for putting the batteries on a plane
Possibly automotive blade type fuses. Available in 100 A. Cost a few dollars.
Can't get 100A? Then try two 50A in parallel. Because if one fuse goes, the other dies too due to overload.
View attachment 166891
No, fuses are not rated for "W", they are rated for "I".Do you know of a self resettable 36v fuse with a high 500W rating ? is there such a thing?
Yes I know. I assume there aren't many 3.7v 150A or 200A rated fuses out there?So I chose to discribe the fuse in W ratingHi,
No, fuses are not rated for "W", they are rated for "I".
Klaus
Yep, your Ohms law is wrong!
The fuse does rupture by overheating but its the fuse link resistance 'R' that causes the (I^2 * R) heat that does it, not the voltage. Think of fuses only operating by current, ignore the voltage, at least for low voltage applications like this.
Brian.
If I have 36v made up from 10 x 3.7v battery packs.
These are in series so that the voltage adds up. Total voltage of the set will be 37V. Because they are in series, the same current flows through all the cells in the battery.
If you connect them in parallel, you will get a total voltage of 3.7V but the current capacity will be 10 times. Total current will be divided between the 10 cells. If you are drawing 100A, each cell contributes 10A (assuming they are identical in nature).
In case your cells are in series, you get 37V and you want 10A (total power output will be 370W), but each cell contributes 3.7V but 10A. In series connection, the voltage adds up, not the current.
Oh wait I think your saying the same thing..I have 8x cells in parralel to make 10 x 3.7v battery packs. Let's just see them as battery's that need some short circuit protection
Those battery packs will be in series and monitored with a BMS to make 36v nominal.
If I draw 100 amps at 36v each battery pack contributes 10 amps at 3. 6v or 10 amps at 36v?
Ohms law says there is a big difference?
Surely you have to get the Wats value to get to the 3.7v amp value? Each individual cell is providing 3.7v and not 36v so the amp equivilant changes?
I have 8x cells in parralel to make 10 x 3.7v battery packs. Let's just see them as battery's that need some short circuit protection
Those battery packs will be in series and monitored with a BMS to make 36v nominal.
If I draw 100 amps at 36v each battery pack contributes 10 amps at 3. 6v or 10 amps at 36v?
Ohms law says there is a big difference?
Surely you have to get the Wats value to get to the 3.7v amp value? Each individual cell is providing 3.7v and not 36v so the amp equivilant changes?
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