Correct absorption charge for an AGM 48v battery array at freezing is around 61v. (15.3v per 12v battery) On Oct 2, 2014 8:16 PM, "Sean Heskett via Af" <af@afmug.com> wrote:
> I think it might be because it's cold here now and the charger compensates > for battery temp. > > I'll check the controller manual again tho because I thought that voltage was > high too. > > > > On Thursday, October 2, 2014, Eric Kuhnke via Af <af@afmug.com> wrote: > >> 60V seems high, copied verbatim from the datasheet for a typical >> powersonic 12V AGM battery (12V): >> >> Limit initial current to 1.2A. Charge until battery voltage >> (under charge) reaches 14.4 to 14.7 volts at 68°F (20°C). Hold at 14.4 to >> 14.7 >> volts until current drops to under 50mA. Battery is fully charged under >> these >> conditions, and charger should be disconnected or switched to “float” >> voltage. >> “Float” or “Stand-By” Service: >> Hold battery across constant voltage source of >> 13.5 to 13.8 volts continuously. When held at this voltage, the battery >> will seek its >> own current level and maintain itself in a fully charged condition >> >> >> >> so multiply by four, 14.4V x 4 = 57.6V max voltage at absorption charging >> >> or 14.7V x 4 = 58.8V >> >> >> >> On Thu, Oct 2, 2014 at 4:11 PM, Bill Prince via Af <af@afmug.com> wrote: >> >>> Many new solar controllers will let you program the absorption voltage. >>> We just started using an MPPT controller from Midnite solar, and all the >>> different voltages are programmable per the battery manufacturer's >>> specification. >>> >>> bp >>> >>> >>> On 10/2/2014 12:50 PM, Sean Heskett via Af wrote: >>> >>>> Hi Gang, >>>> >>>> We have a 48Vdc Solar site that the solar charge controller when it >>>> goes into absorption mode the battery array voltage exceeds 60Vdc. However >>>> we have some equipment that doesn't like more than 60Vdc. >>>> >>>> What product are you using to supply a clean 48Vdc (no more that 300 >>>> Watts is needed) >>>> >>>> Thanks! >>>> >>>> -sean >>>> >>>> >>> >>
