Battery choices

[bluedog225]

Interesting to look at new battery tech that is available in real life.

I just grabbed this info while sitting at the airport. Take it with a grain of salt.

I’m trying to decide whether to build a LiFePo4 for a fixed solar application. The LiFePo4 looks pretty good. 5000 cycles to 90+%. Wow. Cells are available in houston.


Regular AGM
-21 cents per wh


Silicate-salt/lead crystal/silicon dioxide (SiO2)
-Great temp range. Charge and forget. Medium depth of discharge. Heavy. New-ish. Long life. Low fire risk.
-32 cents per wh


https://watts247.com/product/12v-24v...15yr-lifespan/


LiFePo4 rack mount Batteries are about $1500 for 4800 watt hours
-Need to protect from temp extremes. Low fire risk. Long life.
= 31.25 cents per wh


https://www.signaturesolar.com/produ...battery-by-eg4

DIY LiFePo4-16*$137 each=$2,192 + BMS (overkill at about $175 all in) + $100 (capacity tester and power supply)=$2,467 for 14,592 wh
=17 cents per wh

[leaotis]

I've got 300Ahs of LiFePo4 prismatic cells made into two, 12v batteries, both with JBD / Overkill BMSs with Bluetooth -(a must have). I haven't had them long but they test to spec. I bought from Alibaba, 8, 300Ah cells were $1600 Aus delivered. BMSs, battery boxes and waterproof 24v 40A charger bought separately. Would be hard to go back to lead-acid now.

[wizbang 13]

but does one need to know what all that means ?

[leaotis]

but does one need to know what all that means ?

Only if you choose to assemble a battery.

[bluedog225]

Here’s a basic video. It’s a couple of years old but demonstrates all the concepts. The cells available have changed since then. As has the pricing on new, pre assembled 12 volt batteries. Some good second and third tier stuff available now for significantly less than a battle born.