Battery System Voltages and equivalent power Because this is one
of the issues that's asked about repeatedly (in different ways)
I thought I'd just outline the basics here for reference. For
comparative purposes, this example uses eight "golf cart"
batteries of 220 Amp hours and 6 Volts, or 1320 Watt hours (DC)
each. Times eight that is a battery bank capacity of 10,560 Watt
hours, up to 50% of which would be "usable" for 5,280wh. We will
also assume a 10% charge rate (the array sizes would be equal),
1200 Watt load, and standardization of other factors (including
ignoring losses) because the point here is to relate the
differences between the three normal system Voltages: 12, 24,
and 48. First, the 12 Volt system: This would be four parallel
strings of two batteries in series. That's 880 Amp hours @ 12
Volts. Charge rate: 88 Amps, necessitating either a MidNite
Classic controller or two other types of MPPT controllers to
handle the current or at least 2 PWM controllers without the
efficiency of going MPPT if