Sizing for 3.5kWh/day

 System voltage 24 Volts
Battery Volts 2V
Daily load 3.5kWh
5 days autonomy
Battery bank capacity 1200Ah
Daily Depth of Discharge 13.5%
Array output required 180Ah/day
PV module output 5A
Garanteed current 4.5A
Number of modules in series 2
Number of parallel strings 9

  On Sep 13, 8:35 pm, beal...@gmail.com wrote:

George -
Can one assume that if we needed 70kwh/day, that we simply multiply
your numbers by 20?

 
Well, no. I checked it and it seems to work. But you would be better
served by multiplying by ten and doubling the system voltage to 48
volts.

But you have asked this before. Nothing has changed in the technology
to reduce the cost.

Although, according to the world foremost expert on load reduction,
yes that would be wayne, all you need is to use an electric battery
charger to reduce your load.

 
Speaking of  24V modules, are any of those convertible to 12V?

Cheers

 
This sizing was done using 75W 12V panels.

If you mean can your convert 24V panels to 12V some yes some no. It is
usually just a matter of where you connect to inside the Jbox on the
panel.