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  1. #21
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    Default Re: Home solar setup advise

    Quote Originally Posted by Uys View Post
    When I started with this my db was more or less 40 years old - you can imagine what that looks like. Luckily for me, the db is in the garage and I had a 3 row surface mount db installed over the original. This allows me a lot of freedom in moving loads around.

    Row 1:
    Incoming power form municipality through the main switch. Then the Earth leakage distributing power to circuit breakers. Here I have most plugs, the stove and oven, pool pump etc. From this row I then feed my hybrid inverter. 5kVA Axpert.

    Row 2:
    Incoming power from the inverter - whether from 220V straight through the inverter, batteries or solar, passing through another main switch and earth leakage. Then all the loads. In case lights, office power (for computers, wifi etc) and now also the fridge and my borehole pump.

    Row 3:

    A generator switch - but not for a generator - it switches row 2 between the inverter or municipal supply. This way, if my inverter goes down , break or get stolen - I can bypass it safely and get my house back and running with one switch.


    With this setup I can remove a circuit breaker from row one, move it into row 2 and it is immediately on the inverter system. So as I expand my system I can put more load on the inverter. I got 4 x 365 , 48V panels from a friend recently and are now considering to put the pool pump on the inverter and run it only during the day.


    Attachment 558213
    The other day the guy at deltec informed me that my axpert couldnt connect to solar and grid. So its not hybrid as everyone makes it out to be.
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  2. #22
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    Default Re: Home solar setup advise

    Quote Originally Posted by Prof View Post
    Video @ekkekan is referring to

    This is my setup, without the grid tied inverter. What grid tied inverter should I get that doesnt cost more than my existing system? Only then will I add solar to the mix.
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  3. #23
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    Default Re: Home solar setup advise

    Quote Originally Posted by LandyLove View Post
    What grid tied inverter should I get that doesnt cost more than my existing system? Only then will I add solar to the mix.
    Some time ago I suggested you just add the Solis to your mix. Use the very same Solis as per this video. It cost less than half what your current system cost.

    R7550 for a 3kW Solis and as easy as can be to add to any installation.

    Some comments about the 2 inverter setups vs the Goodwe.
    1. A friend of mine has such a system installed more than a year ago. Just watch the export as it could easily export if a biggish Solis is used. Also pre-paid might switch off with export.
    2. Previous comments were can it work? Greenpro consulting would not advise it if it cannot work.
    3. I doubt that Fluffy would on a regular basis provide the link to this video if it is a scrap way of doing solar.

    In order to use my configuration with the Solis being able to work on a 60-600V input from solar one must just ensure you don't exceed the Axpert PV input with respect to the 150V input limit. This would then mean that the 35-40V panels there can't be more than 3 in series per string.

    As the inverters would just be getting a PV input they will not even know about the 2nd inverter as the Solis would be off line when the grid is off just like it is doing during the night with no PV input.

    Lastly the old style DC type of knife switch use on DC filed coils and main supply to motors means a very cheap method can be use to switch the DC as this switch opens about 40mm between the 2 sources of DC. Never will there be a problem. It is possible that a number of people have never seen these switches. See 6 pictures below.

    If I do miss something with this configuration please lets talk about it so I can also learn about the pot holes with my line of thinking.

    Configuration as per the video but without the actual transfer switch.
    Click image for larger version. 

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    Pics when operating. Cannot load videos - too old to learn
    Click image for larger version. 

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    Just some background to my way of going the 2 inverter route. I started working in an area where a lot of dual contingency is used. One part in operation with a second as stand by. When there is a problem you just switch over to the next and REPAIR the 1st. The current generation seems to be switching over to the stand by and not repairing the 1st. Should the 2nd fail then it is decided which one is less work while the whole system is out of order. Thus using 2 inverters means only half of your functionality is lost when 1 has to be removed to be repaired.
    Last edited by ekkekan; 2020/02/16 at 10:47 AM.

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  5. #24
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    Default Re: Home solar setup advise

    Quote Originally Posted by SchyffS View Post
    Same story, is this what the install looks like?
    From various posts it would be nice if for once and for all clarification to know if your grid tied from the King 1 on the left would be able to supply the 220V from the grid and panels as a proper grid tied would do. Solis in the comments from my side as it is the inverter I have and know a bit about it's operation.

