had a pm requesting to know more about my off grid system so here are a couple of pics . DSCN8083[1].JPGDSCN8084[1].JPG
the 7 panels i picked up used for $950au they are 250w each. so 1750w array, the 2 charge controllers are pwm 30amp $40au each off ebay 4 x 75ah marine batteries $700au 2 x 100ah deep cycle batteries $470au they are arranged in series, 2 banks of parallel with 2 marine and one deep cycle. the series banks are matched at 250ah 24v. 4 panels are in parallel to one charge controller the other 3 panels in parallel to the other charge controller. these are connected via 25amp cable at 10meters. 2 lengths at 10meters each to each charge controller. i get 20amps off the charge controller with the 4 panels and 15amps off the charge controller with the 3 panels. so about 35amps in total. so the battery bank is over paneled, i figure im losing about 600w through the cabling but still getting 1000w into the batteries which is plenty. the alternative would be a $1000 mppt charge controller to get 1700w but not worth the expense. could get another 7 panels for $1000 and more than 1700w with pwm charge controllers. the batteries never go below 75%soc and i run a fridge, washing machine ,coffee machine,computers, lights, tv, power tools. the inverter is a 24v 2000w for $360au. so total cost to set up was about $2500au. i know you should use the same batteries in a bank but i balanced the series banks. the parallel banks can be unmatched as the current still flows through the batteries in the parallel banks till they are all charged.
the 7 panels i picked up used for $950au they are 250w each. so 1750w array, the 2 charge controllers are pwm 30amp $40au each off ebay 4 x 75ah marine batteries $700au 2 x 100ah deep cycle batteries $470au they are arranged in series, 2 banks of parallel with 2 marine and one deep cycle. the series banks are matched at 250ah 24v. 4 panels are in parallel to one charge controller the other 3 panels in parallel to the other charge controller. these are connected via 25amp cable at 10meters. 2 lengths at 10meters each to each charge controller. i get 20amps off the charge controller with the 4 panels and 15amps off the charge controller with the 3 panels. so about 35amps in total. so the battery bank is over paneled, i figure im losing about 600w through the cabling but still getting 1000w into the batteries which is plenty. the alternative would be a $1000 mppt charge controller to get 1700w but not worth the expense. could get another 7 panels for $1000 and more than 1700w with pwm charge controllers. the batteries never go below 75%soc and i run a fridge, washing machine ,coffee machine,computers, lights, tv, power tools. the inverter is a 24v 2000w for $360au. so total cost to set up was about $2500au. i know you should use the same batteries in a bank but i balanced the series banks. the parallel banks can be unmatched as the current still flows through the batteries in the parallel banks till they are all charged.
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