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jaffacake

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  1. Hi all We're are newly off the grid (I think it's almost 3 weeks now). I find that I have more questions as time goes by and can't always find clear answers! So if anyone has the patience to explain in technical terms of less than three syllables, here are a few of them ... The system comprises: 16 x 305W panels (4.8kW) 100W MPPT 5kW inverter 24 x 2V forklift batteries (either 640 or 720ah or something like that) One 4kW petrol generator I thought somehow it would be easy to read off a meter or a monitor to etermine the state of charge of the batteries, but the value on the MPPT never makes any sense to me. After a good charge, the value will be 58.4V. Then the machine goes into a float cycle and the figure drops to 49V by bedtime, even if we're drawing little power. Why? I was told to start the generator if the reading fell to 46. This week after many cloudy days it fell to 46.7, so I started the generator (which is wired into the inverter), but an hour later the reading had dropped to 46.5. When I stopped the generator and checked 30 minutes later, the reading was 57.7. Does it just take a while to reflect the increase ? How long should a generator run to do a meaningful recharge? If I wanted to not use more than 80% of the battery capacity, how do I determine that from reading the MPPT? Thanks a mill Sally Mossel Bay
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