Thanks for the idea. I appreciate the response.fechter wrote: ↑Sep 13 2018 8:41amThe Orion BMS looks like a top of the line unit, but $600 would break my budget. A much less expensive option would be to use a "dumb" BMS that handles the cell protection features and wimpy balancing. Then occasionally check the individual cell voltages with a voltmeter to see how well balanced they are.
Thanks. Will research this idea as well. I do not have much expertise in this area but I will certainly review it as an option. Thanks again for the idea.amberwolf wrote: ↑Sep 13 2018 10:17pmIf the problem with cheaper BMS is that they won't handle the output current needed, you could use the gate drive for the insufficient output FET stage to instead drive a bit of electronics (transistor relay driver, etc) that turns a contactor on and off.
Much cheaper than the Orion system.
Yes Sir and thank you. ES has been invaluable as I learn the basics. I can not imagine trying to learn everything needed for a project without the internet.
Thanks for the reply. Am I reading the specs correctly in that this BMS can handle 150-200 amps of continuous discharge current? Thanks again!cricketo wrote: ↑Oct 23 2018 10:06pmYou can still back out of Orion and go with something like TinyBMS. TinyBMS can deal with up to 750A using external contactor, and is much simpler to setup. Way cheaper too
https://www.energusps.com/shop/product/ ... 0a-750a-36
That board can be used with or without external contactor. Without a contactor 150A is the peak, continuous is 60A. With external contactor I think there is essentially no limit, but they specify 750A. On that page there are two example wiring diagrams, one of them (left one) shows the configuration with contactor, which is what you want for your setup.