Lithium battery discharged for no reason

Well there's plenty of advice for you which will give you some things to look into, meanwhile I would suggest you switch off the invertor when not in use as it could be drawing around 24ah per day if it's a good quality invertor, and even more than that if it's a 'cheaper' one.
 
I think I'm confused my self it must have been at13.5volts before and on float as it doesn't seem to change even when the battery has discharged
 
no profession of knowledge but i had a victron permanently on float and we also had the same problem with alan a couple of weeks ago , jeff told me how to reboot it and we also found the same information on victron’s site
IMG_2442.jpeg
 
Cheers Jeff. I've reset the solar controller like ken posted and it's now on absorption which is hasn't done before so that part might be sorted . I've deleted and reinstalled the ecoworthy app which is now showing 90%soc at 13.4 amps does that sound right?
 
Sounds good to me, keep your eye on it and I will give it the once over at the Rolls Royce rally
 
Thanks Jeff should I try and drain the battery down using the inverter and see if it drops to zero unexpectedly again?
 
In future you can cross check what the app says you have left in percentage against the voltage by using the chart below. Be aware that the figures are RESTING voltages, IE when the battery isn't being used or charged. If it's been heavily used say by an inverter or charged then let it sit for half an hour or so to settle before using the voltage readings.
 

Attachments

  • Screenshot_20260409-094641.png
    Screenshot_20260409-094641.png
    71.4 KB · Views: 61
think you’ll find steve that your problem is sorted if your on float you’ve effectively got no solar and possibly not had for a while , the controller moves between float, absorption and bulk that was my problem when i had been on mains it never reverted now i keep an eye on it
 
The battery has done it again van was parked on drive with according to ecoworthy 60% charge. I check the app quite regularly and it was steady at 60% and no load . then suddenly 0% .I got in touch with ecoworthy as battery has a warranty they asked me to do some checks for them with a multimeter. Was told to fully charge battery and check readings it was 13.86 v fully charged. Then to connect a load until battery was flat and tell them how long it took and what reading was when flat. I ran a load of 1000watts it took 3 hours and 25 minutes to go flat and the reading was 10.58 v.. they have replied saying that the battery had only lost 20 to 30 % of it's capacity in a year and that was good. I'm certainly not a expert but surely to lose that amount of capacity in a year is not good at that rate it will have lost half its capacity by next year. . Would anyone who has a better knowledge than me think this is normal or are they fobbing me off
 
I haven't done the maths but losing 20% of the original capacity is the industry standard for a knackered LFP battery. Considering battery sellers typically claim many thousands of cycles and many years of life if its lost 30% already then it's not living up to their claims.
How accurate is your 1000W load?
What did you use?
Does the app give you access to individual cells voltages? (Your issue could be simply due to.out of balance cells)
Do you have a shunt fitted?
 
You must log in or register to reply here.
Back
Top