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custom over/under voltage and over temperature protection circuit
#1
just cooked up the following idea as an alternative to shelling out big bucks for watchmon+longmons as an additional safety mechanism for my nissan leaf powerwall.

i'm not too worried about the pack going out of balance for now so it will not do any balancing. if balancing does become an issue i'll use battery equalizers then.

what do you guys think? bad idea?

already talking with a few chinese circuit developers, hopefully they can do it at an affordable price.

anybody here that can do this with an arduino maybe?

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#2
You can do that with arduino or any other. Resistor divider and some temp sensors... For instance DS18b20 and you are good to go.
Note that the battery balancers you linked are not alot cheaper than actually going with for instance Batrium for that matter any other 100-200 Euro system that does above. So Personally you will not save anything in the long run since you will some day need the balancers (And since you also consider it)


TinyBMS, RecBMS among 2. there is more out there.

Or for instance this one: https://github.com/nseidle/BMS

Not many bucks in material.
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#3
(09-06-2017, 04:09 PM)daromer Wrote: TinyBMS, RecBMS among 2. there is more out there.

thanks buddy... i will look in to those solutions you've mentioned...

cheers!
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