Step by Step guide for DIY hybrid inverter with gennie backup installation - please p





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  1. #1
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    Default Step by Step guide for DIY hybrid inverter with gennie backup installation - please p

    I’ve asked a couple of questions, now decided what I need / want.

    However, the quotes coming in is just too much for my budget, therefor it will have to be DIY, and then getting qualified person for the COC.

    Im no expert, and fortunately dont have to left hands or 5 thumbs ... however dont want to electrocute myself or burn down the house. But cant find any good step by step guides to show me how/what to do.

    System: hybrid inverter (will only do panels later) with couple of batteries + small gennie as backup with long LS periods if batteries doesn’t last.

    Please help - it would appear my googling skills are not as good as I thought ...

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Quote Originally Posted by Jacques Joubert View Post

    System: hybrid inverter (will only do panels later) with couple of batteries + small gennie as backup with long LS periods if batteries doesn’t last.

    Please help - it would appear my googling skills are not as good as I thought ...
    For a start just give more details an what inverter and model you are going to install. Also what batteries are you using. This will help to guide you.

    Also are you going to use a transfer switch between genny and inverter and grid and inverter.

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    If you are going to just run Dstv and TV, then buy yourself one of those 24v mercer modified sine wave inverters. You plug Mains into inverter unit and TV, dstv, light in output side. When the Mains fail it automatically switches over onto the battery power. If batteries go flat, you just plug inverter into generator. The mercer inverter chargers batteries when Mains is restored.
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Not all inverters are happy with just any generator input, my Axpert won't take charge from my 7.5kVA Adendorf genny. Its frequency seems to be 0.5Hz of from 50, not sure if that is the problem, but have not really needed it.

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Let me give a bit more info on the plan:

    3KVA - dont know which one yet, will have to see what is currently available in the market - open to suggestions

    Would like batteries / backup to kick in automatically when LS starts

    Not planning solar panels now, but definitely in about year or two

    24V system (48V setup just too expensive)

    4x 12V batteries

    Gennie with changeover switch to power house when batteries run flat. Not planning to charge the batteries with gennie

    Dont want to run stove / aircons / heat pump

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Grid tied inverter which accepts genny input. Much easier than switching over whole house to genny.
    48V system (not sure why you say too expensive)
    You are stating 4 batteries anyway. Configure 48V

    @Ekkekan & @TTT can advise better regarding inverter, Goodwe or Solis or Victron
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    I still like a Solis mini 4G for grid tied coupled to a Axpert and like the bigger Axpert that one can extent to a 2nd one if needs be. The 4kVA and 5kVA can run in //. After this 2 inverter setup which I like so that the whole system is not out of order if 1 inverter fails I would look at the Solis RHI-3K-48ES or 3.6K or 5K which are true hybrids or the Goodwe ES 3.7 or 5kW units. Getting the right Victron is also a good call.

    Just be careful if you have prepaid as some grid tied does export a bit before throttling back and could trip grid power.

    I would also go the Lithium 48V rather than 4x12V lead acid.

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Quote Originally Posted by Prof View Post
    48V system (not sure why you say too expensive)
    Apologies ... got my facts wrong here

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Did some googling just now - and this is what the interwebs spits out ...

    Click image for larger version. 

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    Not all are in stock ... and only 3x 48V units.
    So would the recommendation be to go for the RCT Axpert MKS 3KVA/3KW 48V Solar Inverter (https://thepowerstore.co.za/collecti...solar-inverter)
    Last edited by Jacques Joubert; 2020/05/02 at 11:38 AM.

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    The 3kW cannot be expanded with a 2nd one and a bit small to be the one and only. Rather spend a bit more for the 4kW unit and also buy the PCB that allows you to run 2 units at some time in the future. Only the 4 and 5kW can run in //.

    www.geewiz.co.za do have the 5kVA as well as // kit in stock and ready to deliver.
    Last edited by ekkekan; 2020/05/02 at 01:09 PM.

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Quote Originally Posted by ekkekan View Post
    The 3kW cannot be expanded with a 2nd one and a bit small to be the one and only. Rather spend a bit more for the 4kW unit and also buy the PCB that allows you to run 2 units at some time in the future. Only the 4 and 5kW can run in //.

    www.geewiz.co.za do have the 5kVA as well as // kit in stock and ready to deliver.
    Baie dankie,

    Really good advise and if it wasn’t for a tight budget - I wouldn’t think twice.

    Dont think I need more than 3kva for normal daily use, but 5kva would be able to handle almost everything. Also dont think I will need more than 1 unit necesarily.

    With a 3kva unit, I was thinking that I would need to “split” the DB, or wire 3kva unit just to essential circuits. I guess the 5kva unit can be connected directly to DB.

    Is my logic sound? And would this provide a cost saving to justify the 5kva unit? And is it straight forward for even me to connect to DB?




