Sat Nov 13, 2021 1:48 pm
Finally reached the cell testing stage today for the Enerdrive 300Ah battery. The labels says standard max current draw is 99 amps, so over a 3 hr test the battery should deliver 297Ah while still holding above the minimum cell voltage of 2.8v while still under the 99 amp load ...... Will know if it passed or not within the the next 30 mins.
Sat Nov 13, 2021 2:12 pm
The battery voltage dropped below 10.5v before the 300Ah was reached, at the end the load was only 87 amps due to the lower battery voltage, cell 2 dropped to 2.38, the other 3 cells at around the 2.7v and 10.5v shut down resulted in 251.7Ah out of the 300Ah battery.
At least it gives me a figure to work with when I add the 200Ah Winston cells, I should get at least 451.7Ah eh
jon_d wrote: ↑Sat Nov 13, 2021 2:46 pm
Terry,
Which model Enerdrive battery is it.
Some of them have a blue tooth enabled battery monitoring system ("BMS")which shows things like SOC. eg
https://enerdrive.com.au/product/epower ... m-battery/
Q: assuming it is a bluetooth BMS battery, how do you plan to update the capacity in the BMS settings? Is it possible?
Sun Nov 14, 2021 11:50 am
This one is an actual Enerdrive installed system, not one of their drop in batteries. They use a rebranded ePro BMV, so it's just a matter of updating the capacity, similar to the method used for the Victron BMV. Not sure in the Enerdrive BMV uses a plug in module to give the Bluetooth output the same as Victron did for their earlier 700BMV, or if they now have an equivalent to the Victron 712BMV with the built in Bluetooth function. With the Victron 712BMV, the setting can be changed via a smart phone .... this has it's good points and bad points. The owner can fiddle with settings and completely stuff it up, or if they don't change their access password, anyone with the Victron Connect app can go in there and wreak havoc without anyone being any the wiser ,,,, fortunately our BMS system has some many fall back positions designed for redundancy, it can also catch out any part of the system that is not doing what it should and shuts the battery down if there is a risk of damaging it. At that point, the customer rings us and we go through all the systems with them so we can determine what caused the problem, then correct it and they learn the hard way about changing their password.
Finally got the 500Ah combined Enerdrive LFP (300Ah) and Winston LYP (200Ah) battery fully condition charged where the cell voltages rested at 3.55v over night. Now for the load test .... settled on 230 amps as a compromise between the Enerdrive (Sinopoly cells) discharge rate of 99 amps for the 300Ah part being pushed a bit harder and the Winston 0.5CA - 100 amps standard capacity test rate. The 230 amps equals the full load of the Enerdrive 2600w inverter that the customer wanted installed .... the reason for the battery capacity increase originally.
This time we did extract 500Ah with the battery voltage holding at 11.1v and the lowest cell at 2.75v, a vast improvement to the first test on the Enerdrive (Sinopoly) 300Ah that returned 251.7 Ah. I think the full condition charging may have made a lot more of the Sinolpoly cell capacity available even though the discharge rate was higher, so a win all round.
Pumped 50Ah back into the battery and then mounted it back into the van and connected it up to the Enerdrive system to let it finish the recharging to see if all went well with the increased capacity.
This morning the cells were all at 3.45v within 0.02v balance and a terminal voltage of 13.80v, can't ask for more than that.
So, it seems it is possible to mix different age and capacity cells from different manufacturers into a single battery and end up with a successful outcome, in this case an improved discharge rate and improved capacity .....
T1 Terry
EDIT: When I finally figure out why my phone no longer talks to my computer, I'll add some photos to show what was done and the end result.