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Battery Disconnect - Latching Relays
#11
(01-24-2019, 06:45 AM)Mikethezipper Wrote: Ahh, I see now. Thanks for the heads up, yeah looks like I can probably get one around the $60 range.

Just wondering - Since I'm also working on a BMS - are most of these tripped by 24VDC? Is that a standard trip voltage for these breakers?

The ABB I bought has a 24v trip coil. There are a few different voltages available for the trip coil, 24v is a standard one. Make sure you check the trip voltage before you buy to make sure it has the coil you want.
#18650
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#12
There are some BMS systems out there that can control or feed data to a charger to make sure it ramps down when needed like when a cell gets full. batrium can do that towards some systems.
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#13
I'm looking for remotely controlled cell-level (1S) cutoff relays / contactors, 3-4V range (LFP)

NO, ideally very unlikely to fail closed, easily withstand continuous 6-10A at a minimum.

Later on will need higher ampacities, even 100+A.

Does the lower Voltage make them cheaper than cutting off at the bank / pack level?

Don't think I can use CBs, will need to flip open / closed by a central controller, Arduino, rPi driven maybe PLC?

Any suggestions welcome, TIA
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#14
No they wont be cheaper at 4V compare to 24 or 48 in my world. No matter if you break in middle of pack or jus tbefore the inverter you will have the same voltage.
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#15
I'm asking for links to recommended relays given the specs above, will need many dozens, perhaps to be controlled by Arduino and/ rPi?

Don't mind cheap Chinese, long as I know the relationship between the published contactor-current rating and what they can **actually** handle safely.

But obviously known-good brands with accurate and detaile spec sheets would be better, long as they don't cost 10x the above?
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#16
Disconnect ones Schneider or ABB ones. They can do many 100s of A. Cheap? Hell no...

Up to 25A you can get normal contactors from almost anywhere i would say. Dont have many links at hand since im not sure what exactly you look for. Its a rather wide range you look for....
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#17
(02-20-2019, 11:06 PM)daromer Wrote: Dont have many links at hand since im not sure what exactly you look for. Its a rather wide range you look for....
Problem is I don't know enough myself to give any more requirements. What sort of questions would help narrow things down?

And of course, looking for suggestions from anyone reading the thread.
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