Lithium Confusion

pianotuna wrote:

01tundra wrote:

pianotuna wrote:

Freep wrote:

pianotuna wrote:

Unfortunately I need -40. There is at least one LI chemistry that can do that--but nothing in a large format jar. Lithium titanate

Do you really need -40? Do you have no water in your rig, only ice?

-40 will kill Li batteries. I've boondocked at -37 c (-34 f). That temperature will also kill Li.

I've since found a battery chemistry called SiO2 which shares many of the attributes of Li. The differences that I'm aware of at weight (greater than a similar capacity lead acid) and the ability to be used and charged at -40. Some of the shared items are no sulphation, and zero maintenance. That means no more needing to get to 100% state of charge.

The SiO2 is about 1/2 the price of Li. It can "do" 900 amps for 5 seconds from a 100 amp jar, which I think is better than Li.

Cycle life is 2800 if you don't go below 50% soc, and 1500 if you go down to 20% soc.

Best of all, the SiO2 are sold in Canada. $600 ($450 usd) for 100 amp-hours. This is a competitive price with AGM.

Mount the batteries inside the trailer?

That won't help save LI when the RV is in storage.