Could use some guidance choosing AGM’s.

Big Katuna wrote:

BFL13 wrote:

Big Katuna wrote:
2005 Freightliner Fleetwood, Xantech Freedom 458 inverter/charger connected to four 6V golf cart batteries, which need replacing.

I would like to replace these with either two 6V or two 12V maintenance free AGMs.

We rarely boondocks, have a gas option fridge and if we need to use the microwave, will start the genset.

What we DO do is leave the RV plugged in all the time with AC on low, which fries the GC batteries. I have the watering system installed but still manage to forget and they get dry.

Are there direct replacement size wise for GC batteries?

If you are nearly always at full hook-ups, all you need is a simple 12v house battery to power the inverter/charger.

You are right that 6s don't like to Float very much. Xantrex even has/had their 3-stagers with the option to turn off the third stage for that reason.

It is the high SG of 6v batts which makes them not so good for floating them. Lower SG batts are better for floating, but have less capacity and discharge rates.

If you do want an AGM go for a type that is low SG and meant for floating such as those UPS types. But why spend the money? You could get a single simple sealed flooded starting battery like for a car to meet your requirements looks like.

Thank you. I think this is the correct choice for me. My sealed engine batteries are on year seven and start the old C7 just fine. Getting ready to replace them on general principals.

I’ll buy four instead of two

My advice there ASSumes, the inverter/charger will "support" any 12v battery to run your 12v loads, and not really draw from the battery much. Also there is generator starting perhaps.

I am not too clear on inverter/chargers for how they actually work on the charger side. I was told on here that they can't run on no battery like a converter can to run the 12v systems, but instead they need a 12v battery to run the inverter/charger and then you are good. But then I also have seen where you have to "enable" the charger, so I am now wondering if having a starting battery or two as house batteries would work out ok.

Needs confirmation from the other guys on here before buying! :(