Chargery BMS now with Low Temp Cutoff
- Thread starter Steve_S
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Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
I'm only trying to share what I learn as I go in order to help answer's other's questions, which are mostly the same questions I had as I started down this "Rabbit Hole".
@grizzzman the update instructions explain it all: http://chargery.com/uploadFiles/Chargery BMS update instructions.pdf
Solarfun4jim
Solar seduced :-)
@Steve_S
Can you offer any guidance on good quality resistors, plus how do you calculate exactly what resistor you need? Is it based on the ratting of the two relays or the expected max continuous amperage or peak amperage?
Picasso mentioned in another post that NTC resistors were thermistors, related to temp, but the chargery manual clearly references these. Can you throw any light on the subject?
See example below as to what im referring to:
Thanks again.
Can you offer any guidance on good quality resistors, plus how do you calculate exactly what resistor you need? Is it based on the ratting of the two relays or the expected max continuous amperage or peak amperage?
Picasso mentioned in another post that NTC resistors were thermistors, related to temp, but the chargery manual clearly references these. Can you throw any light on the subject?
See example below as to what im referring to:
Thanks again.
Digging around the Chargery website, I noticed that this BMS has a connection port for talking to their chargers. But the only charger I could find that has the matching communications port is the C10325, which doesn't support LiFePo4 in a 4s configuration (only 5s-28s).
Am I missing a charger that has this port but supports 4s LiFePo4 packs? If not, is this a necessary feature? I see that their chargers have sense leads, is this instead of the bms sense leads or in addition to? Can I use a different AC charger? If so, do any specific measures need to be taken to make it work correctly with a Chargery BMS?
Am I missing a charger that has this port but supports 4s LiFePo4 packs? If not, is this a necessary feature? I see that their chargers have sense leads, is this instead of the bms sense leads or in addition to? Can I use a different AC charger? If so, do any specific measures need to be taken to make it work correctly with a Chargery BMS?
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
I asked James this same question amongst a few others but unfortunately through the muddle of getting Low Temp cutoff sorted new firmware & docs etc it got forgotten. I just went through the extensive e-mail trail and nope... not there. I suggest you ask James directly e-mail jasonwang3a@163.com if he responds, drop a note in the Thread .
Solarfun4jim
Solar seduced :-)
Thanks steve. I've been trying to find one of Will videos, where he is seen, charging up the caps with a resistor. If i find that, then i'm sure i can work it out from there. I really just depends what amperage is needed, to achieve the charging of the caps over the time allowed. I will keep digging.
I am really starting to lean to this BMS for my pack setup. I like the use of relays for high load circuits and for my needs, having a hard mounted panel is great. If they ever add in BT as an addition to monitoring to the hard display, that would be a bonus. Glad they were able to add the low temp disconnect easily.
Looking forward to hearing more people using these.
Looking forward to hearing more people using these.
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
It now appear that I will be getting 2 more BMS8T's to build 2 more 24v/200AH packs giving me a total of 748 Ahrs total at 24V 17.9 Kwh.
The real trick will be paralleling these with the BMS's, so time for the creative juices to kick in LOL.
The real trick will be paralleling these with the BMS's, so time for the creative juices to kick in LOL.
grizzzman
Photon Vampire
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You running a house?
Solarfun4jim
Solar seduced :-)
Would this work for twin BMS setup?
I was hoping that each BMS16T would provide the details on each individual pack and the 'All in one' unit output the total battery stats plus providing overall control of the charging profile parameters?
If manually shutting down any pack at the 100A breaker, the other pack still has the capacity to fully supply load(Only in emergency situation).
Still learning big time, so please point out any apparent pitfalls, Thanks
I was hoping that each BMS16T would provide the details on each individual pack and the 'All in one' unit output the total battery stats plus providing overall control of the charging profile parameters?
If manually shutting down any pack at the 100A breaker, the other pack still has the capacity to fully supply load(Only in emergency situation).
Still learning big time, so please point out any apparent pitfalls, Thanks
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Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Yes I am running my home, i'm off grid "deep" in the woods near Algonquin Park Ontario.
@Picasso one BMS per pack, you cannot share a BMS with 2 packs. Each pack is a separate & independent entity. You don't; share your living room with your neighbour do you ? such shortcuts will only provide problems, costly ones too.
ghostwriter66
"Here - Hold my Beer"
Which CHARGERY did you get? What were the prices like if you don't mind me asking?
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
I am using BMS8T with Deltec 500A/50mv shunt instead of the supplied 300A/75mv unit. While the relays they supply are pretty heavy duty, I "may" switch them out later depending on how my system evolves with the new stuff coming and how I program my software management system using Modbus (writing it myself - 30 yrs of coding programs) .
ghostwriter66
"Here - Hold my Beer"
Looking at the 600A BMS16T ... I think i will order one to play with it here at work to see if any of the "Factory Smoke" escapes ... We had looked at these in the past and for some reason skipped using them - i have no idea why -- but will give it a shot .. Thx
ghostwriter66
"Here - Hold my Beer"
Just ordered a Chargery BMS16T BMS With 300A Shunt For 2S-16S LiFePo4 LTO with 1.2A Balance SOC and Display for $140.00 delivered .. of course everyone is on Chinese New Year until 01 February so the email response i got said Delivery will be 15 FEB .. thx fine .. plenty of other things to melt around here until then ..
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
I know you'll be happy with it, just read, then re-read, ponder & re-read the docs again, they are slowly being revised for clarity. Forbid to throw in fire.... oivey ! I do recommend getting abetter calibrated shunt, I like the Deltec's as they are bang on always and used by all the major players. For $30 Canadian (I'm a canuck so...) just can't be beat.
The "included" shunts are already pre-calibrated to the BMS in question but if you replace it with another, it will need to be calibrated. Not hard, just a PITA step. Failure to calibrate shunt will force a line drop due to the error code for safety reasons.
PS: Double Sided Velcro makes for easy to secure BMS remote etc.
The "included" shunts are already pre-calibrated to the BMS in question but if you replace it with another, it will need to be calibrated. Not hard, just a PITA step. Failure to calibrate shunt will force a line drop due to the error code for safety reasons.
PS: Double Sided Velcro makes for easy to secure BMS remote etc.
ghostwriter66
"Here - Hold my Beer"
I just watched a video on YOUTUBE on how to calibrate the shunts -- the one that Chargery had sent was 10A off but the clalibration was easy ...
grizzzman
Photon Vampire
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Ya that is posted here some-wear. Thanks
grizzzman
Photon Vampire
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Got a big roll of 3M double sided tape. I had 2 Daly 60 amp BMS stuck to the plastic protector above the battery. Thought I was gonna bust them during removal. Thanks for the info.
Solarfun4jim
Solar seduced :-)
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Well, I did not stick the temp sensor into ice water but I did set the cutoff temp to 10C when the pack was at 9C and it did cut it off. I have set the cut off to 2C.
Solarfun4jim
Solar seduced :-)
Excellent steve, good enough for me....thanks
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