LIthium battery upgrade - Complete!

2oldman wrote:
Is it possible to have 8 wires coming from one solar controller, connecting 2 wires to each of 4 12v batteries?

Sure, but any wire large enough to carry decent current will be too large in aggregate to fit into typical controller terminals. The use of a bus in between the batteries and the controller can make that happen easily.

2oldman wrote:
Is it possible to have 8 wires coming from one solar controller, connecting 2 wires to each of 4 12v batteries?

Yes, but what controller can handle 4 wires in each terminal ?
And 2ndly, why do it that way ?

Is it possible to have 8 wires coming from one solar controller, connecting 2 wires to each of 4 12v batteries?

oops--sorry. I thought they were li.

pianotuna wrote:
Hi 2old,

Thanks for the depth of charge tidbit.

I see that costco is selling double A and triple A LI cells now. The price was competitive with other small batteries. They are calling them Eneloop. They are claiming 2100 cycles.

Enloops are Li? I've always thought they were typical 1.2V 2000 mah or thereabouts Ni MH?

Li is usually 3.4 to 3.7V, of which nothing much in AAA or AA runs on, too high a voltage.

Enloops

Posted elsewhere. The 9.5 kW-hr LFP battery suite on 5th wheelie 48 V since the 2499 W worth of panels is 90 V and works well. 1490 W at 12 V is 120 Amps but only 16 Amps at 90 V. Still have to go from controller to battery suite and again it would be 120 oddAmps at 12 V and only 28 amps at 48 V. System on Roadtrek is only 415 V and it is 12 V system. The panels are different voltage at 324 and 100 W respectively and require separate controllers. We were up to 300 W in sun at 4000' at Orizaba, Vera Cruz, Mexico
Reed and Elaine

Hi 2old,

Thanks for the depth of charge tidbit.

I see that costco is selling double A and triple A LI cells now. The price was competitive with other small batteries. They are calling them Eneloop. They are claiming 2100 cycles.

I was planning on 4 -12v in series, but after speaking with Relion, and others, that may not be a good move. Balancing is apparently a problem when charging across 4 batteries at 57v, which my solar is. I'm assuming charging 12v in parallel is fine.

They said they're redesigning their 48v battery. I think I'll wait and see what comes of that.

On a general note, I would think more RVs would be rethinking the 12v systems given that big inverters require that huge wire, which is a real pain.

Here's something I didn't know (from Relion):

" If you size your system to discharge 50% each cycle you will not see balancing issues. If your system is set to 100% DOD per cycle you will more than likely see an issue faster. "

Great to see others have made the switch to Li
For us it's been the best upgrade to date for our rig

We went with the Prismatic cells vs the bank many small cells

Enjoy your new electrical storage

We sure do

Hi Eric,

Please keep us updated on how they behave.