Had to Lower My Solar Float Voltage-Update

landyacht318 wrote:
The screwy 31 required a lot more time at higher ABS voltages with an even higher finishing stage, when depleted to 50%, compared to when it was recharged from 75%.

Also a higher initial amp rate ( ~25 to 40 amps) from a grid powered charger required lower Vabs for less duration, compared to the low and slow 200 watts of solar on a good sunny day.

I kind of came to the conclusion that any specific Vabs and duration that achieved full SG by 3PM, was only valid for that specific initial depletion level, and every other depletion level, was a compromise using those same Solar controller settings.

But the Screwy 31 was a petulant battery. I am interested in figuring out what a new T-1275 requires in my usage, whenever I get around to acquiring one.

M T-1275 bubbles, for a bit, before I see the SG readings top out, particularly on solar panel with the charge controller set at 14.8V. Of course a 8.5 amp charge rate with a 150W portable aimed at the sun is not exactly a C/10 charge rate either. But 35-45 amp hrs a day being replaced with the solar panel before noon, this time of year, is easy. By lunch time, I reset the charge controller to 13.6V and call it good until 6 pm, then I might bump the V back up to 14.8V, chase the sunset for a few more amps, then aim the panel east for recharging at day break.

I think next go round, I'll get the GC2's and just set it at 14.8V and not worry too much. Getting the last bit of charge into a T-1275 can be a bit time consuming, in a sense, they are fussy. The SG is slow to respond when top charged.