D
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hello, i have a 98 mitsubishi eclipse which has a forklift motor in it. but no batteries, motor controller or electronics.
I have been collecting 18650 cells for months and have about 1000, which i am going through and testing.
Now i did a bit of math, estimating my batteries need to be able to provide400Amps and so i will need at least 80 cells in parallel. my motor controller claims a 300A max, but i think headroom would be good and create less strain on the batteries.
Voltage can be whatever i want it to be, my motor controller which is on the way,claims to have a working voltage between 25-200volts. To havespeed and acceleration i am thinking i should shoot for near 120v. Which would mean i need 32 cells in series. so i need at least 2560 cells minimum to have a completed car battery.
Assuming all these cells are usable to 2AH. i would have 18,944Watt Hours. unless i did my math wrong. That would give me a 120Volt 160AH battery right?
assuming i can get 1 mile per 300WH, i could about 63 miles on a full charge.
253Lbs of batteries alone without holders/wire/ect.
While this doesn't sound too bad to me, I am still far from having that many cells which are all clean and healthy. And the computer stores i have been getting my cells from are wanting to charge me between $1-3 per laptop battery. i would say on average each battery has between 6-9 cells. so i would have to spend about $1000. to get the rest of the laptop batteries i need, assuming most of the cells are good.
I have been following jehugarcia on youtubeand he reccomended these batterieshttps://us2.campaign-archive.com/?e=&u=e0622e44428987d22191af56c&id=f8a253f520
for the price it appears to be adeal. Except for the AH rating, at 60AH they are much smaller than the 160AH i would have with 80x18650 in parallel.
The problem with that approach is the minimum order quantity is 9 batteries, + freight/S&H $1785. per 9 batteries, Unless i want to use this car for very short distances i would need more capacity. So to get more AH than the 18650 cellsi would need 21 batteries in a 7s3p configuration. And3 pallets = $5355.
and because each battery is about the size of a small car battery, i might run into the issue of how to fit 21 ofthem into the car. Also, they would weigh approx 518Lbs. for 23,100WH
And, maybe just as problematic is they don't listspecific information about the workingvoltage range of each battery. and they do not have built in BMS or protection, so i would still need to come up with some way to charge them.
So right now, the 18650 appears to be the more affordable option. At least if i stick with lithium cells.
But there is also the big complication of how will i charge and balance all of these cells.
i have been looking around hoping to find some kind of DIY balancing circuit that could handle something like this with no luck.
any suggestions?
I have been collecting 18650 cells for months and have about 1000, which i am going through and testing.
Now i did a bit of math, estimating my batteries need to be able to provide400Amps and so i will need at least 80 cells in parallel. my motor controller claims a 300A max, but i think headroom would be good and create less strain on the batteries.
Voltage can be whatever i want it to be, my motor controller which is on the way,claims to have a working voltage between 25-200volts. To havespeed and acceleration i am thinking i should shoot for near 120v. Which would mean i need 32 cells in series. so i need at least 2560 cells minimum to have a completed car battery.
Assuming all these cells are usable to 2AH. i would have 18,944Watt Hours. unless i did my math wrong. That would give me a 120Volt 160AH battery right?
assuming i can get 1 mile per 300WH, i could about 63 miles on a full charge.
253Lbs of batteries alone without holders/wire/ect.
While this doesn't sound too bad to me, I am still far from having that many cells which are all clean and healthy. And the computer stores i have been getting my cells from are wanting to charge me between $1-3 per laptop battery. i would say on average each battery has between 6-9 cells. so i would have to spend about $1000. to get the rest of the laptop batteries i need, assuming most of the cells are good.
I have been following jehugarcia on youtubeand he reccomended these batterieshttps://us2.campaign-archive.com/?e=&u=e0622e44428987d22191af56c&id=f8a253f520
for the price it appears to be adeal. Except for the AH rating, at 60AH they are much smaller than the 160AH i would have with 80x18650 in parallel.
The problem with that approach is the minimum order quantity is 9 batteries, + freight/S&H $1785. per 9 batteries, Unless i want to use this car for very short distances i would need more capacity. So to get more AH than the 18650 cellsi would need 21 batteries in a 7s3p configuration. And3 pallets = $5355.
and because each battery is about the size of a small car battery, i might run into the issue of how to fit 21 ofthem into the car. Also, they would weigh approx 518Lbs. for 23,100WH
And, maybe just as problematic is they don't listspecific information about the workingvoltage range of each battery. and they do not have built in BMS or protection, so i would still need to come up with some way to charge them.
So right now, the 18650 appears to be the more affordable option. At least if i stick with lithium cells.
But there is also the big complication of how will i charge and balance all of these cells.
i have been looking around hoping to find some kind of DIY balancing circuit that could handle something like this with no luck.
any suggestions?