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Old 07-02-2018, 11:52 PM   #81
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2p4s? Or 4p2s don't forget fuses in each string unless those wires can withstand 60 amp..

Later j
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Old 07-03-2018, 03:34 AM   #82
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2p4s? Or 4p2s don't forget fuses in each string unless those wires can withstand 60 amp..

Later j
Oops, you are right. The panel configuration will be 2S4P, and yes, each of the four strings will have a 30A fuse. Otherwise, it looks okay? Thanks again for your help Joe.
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Old 10-31-2018, 11:34 AM   #83
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So... November will mark six months that the battery pack has been operational in the garage. I am still not pushing the pack very hard; still just running the garage fridge, occasional power tools and shop vac. I have had zero issues with the pack, inverter, BMS units, or any other part of the system.

Here in the next few weeks, I hope to get my solar panel mounting hardware and roof "real estate" plan finalized. I am also currently finalizing the interior mounting scheme for the indoor mini split unit.

If only I hadn't been so "bus lazy" this summer I could have done some spray foam, and even installed the wood stove. I could have had a nice warm bus to work in this winter. Maybe it's not too late...
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Old 10-31-2018, 11:37 AM   #84
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You're definitely "going the distance".
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Old 10-31-2018, 11:42 AM   #85
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You're definitely "going the distance".
Nice... I wonder how many folks will "get" your comment.
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Old 11-06-2018, 04:30 PM   #86
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Nice... I wonder how many folks will "get" your comment.
He's going for speed.
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Old 12-06-2018, 08:34 PM   #87
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How are you liking the BMS unit? How does it compare to packs that were not under the BMS? Notice any difference? I have a few Volt 2KW packs (44v) and was thinking about hooking up 3 to one a BMS as a test. Thanks
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Old 12-07-2018, 06:21 AM   #88
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How are you liking the BMS unit? How does it compare to packs that were not under the BMS? Notice any difference? I have a few Volt 2KW packs (44v) and was thinking about hooking up 3 to one a BMS as a test. Thanks
Those BMS units are fantastic, and I strongly recommend them for your Volt batteries. I recently ordered a 5th BMS and BT dongle to keep as a spare. I have had no problems with the 4 units I am running but I wanted to have a spare available...

Rick's disclaimer: The battery pack is in daily use but generally only under light loads, and I charge the pack thru the Magnum inverter (no solar yet).

The BT dongle and App can be a bit quirky sometimes, but cycling the phone's BT off-on is the most I've had to do. Having the phone app is IMO the only way to go. It provides excellent monitoring capability, and the ability to set key parameters.

I have the BMS units set to balance the cells to 0.02V, and have seen the BMS actively balance cells within a batt (rarely...). I have tested the BMS's ability to protect cells from overcharging, as well as shut the packs down for under voltage. All 4 units are performing as they should.

Regarding your other questions, running any Lithium battery pack without a BMS is like playing Russian Roulette... The batteries really should be managed at the cell level. A 12S pack may be at 44V, but if one of those 12 cells is at 3V and another is at 5V, that would be bad...

Based on my research and my own experience, Chevy Volt batteries tend to stay well balanced, however, while the risk of an imbalance may be low, the consequences of an imbalance are too high to accept that risk.
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Old 12-07-2018, 07:42 AM   #89
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Thanks for your feedback. In general this thread has really helped out with my project.

As for the number of packs being monitored by a single BMS. How well does that work or maybe the question is how does it work..? Appears you have both monitoring wires tying into the BMS lead wire? Does the BMS just take the average of the two cells from the respective packs being monitored? Could you save on the number of BMSs needed if you tied more cells from packs like 3 or 4? Or does that increase the risk or effectiveness of the balance function?

Also I was looking as the solder wire connectors between the BMS and the Volt BMS wire.
Something like this: https://www.amazon.com/Sopoby-Connec...nk+with+solder

What is the connector that you used? I couldn't figure it out from the pictures.

Thanks again
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Old 12-07-2018, 08:03 AM   #90
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Thanks for the info. This thread has been really helpful in my own battery bank setup.

Couple of follow-up questions.

On the number of cells being monitored by a single BMS how well does that work or maybe I should ask how does it work? Does it take the average of the two cells that are connected to the BMS wire? I take it you could hook up as many as you want but would lose the balance accuracy and the effectiveness of the BMS in being able to balance being limited by the charge limit?

Also what are the connectors that you are using between the BMS wire and Volt BMS wire, it appears to be a crimp connector..?.?

Thanks again!
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