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Overkill Solar BMS official manual 2020-09-17

Overkill Solar official manual for the:
  1. JBD-SP04S020 (4S, 120A)
  2. JBD-SP10S009 (8S, 100A)
I've only gave it a quick glance, but it looks very well put together and detailed! Well beyond the level of quality and clarity of virtually every other commodity BMS.

This is a great asset for the community, one more positive reason Overkill Solar stands out to me as a great seller!
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4.75 star(s) 4 ratings

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A lot of good info on the BMS, but wish much more was covered about app settings.

Between this Overkill BMS manual and my battery cell data sheet, I wish more data was given for the BMS manual recommended app programming. An example is the self discharge of the lithium battery is 3% per month, but the app only lists self discharge%. Without a label in the app, I don’t know if the app want this discharge % in day/month/year. Also, the apps standard settings were not given in the manual, or on the free download, so that leaves a lot for those of us wanting to know the settings beforehand.
This is a fantastic resource. The language and complexity are at just the right level - with my own minimal knowledge and experience, I can understand the content with very high confidence.

The manual mentions a SS enclosure that was available from Overkill, but I don't see it listed on the website. Was that a one-and-done?
The manual is still being revised and updated.
For the most up to date copy, please get it from my website at:
I love it! Great job to Steve for putting this together. I love Overkill Solar. I need to share this on the channel!
I would venture a guess that this BMS may be shaping up to be one of the top options for many of your viewers

1. Pretty Simple, FET based
2. Good US based seller and support
3. Good, intelligible manual
4. All the essentials: Over/Under Voltage, Over current, Low Temp
5. Bluetooth
6. A BMS I think you personally have a good amount of history with (at least as far back as the 'Battery Hookup BMS')
7. Good amount of 'mindshare' / community adoption
8. Not too expensive

Main shortcomings I can think of are limited max current for 12v systems and no 48v option.