question

rodney-abbott-buchanan avatar image
rodney-abbott-buchanan asked

BMS 12/200 Max fuse spec

On the recent Blog post, Jono shows the BMS 12/200 with a 200amp fuse across AB. Victron spec sheets indicate 100amp fuse maximum. I do not have enough info on how or why this is OK @Jono (Victron Energy Staff)

BMSfuses
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3 Answers
Johannes Boonstra (Victron Energy Staff) avatar image
Johannes Boonstra (Victron Energy Staff) answered ·

On the AB side the maximal current is 80A (which means the maximal fuse to put in there is 100A). Putting a larger one on that side will not result in extra charge current.

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Sam Salwei avatar image
Sam Salwei answered ·

So how does this work then? https://www.victronenergy.com/blog/2019/10/07/careful-alternator-charging-lithium/ he uses a 200amp fuse in the video https://youtu.be/ZyIJRjJtCR0.

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lazy-bones avatar image
lazy-bones answered ·

I think the starter battery is making up the amperage over 80A. The BMS 12/200 can pull from the starter battery if its voltage is over 13V. This explains why Jono's charge time is longer with the BMS.

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Related Resources

Victron VE.Bus BMS product page

Victron 3rd party BMS compatibility page

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