Is the maximum kWh one can run off the batteries tied to Inverter size
Hi I am just in the process of deciding what kit to use. I do not have any Solar and my intention is to install 4 x 5.12KW batteries to charge on Octopus Go for 4 hours Off peak each day and I was originally thinking of a 5KW inverter that would enable me to charge the batteries to full and then discharge during On peak which would match my average On peak consumption of 20KW. Is it true that the maximum draw off during the day would be 5KW max and if I installed an 8KW inverter I could pull down 8KW at any one time to run a hob and an oven at the same time. Please make allowance for my ignorance if I am talking jibirish 😓
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Well normally you measure the total run from the inverter, through the batteries and back to the inverter again in meters because they would all be acting as separate modules to make you battery pack up I assume - then work out the maximum current and make a decision on the mm2 cable size to suit. I assume there is documentation from the battery people giving cross section size requirements for certain lengths. Obviously as with all these things the shorter the lengths the better As an example a generic 35mm2 battery cable has a nominal amp rating of 250amps. But we’re saying that your 5 batteries together could have a nominal output of 500amps or so ( 5 batteries - 90amps or so each @ 50v ) Not sure what I would suggest here. The pre made cables that you see for these battery manufacturers don’t look larger than 35mm2 - they could be super duper cables that have higher nominal amp ratings though I assume