Johannlog
The sun shines even on cold days
- Joined
- Apr 28, 2021
- Messages
- 99
That's it! Thanks so much. It was at 250a I set it to 300a
Chargery BMS, DCC (Solid State Contactor) thread.
- Thread starter Steve_S
- Start date
Does anyone know if Chargery is still selling these?
I've tried purchasing via Chargery store, and the shopping cart is broken at the last step when paying.
I've also emailed Jason multiple times without any response over the past several days.
I've tried purchasing via Chargery store, and the shopping cart is broken at the last step when paying.
I've also emailed Jason multiple times without any response over the past several days.
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
It is Chinese New Year and many are shutdown too as well due to Omicron BA.2 Variant, plus Olympics cause some issues in some places.
Try their Alibaba outlet: https://chargery.en.alibaba.com
There is some sort of Certificate issue with ChargeryStore.
Try their Alibaba outlet: https://chargery.en.alibaba.com
There is some sort of Certificate issue with ChargeryStore.
Thanks. I guess I would expect a business owner to at least set a vacation responder on his email if he's not going to be able to check respond to emails for weeks at a time.
I just checked their Alibaba store, and they have a minimum order qty of 2 at that store.
Maybe I could find a use for 2 of them... but that's kind of frustrating to be forced to buy two when I only need one.
Also makes me question the support I would get if there was a problem. Maybe I'm better off just going with a regular coil contactor with a high amperage diode to allow charge current with the contactor off.
jasonhc73
Cat herder, and dog toy tosser.
I have 4. If you want one or four, I don't use the one I have installed, and never installed three.
Capt Bill
Sailing Options
I have the Chargery BMS8T set up on a my 24v 8S 280 AH EVE LiFePO4 Battery. I am getting ready to update to 24v x 16 cells for twice the AHs. I realize I could parallel two 8S 24 battery set with two Chargery BMS8Ts monitoring each 24v set; but recently leaning to go with a 2P8S setup where I parallel two 3.2v cells to 6.4v double cells, and then series each set of two into 2P8S. ... and just use one Chargery BMS8T. Question: Would the proper adjustment in BMS setting be take single cell voltages and double them? plus double the AH and WH settings ? I would leave max charge and discharge settings the same. ... I plan on running each set of 8S cells through some full paced charge and discharge cycles to make sure each cell looks up to par before hooking em all up in 2P8S configuration. I made a screen shot of my current Chargery BMS settings for my current 8S 24V 280Ah set up that shows my current settings along side changes I think are appropriate for change to 2P8S ... and twice the Ahs. I am inviting any Comments, Suggestions, or Considerations for our group forum lessons, and my own. :+) Bill
Capt Bill
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Let me figure out what I got wrong, or ? ... Glad I got this forum to bounce off of. I was just searching for battery configuration pictures next ... to get clear on what I am doing. Thanks ;+)
I just misread your post. You are going from 8s1p 24v system to 8s2p system. The watt hours and amp hours will need to be adjusted.
Make sure you tie each pair of batteries together in parallel. Then connect the 8 pairs you have in series to make a 24v battery.
Do NOT connect 8cells in series with 8 other cells in series if running one bms Make sure that each pair of cells are in parallel first then all in series.
Capt Bill
Sailing Options
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Paralleling cells within a pack does NOT increase its voltage only its Amp Hours.
280AH cells are still 280AH cells, when in parallel they are considered 560AH BUT still subject to 2.500-3.650 Voltage limits.
You are STILL limited to 0.5C Charge rate Max of 140A. They are also STILL Limited to 1C 280A Max Output which is best capped to 250A.
See inside spoiler below.
FOR REFERENCE !
280AH cells are still 280AH cells, when in parallel they are considered 560AH BUT still subject to 2.500-3.650 Voltage limits.
You are STILL limited to 0.5C Charge rate Max of 140A. They are also STILL Limited to 1C 280A Max Output which is best capped to 250A.
See inside spoiler below.
Setting | Default | My settings | NOTES |
Over charge P Voltage | 3.65 | 3.65 | |
Over charge R Voltage | 3.55 | 3.55 | |
Over charge Current | 50 | 86A / 150A | 0.5C rate for 174AH / 280AH |
Over Discharge P Voltage | 3.00 | 2.65 | CUTOFF Trigger |
Over Discharge R Voltage | 2.00 | 2.75 | Release @ this V. |
Over Discharge Current | 300 | 175A / 250A | 1.0C Rate for 174AH / 280AH |
Low SOC cutoff | 20% | 0% | forces cutoff @ % (faulty) |
High Temp cutoff | 50C | 70C | |
Diff of Batt Temp | 10 | 15C | |
Diff of cell Voltage | 30mv | 200mv | Unmatched cells drift, |
Temp Unit | C | C | |
Key Beeper | ON | ON | |
LCD Backlight | 10 | 10min | |
Cut off Delay Time | 10 | 10S | |
Current Calibration | | -SET- | |
Temp Alarm | ON | ON | |
Cell Empty Voltage | 2.50 | 2.50 | |
Cell Full Voltage | 4.20? | 3.65 | |
Default Setting | | Enable | |
Balance Parameter | | -SET- (OFF)* | Passive is ON charge only, start at 3.40V, 30mv diff. |
Battery Capacity AH | 1 | 174 | 280 | Label Value of cells |
Battery Power WH | 1000 | 4554 | 7168 | FORMULA (NominalVolts * #ofCells * RatedAH) (3.2*8*280=7168) |
Low Temp cut off in Charge | 2C | 2C | |
Low Temp cut off in Discharge | -10 | -10C | |
FOR REFERENCE !
