Adding BD time, more batteries

[Wazbro]

Originally Posted by altamont

I am going for more is better and LED's seem like a good start. I'll replace the ceiling lights (13 of them) when I win the lottery.

Check out this thread for those ceiling lights.

http://www.airforums.com/forums/f447...der-97498.html

[nwmsmith]

Thanks for your analysis. We do most of our camping 'off grid', using four solar panels up top. I've been using two Group 27s in our 25FB and they worked great for our first two seasons. Unfortunately, my trailer's winter caretaker (dad) helped the batteries run down to zero when he decided to check the voltage for me a week before my arrival for our first spring trip. He disconnected shore power, measured the voltage. Was happy with the charge and left it disconnected. He didn't hear that one of the fans had been left on. We discovered the 'dead as door nails' batteries a few days later.
Even after using a professional automotive charger, they don't don't last very long anymore.
I ordered two replacement AGMs, but now that I've read your email, I'm going to add at least one or maybe two more under the bed.
I'm thinking 300 amp hours (150 usable) would be good.

[steverino]

Also considering adding one or two more AGM batteries; a convenient place is under the bed at the front of the unit. This brings up the hotly debated topic of whether venting is needed.

I did some research, and found some models on exactly how much H2 is emitted from both conventional lead-acid batteries such as the Interstates, and sealed batteries such as AGMs.

For sealed lead-acid - Batteries H2 Vent - Free Hydrogen Vent Calculator
For conventional lead-acid - Hydrogen Concentration Calculator - Cisco Inc.

You can run the models and draw your conclusions; these have helped me come to a decision.

Steve