Battery life 2020 Jayco Precept 34g

In my survey I listed everything I could and included all rv mounted items including awnings and recliners.ect..all by walking from front to rear for 12v items then checked all known 12v items including ac./ inverter ect.. Then I guess on daily use for every item even though items are not all used every day or even week and totaled about 19,000w.

So I just installed a victron bmv712 to test next weekend how it goes.(in the driveway without ac.

In my survey I listed everything I could and included all rv mounted items including awnings and recliners.ect..all by walking from front to rear for 12v items then checked all known 12v items including ac./ inverter ect.. Then I guess on daily use for every item even though items are not all used every day or even week and totaled about 19,000w.

So I just installed a victron bmv712 to test next weekend how it goes.(in the driveway without ac.

Jay58 wrote:
What would one expect 2-6 volt batteries (225ah) wired for 12v to last with a 21 cup ft residential fridge.

No other significant use I would expect 24 to 48 hours before the inverter shut down from low voltage.

Solar will of course extend that time expectation. You will need more than 500 watts and at least 4 batteries to attempt continuous use. Lithium will make your solar more effective as it does not have the long absorption time of slow charging like lead-acid.

Remember, verify IF your Converter or Inverter/Charger is capable of correctly charging Lithium batteries. You cannot just plunk in Lithium's and expect your system to be compatible. Doug

The correct path starts with an energy use survey to determine your AH need. If you’ve done the survey, what is your expected average daily AH total use?

Jay58 wrote:
As we speak. On monday I will order the panels (2-24v) and batteries (2) and 24 to 12 for the 12v on the rv. Later my plan is to add batteries and panels as I can

What are you using for a charge controller ?

I've done a lot of reading over the last 8 months and hope to be going down the correct path.

Not to be confusing. My end goal in 2 years, when I retire, I am planning on 2k in lithium and 1400 watts solar.1200w (24v) rigid and 200 flex. Will use tiltable mounts for rigid.

Just bought the motorhome and dont have funds to do all at once.

As we speak. On monday I will order the panels (2-24v) and batteries (2) and 24 to 12 for the 12v on the rv. Later my plan is to add batteries and panels as I can

Jay58 wrote:
Well I figure I'll start with 2 battleborn lithium (200 ah and 2 24v 200w panels and x fingers. I can always build from there.

I just hate throwing out 2 6v agms.

You did not mention in your original post that you had solar panels ! Unless you are parked in the shade or have very cloudy weather, a pair of 6V AGMS should work fine !

Personally, I would not buy the lithium batteries. I would get 2 more matching 6V AGMs.

Jay58 wrote:
What would one expect 2-6 volt batteries (225ah) wired for 12v to last with a 21 cu ft residential frige.

It really depends on the outside temperature AND how many times you open and close the door ! I you never open the door, 24 hours should be no problem :R

Residential refrigerators work best with pure sine wave inverters.