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Balancing Leaf Packs
#7
(06-29-2020, 05:04 PM)OffGridInTheCity Wrote:
(06-29-2020, 04:51 PM)ZimInSeattle Wrote: ... the 3 higher modules began to bypass at 4.10 volts and they started to get pretty hot. ....
Do you mean the leafmons are getting hot?   If so - that's to be expected.  They can reach 65C (149F).
You can control how hot they get in a few ways....
1) You can set the Bypass Temp Limit and/or Bypass Current Limit on the Hardware -> Cellmon page (lower left corner).  I restrict mine to 1a and 55C - mainly to extend their life.  Others on this forum have their own ideas on this and may chime in. Smile



2) and/or use fans to keep them cool if your setup would allow this.   I use WM4 + Expansion and it has 'fan' control - to turn fans on/off based on temp to keep the batteries (and mons) cool.   I don't use it - but its a nifty advanced feature. 

You should set things up so you're not worried about running balancing...  and of course be aware that they will get hot - its what they do as they burn excess power off from a cell Smile

FYI  - Here's a auto-level balance youtube using Batrium by @Daromer - https://youtu.be/qNNffhusbXQ   Auto-level is different than bypass in that you can run it all day as you use the system - doesn't depend on the cells being 'at the top'.  This is what I use mostly when I want to do a touch-up so the system can continue to operate. 

FYI  #2 - here's the PDF on mons from Batrium website - https://s3.amazonaws.com/helpscout.net/d...er-2.0.pdf
On page 5 - Operations section - its says the that mons will auto-shutdown if temp exceeds 75C (so they can get to 70s..  which is quite hot!).    I read somewhere else that for long life, the temp should stay more in the 50'ish C range as a max - which is why I have mine set to 55C - but can't find it right now.
Thanks @OffGridInTheCity. Yes, I'm aware that the mons will get hot in bypass. Think I will set the temp limit like yours and check into Daromers auto-level balance. I reduced my overall charge voltage to 56.5 volts as at 57 volts one cell was getting over 4.20 volts during bypass. At 56.5 volts the highest that cell got was 4.17 volts. I want to avoid using a fan as well. Thanks again for the help. Smile

(06-29-2020, 09:34 PM)slimf Wrote: Did you capacity test each module ? I have leaf modules from three (possibly 4) different sources and the capacity varies from 250wh to 350wh per module. Big difference. When I assemble into the final battery I will try to spread out the modules into 7 packs in a way that will make them as close as practical to each other as far as capacity goes.
No, @slimf. I did not capacity test the modules before building. Probably should have mixed the modules, but I'm too impulsive and just built up my packs and went at it. The 28 modules I bought from GreenTec Auto were advertised at 326wh while the 21 I got from TechDirect were advertised at 350wh. We'll see how the Batrium deals with balancing them out.

(06-30-2020, 01:20 AM)Redpacket Wrote: Maybe boost charge the lower pack/cells to bring them up to the others?
Keeping the series strings of cells matched in cell capacity is a good idea, otherwise you'll be chasing unbalancing forever.
Thanks @Redpacket. I may give that a try if Batrium doesn't get the balancing done.
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Messages In This Thread
Balancing Leaf Packs - by ZimInSeattle - 06-29-2020, 02:41 PM
RE: Balancing Leaf Packs - by OffGridInTheCity - 06-29-2020, 03:05 PM
RE: Balancing Leaf Packs - by ZimInSeattle - 06-29-2020, 04:51 PM
RE: Balancing Leaf Packs - by OffGridInTheCity - 06-29-2020, 05:04 PM
RE: Balancing Leaf Packs - by ZimInSeattle - 07-01-2020, 12:49 PM
RE: Balancing Leaf Packs - by slimf - 06-29-2020, 09:34 PM
RE: Balancing Leaf Packs - by Redpacket - 06-30-2020, 01:20 AM
RE: Balancing Leaf Packs - by slimf - 07-01-2020, 10:28 PM
RE: Balancing Leaf Packs - by OffGridInTheCity - 07-01-2020, 11:49 PM
RE: Balancing Leaf Packs - by slimf - 07-02-2020, 09:09 AM
RE: Balancing Leaf Packs - by ZimInSeattle - 07-02-2020, 12:39 PM
RE: Balancing Leaf Packs - by ZimInSeattle - 07-04-2020, 12:42 PM
RE: Balancing Leaf Packs - by OffGridInTheCity - 07-04-2020, 03:23 PM
RE: Balancing Leaf Packs - by slimf - 07-05-2020, 05:29 AM
RE: Balancing Leaf Packs - by ZimInSeattle - 07-05-2020, 02:23 PM

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