Solar Rule Of Thumb....
I was wondering with so many variables is there a rule of thumb on how large of a solar system you need to keep your batteries charged so not having to run the generator. The factors I would includ...
Forum Discussion
ktmrfs wrote:The only issue I have with Trojans is their high equalization voltage (they recommend 16.2V). That doesn't play well with some of the 12V stuff in the camper, so I would need to open the load breaker before equalizing, which means it can't be automatic. The Costco/Interstate GC2s equalize at 15.3V.
I had a pair of T-125's that I consistently discharged to 25% SOC around 40 times/year, then when home charged them fully. kept them watered. After 10years the SG was still near new. Then they went to daughters in-laws for another 4 years of abuse. Last year they finally were getting pretty worn out, SG on a few cells was dropping, but they still were lasting a weekend. But total number of cycles to 75% DOD was around 500, close to what Trojan claims for life.
The Trojan SPRE are designed for solar applications, and they even make a 12V one. They're not GC batteries. But, they don't publish internal resistance numbers, so it's hard to tell how they'd compare if used for an inverter.