  6. #25
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    Default Re: Home solar setup advise

    Also had a hybrid system installed end of Jan this year.

    It dropped my daily consumption from 32kw to about 10kw. It is also upgradeable (parallel mode)

    Does not feed to grid. Have one plug connected to grid only for Pre-paid.

    Also running solar Geyser.

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    Last edited by Predator; 2020/02/16 at 12:14 PM.
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  8. #26
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    Default Re: Home solar setup advise

    Quote Originally Posted by LandyLove View Post
    The other day the guy at deltec informed me that my axpert couldnt connect to solar and grid. So its not hybrid as everyone makes it out to be.

    It definitely connects to both.
    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

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  10. #27
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    Default Re: Home solar setup advise

    Quote Originally Posted by SchyffS View Post
    Decided to make a ‘drawing’ of what you explained to be sure I do understand. Please verify:

    Almost, just the small change at the bottom right. The 3rd row selects my supply source to row 2.

    Click image for larger version. 

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    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

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  12. #28
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    Default Re: Home solar setup advise

    Thanks ekkekan, Solis is the word I was looking for. Will certainly be looking into that.

    I cant find a 3kv one for R7550 though. Maybe my bargain hunting skills are a bit off.
    Last edited by LandyLove; 2020/02/17 at 06:39 AM. Reason: Added text
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  14. #29
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    Default Re: Home solar setup advise

    Quote Originally Posted by Uys View Post
    It definitely connects to both.
    Would you mind posting a picture of your inverters info display please?

    I was told that you cant connect to grid and solar at the same time, and I cant find the setting for it either. Its either grid, then its basically a UPS. Or its solar, meaning you have to cycle your batteries, also requiring a lot more batteries and solar panels than what I actually need.
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  16. #30
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    Default Re: Home solar setup advise

    Quote Originally Posted by LandyLove View Post
    Would you mind posting a picture of your inverters info display please?

    I was told that you cant connect to grid and solar at the same time, and I cant find the setting for it either. Its either grid, then its basically a UPS. Or its solar, meaning you have to cycle your batteries, also requiring a lot more batteries and solar panels than what I actually need.

    Sorry man, I am in Malaysia until March.
    Everything is a hammer.
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  17. #31
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    Default Re: Home solar setup advise

    Quote Originally Posted by Predator View Post
    Also had a hybrid system installed end of Jan this year.

    It dropped my daily consumption from 32kw to about 10kw. It is also upgradeable (parallel mode)

    Does not feed to grid. Have one plug connected to grid only for Pre-paid.

    Also running solar Geyser.

    system for those that is interested:

    1x5KW 48V Kodak VM III - wide input range
    *fully automatic operation - bi BMS
    Hi, does the Kodak VM III mix your energy like a true hybrid?
    Looks like a fantastic system.

  18. #32
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    Default Re: Home solar setup advise

    Last edited by Prof; 2020/02/17 at 08:08 AM.
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  20. #33
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    Default Home solar setup advise

    Quote Originally Posted by ekkekan View Post
    Some time ago I suggested you just add the Solis to your mix. Use the very same Solis as per this video. It cost less than half what your current system cost.

    R7550 for a 3kW Solis and as easy as can be to add to any installation.

    As the inverters would just be getting a PV input they will not even know about the 2nd inverter as the Solis would be off line when the grid is off just like it is doing during the night with no PV input.

    Configuration as per the video but without the actual transfer switch.
    Click image for larger version. 

Name:	solis-axpert-together.jpg 
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ID:	558327

    Pics when operating. Cannot load videos - too old to learn
    This is the method I am also interested in, and the cost can be spread over a period that is manageable.

    Which solis model would this be?
    Last edited by SchyffS; 2020/02/17 at 04:28 PM.

