Replacing house batteries in our new motorhome with AGM

wa8yxm wrote:
I agree the value and specs look find being GC (Golf Car) batteries they will be DEEP CYCLE which is good.. Now he said Sealed Valve Regulated Lead Acid (Maintenance free) DId he specifically say AGM?

There is truly no advantage to AGM over liquid filled Maintenance freer for RV use. For OFF ROAD use yes. and not just AGM but perhaps Optima (Physically way more rugged than any other battery) but for RV use I have yet to be convinced there is an advantage to AGM over other SVRLA batteries (liquid filled).

They are more expensive however.

But I think you will be very happy with these non the less.

Can you give an example of a sealed deep-cycle flooded battery?

I use AGMs to mount inside the RV where I can't with the fumes of unsealed flooded ones.

I agree the value and specs look find being GC (Golf Car) batteries they will be DEEP CYCLE which is good.. Now he said Sealed Valve Regulated Lead Acid (Maintenance free) DId he specifically say AGM?

There is truly no advantage to AGM over liquid filled Maintenance freer for RV use. For OFF ROAD use yes. and not just AGM but perhaps Optima (Physically way more rugged than any other battery) but for RV use I have yet to be convinced there is an advantage to AGM over other SVRLA batteries (liquid filled).

They are more expensive however.

But I think you will be very happy with these non the less.

https://www.battsys.com/amfilerating/file/download/file_id/8/

Should work. Having four 6s at 77lbs each could be handy. I have a 250AH 12v AGM in 8D size which I needed help with to install it is so heavy.

The charging specs are unclear to me. Usually with AGMs you charge them at a minimum of 20% AH rate, so at least 50 amps for 250, and at some max rate, usually about 30% (except Lifeline you can do more %). This shows cyclical recharge at 0.15 to 0.1 as rate, but for equalizing (see Float maintenance guide at bottom) 0.3 is given. It also says 68 amps max or 27%. Some other AGMs also use 27%. (136 amps on the 500)

If mine, I would recharge the 500AH at minimum 100 amps or more to a max of 150 amps. To do that, you would need one of those inverter/chargers that have those amps. To power a power factor corrected charger such as in those inverter/chargers at 150amps you will need a 3000w generator.

Your typical RV converter will undercharge those batteries with its low amps and incorrect charging profile.

Be sure to fully recharge to 0.5 amps/100AH -- so taper down to 2.5 amps at 14.6v on the Trimetric (you must have an ammeter of some kind to see that figure --part of the AGM set-up) before dropping to 13.6 Float.

Important to wire the four in series/parallel with the load/charging with pos on one pair and neg on the other pair. DO NOT let the dealer wire them up with a "downstream" pair like he probably will.

Sounds like really robust jars. AGM is nice, had 8 lifeline.

Check this out YOUTUBE INDEPTH ON BATTERY JAN2019

The value and specs look fine. I usually compare to Lifeline brand AGM. Not sure what your expectations are to camp off-grid. I suspect you will be running the generator a couple hours every day. If there is space I would be looking to go a bit more battery all things considered. Will depend on your usage.

No I have not used those batteries. My set of 4x GC2 are just wet cell.