New Batteries. What charger type / characteristics?

Well, what I did was to go back to the place I bought the batteries. They hooked me up with a portable charger for winter, that will do the proper voltage for desulfating.

Stored in my garage where I will see and smell them.

That gives me this winter to plan on work to various systems in the rig.

Thanks SoundGuy.

Keith

To each his own... My fifth wheel sets at my home when not in use. Plugged into AC 24 hrs a day..and a8 don’t chec’ the batteries every day..

A battery tender would be the best opti9n to maintain battteries if stored over the winter months and not going to check on it at least monthly...

Leaving everything connected & trusting the converter or battery to take care of things for weeks, months even, unattended is just fine till something fails.

Seen it happen. A boat with 4 very expensive 8D gel cell batterys left plugged into shore power & unattened for a few months. The equally very expensive multi stage charger went crazy & did not drop & stay in maintenance mode.

The owner eventually came back to find 4 $500 batterys cooked. An expensive lesson trusting a charger to do its job unattended.

If you’ve got a more current RV with a 3 stage converter in it then check electrolyte levels if non sealed battery and top off with distilled water

Plug the RV in and let the converter do the work... Most newer rigs have a WFCO 3 stage and sme have a PD 4 stage... either will do the job

You could also just buy a battery tender and connect it and it will suffice with 2 12 volts in parallel or 2 six c9lts in series


Even Trojan website if you read down thru their doc states 3 stage charger is just fine...

https://www.trojanbattery.com/tech-support/battery-maintenance/

wa8yxm wrote:

For TWO Trojan T-105's in series. 220 amp hours. I would recommend the following

IF converter is seperate from power panel Progressive Dynamics 9260
If converter is attached to power panel Progressive Dynamics 4660

These chargers won't give him the 14.8 volts he needs.

When my onboard inverter/charger developed issues & stopped charging I had to find a workaround till I got it fixed. Bought a portable charger with a selector for flooded, AGM or Gel Cell battery type. I have a 4D AGM. Charge rate is selectable 2amp or 15 amp. 15amp is not very high but means that it takes longer to reach the maintenance stage.

If you are storing & have access to the rig there really is no need to get a portable charger. Simply connect the battery bank once a month, let the onboard charger top off the bank & disconnect for another month rendering the trailer electronically dead again.

I have to add a missing word to my initial description. "Portable" charger.

But, now I'm wondering about the battery choice.


Keith

SoundGuy wrote:
My point was that if the OP is talking Trojan batteries then he ought to consider the manufacturer's charging recommendations, primary being a bulk charge voltage of 14.8 volts, not 14.4 volts. And yes Virginia there is a solution offered for this special case - Best Converter offers a modified PD9200 that will in fact do 14.8 volts. You might want to spend more time being helpful than wasting your time being critical of other forum members who are trying to help. :R

Thanks for finding that info ! Good to know that there ARE charger that will meet Trojan specs !

SoundGuy wrote:

So what's your point in directing your comments at me when I'm not the one asking or buying new batteries and a converter? :S

Sorry, they were not "aimed" at you. Poorly worded "general" response.

+1 for the PD9200-14.8 linked above. Probably the 45 amp is plenty. Need to verify wires before you go bigger.