Battery Equalization (Flooded Lead Acid)

[Ntg58]

2025 Thor Delano 24TT with Flooded Lead Acid house batteries. RV is 6 months old. I just replaced one of the two house batteries on Warranty. So my batteries are two different levels of charged. I want to equalize them. But I can't figure out how to tell the charger to do that. I've read through all the manuals on the owners resource pages. Can't seem to get a call back from either the dealer or Thor support. Can someone explain where in the Multiplex System or the Go Power system I tell the charger to equalize them???

 

[16ACE27]

Probably, nowhere.
Use an external charger to "equalize/desulphate" the old battery.
Then connect them together.
The SOC between the two batteries will automatically "equalize" by battery voltage.

 

[DNMakinson]

Equalization is a short term higher voltage that “equalizes” the cells within a single battery. If your 2 batteries are 12V wired in parallel, you don’t need to do anything. Both will take charge amps until the voltage is same in both, SOC will be the same, and they will be in sync.

 

[Mark54]

2025 Thor Delano 24TT with Flooded Lead Acid house batteries. RV is 6 months old. I just replaced one of the two house batteries on Warranty. So my batteries are two different levels of charged. I want to equalize them. But I can't figure out how to tell the charger to do that. I've read through all the manuals on the owners resource pages. Can't seem to get a call back from either the dealer or Thor support. Can someone explain where in the Multiplex System or the Go Power system I tell the charger to equalize them???

I store my two 300Ah batteries indoors for winter, and equalise by charging each separately to 100% SOC before putting back in RV and connecting.
It just means making sure both are the same SOC when installing and connecting.
Use any charger rated for lead-acid, typically 13.6V charge rate.

 

[16ACE27]

Equalization is a short term higher voltage that “equalizes” the cells within a single battery. If your 2 batteries are 12V wired in parallel, you don’t need to do anything. Both will take charge amps until the voltage is same in both, SOC will be the same, and they will be in sync.

First you say it is a "short term higher voltage that “equalizes” the cells within a single battery." So presumably a 6 cell single battery would benefit from an equalizing charge.
Then you say "If your 2 batteries are 12V wired in parallel, you don’t need to do anything". But wouldn't they also benefit from the equalizing charge?

An equalizing charge is a deliberate overcharge to remove sulfate crystals that build up on the plates over time. Left unchecked, sulfation can reduce the overall capacity of the battery and render the battery unserviceable. An equalizing charge also reverses acid stratification, a condition where acid concentration is greater at the bottom of the battery than at the top.

 

[rudyhehn]

Also be sure you are well vented when equalizing.