Yeah because it's not like they will approve a warranty claim anyways. The warranty is very specific.
-
Join the MyBroadband community
South Africa’s biggest forum. Discuss, discover, and connect with thousands of members.
-
Question of the Day: Are you watching the Commonwealth Games?
LIFEPO4 Battery discussion thread
- Thread starter cavedog
- Start date
Yeah because it's not like they will approve a warranty claim anyways. The warranty is very specific.
wingnut771
Honorary Master
Like "must be installed by qualified wireman".
Like "must be installed by qualified wireman".
Yes but I can always get that. I suppose they will match the purchase date and ask why the coc is x months later.
wingnut771
Honorary Master
It will probably finish balancing in 6 months time when the warranty expires.
You could live with it, it is balancing, its not like you going to gain much by doing this.
I would rather get a victron smart shunt, then you know exactly how many Ah you are getting out.
wingnut771
Honorary Master
Bat 1 is perfect.
Haven't done much testing yet but the CFE battery seems to be performing better than expected. I managed to pull 3.8kW from the battery before it started flashing low voltage alarm.
I think that is more than 80% usable energy. Also while balancing yesterday most cells are balanced. There is about a ~100mV or so imbalance though so I would also need to top balance it a bit.
I think that is more than 80% usable energy. Also while balancing yesterday most cells are balanced. There is about a ~100mV or so imbalance though so I would also need to top balance it a bit.
wingnut771
Honorary Master
How do you know if you cant access CFE BMS?
What pack voltage was CFE 100mV imbalance at?
What voltage was the flashing low voltage alarm?
I have my Fnirsi digital clamp meter. Opened the battery and measured it. At 55.4V pack voltage after resting a bit most were around 3.35v or so and 2 was at 3.55v give or take. I know this because it hit ovp cutoff so I disconnected it and opened it and tested each cell.
I think it was 47.8v fault light was flashing so probably the low voltage alarm.
Since this battery seem easy to balance and the new ecco solar I'm waiting for my bench power supply. I'm going to charge these until ovp cutoff then balance them manually after that so I don't have to worry how they perform when they are in parallel. Then battery 3 will get some treatment.
I want to have it sit at the high voltage for a while to see if the balancer can work after I set the parameters because this one is not easy to manually balance with this cylinder 6p cell packs.
wingnut771
Honorary Master
Maybe check cell voltages again at 47.8V? What voltage was OVP cutoff?
I think it was around 56v or so if I recall correctly because I had my meter on the entire time but as soon as you hit cut off the voltage is a bit lower than the charge voltage.
wingnut771
Honorary Master
Yeah, you want all batteries to be top balanced at 55.2V.
What make is bat 3 with cylinder cells again?
wingnut771
Honorary Master
So this one needs bench power supply also or are you doing the dc-dc thing?
I'm just going to do both with the bench power supply because I can do the whole pack voltage at 55.4v and sit there and individual cells where the dc-to-dc buck max voltage is 40v so yeah can only do individual cells.
Thanks for the suggestion on the lab PSU. Looks like a decent option.
My car runs of a bank of toshiba lto scib cells.
20ah cells x 12 (2p6s) it's ridiculous the power density for it's size.
I only charge up to 14.9v though.
All fed by a 320A alternator.
I had maxwell ultracapacitors but I removed them after retiring the car from sound.
20ah cells x 12 (2p6s) it's ridiculous the power density for it's size.
I only charge up to 14.9v though.
All fed by a 320A alternator.
I had maxwell ultracapacitors but I removed them after retiring the car from sound.
wingnut771
Honorary Master
can do both at same time too. yeah dc-dc thing would be for cells only if balancer is too slow.
