BMS24T lithium battery management system

This is about what I would expect to see in a lithium BMS for large cells. 1.2A of balancing. Apparently about $400. Any thoughts?
http://www.chargery.com/doc/Chargery_BMS24T_specification_V1.13.pdf
http://www.chargery.com/doc/Chargery_BMS24T_specification_V1.13.pdf
I am available for custom hardware/firmware development
Comments
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
So not relevant to the BMS24T, but do good MPPT chargers actually die or start fires when batteries are disconnected while charging? I have a bunch of non-solar chargers, power supplies and DC-DC converters that aren't bothered by such things.
I am available for custom hardware/firmware development
Just never park the electric car in the garage and the folks at the above will be there to help.
You are not talking about using this with a home solar battery based system right?
http://members.sti.net/offgridsolar/
E-mail [email protected]
Only issue I have with the Chargery unit is there doesn't seem to be any way to be able to monitor your battery remotely via computer/phone or the internet.
Simon
32x90Ah Winston cells 2p16s (48V), MPP Solar PIP5048MS 5kW Inverter/80A MPPT controller/60A charger, 1900W of Solar Panels
modified BMS based on TI bq769x0 cell monitors.
Homemade overall system monitoring and power management https://github.com/simat/BatteryMonitor
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
You can also manually shut down the charger from SCP, or Combox. It is a nice slow shut-down and start-up. Much better than banging the in/out breakers.
http://members.sti.net/offgridsolar/
E-mail [email protected]
Outback calls it something different but it does the same thing. A few clients have needed this to get a certificate of occupancy.
http://members.sti.net/offgridsolar/
E-mail [email protected]
Based on another discussion, it looks like @mcgivor uses a similar model (perhaps BMS16). No fires?
I am available for custom hardware/firmware development
It is all balance of requirements. Electronics and their failure modes need to be addressed. A fairly non-smart lead acid battery just does not have that extra layer of failure that a lithium battery and its electronics have. If that is not a problem then it is addressed.
For someone offgrid who does not want to lose power ever, they will need a second independant battery system or be able to get one in a reasonable amount of time. Like going to Costco for an emergency bank of golf cart batteries which I have done for a few clients near me.
My point is adding electronics to a battery is an extra source of failure that was not there before. Fire for any type of batteries can happen. It is pretty rare with a reasonable amount design skill and maintenance. You need to watch a lithium battery a bit more than once a month like a flooded😉
http://members.sti.net/offgridsolar/
E-mail [email protected]
Would you say that kind of setup presents the same kind of “source of error” concerns we’d get by introducing a BMS to a lithium bank as an add on?
The banks with integrated BMSs are advertised as a plug, play and forget storage solution, but would it really be that hands off?
Magnum Energy ms4448PAE inverter/power center
Magnum BMK
Dual Midnite Solar Classic 150s
Midnite WhizBang Jr & shunt
16 kwh Chevy Volt EV lithium ion
48v system
It is hands off until there is a failure in the bms or battery. With multiple battery and bms you reduce the chance of losing power.
Some folks do not mind losing power but many like the peace of mind of a second system completely backed up to a second or third inverter/charger.
Your chevy volt battery could be made that way with multiple BMS controlling sections of the volt battery to get a second or 3rd battery system.
http://members.sti.net/offgridsolar/
E-mail [email protected]
I’m still trying to gauge how safe and hands off I can make the Volt batteries I found these BMSs made specifically for the LG-produced Volt batteries for each of the 8 batteries I have: https://www.ebay.com/itm/BMS-for-48v-Chevy-VOLT-battery-w-LCD-display-capacity-voltage-w-cell-balancing/183400034288?hash=item2ab37e6ff0:g:9hYAAOSwBrBbgsJB ). Practically, I need a energy storage system that I can walk away from for 2-3 weeks (or even months) while traveling for work. If my Volt batteries all have BMSs and my Classics are programmed for emergency shutdown, what other risks do I face with this setup? Are there additional system design considerations I can include to make these set it and forget it, or is that just not going to happen?
Ps - just checked 12 cells in each of the 8 Volt batteries today and they are all within one hundredth of a Volt of each other. All 96 cells are either 3.78 or 3.79v.
Magnum Energy ms4448PAE inverter/power center
Magnum BMK
Dual Midnite Solar Classic 150s
Midnite WhizBang Jr & shunt
16 kwh Chevy Volt EV lithium ion
48v system
With lithium cells you need to measure in thousands of a volt, if you don't have an accurate meter with such resolution you will need one, there is a big difference in the thousands of a volt, for the most part my cell are < 20 mV apart, the accuracy of the meter has to be taken into consideration, even with two identical Fluke 179's there is a couple of milivolts difference.
The BMS linked is not something I would recommend, it is an analog device, no control of charge or discharge current, is of unknown origin without a warranty at 3 times the cost of one which dose all the above and more, is digital, from a company that backs up their equipment with a warranty.
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
I’ll get a more accurate meter, and scrap the analog BMS.
Magnum Energy ms4448PAE inverter/power center
Magnum BMK
Dual Midnite Solar Classic 150s
Midnite WhizBang Jr & shunt
16 kwh Chevy Volt EV lithium ion
48v system