Small Scale Offgrid Solar PV: Installation Manual
Discharge. The capacity of the batteries selected is slightly less than the optimal to minimize
costs. There are two options for the 100W solar panel. The option of two 90Ah batteries
provides an example of configuration in parallel.
Solar Panel
100W, 12V
Estimated optimal
battery capacity
188Ah
150W, 12V
150W, 24V
180W, 24V
235W, 30V
280Ah
140Ah
170Ah
225Ah
Batteries selected
(Surette Rolls 27 HT 90 [12V, 90Ah] x 2 in
parallel) o (1 x Trojan T175 [12V, 150Ah])
Trojan T145 [6V, 260Ah] x 2 in series
Trojan SCS225 [12V, 130Ah] x 2 in series
Trojan T1275[12V, 150Ah] x 2 in series
Victor 12V, 200Ah x 2 in series
Total Capacity
and voltage
(180Ah, 12V)
o (150Ah, 12V)
260Ah, 12V
130Ah, 24V
150Ah, 24V
200Ah, 24V
30