MPPT solar controller

System
System Posts: 2,511 admin
in Solar Beginners Corner #1
If we use 120W power panel, 16.9 V and 7.1A . our battery condition is 10.5 V than how much the controller produce current. Is this formula held good. 120=A x 10.5, that is A=11.42
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  • icarus
    icarus Solar Expert Posts: 5,436 ✭✭✭✭
    #2
    Re: MPPT solar controller

    The formula is correct, but I don't think that you will see that much MPPT gain in the real world. With low batteries, AND low PV temps, you might see 15-20% increase,,, less as the battery gets higher, and the panel temps increase.

    In my system,, with battery voltage ~12.4volts, and cold morning temps,, I see about a 15% increase.

    Tony
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  • niel
    niel Solar Expert Posts: 10,300 ✭✭✭✭
    #3
    Re: MPPT solar controller

    depending on the amount of sun you are seeing you will probably get up to 7.1a unless you are using an mppt controller and under the circumstance of being 100% depleted it could deliver around 20-30% more current give or take. 10.5v is a dead battery and is 100% dod, not to be confused with doa, but keep draining it that far and it soon will be.
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