Garry Hallam

Yes I will be putting some side plates on there! It crossed my mind to put some thread lock on the screws and nuts to combat the vibration loosening them. Not sure what it weighs. I compared the weight difference between 18650 of equivalent rating and these worked out at 1.2 kg heavier for the 12ah pack.

The Balance wires are identical on the bms and active balancer. Should just be a case of connecting the active balance to take readings occasionally. I need to connect the bms up tomorrow. My intention is to put these in a custom 3d printed triangle box that will have access for the testing function. I have access to a 3d printer but need to learn the software, or pay somebody to draw the boxes.

This morning I swapped it over to one of the 1p12s packs to see what was going on. It seems that it goes into active balance mode at 0.02v difference.

I started building another pack but this time in a triangle 2p12s. BMS not yet added but connected up a 1amp Daly Bluetooth active balance for experimental purposes. They were really affordable at about £20 from Aliexpress. My plan is to build 3 packs the same from the 100 cells that I purchased. All will have bms and a lead wired in for the active balance to keep a check on the cells. I was thinking I can swap the active balance module between packs for monitoring as and when.

I'll take your word for it thank you!

Even at 0.09v difference?

Yes I do realise that. It is the balance that concerns me.

Thanks for your input. I guess the best thing to do would be to add an active balancer. Not sure I am prepared for the extra expense!

After sitting overnight the pack is: 42.041 (average of 3.5 cell) 1=3.5186 2=3.5177 3=3.5227 4=3.5198 5=3.5232 6=3.5233 7=3.5225 8=3.4675 9=3.5118 10=3.5110 11=3.4315 12=3.4967 0.09v max differece between 6 and 11 Puzzled!

Charge now gets to 42.93 then shuts off and back on at 41.9. It keeps cycling red and green thereafter but I assume this is normal for lifepo4's. Total resistance of battery is 121 mohms. Output of charger measures 43.611

Update: It apparently needs to be switched off on the switch wire It seems to be charging now!

Guess what, gets to 40.39 and starts dropping still, all this whilst still red on charger. Fresh set of batteries too! Got to be the charger! Is it possible it could bleed back through the charger if it was faulty?

You know I did it is not there

It does show a switch I checked

So I just recieved the new bms. This one looks like the two thin red wires are for switching it on and off or am I missing something?