diy solar

diy solar

Finally found a LiFePO4 BMS with Low-temp Charging Protection

 
 
Hi @FilterGuy - Let me know how you get on with it! Looking for something simple to do a capacity test with and this things looks super easy. I guess you should have a BMS installed and a fuse on the positive cable.
 
Mine just died ...... I think it overheated ......

So much for that capacity test, trying plan B, discharge via inverter ...... using the BMS as a shunt to measure. Then I'll recharge and add hall effect or something.
 
Stupid Monkey said:
Mine just died ...... I think it overheated ......

So much for that capacity test, trying plan B, discharge via inverter ...... using the BMS as a shunt to measure. Then I'll recharge and add hall effect or something.
Click to expand...
I think people are having more problems with the small heat-sink version and them overheating....
 
OverkillSolar said:
all the more reason for me to design the coulomb counter module!!!!!!!!!!!!!
Click to expand...
I haven't run a 2nd full test, so I don't know what it would show now. I had the capacity set at 280AH and by the time I was at 13.1V for 2,6 hours the BMS was reading 00% left. My fridge shut off at 12.8V or I would have gone some more. Didn't think to reset the low voltage cutoff to the lower setting on the fridge till a couple of days later. Still after the test the BMS says my capacity is 308AH without me changing anything. I could pull up the chart that the BMS has for that whole time. IIRC, it keeps a month worth of data before it starts over writing it.
The funny thing is the BMS says I have 3 cycles on the battery and it changed from 0,1,2,and 3 during the testing period of 6.5 days.
 
Anyone else notice the "cycles" count is odd? I'm still on first initial discharge to calibrate the BMS capacity, and yes way past the 244.64 Ah it wants to say the capacity it but its saying I've done 4 cycles already .......

Just odd.
 

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Stupid Monkey said:
Anyone else notice the "cycles" count is odd? I'm still on first initial discharge to calibrate the BMS capacity, and yes way past the 244.64 Ah it wants to say the capacity it but its saying I've done 4 cycles already .......

Just odd.
Click to expand...
Yes. I had set my capacity to the 280AH spec of my cells and my test was from 13.9V to 12.8V. The capacity changed to 308AH, which is +10%. The cycle count went to 3.

Charged it back to 13.9V and have messed around but not put a long load on it. Just little stuff testing some small stuff and fused distribution box the last 2+ weeks.

Just checked and I'm at 13.43V 86% and still says 3times for cycle count. Literally under cycle count it reads (3times).

Just looked at your screen shot, are you running the yellow elephant version of the app?
What is your version #
I'm running this one and no longer have the Chinese characters like yours does.
 

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Last edited:
running the one from post 1 (unless its changed since posted) is there a better one somewhere?
Cant find the version # now I'm looking but 1.5 rings a bell ....
 
Stupid Monkey said:
running the one from post 1 (unless its changed since posted) is there a better one somewhere?
Cant find the version # now I'm looking but 1.5 rings a bell ....
Click to expand...
Yes this one is much better. Trying to use the parameter changes, causes it to crash.
But you can make changes under the parameter view page, one item at a time.

IIRC the version is the bottom choice in the upper left menu.
Also under app setings change from driving mode to monitoring mode.
Dashboard is much better that way.

https://github.com/FurTrader/OverkillSolarBMS
 
Stupid Monkey said:
running the one from post 1 (unless its changed since posted) is there a better one somewhere?
Cant find the version # now I'm looking but 1.5 rings a bell ....
Click to expand...
We went over this back on page 32 of this thread...
I know it's easy to miss things if you don't read every post. ;)
 
Sgt Raven said:
I know it's easy to miss things if you don't read every post. ;)
Click to expand...
I've about the latter half to catch up on to be honest - should read the whole lot start to finish.
Thanks for the pointers!
Have downloaded the other android app - but at this critical point in the pack discharge I'll stick with what I've checked the settings off!

PS first discharge almost done - hope BMS calculates the capacity .... will fit a shunt before recharging.
BLS cells seem well balanced although a little difference below 3v (2.79-2.93 at this moment) 11.39v
 
Stupid Monkey said:
I've about the latter half to catch up on to be honest - should read the whole lot start to finish.
Thanks for the pointers!
Have downloaded the other android app - but at this critical point in the pack discharge I'll stick with what I've checked the settings off!

PS first discharge almost done - hope BMS calculates the capacity .... will fit a shunt before recharging.
BLS cells seem well balanced although a little difference below 3v (2.79-2.93 at this moment) 11.39v
Click to expand...
I think you would be safe opening the new version, just to look at it. But like you said, don't change any settings, other than switch from driving mode to monitoring mode. That just changes what is shown on the "Dashboard" and is much more useful for a storage battery vs a electric bike or such. Maybe do a screenshot of the current Battery Status and then again with the new version. Then look at them both on a computer. You could open both side by side and see the differences.
 
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