Of course, the MPPT makes the PV array behave like a larger array, but that's comparing MPPT to non- MPPT, I thought you were comparing PV to a regular AC charger.
R. Walters r...@solarray.com Solar Engineer On Mar 25, 2010, at 4:40 AM, drake.chamber...@redwoodalliance.org wrote: > My understanding is that the voltage, in excess of battery voltage, from > the array, represents energy that is dissipated as heat in the batteries. > This extra voltage, multiplied by the amperage is wattage. This extra > power can produce more amps at a reduced voltage. It is amperage that > charges the battery. > > Thanks, > > Drake > >> MPPT doesn't really do that much for the battery, it just makes the PV >> modules more effective. >> The real magic is: >> A) the 3 stage charging (compared to traditional single stage AC chargers) >> B) Temperature compensation >> C) PWM that helps pulse off sulfation >> D) Slower charge rates let batteries charge more fully without damage from >> overheating. >> >> R. Walters >> r...@solarray.com >> Solar Engineer >> >> >> >> >> On Mar 24, 2010, at 7:04 PM, drake.chamber...@redwoodalliance.org wrote: >> >>> Can anyone tell me why PV is considered an excellent battery charger? I >>> think it is, only after the addition of a MPPT charge control. >>> Otherwise, >>> the battery drags the PV voltage below Vmp. >>> >>> One of the NABCEP objectives for the entry level class is to explain why >>> PV modules make excellent battery chargers and show this through the IV >>> curve. >>> >>> Thank you, >>> >>> Drake >>> >>> _______________________________________________ >>> List sponsored by Home Power magazine >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Options & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out participant bios: >>> www.members.re-wrenches.org >>> >>> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> >> > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org