Hi Kev - welcome to the funhouse!
I had a problem with my trailer battery draining with everything off and finally figured out it was due to a CD/DVD/TV/FM device that had been installed connected directly to the battery through an inline fuse. It was always pulling a small amount of current, maybe about 50 mA, even when off. Over the span of a few weeks, the battery would be completely dead.
I fixed the problem by installing an inline switch to the power line that I could turn off to completely isolate it from the battery when it was not in use.
You may have a similar problem. You can find out if you have a drain by connecting an Ammeter in series between one of the battery cables and the post it was connected to. If you see current flow, you have a constant drain.
Then, the problem is to discover what is always "on", and pulling the power. You can trip all circuit breakers and pull all fuses to see if the drain continues. If not, reset them one at a time until the drain resumes. If there is still a drain with all fuses and CBs off, you have a "hot" circuit to something, like I had.
Even if the battery is fairly new, it could still be defective. Is it receiving charging power when you are plugged into AC? If it is, you will see 13.2-13.4 Volts across the terminals if you apply a voltmeter's leads to them. If you see something like 12.4 V or less, the battery is NOT being charged. A fully charged battery in good shape should show 12.7 V across the terminals with no other load on it.
The refrigerators in RVs ARE very slow to cool down. The trick is to always start it at least one full day before you set out on a trip. I plug my trailer into my house power for this task, and cool it on AC power. Then, I try to fill it completely with food that is already cold or frozen before I switch it to DC for traveling.
Hope this helps. If you need clarification, just ask.
- Jack
__________________
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System, SoftStartRV mounted on A/C
2024 F150 Platinum FX4 3.5L PowerBoost SCrew
|