pv.block18.net is an off-grid solar PV system building tool. The tool allows you to enter load details, and then configure a PV panel array and battery bank to suit. There are built-in capacity checks, as well as hints for breaker / disconnect / wire sizing.
Create an account to start building!
Code running the system builder on this site can be found here: https://github.com/rolandwells/pvapp/
Comments are welcome, contact me.