diy solar

diy solar

I found a battery on ebay, free shipping, 100Ah $299... im going to do a load test on it... should i post a video here?

Another update/warning. Started building a 4 battery 24v pack today. The design choice of using a piece of highly conductive aluminum as a handle almost lead to a disaster while installing bus bars.

If you're running flat bus bars across the top of multiple batteries, be sure to thoroughly insulate them or you will create a short through the handle
 
wild01 said:
Another update/warning. Started building a 4 battery 24v pack today. The design choice of using a piece of highly conductive aluminum as a handle almost lead to a disaster while installing bus bars.

If you're running flat bus bars across the top of multiple batteries, be sure to thoroughly insulate them or you will create a short through the handle
Click to expand...
ABSOLUTELY!
The handle CERTAINLY is an issue if trying to use bussbars to connect the batteries!
I plan to remove the handles for SURE!
I will post up pictures when I get the set loaded into the solar trailer build.
I haven’t decided if I will use bussbars, or cables to tie the banks together…
 
Supervstech said:
ABSOLUTELY!
The handle CERTAINLY is an issue if trying to use bussbars to connect the batteries!
I plan to remove the handles for SURE!
I will post up pictures when I get the set loaded into the solar trailer build.
I haven’t decided if I will use bussbars, or cables to tie the banks together…
Click to expand...
On the plus side if you need bus bars the handles might work?
 
Halfway through my balance. I'm optimisitic. I've topped off cell #1, the low cell, and it took about 24 AH. This was starting with a battery that had taken as much as the BMS would take. So this 80 AH battery might get back to 100.
Thanks for all the help here.
 
bruceb58 said:
The Bogart is 80s tech. Surprised people still buy the stuff.
Click to expand...
Who says I still buy it... I've been offgrid for over 20 years.

I was using it because all my reliable stuff is installed in systems.

Some of that old stuff is just f@ckin bullet proof. I'm still using my old trace 2012 in my emergency backup system. I'm convinced that thing will never die. Hell the things charger puts out 110a.
 
bruceb58 said:
Post #139
Click to expand...
yes, I'm fully cognizant as to what I wrote. just wondering what seemed contradictory about it to you. I pointed out my bogart meter was junk, you said it was old technology and didn't understand why anyone would buy one now, I said I didn't buy it recently, and I also pointed out that not all of that "old" tech was junk... Yes obviously my bogart meter is, but I've also got other old offgrid stuff that has proven to be better built than most anything on the market today...my case in point an old trace 2012...I don't find anything about that to be contradictory.
 
Has anyone figured out if this BMS balances, and if so what current and when?
 
had one battery suffer complete bms failure today. will not charge or discharge through the bms. Have contacted Jim Gee for warranty. will update with outcome.
 
Has anyone debated swapping in another BMS? It would be nice to have Bluetooth monitoring especially to see how well balanced the cell packs are.
 
Since the kill-a-watt meters were mentioned earlier, I want to point out something I just found out. I had also been using the similar meter linked below (two of them). I liked it because it had battery backup of the data unlike the kill-a-watt. However I bought a new one the other day and it will not read the reverse current anymore. It instantly gives an overload regardless of how little the reverse current is (the older ones work fine). It also works fine if used as intended. So it looks like they may have changed something in the firmware or something to not let it be used like this anymore. Either that or I got a strange dud.

 
I finally got my batteries, and I just swapped the BMS with a JBD 120A on one of them. The work was pretty straight forward. The JBD is a tight fit but I was able to get everything in there within appropriate isolation and rub protection. The indentation around the handle makes it more difficult.

I fully charged the battery before doing this swap with my bench power supply 5A at 14.4v. I was super excited to use the Xioxiang app and sure enough the BMS is showing a decent delta. I turned off "Bal. only when charging" within the app.

Should I take it apart and top-balance it or just cycle them a few times?

GP1_BMS.png
 
Last edited:
Davey said:
I finally got my batteries, and I just swapped the BMS with a JBD 120A on one of them. The work was pretty straight forward. The JBD is a tight fit but I was able to get everything in there within appropriate isolation and rub protection. The indentation around the handle makes more difficult.

I fully charged the battery before doing this swap with my Desktop power supply 5A at 14.4v. I was super excited to use the Xioxiang app and sure enough the BMS is showing a decent delta. I turned off "Bal. only when charging" within the app.

Should I take it apart and top-balance it or just cycle them a few times?

View attachment 79331
Click to expand...
I forgot to mention that the existing balance lead connector plugged right into the JBD.
 
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