Calling on Solar Techies

1L243 wrote:
My wants are a 400 to 500 watt system. I have four 12 volt batteries with 340ah. I am not planning on changing batteries at this time but will go to four 6 volts at 480 hrs in the future.

340 would leave you with 170 amp-hours usable or about 2000 watt-hours.

1L243 wrote:
l would like to use an inverter so I can plug directly into the trailers 110 outlets.

besides TV's I would like to occasionally run electric heat and coffee maker and all the other things that go with RV use.

Everything but the electric heat. You don't have enough watt-hours available for any long term use of even a 750 watt heater.

1L243 wrote:
What size inverter would be recommended? Pure Sine Wave?

3000 watt pure sine wave in a hybrid inverter/charger with load support. I'd recommend Victron or Outback.

1L243 wrote:
I would like a blue tooth controller and a automatic transfer switch and a auto smart charger.

Blue tooth is nice--but it does limit the choice of charge controller.

The hybrid inverter/chargers come with a transfer switch.

1L243 wrote:
It it best to look for a kit? or buy individual components? I plan on installing the system myself.

Kits too often come with charge controllers where more panels can't be added.

Some notes:

Have a budget in mind

make sure the system can be expanded

Start by doing an energy audit to size the battery bank--then get enough solar to charge the battery bank.

I plug my RV into the inverter to run the whole house, but that does require shutting down the OEM converter (I leave mine unplugged), and setting the fridge to propane.

It may be best to stay within one family--i.e. Victron Inverter/charger and Victron solar charge controller. They are designed to "play well together".

This series of articles may help: https://freecampsites.net/adding-solar/