Joined
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10 Posts
Warning! I've seen posts about reconfiguring a Tesla module using a dremel to cut plates to create 12s 37p. Because only the aluminum plate was being cut and no contact with a cell is likely, he got away with it.
I, however, need to remove 148 cells from the coolant fittings end to make some of the modules shorter—4s 74p. The dremel just nicked one of the cells to be removed and it burst into flames. One cell, no big deal, however, here is the waning. The fire propagated to the next cells. Having the module on a bench, I grabbed it and put it on the concrete floor, while several cells were burning at one end. After it was on the floor, I grabbed a 5-gallon bucket of Lith-X which is a fine powder specifically designed to put out Li fires. It did nothing! As each cell or group of cells blew, they just blew the Lith-X away. It took 90 minutes for all the cells to finally burn out. Some of the cells took off like sky rockets bouncing off of our 14-foot ceiling, and some were like pinwheels as they spun through the air with flame spitting out of both ends. Most were just like Roman candles. I was nervous about the grand finale as the propagation was building until the end. Luckily it didn't get much worse. I have decided that the modules can't be modified. If anyone knows of a way to safely remove parts of the module, I'd love to hear about it, but probably won't be using Tesla modules.
I found a source for LiFePO4 18650 cells. I'll lose a lot of range, but won't have to sweat the power, as they can put out 30A and I can only use 27A with cells at 108s 75p with the 2000A Zilla controller. Stay safe. I feel very lucky.
I, however, need to remove 148 cells from the coolant fittings end to make some of the modules shorter—4s 74p. The dremel just nicked one of the cells to be removed and it burst into flames. One cell, no big deal, however, here is the waning. The fire propagated to the next cells. Having the module on a bench, I grabbed it and put it on the concrete floor, while several cells were burning at one end. After it was on the floor, I grabbed a 5-gallon bucket of Lith-X which is a fine powder specifically designed to put out Li fires. It did nothing! As each cell or group of cells blew, they just blew the Lith-X away. It took 90 minutes for all the cells to finally burn out. Some of the cells took off like sky rockets bouncing off of our 14-foot ceiling, and some were like pinwheels as they spun through the air with flame spitting out of both ends. Most were just like Roman candles. I was nervous about the grand finale as the propagation was building until the end. Luckily it didn't get much worse. I have decided that the modules can't be modified. If anyone knows of a way to safely remove parts of the module, I'd love to hear about it, but probably won't be using Tesla modules.
I found a source for LiFePO4 18650 cells. I'll lose a lot of range, but won't have to sweat the power, as they can put out 30A and I can only use 27A with cells at 108s 75p with the 2000A Zilla controller. Stay safe. I feel very lucky.