Daly BMS gone crazy..Update Opinions

If you pulled 32Ah at 65A and used 80% of your 100Ah battery capacity, that would be a Peukert constant of 1.35. That is terrible! The Peukert constant for decent AGM should be something like ~ 1.1. You should have been at 50 - 60% SOC remaining after that test, not 20%.

Edit to add:
How long did you wait before measuring the voltage after this test?

BFL13 wrote:

StirCrazy wrote:

BFL13 wrote:
I don't know how much of the SiO2 "info" is hype. I tested mine to make sure it would do what I wanted from that info, and it did (as reported here last Fall)

I did a steady 65 amp draw on the single 100AH batt and it ran that for over half an hour till the inverter alarmed. Battery voltage bounced back to 11.70v resting, which is 20% SOC on their table of volts/SOC.

Their discharge table says you can pull 67 amps for 45 minutes to the end voltage per cell of 1.85 or 11.1v batt, so that ties in with what I saw.

I don't know about the rest of their claims for how many times you can do that, etc. I do know you can't do that with an ordinary AGM, so I am happy. Have to wait a few years to see how it holds up in service.

let me get this right, you did a 65 amp draw on a 100 amp sio2 for 1/2 an hour. so you should have pulled 32.5 AH out fo that battery but you said after it recovered it was at 20% SOC? does that not set off bells to you, should it not have been around 65-70% SOC after it recovered?

Steve

No , the capacity at the high rate is much less than at the 20 hr rate. You can't use the AH from the lower capacity and subtract that from the higher capacity. Same thing happens with regular batts.

The Trimetric monitor blurb says it ignores all that because most RV draws are moderate and it comes out close enough between higher and lower draws not to bother with Peukert. In the above case, the draw is so high that you would have to figure in Peukert. I don't have a way to calculate all that, but I am not worried anything is wrong with what I got.