How much solar for Refer only and Charging?

[lightsout]

We own in a Private RV Resort, from April to Oct we will store our 3791RD on site (they have a storage lot) then we will use for 14 days at a time (membership requires that we can stay 14 days then out for 7 days that resets our 14 days again). I want to be able to leave the residential Refer ONLY on for that 7 days when we are not there and still make sure the batteries are charged. I Intend to have 300-400 AH in Batts. Will be located/stored in a very sunny desert location in Eastern Washington.

How many solar watts are recommended. to maintain that load. Since the Refer will remain closed it should not cycle much but outside temps in the 80-100 are normal daily temps.

To limit the discussion I have no boondocking plans (have gen) so want to start with the minimum and upgrade later if needed.

In know the answer is subjective but best practices welcomed

[jeffba]

res refer pulls a max of 3 amps. So max draw is 360 Watts. that should give you a starting point