My AGM to Lithium conversion

The AGM doing "50-90s" is 40AH

The LFP doing "10-90s" is 80AH

So you can get twice but that 10% needs close monitoring that close to the low end knee.

Keep the monitor in synch and know how to read it. Compare AH count with low load voltage for SOC to see if they match within reason

Rbertalotto wrote:

You say the recharge went from 60%-100% in 2.5 hrs at 30 amps. That is 2.5 x 30 = 75AH NOT 40AH. So again that 60% SOC must be wrong. You were down to about 25% SOC it seems from that.

You might be right with this observation because I wasn't sure the Aili monitor was reading correctly at first. The only other variable that would affect this test was ambient temperature. The ICECO refrigerator was in a 55 degree garage only looking for 40 degrees. While with the AGM battery we were in summer outdoor heat of 80-85 degrees.

I'm going to modify the article so there is no confusion..

Thanks for your input....

The battery monitor is only measuring power in/out of the battery. The charger is supplying power first to any house loads and then to the battery. Hence normally there will be a difference and your numbers may be correct.

If the charger can't supply enough power for the house loads then the additional power comes from the battery.

I caught that too but understood what he was trying to relay because in the big scheme of boondocking it will turn out as more potential power available but to some it's not a big deal to dance with solar panels to squeeze out every last bit of production to feed the lead.

Yes some of the magical numbers don't always seem to make sense initially.
But then you just have to live with it. ;)

You say the recharge went from 60%-100% in 2.5 hrs at 30 amps. That is 2.5 x 30 = 75AH NOT 40AH. So again that 60% SOC must be wrong. You were down to about 25% SOC it seems from that.

You might be right with this observation because I wasn't sure the Aili monitor was reading correctly at first. The only other variable that would affect this test was ambient temperature. The ICECO refrigerator was in a 55 degree garage only looking for 40 degrees. While with the AGM battery we were in summer outdoor heat of 80-85 degrees.

I'm going to modify the article so there is no confusion.

Thanks for your input....

". With a 100ah AGM battery I could get 3 days run until the AGM was at 50%……With the Lithium I got over a week before I pulled the plug and the battery was still at 60%.

The Blue Smart Charger would bring the battery back from 60% to 100% in about 2.5 hours! It would take the AGM battery all day on a 20a smart 120v charger……Huge advantage Lithium!"

First- very nice job all round on the upgrades!

Seems to be a problem with that 60% SOC figure for the LFP as quoted above. I suspect a monitoring problem giving the wrong SOC

1. An AH is an AH no matter what battery type. Both batts are 100AH and the AGM was down 50AH and the LFP was down --you think--40AH yet for the same usage the LFP lasted twice as long. Not possible.

2. You say the recharge went from 60%-100% in 2.5 hrs at 30 amps. That is 2.5 x 30 = 75AH NOT 40AH. So again that 60% SOC must be wrong. You were down to about 25% SOC it seems from that.

Not sure if that affects both upgrades or just the first one for getting the LFP SOCs right. It matters to make sure you don't go too low on the LFP by mistake and have the BMS shut it down.

Always enjoying reading when folks do the change over with success and after using lfp understand what some of us that been using it have been talking about.

This statement seems to be a recurring theme.

"WISH I HAD DONE THIS YEARS AGO!!!!"

;)