C is the capacity of battery. You are using EVE-105 cells, so C is 105.Burgerman wrote:Termination current should be around 1/500th of C initially. Then after everything is balanced it should be adjusted until a full charge termination happens about 15 to 30 mins after balance ends.
No, we did not fully charge the batteries before assembly.
UnicornBurner wrote:Cable is done. Charging time! Fingers crossed.
Burgerman wrote:No, we did not fully charge the batteries before assembly.
Then it will either take hours to days to balance up initially. Or you need to charge one cell at a time with a simple single cell profile, and a crocadile clip simple connection to one cell at once. No balance wires needed and no need to disconnect anything. BEFORE initial charge.
Why? Because is a cell has say 5Ah difference to the rest it will take 5 hours at 1000mA balance current to balance it up. If theres 30Ah difference it will take 30h to balance. Easy enough to do all 8 one at a time to get all 8 full initially. Initial charge always needs some time to balance properly even if all cells are nominally 100% initially.
If you need a single cell charge profile that doesent need balance wiring and you probably do, then I can upload a profile for that. But again you need the CCS software and the FUIM3 to load it and any other profiles you want to add or use. Its pretty much an essential to see on screen whats going on, to change charge settings and to load profiles and update firmware. So you need to find one new or used. I have never charged a chair without controlling everything via a laptop yet. I do when at a flying site for hobby stuff only. And I dont really like it, it feels "naked"... And like you are not in control.
The reason you need my profiles and not the ones they come with for everything is that I have some access that you dont. And there are a lot of settings that are hidden that are changed so that he bigger packs are able to be set correctly without errors tripping you up or unable to set certain things correctly like timeout or voltage and cell limits. Its all super safety nazi as stock that is a pain in the ass.
This applies to all chemistries but esp to lead and lifepo4. And esp large packs. And all the default cellpro profiles are really set up as rediculous super safe for hobby lipo type firecracker packs.
UnicornBurner wrote:Progress!
We made our first pack and are working on the cord end that will plug into the PL8. Thank you to you all for the helpful information and to Shirley for his assistance with the PL8s ZXDs and EVERYTHING else.
UnicornBurner wrote:Thank you BM for your observation about our ability to use 230ah batteries. We did not think they would fit, but low and behold the EVE 230ah do fit in our Jazzy/Quantum Q6 chair. And yes FJ, I did quickly ask my hubby to upgrade to 230ah.
Luckily the EVE 105ah did not go to waste, we were able to install them in a chair our friends use that takes U1 batteries. So if anyone out there uses the little chairs that take U1 batteries, the EVE 105ah will fit. You will need to make two packs of 4 EVE’s and an extended cable to connect them. It’s a tight fit, but a great lifep04 solution for small chairs.
Thanks you again to you all for your support and excellent observations.
Burgerman wrote:They are as close as its practical to measure. That is a minute difference. A tiny bit of oxide or difference in metals on the termnals on the terminals or connectors makes 10x this much difference.
The only sensible way to measure cell resistance that is remotely accurate is by using a AC IMPEDANCE meter. Seperately on each cell. At the half charged (50%) point. These use 4 probes, 2 per terminal. They are accurate. You cant take an accurate DC resistance measurement that means anything by reading what a charger says. If it said one was 40mOhm, and the rest were 5, then you would start looking for a dirty or loose connector.
So dont take a lot of notice of it!
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