battery ah? - Page 3 - Fiberglass RV

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Old 08-16-2016, 07:49 PM   #29
DeBreez's Avatar
Name: Jim
Trailer: Casita
Posts: 68
I recently replaced the original battery in our Casita with a Trojan 27TMH, which is a group 27, 115 amp hour battery. There are other models as well, size can be an issue in small trailers (I had to change the terminals to make it fit) so measure carefully.

I got on their website and called their nearest distributor, who referred me to Atlantic Battery in Miami. Just a little hole in the wall place but super nice people and only $145 with the old battery. Much cheaper than any of the online sellers.

"...I keep blowin' down the road."
2015 Casita 17' Spirit Deluxe
2002 Toyota Tundra V8
DeBreez is offline   Reply With Quote
Old 08-19-2016, 05:44 AM   #30
Senior Member
Name: Joe
Trailer: 1999 Casita 17' SD
Posts: 312
A little clarification is needed here.
The reason the trailer battery is not charging properly with the refer on going down the road is NOT the amperage of the alternator!
It's the voltage loss in the close to 50 feet of wire between the alternator on the TV and the trailer's refrigerator.
The TV's alternator charges it's battery at the proper voltage of around 14 volts but every connection and inch of wire between the TV's battery and trailer's battery presents a small voltage loss, add them together and there's not much left by the time it gets to the trailer's battery when you add in the load of 14 amps the refrigerator takes the voltage in the trailer is reduced considerably.
Chevy trucks up the charge voltage when the load/haul button if equipted is pushed. Some claim that hurts mpg's because of the shifting but my silverado does not shift any differently when the button is pushed. I've also read turning on the head lights ups the volts too but have not checked that.


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