Batteries Won’t Last the Night

[Zapnod]

I have a 2021 Thor Omni. I put in 4 new batteries and the batteries will not last the night. The control panel says the batteries are at 13.5 when we go to bed but they are at 10 when we wake up. With 4 batteries they should last for at least 48 hours. Any ideas?

[Chateau_Nomad]

Sure. What does your ammeter tell you about amp draw from the battery bank? What appliances are running? Inverter? 12v refrigerator? Water heater? Air conditioner? Fans?

A fairly simple energy audit will give you all the answers. But people on a forum have no idea of the type and capacity of your battery bank. We also have no idea what you have running/connected at night.

An energy audit gives you this data. In the process you will learn all the intricacies of managing electrical power in an RV... how much power your inverter is using (if on) and how to track down parasitic loads. By understanding how much energy each device uses, you'll know how much battery power you need to operate overnight.

This may help:
https://outwardspaces.com/tips/how-t...ional-vehicle/

[lwmcguire]

Our 4 older FLA wouldn't power fridge and heat all night plus coffee maker before generator time

Changed to Trojan T105 AGM and solved the problem

I'm going on 4 years now and still maintaining capacity

[dkoldman]

Originally Posted by Zapnod

I have a 2021 Thor Omni. I put in 4 new batteries and the batteries will not last the night. The control panel says the batteries are at 13.5 when we go to bed but they are at 10 when we wake up. With 4 batteries they should last for at least 48 hours. Any ideas?

You just spent close to $1,000. You should take off the gloves.

What type of batteries did you buy?
Who installed them? If so; what did the say when you took it back?

FWIW,
I had brand new 2019 NAPA OEM batteries, both passed the load test, but genny would come on every morning around 6:00 AM if not in quiet mode. I got all kinds of ideas of how to try to fix or maintained them with water etc

I dumped both batteries and bought 2 Vmax Tanks 125 ah AGMs and I can go two full days, no solar no nothing. I never have to go into battery compartment.

It is amazing how I use to always worry about the batteries; to batteries that is a nonissue that I never even think about.

With that said, you could be running something that is not intended i.e. a Propane fridge off an inverter will kill even my vMax tanks over night if I left it on Inverter.

[Scubawise]

Originally Posted by dkoldman

You just spent close to $1,000. You should take off the gloves.

What type of batteries did you buy?
Who installed them? If so; what did the say when you took it back?

FWIW,
I had brand new 2019 NAPA OEM batteries, both passed the load test, but genny would come on every morning around 6:00 AM if not in quiet mode. I got all kinds of ideas of how to try to fix or maintained them with water etc

I dumped both batteries and bought 2 Vmax Tanks 125 ah AGMs and I can go two full days, no solar no nothing. I never have to go into battery compartment.

It is amazing how I use to always worry about the batteries; to batteries that is a nonissue that I never even think about.

With that said, you could be running something that is not intended i.e. a Propane fridge off an inverter will kill even my vMax tanks over night if I left it on Inverter.

Well thanks for helping us with our AGMs.
No worries

[DavidEM]

What are you running overnight? DC fridge not propane? Any AC appliances from an inverter? Furnace? Tank heaters?

All of these are power hogs.

David

[ducksface]

If we knew
Brand
6v or 12v
Type
What runs at night
ANY HINT other than 4

We'd have this answered for you.

Start over
Present all you know
In turn
We'll present all we know.

[The Gritz Carlton]

My 35SF had 2 6V flooded. It would run the fridge for 2 days before dropping to 11.2. You may have bypassed a battery or 3 in the changeover or connected something wrong. Unlikely 4 new batteries are all bad but you should load test them first, while the are at full charge. They should make the overnight trip with ease. What else, if anything (TV's), are you running off the inverter feed outlets?