the more you draw from the batt bank the faster they fail. you will have to decied which loads you want to be backed up by batt (lights refridgeration) and detrmine how many watts those loads require then size the bank accordingly. you will want an off grid inverter connected directly to the pannels otherwise in the event of grid failure you will be relying on diesel to charge the bank the solar will do nothing as it has a grid tied inv
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2 ton geo unit 2400' HDPE slinkey
4KW solar with battery backup
$8.98 power bill
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