo Gavazzi, plugged into the VenusGX, the Carlo being installed in the main DB, and inverter knows exactly what is going on

    ... and you have a record of all the data on your main DB and 2nd Always On DB. No brainer in my mind, to go for the Carlo.

    AC_out2 is for small loads like say a caravan, a small housie with keenly managed loads -below the inverters max at all times - loads which must switch off when Eskom dies. In my mind this must be the huge loads. What am I not getting? I have a amall housie with keenly managed loads.
    Ignore it, forget it when grid tying a house.
    Then one more thing please.

    I have been advised by someone in the industry that the VenusGX is going to be discontinued soon. So the Multiplus GX II seems the way to go.

    But this person also upon enquiry on the Carlo Gavazzi said the following. What do you make on this please as I'm not sure what this means:

    "Jy het net die meter nodig as jy grid parallel wil werk. Die nuwe Multi II het 'n CT input so die meter is oorbodig"


    Does this mean grid tied? And what is a CT input?
    Last edited by Die SwartKat; 2020/06/22 at 06:37 PM.
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by Die SwartKat View Post
    TTT you're going to get gatvol with me, sorry about that. I believe we're almost there.
    When the penny drops ... you can help.

    Quote Originally Posted by Die SwartKat View Post
    This helps. I can then go for a Multi II GX 3Kva now in 48V, and then later if need be add another one. Because surely the there is a substantial price difference between the 3 and 5.
    I need to save where I can now, but would want to expand later once needs and funds allow.
    100% - note for that day, when you expand, you don't buy a MPII GX ... you just get a plain MPII - because you already have the VenusGX built into the MKII GX.
    Personally I prefer the parts separate, as their is no price difference between 'n 3kva MPII with the VenusGX extra and a 3kva MPII GX, VenusGX built in.


    Quote Originally Posted by Die SwartKat View Post
    I have written about this before, the kettle full of fish, let me rephrase:
    If you use AC_out1 (always on DB) and AC_out2 (the main DB), then your ENTIRE house runs off the inverter.
    So if your geyser (2kw), stove (4kw), microwave (2kw) and kettle (2kw) is on, then the inverter will switch off because it is 10kw draw, overloading it.

    I don't get this. Please explain in as simple words as you can. Even simpler than you think please, (bearing in mind I am not clued up at all yet on how the wiring must be done)

    How my layman brain sees it, is that Eskom will supply ALL loads in the house, after those loads first took what they can from the solar panels.

    So, once Eskom fails, in my mind ALL heavy consumers must switch off simultaneously. Then only the light loads must be on batteries OR be powered directly from the solar array if the batteries are in a full SOC.
    That is 100% correct.

    The part I THINK you are missing, is that current does not flow from left to right or up to down ... nope, it goes to where it is used.

    That one main wire from the main DB to the MPII, the new 4/6/10mm one, lets talk about it.
    The main DB is already powered from Eskom right? Does not need the MPII at all. Eskom IS there already.
    At times the MPII will draw via that new new 4/6/10mm, power from the main DB to power what it shorts between the solar panels and the batteries, so that the 2nd DB keeps on being powered via on AC_out1.

    But WHEN there is a surplus from the panels, 2nd DB is powered, but the geyser needs more power, THEN the main DB will draw power from the AC_in from MPII, all the spare power it has, back to the main DB, on the SAME wire, the MPII gets Eskom power from.

    Does that make more sense?

    And because it can do that, it will feed the grid via your main DB UNLESS you put a stop to that i.e. the Carlo Gavazzi is installed, so that the MPII sees power being pushed back onto the grid, and it throttles the solar power down to try and keep a positive draw from Eskom like min 25w or 50w .. whatever you set it to draw min.

    Make sense now?


    Quote Originally Posted by Die SwartKat View Post
    normal-stock-standard-on-all-inverters-limitation namely overloading it, and no massive rewiring of main DB?
    You don't use AC_out2 at all. Ever. Why why why why? Why is this outlet so horrible?
    It is not ... a 5kva or 3kva inverter cannot power a house when the house draws more than the inverter capabilites. Not Victron, not GoodWE not even MLT.
    This outlet is 100% perfect for certain scenarios ... powering a house, nope.

    When the penny drops, it will make perfect sense!


    Quote Originally Posted by Die SwartKat View Post
    AC_out2 is for small loads like say a caravan, a small housie with keenly managed loads -below the inverters max at all times - loads which must switch off when Eskom dies. In my mind this must be the huge loads. What am I not getting? I have a amall housie with keenly managed loads.
    Correct!!! Your main DB, the one with the big loads, fed by Eskom, all goes off.
    Now, the AC_out1, the always on circuit, still powers the 2nd DB with either solar and batteries ... keeping it always on.

    The new 4/6/10mm cable is then dead, when Eskom is off. Clever relays inside the MPII ensures that.


    Quote Originally Posted by Die SwartKat View Post
    I have been advised by someone in the industry that the VenusGX is going to be discontinued soon. So the Multiplus GX II seems the way to go.

    But this person also upon enquiry on the Carlo Gavazzi said the following. What do you make on this please as I'm not sure what this means:
    "Jy het net die meter nodig as jy grid parallel wil werk. Die nuwe Multi II het 'n CT input so die meter is oorbodig"

    Does this mean grid tied? And what is a CT input?
    Yes ... we are talking taking you grid-tied.
    I mentioned the current sensor i.e."CT input", also said the Carlo gives you data via the VenusGX about your Eskom and inverter usage, the "CT Input" not so much.

    The VenusGX is not going to go away soon no.
    There is a new device out, which may have caused the rumour, and that is the Victron Octo GX, this one: https://www.victronenergy.com/panel-...x#pd-nav-image

    It is about R1100 more expensive then the VenusGX.
    VenusGX has 2 USB ports. One for the Carlo and one spare for a USB HUB.
    VenusGX 3 x Resistive tank level inputs, OCTO None
    VenusGX 2 x Temperature sense inputs, OCTO None
    VenusGX 5 x Digital Inputs, OCTO 3
    See here: https://www.victronenergy.com/live/venus-os:start
    Last edited by the_terrible_triplett; 2020/06/22 at 08:29 PM.
    Political Correctness
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    Saw this in a pub - no idea why the wife does not see it so:
    I'm not opinionated ... I'm just always right!

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  26. #200
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    Default Re: Solar System for Home ( yet another :)

    Quote Originally Posted by Die SwartKat View Post
    I believe we're almost there.
    Here is a picture I made for you of the connections.
    Attached Images Attached Images  
    Last edited by the_terrible_triplett; 2020/06/22 at 09:47 PM. Reason: Update Pic with cable from MPPT to VenusGX
    Political Correctness
    Political Correctness is a doctrine, fostered by a delusional illogical minority, rabidly promoted by a unscrupulous mainstream media which holds forth the proposition that it is entirely possible to pick up a turd ... by the clean end!

    Saw this in a pub - no idea why the wife does not see it so:
    I'm not opinionated ... I'm just always right!

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