Build a Battery … Where to start?

[Zwy]

I think I just need a good crimper for smaller wires, the big stuff I love. But I got a nice crimper and buy good lugs. But the small stuff just seems to be unreliable… you say this “one” but it is not linked, and not sure it was named in the video other then snap-on I think?

As for the Snap On crimper, it is really a Thomas and Betts WT111M of which I own probably 3 of those.

I am open to the switch as you can see I did on the batter balance leads, but find them frustrating when the crimpers only work 1/2 the time.

As mentioned, fold the wire over. I prefer non insulated terminals and add my own heat shrink if desired. The heat shrink is numbered, I use my label printer with printable yellow heat shrink. I cover all of that in my shop system build videos. The Luyan boxes I did not heat shrink but those are easy enough. The shop battery bank was tighter on access and it is much easier to label to ensure the correct balance lead on each cell.

 

[MattMan119]

I would say his is he battery performing better then the stated 304ah… but this is a big gap, and I really want to know if the bms is just wrong (maybe it needs calibration?)

So luxpower is eg4 batteries …. Averaged here they are

 

[MattMan119]

Looks like from voltage it may be around 20% … that would make sense if 300ah eg4/luxpower is 6% and 304ah jk1 is 29% … Will just have to see how long it will last without help… pretty good so far with hot water 24x7 …

 

[MattMan119]

Yep, little adjustment of voltage and amps and boom we are all good.. but this today was what made me most happy …

 

[740GLE]

I’d be very happy with that, job well done, now torture test it with a .5c load and see how they behave, that’ll be a test of your cell connections as well.

 

[MattMan119]

I’d be very happy with that, job well done, now torture test it with a .5c load and see how they behave, that’ll be a test of your cell connections as well.

Funny you should say that … did .4c yesterday as it was the first time I used grid in a few weeks.. figured it was cloudy and I was at 1% so what the hell run a test… no heat, no odd readings, no weird charging, ony 27mv max difference… I have been very very very very lucky ….

There was about 20 mins where I did 108a or .54c … it did not blink, i could not find anything that was not as it should be ..

 

[MattMan119]

Funny you should say that … did .4c yesterday as it was the first time I used grid in a few weeks.. figured it was cloudy and I was at 1% so what the hell run a test… no heat, no odd readings, no weird charging, ony 27mv max difference… I have been very very very very lucky ….

There was about 20 mins where I did 108a or .54c … it did not blink, i could not find anything that was not as it should be ..

You know I just noticed this post was based on 200a max charge rate, not the 304ah battery size,., lol .. so I only tested .35c for short period and .29c long charge ..

 

[MattMan119]

Recorded how I adjust the voltage and amperage setting with my JKBMS .. This method is showing very good results so far.. if you have JKBMS you should calibrate voltage and amperage settings.

 

[MattMan119]

I think it is safe to say everything working, and I can build to battery top and mount the meter?

 

[740GLE]

That’s in the middle of the voltage curve so it isn’t saying much. But from your previous high state of charge screenshot, I think you’re good to go.

 

[MattMan119]

That’s in the middle of the voltage curve so it isn’t saying much. But from your previous high state of charge screenshot, I think you’re good to go.

I had a rainy day today, so running batteries down one more time. Now I hope I can to get a 2-3 day full recharge .. (at least it looks like I have 3 full days of sun coming.. ) so it will be good to see it get charged to the top again and make sure they stay balanced. Then I just can’t put off building the top for that battery and calling it done..

 

[MattMan119]

That was a banner day for sure… should make it back to 100% easy tomorrow…

 

[MattMan119]

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[MattMan119]

Well i don't know what I did their .. but this was when full charge hit 56.2 .. And about 20 mins later was <.005v difference a again .. Think it is very safe to call it done and good..