is one 12 volt grp 31 battery enough for me

The Lifeline 31XT is only 105 amp hours. A bonus with the HT is its ability to run a 900 watt microwave at Full Tilt Boogie using a sufficient pure sine wave inverter.

Jesús, just told me he fried the board on my 1600 watt LG commercial microwave while running it on my TRACE 4024 pseudo sine wave inverter.

Lessee, that makes the 3rd time the board has fried on inverter power in the last ten years. Yet the microwave clocks what, <1% of it's run time on modified sine wave? This was a thousand dollar stainless steel commercial microwave. He was operating it on "4" which time pulses the energy to heat up three cups of coffee.

LG is not junk. Their commercial model even less so. The refrigerator and the freezers all have electronic controls, and they haven't failed. But the three other microwaves including inverter models all failed while on inverter power. Two blew their magnetron. I am willing to forgive two blowouts while on inverter but not not three times.

Lithium Ion. this setup needs superb management both for charging and discharging. Not: "here-today-gone-tomorrow" reliability. Overcharge once, it's a goner, overdischarge once, pounds a stake in it's heart. So it's not merely the battery that has to lower in price - but a management electronics and monitoring system that sticks with the battery in the long haul. Is there such a thing as a separate Li-ion management system that does not compete with a RR Phantom Extended chassis for cost?

GordonThree wrote:
The iron phosphate chemistry makes them much safer, at the cost of capacity and performance. The hover board batteries are lithium polymer, very dangerous if abused.

Thanks for that, otherwise I would never be the wiser. :)

GordonThree wrote:
The iron phosphate chemistry makes them much safer, at the cost of capacity and performance. The hover board batteries are lithium polymer, very dangerous if abused.

Facts be known is much better than hysteria of the unknown. ;)

Xantrex recommends 200+ amp hours per 1,000 watts of Inverter

your Group 31 is 130 amp hours.. you really need 4 of them (though 2 might work).

Recommendation if you can fit 'em is a pair of GC-2.. I know that will work with a 2,000 watt inverter,,though 2 pair is better (recommended).

The two story Lifeline Group 31 is the Lifeline GPL-30HT rated at 150 Amp hours.

When looking at its specs, one might infer the plates are even thicker than the gpl-31XT, and not just taller.

Much more weight for only 25Ah more capacity, and not much more cca either.

I briefly had a GPL-31XT (125AH)in my possession when it was new.

its fully charged resting voltage was 13.16v or higher.

it had absolutely no issues sucking up 100+ amps from a fast spinning capable alternator when depleted to 50%.

Impressive battery.

Not sure if it can handle a residential fridge for long enough for the OP, but if the height is there to fit this tall boy GPL-30HT, then Me thinks it would a very good option, as long as one can be bothered to high amp recharge it at no less than 20% rate, and can regularly achieve a true 100% State of charge

The iron phosphate chemistry makes them much safer, at the cost of capacity and performance. The hover board batteries are lithium polymer, very dangerous if abused.

2, 6 volt golf cart batteries?

Harvard wrote:

dave17352 wrote:
Well I have been doing a little more reading on these lithium batteries and the look pretty kick a@@! Looks like they do everything better. Now just make them cheaper.

and they do burn good. :B

no danger with that. I mean they have used them in skate boards for years and ........., OH never mind.
bumpy

dave17352 wrote:
On these lithium batteries I did not read where you could run them all the way down. I read someplace that you could run them to 80 percent discharge. Do they deliver more power for the surges than a AGM flooded battery?

Yes you may run them all the way down. BMS disconnects above 16v or below 8v. But honestly almost all the energy is between 14.5 and 11.5 so I would stick with that for longest life.

Also no worries about leaving them half charged in storage as this is the preferred storage level.

Cranking amps is misleading as it is just rated 3.5 seconds vs. I believe the CCA definition is for 30 seconds. I would stick with max continuous draw or even 80% as a practical design criteria.

This info is included in the linked documentation.

Huge benefit to solar users is that there is no long slow absorption charge. Lithium pretty much fills to 100% at full speed.

And absolutely no need to provide venting for lithium.

dave17352 wrote:
Well I have been doing a little more reading on these lithium batteries and the look pretty kick a@@! Looks like they do everything better. Now just make them cheaper.

and they do burn good. :B