150Ah LiFePo4 flat under driver seat + swivelectomy

[loverofpeace]

[Sodo]

Here’s my batteries now.
13.48v / 4 = 3.37v
Not 3.65v (or 3.60)

Is this considered “balanced”?
I have done nothing specifically other than shut off the 60A DC-DC converter.
The Victron Solar controller seems to be charging them.
_________________


'90 Westy EJ25, 2Peloquins, 3knobs, pressure-oiled GT mainshaft, filtered, cooled gearbox
'87 Tintop w 47k 53k, '12 SmallCar EJ25, cooled filtered gearbox
....KTMs, GasGas, SPOT mtb

[yabert]

[jordauto]

That’s a good level of balance. You can go into configuration settings, then BMS settings, read configuration. Then you can set the battery capacity to your actual capacity. It shows 100AH now. Then set up your full charge threshold and you will get an accurate battery capacity reading. You can also set up the balance conditions and voltage to start balancing as well as the value of delta between the highest and lowest cell. The BMS should eventually balance your cells but the balance current is milliamps so it could take days or even weeks on a big battery pack like yours. The app has a high level of adjustability. I’m not sure about the android version as I’m running the IOS version and with it you have to pay for the pro version to make any changes. But it’s well worth the few dollars. If you’re using a Victron solar charge controller with Bluetooth as well then you can set it to the preconfigured lifepo4 option or create a custom profile. I set a custom profile and have my charge top out at 3.60 volts per cell. There really isn’t much point in going to 3.65 as the way discharge curve is. 3.65 is considered 100% charged. But 3.45 is about 95% charged. It drops like a rock from 3.65 to about 3.4 and then will stay in the 3.4-3.2 per cell range forever.

[Sodo]

I think I'm going to buy a 3.2v charger.
I'll balance my cells then pass it on.

If any of you fellers are gettin' after your swivel with an angle grinder, cut THIS too.
If you ever slide a seat off the rails, do this while the seat is off.

Kinda wondering why I shouldn't just cut the whole tab off.

EDIT- I've been under the driver's seat so many times now with this battery project.....kittens be damned, I just cut the driver-side tab off completely.
_________________


'90 Westy EJ25, 2Peloquins, 3knobs, pressure-oiled GT mainshaft, filtered, cooled gearbox
'87 Tintop w 47k 53k, '12 SmallCar EJ25, cooled filtered gearbox
....KTMs, GasGas, SPOT mtb

[baltik]

sodo - have you watched Will's top balancing video? the charger he recommends takes forever, but I find that to be a small sacrifice given I only have to do this once in a battery life cycle

[Sodo]

Thanks for that prod to watch Will Prouse.
I think I will buy this power supply $70.
I've always wanted one.

(.....unless you advise otherwise.....)
Takes forever?

....@ 5 amps?

My new buddy Will says is they are fairly full it only takes a few hours or a day.

https://images-na.ssl-images-amazon.com/images/I/71TijOn6pSL._SL1500_.jpg
_________________


'90 Westy EJ25, 2Peloquins, 3knobs, pressure-oiled GT mainshaft, filtered, cooled gearbox
'87 Tintop w 47k 53k, '12 SmallCar EJ25, cooled filtered gearbox
....KTMs, GasGas, SPOT mtb

[jimf909]

[squeegee_boy]

[Sodo]

[jimf909]

The idea only came to me when I looked at your photo and saw the end of the spring reaching over the catch. The hard work of others makes laziness possible. Kittens realize this and expect hardworking humans to feed them.

[jordauto]

Sodo, your BMS should be programmed through the app so no cell goes over an absolute maximum of 3.65 volts. You can change the thresholds in settings. Anything over 3.65 can supposedly damage lifepo4 cells. You can also adjust your cell balance parameters for how much delta between the lowest and highest cells, the voltage to start balancing at, and if you want to balance only while charging or all the time when the cells are out of balance. I set mine to all the time until the cells were very close and then set it back to balance only when charging. The balance function is only 50 milliamps if I'm remembering correctly.

[baltik]

Yeah, I too am not understanding how one of the cells went through the safety threshold...

[Sodo]

Jordauto, baltic, thank you for your attention!
We are leaving on a trip to the Oregon desert for a few days and I'd like to get this sorted if possible.
My $63 power supply (30v10A)should be here today sometime, I may have 12 hours or so to 'balance cells' before departing.
Should I connect them in series NOW?

Here's the settings, 3.65v.
_________________


'90 Westy EJ25, 2Peloquins, 3knobs, pressure-oiled GT mainshaft, filtered, cooled gearbox
'87 Tintop w 47k 53k, '12 SmallCar EJ25, cooled filtered gearbox
....KTMs, GasGas, SPOT mtb

[baltik]

i would keep them in parallel as long as possible to equalize, then follow will's instructions to top balance (also in parallel). I would also verify the power supply voltage with a voltmeter as well to make sure it's properly calibrated from the factory.

maybe change the delay setting from 2 seconds to 1 in the BMS? it's possible it spiked really quickly

[baltik]

Here are the default thresholds that Dacien uses on the elctrodacus...

they are more conservative than what comes pre-loaded on the chinese BMS and what I use in my setup. Having said that I would not advise anyone to m,ake changes blindly without fully understanding the parameters. A small typo or misunderstanding can end up a really expensive mistake

[shagginwagon83]

I'd like to see you post your problem on the overkill solar subreddit.

https://www.reddit.com/r/OverkillSolarBMS/
_________________
Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[jordauto]

Here is the settings I'm using for the smart BMS and Victron MPPT75/15 solar charge controller. This is 2 100 watt thin solar panels in series charging a Valence 138AH group 27 lifepo4 battery that has been modified by replacing the original BMS slave board with the smart BMS. We aren't supposed to need an absorption charge but I found the battery wouldn't get fully charged on the Victron bulk charge setting. So I have absorption set to 14.46 volts which get each cell to 3.60 volts or just below.

[ProspectiveOwnergon]

Are these setups not very "set it and forget it" types? Do they require a fair amount of babysitting?

[shagginwagon83]