April to now -- dead battery?

dougrainer wrote:
1. Did your "new" battery start the APU? Does your APU require a 12 volt battery to start it?
2. APU's(gensets) do NOT have a charge circuit. The battery charge is part of the Trailer Power Converter. So, if the battery was low and had enough to start the genset, but the Trailer Power Converter is either defective or the fuse is blown, that means your battery was not receiving a charge and the APU would draw it down as well as anything running in the trailer
3. Slow recharge the battery and then have it load tested. The odds are the battery is OK and the problem is in your Trailer charge system. Doug

1: The battery is on an entry level TT, so there is no APU. I did look into having one installed, and it would have been upwards of $4500 (including fab work to flip the axles and a metal cage for it and a 55 gallon gasoline tank for it.) Instead, I'm using a portable (if you are willing to stretch that word) generator -- a Yamaha 3000iSE to provide power.

2: I checked the 55 amp converter (Parallax Power 7100) while the genset was on, and was getting the normal 13.6 or so volts. It is a single stage battery-boiler (and I plan to trade in the TT eventually, so don't feel like upgrading it), so I watch the water levels and add distilled water when needed. Of course, this doesn't mean that the battery is getting 13.6 volts under load, but that's my tests at the battery terminals.

3: I'm just going to use the dead battery for the core charge. I need more ampere-hours, so I might as well buy two six volt golf cart jars anyway.

I probably should have just pulled the battery and had it sit at home on a Battery Minder, but three months is a bit quick for a battery to sing its swan song.

Long term, the TT is going to get replaced by a motorhome of some type, so I'm not really worried about it, but was surprised to have something go from fully charged to toast in three months, in 90 degree heat.