Question re Discharge

[5teve]

Hi Guys

I have a 2p4s CALB celled 326ah battery with a 250A Daly smart BMS. I'm just doing its first discharge and charge (except a few top ups when messing with the installation. Now i'm not thinking anything is wrong... but just curious..

I have a constant load of about 2.7a on the boat running Venus OS raspberry pi router and inverter (multiplus 12/3000) then its running a DC fridge and also a 240v fridge via the inverter so a spike in current every hour or so up to 12a..

For the first 24 hours the battery held at 13.25v then just after 24 hours it steadily over 6 hours dropped to 13.1v (i actually thought it was getting to discharge end but BMV was saying about 55% SOC at the time) then its held at 13.1 - 13.07v for the last 13 hours or so - as its a bit of an unusual shape graph i was wondering if this was kind of typical and the ones you see posted are more a smoothed voltage curve.. image shows last 24 hours.. and last week..

Your thoughts would be appreciated..

Steve

 

[snoobler]

Top blue line is a low C-rate discharge for Eve cells taken from the data sheet:



As you can see, it takes a small step at two points. Seems consistent with what you're seeing.

EVE LF280N

This Datasheet corresponds to the LF280N, which is the newer model of 280 Ah cell produced by EVE. This is probably not what you have if you bought 280Ah EVE cells on the grey market (Alibaba, etc) unless you bought direct from the manufacturer...

diysolarforum.com

 

[5teve]

Thanks Snoobler.. All the graphs I had seen were pretty smooth.. its now on a slightly downward trend.. now at 13.04v and 33.9 SOC after 55 hours and 224.5ah consumed.. i'm actually pretty happy as it looks like it will survive 3 days with no input.. solar will help immensely (working on 400w) once i get it on and in the short term genset will be able to cope.... i may even be able to heat the hot water with care and a bit more capacity..

Steve