It will be interesting to find out how a new T-1275 responds to my solar's 198 watts and adjustable controller, as this is the main recharging source. My Meanwell and Alternator are the other 2, with the well wired alternator coming close to the 'instant absorption voltage' if RPM's are adequate.
Tickling the lid of pandora's box, these brief 15.5v blasts mid absorption are just for more aggressive bubbling, acid mixing?
I rarely am trying for the fastest recharge possible. I never use a generator. If I can plug in, there is no real time limit.
When weather and overnight Usage combine to make it obvious my Solar cannot hold absorption voltage for 2+ hours, then there is Meanwell or alternator assist usually in the morning, as I seek to be in the high 90% range before the next discharge cycle begins.
My single screwy 31 was a downgrade in capacity from the dual 27 house bank I had run for 3 sets of batteries previously. Sure the cycles were deeper, and I spent more effort in fine tuning voltages and applying EQ voltages, but this lesser capacity was better $ per cycle by a good factor.
The 27's plates got exposed due to their difficult location, but judging by how quickly/exponentially water usage has increased on the screwy31, I'm guessing that the plate exposure was a sign those 27's would have been done for soon enough, even if I watered them in time.
The T1275 increases my capacity by 20Amp hours over the 31. The 31 was an attempt to have my solar come closer to the 'recommended' 10% rate, but of course this is only approached at solar noon. Trojan recommends a 10 to 13% rate, if one is using a plug in charger, and My solar will be ~8.5% maximum, on June21.
I am eager to have a new t1275 battery to compare its behavior to the Screwy31. I hope It is not too difficult to shoehorn into place. I also have to think about how easy it is to remove so I can reach those furthest 3 cells. The mirror and flashlight trick to check levels is a waste of effort. All one can determine is if the plates are exposed or not. A hydrometer extension tube is in my future especially if the weak sister is one of the 3 furthest.
At least the t1275 will be a battery much closer to a true deep cycle. No more screwing around with these compromised 27 and 31's with deep cycle stickers, that also list CCA ratings.
