KaminoReal

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Total Capacity: 0.00 kWh Location:Posts: 28Threads: 3Joined: Jul 2017Reputation: 0 Total Cells:Total Capacity: 0.00 kWh #1



Some days ago I forgot over night a battery on charger connected without BMS(defective) it was on CV stage (set to max 4.2V/cell) and in the middle of night a big explosion woke me instant, lucky I was home and could eliminate the fire otherwise today I would be homeless... Some days ago I forgot over night a battery on charger connected without BMS(defective) it was on CV stage (set to max 4.2V/cell) and in the middle of night a big explosion woke me instant, lucky I was home and could eliminate the fire otherwise today I would be homeless... Find Reply cristof

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Total Capacity: 0.00 kWh Location:Posts: 117Threads: 17Joined: Sep 2017Reputation: 0 Total Cells:Total Capacity: 0.00 kWh #2 I had the same issue last week. But I was there to stop the probleme. It was not du to overcharge but to a direct short.

The cell has propelled to the ceilling and make a big hole. Hydroélectric 800W PELTON Générator - 6 x 270W solar Panel

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Total Capacity: 88.27 kWh Location: United StatesPosts: 2,262Threads: 424Joined: Oct 2016Reputation: 39 Total Cells: 10080Total Capacity: 88.27 kWh #3 What kind of battery was it? Since you said BMS, I assume it was a few cells in series and one cell got overcharged passed 4.20v? Find Reply hbpowerwall

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Total Capacity: 81.29 kWh Location: Brisbane, AustraliaPosts: 1,871Threads: 110Joined: Oct 2016Reputation: 45 Total Cells: 9505Total Capacity: 81.29 kWh #4 I have to question why people are doing this inside their homes? The focus on safe practices must be our main focus. Glad to see you got to it in time but sad to see it even happen in the first place. Time for everyone to step up their game and learn from the mistakes of others. Kudus to KaminoReal for taking the time to share and educate others! aatheus, BlueSwordM, Jonas Vanbeveren And 6 others like this post Second Life Storage Cell Finder

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Total Capacity: 146.46 kWh Location: Sweden, VäxjöPosts: 5,078Threads: 28Joined: Oct 2016Reputation: 90 Total Cells: 29600Total Capacity: 146.46 kWh #5 Never fun to see. I can say that in RC i have seen many and i say MANY fires over last years where people have charged unattended or in a wrong way. Always balance charge or use proper BMS.



Glad you were there to sort it! Korishan and BlueSwordM like this post NOTE! My links supplied in this message may be affiliated with Ebay and by clicking on them you agree on the terms.

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Total Capacity: 0.00 kWh Location:Posts: 244Threads: 5Joined: Oct 2017Reputation: 3 Total Cells:Total Capacity: 0.00 kWh #6 Funny, I was just watching a video from Jehu and another dude saying you don't need BMS! This topic can be confusing for us newbies.



I've assumed BMS is good for larger installations but not for smaller ones.



I wonder what type of charger you're using. I don't watch my batteries charge either but I only charge/discharge at 500mA and I use an OPUS so it will turn off if it gets too hot. Find Reply Korishan

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Total Capacity: 0.08 kWh Location: Florida, USAPosts: 6,143Threads: 214Joined: Jan 2017Reputation: 76 Total Cells: 10Total Capacity: 0.08 kWh #7 (12-11-2017, 11:14 PM) Oderus420 Wrote: Funny, I was just watching a video from Jehu and another dude saying you don't need BMS! This topic can be confusing for us newbies.

Jehu said in his live feed yesterday (Dec 10, 2017) that a bms doesn't need to be used on new cells. Which, I will mostly agree with. New cells you know pretty much exactly what the condition of all the cells are, as they most likely came outta the same chemical batch; so they are basically clones of each other. On reclaimed cells, a bms is highly recommended due to the uncertainty of the condition of the cells, especially when mixing different types, manufacturers, capacities, brands, etc, etc together into an amalgam of power.



Also, it's not that he was using a defective charger, or a cheap one, or custom, or what ever. The problem came in is that he charged several cells in series without the bms to control the charging. So a cell within the series string went severely over-voltage. That is why you need a bms. Over-voltage is far more troublesome and need of protection far more than under-voltage. Jehu said in his live feed yesterday (Dec 10, 2017) that a bms doesn't need to be used on new cells. Which, I will mostly agree with. New cells you know pretty much exactly what the condition of all the cells are, as they most likely came outta the same chemical batch; so they are basically clones of each other. On reclaimed cells, a bms is highly recommended due to the uncertainty of the condition of the cells, especially when mixing different types, manufacturers, capacities, brands, etc, etc together into an amalgam of power.Also, it's not that he was using a defective charger, or a cheap one, or custom, or what ever. The problem came in is that he charged several cells in series without the bms to control the charging. So a cell within the series string went severely over-voltage.is why you need a bms. Over-voltage is far more troublesome and need of protection far more than under-voltage. owitte, KaminoReal, neurocis like this post Proceed with caution. Knowledge is Power! Literally!

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Total Capacity: 88.27 kWh Location: United StatesPosts: 2,262Threads: 424Joined: Oct 2016Reputation: 39 Total Cells: 10080Total Capacity: 88.27 kWh #8 (12-11-2017, 11:26 PM) Korishan Wrote: (12-11-2017, 11:14 PM) Oderus420 Wrote: Funny, I was just watching a video from Jehu and another dude saying you don't need BMS! This topic can be confusing for us newbies.

Jehu said in his live feed yesterday (Dec 10, 2017) that a bms doesn't need to be used on new cells. Which, I will mostly agree with. New cells you know pretty much exactly what the condition of all the cells are, as they most likely came outta the same chemical batch; so they are basically clones of each other. On reclaimed cells, a bms is highly recommended due to the uncertainty of the condition of the cells, especially when mixing different types, manufacturers, capacities, brands, etc, etc together into an amalgam of power.

So he's suggesting those new cells remain new even 2, 12, 24, 50 months later? When do the cells no longer classify as "new" and need a BMS? Sorry, but that's a dumb remark for him to make. So he's suggesting those new cells remain new even 2, 12, 24, 50 months later? When do the cells no longer classify as "new" and need a BMS? Sorry, but that's a dumb remark for him to make. Find Reply Korishan

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Total Capacity: 0.08 kWh Location: Florida, USAPosts: 6,143Threads: 214Joined: Jan 2017Reputation: 76 Total Cells: 10Total Capacity: 0.08 kWh #9 that's how I understood. Maybe I misunderstood him. It's possible. wouldn't be the first time I misunderstood someone Proceed with caution. Knowledge is Power! Literally!

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Total Capacity: 0.00 kWh Location:Posts: 244Threads: 5Joined: Oct 2017Reputation: 3 Total Cells:Total Capacity: 0.00 kWh #10 Korishan: That's how I understood it as well.



The other guy I watched said to ditch BMS and use a balance charger instead which seems to be the better thing to do as you're not as reliant on some unknown BMS.



Larger project use Batrium which makes sense from a cost perspective but not for smaller batteries like ebike. Find Reply