CatEyes

Deye and Volta have come to a co-branding agreement where they are offering a limited warranty of eleven years on the Inverter and battery combinations. My question is are the Volta batteries worth considering or am I better off sticking to other brands instead of going for the limited carrot? Thanks Deye-VOLTA - Warranty Certificate.pdf

Wasn't aware that Pylontech was 0.5C batteries, well perhaps not all of them. I'll make sure to check the specifications.

I suspect he means there's a lot more cabling that goes into it to connect all three of them together.

As @Beat mentioned one of the reasons for building one system is the redundancy. If one inverter goes everyone still has some electricity albeit less but no-one is sitting in the dark. The other advantage is that the main house has a huge North facing roof whilst the rest have East and West facing. @GreenFields I will definitely have a look at the Greenrich 1.5C batteries This is for three households so at least there are three pockets to pay for all of this. @Moffat I was leaning towards the BSL batteries but I am also considering the Pylontech, Greenrich and FreedomWon batteries and will add more as time goes on.

Never thought about that.

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I haven't mentioned batteries since I only wanted to find out about the inverter sizing. Adding additional batteries and panels later is always an option since someone will find a use for the extra capacity but having to buy an additional inverter just because you spec'd the system 1kW too small for every time grandma makes a cup of tea is going to be expensive.

It will only be 12kW peak for a few minutes, not the total daily consumption. The average daily consumption is quite low at 9kW per day for household 1 which includes a geyser. A large portion of this minus the geyser will obviously be supplied directly by the solar panels and won't need to come from the batteries since you will only run the washing machine and other heavy appliances during sunny days. Unfortunately the current layout of the buildings don't allow for separate units and if 2x 5.5kVA units will suffice then why buy three inverters? This also causes the problem of excess energy being available but at the wrong place (PV / batteries). But this is not the question here. Maybe I should rephrase my question. Considering the aforementioned peak household consumption. If it is a bright and sunny day and I have more than enough PV but no grid supply; what size inverter would I require to enable me to use all of my PV without the inverter tripping since it can't boost from the grid?

We have three households on the property and I would like to find out what size inverter would be recommended to be able to handle the peak consumption during load-shedding or as a completely off-grid system? The system will be grid-tied but unfortunately during load-shedding the inverter won't be able to boost the output by pulling electricity from the grid so it needs to be able to supply 100% of the peak consumption even if only for a short while. Household 1: House with 4 people Household 2: House with 4 people Household 3: Flat-let with 2 people The stoves are gas and the geysers will run either on-grid or from solar if there is excess power available. There are no air-conditioners or large pumps. The current maximum household consumption bursts are as following Household 1: 7000W (Kettle, Microwave & Hair dryer) Household 2: 4300W (Kettle & Washing machine) Household 3: 3500W (Kettle & Microwave) But all of the households will obviously not be consuming their maximum at the same time but they might also add something extra to the mix. By my guestimate (75% of the peak) we would require 12kW to be able to handle the peak consumption even if only for a short while but that is where my question lies. Will 2x 5.5kVA SunSynk inverters suffice or should I rather consider 3x 5.5kVA or 2x 8kVA units? 16 kVA is a lot of power and might be a bit excessive. Thanks