When I re-do the electrics in our Surfside
project, I will not install a converter. I will, however, install a BatteryMinder battery
charger that'll help keep my battery healthy whenever I have shore power. If you are conservative with your 12v power use and have solar
to boot even their smallest, $60, 1.3 Amp trickle charger should do the trick, but we plan to install their $130, 8-amp charger, which can more than keep up with the meager demands of out LED-lighting (max 2.5 amps with all the lights
turned on), 12v furnace
(2.8 Amps), 12V TV/Radio/DVD Player (1.1 Amps).
The idea of a rating on a box (or other electrical
device) is to note its maximum
capacity rating, so a 15 Amp breaker can handle 5, 10, or 15 Amps, but not 20. It can handle up to
15 amps of current, but but not more. A 40 Amp box can handle up to
40 Amps of current, but not more. A 40 Amp box is fine, just don't put breakers in it that add up to more than 40 Amps.
Lynne and I have a 30-Amp system in our Scamp
5er, but carry both 15 and 30 Amp shore lines. We only pull out the 30 Amp cord when that's the only service available at the campground; the rest of the time our 15 Amp service is plenty for us and all our goodies. (A 900 watt microwave
, coffee maker, propane/110v 'fridge, water heater element, toaster, and ceramic cube heater are our biggest power hogs. We don't have A/C.) We've only once tripped our trailer's 15 Amp breaker . . . but never the trailer park post breaker. My take on 15 vs 30 Amp is it's nice to have the larger capacity, but most times you don't need it.