Quote Originally Posted by offgrid View Post
48 volt system. The advantage to 48 over 24 is lower current, smaller gauge wire $, single series string of batteries.

1180 AH battery bank, 24-2volt cells. A nominal 50V's x 1180 = 59, 000 watts capacity. We use about 8 KW's a day. Battery bank gives us 3 day storage discharging down to 50%. Very rare to go 3 days w/o sun or wind.


This is always the best way to build a battery bank for sure, as differences in battery internal resistance can cause havoc in larger Parallel Strings of batteries.

48 volts is a good battery bank voltage for wind turbine systems, with long cable runs out to the tower.

In larger electrical substations they use a 125-130Vdc battery system consisting of a large string of batteries that is center grounded for so if you touch a wire it is only + or - 65 VDC with respect to ground.


I have a high voltage dc grid tied solar system all planned out, when I have the money...