My off grid water pump progression, advice or thoughts?
I have a 24 volt system, 12 Trojan L16 batteries. When I got the property with no solar, the house had a Grundfoss pressure pump. Water storage tank is about 5 feet above house level. Pump pulls about 10 amps AC. After I built the solar system I wanted to have a lower power usage pump and a friend who has been off grid for years recommended a 12 volt Remco 55 Aquajet-ARV. He told me to pick out two batteries in my bank and use them for the the 12 volts. Pump works amazing and keeps up with water usage and pressure perfectly, but was drawing those two batteries down significantly lower than the rest. Specific gravity was down to 1.200 on those two. I removed that pump and reinstalled the Grundfoss. After some researching I see where Remco makes a 24 volt version of this pump, still over 5 gpm, which would allow me to draw from the entire battery bank. I also researched DC to AC amperage comparisons and found a chart that showed to pull 10 amps AC required about 50 amps DC accounting for inverter loss and such. I would like to buy the Remco 24 volt pump as it pulls 10 amps DC at 60 psi, its shutoff pressure. Is my research correct? Any opinions would be greatly appreciated.