System design using XW-CC

Options
dsimonl
dsimonl Registered Users Posts: 6 ✭
in PV Installers Forum - NEC, Wiring, Installation #1
I am installing four SolarWorld 230W modules in a 12V nominal off-grid system using a Xantrex XW-CC.

I usually use the efficiency curves of the charge controller to determine input voltage, but that data is not published.

Would I be better off with all 4 modules in parallel (Vsc=36.9V) , or 2 strings of 2 (Vsc of 73.8V)?

Thanks!
· Share on Twitter

Comments

  • BB.
    BB. Super Moderators, Administrators Posts: 33,439 admin
    #2
    Options
    Re: System design using XW-CC

    Normally, you would be better off with the lower voltage--unless the panels are a long distance from the battery shed.

    You can use the voltage drop calculator to compare wire length vs gauge vs amperage (remember, for this calculator, the wire length is 2x the run).

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
    · Share on Twitter

Categories