Capt Bill
Sailing Options
Thanks for the pictures. ;+) ... Now Wondering: Would you think the BMS8T loom wires to battery OK on either set of positive battery terminals, or better on closest to main positive of whole battery bank, and then last on most distant negative battery terminal? opinions welcome ;+)
Last edited:
I mounted my voltage sensing wires in the center of each buss bar. Of course the first and last cells have wires right on the battery terminal. What I didn't want was the voltage drop on the bus bar being attributed to a given cell... so I split the difference between the cells by putting the wire right in the middle. For the main pos and main neg, I crimped a small 18ga wire into the big lugs and then soldered with a gas torch.
OffGridICF
New Member
- Joined
- Aug 5, 2021
- Messages
- 41
Hi @Johannlog,
Here's a cautionary tale involving two parallel Chargery DCC-300s and a 240V / 3HP table saw. It was very cold so the belts were stiff and would not allow the saw to start. I immediately switched it back off and rotated the blade by hand to loosen the belts. When I tried to start it again, it spun briefly then stopped. When I got to the battery room I found our first power failure in over 5 years. All the pixies had escaped from something and the burnt electronics smell was overpowering. Initially I was worried about the 15 year old Schneider XW6048 inverter. Fortunately, it was OK. The Chargery BMS displays were working but that was all. They had both tripped off on over current, just like you experienced. I power cycled them and only one DCC came back on, the other was fried. The system is 48V with 2 parallel 16s packs of 280AH cells, each with its own BMS.
When the saw would not start, I suspect only one of the two parallel 48V packs tripped offline on an over current fault. When I tried to start the saw again, the other pack tripped offline and the DCC was destroyed. Again, only a suspicion, but the transistors probably exploded trying to break the circuit under far more than a 300A load. Fortunately, I had a spare and was back up and running in about 10 minutes.
So far, I have not been able to disassemble the DCC-300 to check the part numbers and order replacement transistors. There is a giant slab of copper that is at least partially soldered to the PCB that must be removed to access them. My heavy duty soldering gun is useless so I'll try a heat gun next. It's a clever design, but not easily repaired.
Capt Bill
Sailing Options
Appreciate the diagram and support: Re Your "You are STILL limited to 0.5C Charge rate Max of 140A. They are also STILL Limited to 1C 280A Max Output which is best capped to 250A." ... I would like to point out; Re-examining the data spec sheet I got when I purchased my 1st set of EVE LifePo4s a couple years ago; for LF280 (3.2V 280Ah) Product Specification Version E Page 2/11 File No. LF280-72174 ; it does say "Max Charge Current: 1C (which I believe = 280 Amps); Cut-off voltage: 3.65v" ...Then for Discharge Current: 1C ; Cut-off voltage 2.5V" I have always thought that was a high figure. ... That is why I configured 260 Amp Max for both Charge and Discharge at my BMS. I will adjust both those figures down to 250A at BMS, (unless you can give me info. to counter my charge side spec data). I will also make sure my solar charging is set to max out at 150A ... Thanks ;+)
Capt Bill
Sailing Options
I do have two Chargery BMS8Ts here as I consider my battery update to twice the amp/hours. Re: Pros and cons ... on Pros side for 8S x 2P configuration with two BMSs and two LCD displays, ... I could monitor each and every battery cell separately. They are in my opinion Grade B cells that could go wonky one at a time over time; so I like that advantage. I do have several used low amp draw 500 A rated killovac relays I could hook up to each 24v volt battery bank, ... if I go this way. I could have a relay for each set of 24 v battery banks; OR (my preference)... I could use a couple of SSR connected to my two different BMS trigger circuits ... to make closed circuit on one main battery relay, to release when either BMS triggered a fault. After watching Will's recent Youtube video of paralleling LiFePO4s, I would use equal length bus bars to parrallel my two 8S 24v battery bank sets. ... Question: If you had these options ... One BMS on 2P8S config ... or Two BMSs on a 8S 2P config ... Which would you choose and why? What pros and cons might I be missing ?
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
EVE info below and that time frame those were the specs as shown, things have had updates along with the cells, other manufacturers specs vary as well.
The 1-C Discharge Max & 0.5C Charge max is maximized service life and to comply with the majority of BMS' & related componentry. Consider the prebuilts even the "Server" rackmounts (which are really telecom packs) spec maxes .5C charge and 1C discharge.
If you wish to push them to edge but then consider the increased degredation.
The 1-C Discharge Max & 0.5C Charge max is maximized service life and to comply with the majority of BMS' & related componentry. Consider the prebuilts even the "Server" rackmounts (which are really telecom packs) spec maxes .5C charge and 1C discharge.
If you wish to push them to edge but then consider the increased degredation.
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
BTW, My Chargery Bank, 24V 8S packs with BMS8T-300 & DCC-300.
Capt Bill
Sailing Options
Thanks Steve ... I will go with this new info ... Thanks for heads up