  21. #34
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    Default Re: Home solar setup advise

    Quote Originally Posted by Uys View Post
    Sorry man, I am in Malaysia until March.
    OT
    That explains it. Thought you had developed insomnia

  22. #35
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    Default Re: Home solar setup advise

    Quote Originally Posted by Uys View Post
    Sorry man, I am in Malaysia until March.
    No problem. March is fine. Im not running out to buy anything just yet.
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  23. #36
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    Default Re: Home solar setup advise

    Quote Originally Posted by Predator View Post
    Also had a hybrid system installed end of Jan this year.

    It is also upgradeable (parallel mode)

    Does not feed to grid. Have one plug connected to grid only for Pre-paid.

    1x 5KW 48V Kodak VM III - wide input range
    Hi, every website that I searched for this model (5KW 48V Kodak VM III) says its an OFF-GRID non parralel inverter. Are you sure this inverter can mix energy?
    Last edited by SchyffS; 2020/02/17 at 09:00 PM.

  24. #37
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    Default Re: Home solar setup advise

    I have come to the conclusion that the Axpert inverters are not hybrid (do not mix energy), none of them (Axpert, Axpert II, KS, MKS, MKS II, VM III & KING).
    To be precise:
    1. They are off-grid
    2. do not mix energy
    3. switches between utility (grid) and PV to meet the load demand, no mixing
    4. charges the batteries
    5. operates as a UPS when there a loss of PV solar and utility (grid).

    Adding a Solis to a setup using anyone of the Axperts could add a 'hybrid' function as the Solis can mix energy. In this instance the Solis will mix utility and PV to meet the demand. Im still not sure which Solis model this is as @ekkekan has not provided the full model name and number yet. Need confirmation about this specific statement.

    Next questions if the above statment is true:
    1. what other inverter combinations are similar to a Solis/Axpert combo?
    2. What additional features would such a combo bring?
    3. And which combo gives you the best value for money? and still cost less than a true hybrid...
    4. Which Axpert model inveretr is best suitable for the Solis/Axpert combo?

    Removing the Solis from the equation and using only an Axpert off-grid inverter:
    5. which Axpert can prioritise supply during the day when the PV power(set as priority) is less then the load to:
    a. continue to provide PV solar to charge the batteries, and
    b. provide utility power to the loads

    6. which Axpert can, during the night (no PV available), set battery as the main supply and switch to utility supply when the battery power is less than the load.

    Or am i getting ahead of myself.

    The Goodwe hybrid can not parralel.....this is a turn off.
    Last edited by SchyffS; 2020/02/17 at 08:59 PM.

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  26. #38
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    Default Re: Home solar setup advise

    Quote Originally Posted by SchyffS View Post
    6. which Axpert can, during the night (no PV available), set battery as the main supply and switch to utility supply when the battery power is less than the load.
    You need software to do that called ICC with a BMV IF I recall correctly that switches the Axpert back to grid once a certain SOC has been reached.

    What happens when Eskom goes off after the SOC has been reached, I don't know if the Axpert will override the ICC software and start using batteries again.

    Solis + Axpert is a good choice.
    Me, I prefer Victron. Modular, can parallel just like Lego, and it is a true hybrid with some super awesome opensource software.
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  28. #39
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    Default Re: Home solar setup advise

    Quote Originally Posted by SchyffS View Post

    Adding a Solis to a setup using anyone of the Axperts could add a 'hybrid' function as the Solis can mix energy. In this instance the Solis will mix utility and PV to meet the demand. Im still not sure which Solis model this is as @ekkekan has not provided the full model name and number yet. Need confirmation about this specific statement.
    Sorry for taking so long to answer - one can also google for Solis mini 4G.

    Here one can find information about the Solis true hybrid as an option against the Goodwe. Only 1 model on offer.
    https://www.sustainable.co.za/solis-...dc-switch.html

    Here is the full list of the pure grid tied inverters that meet a good standard.

    https://re-volt.co.za/Store/index.php?route=product/category&path=83_59_67




    Last edited by ekkekan; 2020/02/17 at 10:27 PM.

  29. #40
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    Default Re: Home solar setup advise

    Quote Originally Posted by SchyffS View Post
    Hi, every website that I searched for this model (5KW 48V Kodak VM III) says its an OFF-GRID non parralel inverter. Are you sure this inverter can mix energy?

    Hi here is a diagram of how this inverter operates:
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