Lithium battery discharged for no reason

Jeez! No wonder I'm happy being a blinkin' Luddite who loves good 'ol windy down vehicle windows and other stuff that doesn't rely too much on modern elecktrickery, Apps and excessive amounts of computer chips!! 🥴 :cool:🤣🤣🤣

I'm definitely not quite nerdy or interested enough for getting my head around all this battery/inverter/solar stuff.... (but, unfortunately, I might have to show some interest soon, although nowt to do with campers 🙃 😵‍💫:unsure: )

Simple living. 😇

Think I'm quite content to take the plunge with a plug-and-go portable power station for now, it will do more than I need for the foreseeable 👌(y)
 
I used a 1000watt heater to test the battery the app was agreeing with the load output. The app does show individual cells voltage and they are normally all the same. No I haven't fitted a shunt.
As I thought then the battery is at fault. Will send another email unfortunately ecoworthy are Chinese based so reply won't be till tomorrow
 
jeffmossy said:
Steve, have you sorted out the wiring to how I told you what needed doing?
Click to expand...
No not yet Jeff I've found a hidden compartment under the locker where the controller is so can run the wires in there and then down the trunking you showed me behind the drivers door. I just need to get the correct size wire
 
The wireing is a Big part of your problem, I would recommend you get this sorted ASAP, then you can start to look at your battery if it has got a issue, but I suspect the solar installation is your problem
 
10 AWG 6mm minimum for your set up, it won't do you any harm if you go for the 8mm, and don't forget to put a fuse on both ends of the positive wire
 
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You achieved 3.42Kwh.
A 280Ah battery will be 3.58Kwh. BUT that figure doesn't allow for inverter losses.
The maths says you achieved a superb 96% inverter efficiency....my guess would be your inverter is slightly less efficient than that and your battery is actually a couple of percent OVER 280Ah.
Reading back through the earlier posts your problem is as I've previously mentioned and you can't rely on the BMS to give you an accurate percentage remaining reading. As I've said before a shunt is what you need.
 
MERL said:
You achieved 3.42Kwh.
A 280Ah battery will be 3.58Kwh. BUT that figure doesn't allow for inverter losses.
The maths says you achieved a superb 96% inverter efficiency....my guess would be your inverter is slightly less efficient than that and your battery is actually a couple of percent OVER 280Ah.
Reading back through the earlier posts your problem is as I've previously mentioned and you can't rely on the BMS to give you an accurate percentage remaining reading. As I've said before a shunt is what you need.
Click to expand...
The solar system that Steve has got installed I's a very poor job and not wired up as it should be, hopefully when he sorts it out then that should be the end of the problem that keeps happening
 
MERL said:
You achieved 3.42Kwh.
A 280Ah battery will be 3.58Kwh. BUT that figure doesn't allow for inverter losses.
The maths says you achieved a superb 96% inverter efficiency....my guess would be your inverter is slightly less efficient than that and your battery is actually a couple of percent OVER 280Ah.
Reading back through the earlier posts your problem is as I've previously mentioned and you can't rely on the BMS to give you an accurate percentage remaining reading. As I've said before a shunt is what you need.
Click to expand...
The solar system that Steve has got installed is a very poor job and not wired up as it should be, hopefully when he sorts it out then that should be the end of the problem that keeps happening
 
jeffmossy said:
The solar system that Steve has got installed is a very poor job and not wired up as it should be, hopefully when he sorts it out then that should be the end of the problem that keeps happening
Click to expand...
I'm not doubting your knowledge of Steve's system Jeff and of course if it's sub standard it should be corrected and upgraded but Steve said
Steve and Julie said:
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 .
Click to expand...
I personally can't see how the SCC wiring would cause the App to go from 60% to zero with no load..... surely that's an app reporting error?
How accurate the BMS is at recording and assessing the current SOC massively depends upon how the the chosen BMS assesses multiple parameters and the upshot is that although BMSs often make a decent job of the calculation it's often far from perfect particularly during long lay up periods of very low current draw which the BMS often doesn't 'see'. Shunts aren't perfect but they are typically way more accurate and reliable than using the battery app.
 
Totally agree Merl, I think it is one of the jobs that needs to be done in stages to get to the root of the problem, like you said the BMS, could be faulty but if he starts from scratch and he knows the installation is as it should be, he has then got a case for a replacement battery under warranty
 
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