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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Due to the many circuits in your DB I would reduce MCB's and add a conatactor to switch the stove and geysere off during LS and add everything on a 5kW. Otherwise a change in lifestyle not to use the stove during LS. Add a say small 3W LED downlight in the passage to indicate that the grid is on otherwise one might not know the grid is off and discharge the battery specially during a power failure than LS when we normally have a time table to know when the power will be off.

    It is also due to the "wasted" money that one would go for cheaper batteries than Lithium and having to replace after a few years.

    Budget can be a problem but a lot of times one wastes money and that for a saving of R3000 between say a 3kW and 5kW unit. The classical trap in solar. Then I would delay installing the system for a month or 2. But on the other hand if a supplier has old stock it would be at a lower price than new stock with the Rand at R19/$. Buying from lithiumbatteriessa.co.za say loose cells and a BMS is a good way of reducing lithium cost.

    Current prices in China are up to 30% more expensive now vs 6 weeks ago.

    It is up to you to call the shots on how you will be using the system.

  14. #13
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Looking the price of the Axperts, me, I would do two things:
    1) Check ones local SSEG regulations.
    2) Then "invest" in an approved NRS inverter.

    Axperts and DB's are only allowed as a off-grid setup IF you connect panels to the Axpert. If not, it is just a UPS install.

    Going for a grid tied setup - WHERE YOU SAVE ON YOUR ESKOM BILL:
    You have Solis and Axpert as Ekkekan suggested.
    Then you have 5kva GoodWE's.
    Solis and GoodWE's are limited ito array when grid tied based on main circuit breaker. Check SSEG regulations first.

    Me, I prefer Victron. In this case a MPII 3kva grid tied. Why:
    1) You are not limited ito array size, as the 3kva is the limit already, so you can add larger than 3.5kw array.
    2) If you take a 5kva inverter, the software limiting with Victron is acceptable, which falls away when the grid is off by the way, so you can go larger array on it too.

    So, to sum up:
    1) A Victron MPII 3kva is about +-15k - it is approved and it can be grid tied.
    2) IF ever you want, you can add up to 6 in parallel ... if you need.
    3) Install it as a UPS at first.
    4) When funds allow, buy the next parts needed as you see fit - LEGO - expanding it one block at a time.

    And the DB:
    Take the circuits you want to power from batteries out of the main DB into a 2nd surface mounted DB.
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Morning,

    Thanks for the advise - went digging & found this list, and a crapload of forms to complete ... :

    Click image for larger version. 

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Quote Originally Posted by Jacques Joubert View Post
    Thanks for the advise - went digging & found this list, and a crapload of forms to complete ... :
    Only a pleasure.

    CPT forms was intimidating ... till they where not. Once the penny drops, it is easy as pie ... in Cpt that is.

    Must say, during the whole process to get grid connected, it turned out that the house earth has been faulty since the house was built 25+ years back.

    Inverter kept tripping when syncing back to the grid when tested / after a power failure.

    Because of the application and test the sparky had to do, before the engineer arrived, that was what brought that little "gem" to the forefront ... and expense we did not anticipate.

    The engineer costs where R 2 500 ... as I threw a "vloermoer" (temper tantrum) when I was quoted originally R10k+ for a engineer signoff. Was early days back then but still.

    Takes engineer +-15min to double check the sparkies work to sign off, with even MORE paperwork and a lot of photos.
    So it is a good idea, IF a engineer must be involved, that engineer and sparkie are constantly in contact during the install.
    Political Correctness
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    I fall under agri rural so Tshwane drops a 3-phase link down a pole and the rest is my problem.

    Thank goodness, because my local muni is actually Madibeng and they wouldn't know a circuit breaker from a water tap.

    So I'm keen to see how a DIY system can be done.
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Tshwane is also known for swapping a life and neutral when replacing stolen/damaged cables.

    It blows chargers out of wall plugs, blow up sidewalk transformers and your inverter if you are not lucky

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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Quote Originally Posted by faniedup View Post
    Tshwane is also known for swapping a life and neutral when replacing stolen/damaged cables.

    It blows chargers out of wall plugs, blow up sidewalk transformers and your inverter if you are not lucky
    If they blow my 3ph transformer there will be hell to pay but luckily I got a new one at the beginning of the year 'cos the old one hadn't been serviced in over 20 years and wouldn't push more than 340vAC. And strangely my 220vAC appliances didn't like 190v 1ph much.
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Quote Originally Posted by jelo View Post
    ........ the old one hadn't been serviced in over 20 years and wouldn't push more than 340vAC.
    Interesting - I did not know that.
    I wonder how servicing a transformer can change the voltage?
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    Default Re: Step by Step guide for DIY hybrid inverter with gennie backup installation - plea

    Quote Originally Posted by PRA View Post
    Interesting - I did not know that.
    I wonder how servicing a transformer can change the voltage?
    who knows, all I know is that mine was stuffed

    something about breakdown voltage
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