Converting a travel trailer to all 120/240 volt electric

valhalla360 wrote:
I'm failing to see a purpose:
- If you are towing, you need a battery if for no other reason than the emergency brakes if the trailer becomes separated.
- If you are stationary, the battery lasts pretty much forever because it's never run down.

By the time you update all the 12v devices, you are likely looking in the thousands of dollars to pay someone (cheaper obviously DIY but still far from free). All to save replacing a $50 battery every 5-10yrs.

Batteries do not "last forever" just because they are not "run down".

Batteries DO FAIL not being "run down".

Just because modern RVs may have a multistage charging converter does not mean the batteries will "last forever".

Multistage converters will apply 13.2V in storage mode, that WILL boil any battery dry in 3yr-5yrs IF you do nothing to the battery like ADDING WATER.

My GC2 batteries use 16 oz of water per yr and that IS with a converter that DOES go into storage mode at 13.2V, they are substantially larger than any group24/27 battery, they have more water capacity to afford more water loss than any group24/27..

Most RV/marine batteries are SEALED, the tops ARE PLASTIC WELDED IN PLACE and cannot be removed without serious force which typically damages the caps in the process.

If the trailer is not going to ever be towed again, leaving a 12V battery connected is the dumbest thing I have ever heard and a complete waste of money.

Modern switching power supply converters actually CAN be operated WITHOUT A BATTERY CONNECTED. The old transformer linear converters cannot.

OP COULD just remove the battery and as long as they are plugged into shore power the converter should supply enough 12V to run the furnace, lights, fridge control board, water heater control board.

BUT, the thing you are also missing is the OP mentioned replacing the 30A 120V supply with 120V/240V supply which at least means they will be rewiring anyway with new breaker panel and I suspect they were planning to stay in one place..

Not unheard of and I am sure folks HAVE done this, recently seen someone posting about removing all the grey and black tanks and putting a residential toilet..

So, not everyone likes to hug all of the RV stuff..

I AM sure the OP has their reasons for the questions and I would not doubt that they have left the building after all of the sniveling here about batteries being cheap and live forever.. They are not cheap and they do not live forever so if you don't plan to use the 12V stuff why keep it clicking away at a battery?