deacon
minor bike philosopher
So I went for the first nihm build of the season today. The batteries came from china. I still don't believe the ah rating so I'm proceeding carefully.
I connected thirty 1.2v c cells using some folded alum foil. I folding it about eight layers to make the connectors. The I taped them to the top of bottom of the cells I used pieces of an inner tube for a tensioner over the connections.
In the end I had 39v more or less and they said 9.5 ah. so after it was all connected I took it out to my shop to an old brushed motor I set up with a controller to run a 36v 300 watts. I figued it would draw 10amps. more or less./
It ran with a lot of resistance for about fifteen minutes wide open. Then it was dragging. So I have the battery on the charger now. I figure it needs about an 80% charge, which will be about 7hrs at 1.5 amps. I have it in the house so I can check the charge every hour or so.
I checked the batteries constantly while they powered the motor and they did not overheat at all. So I think they might allow for a 10amp drain at least. I dont have a 500 watt controller or I would test it with a 15amp draw to see if it will do a 2C.
I'm waiting to see how the charger does, It is going to take a long time to charge it seems. I might have to look into a higher amp charger. A three amp charger would cut the time in half.
At least that is true if my calculations are correct. When I start adding ah to the pack it might prove to be a problem.
I connected thirty 1.2v c cells using some folded alum foil. I folding it about eight layers to make the connectors. The I taped them to the top of bottom of the cells I used pieces of an inner tube for a tensioner over the connections.
In the end I had 39v more or less and they said 9.5 ah. so after it was all connected I took it out to my shop to an old brushed motor I set up with a controller to run a 36v 300 watts. I figued it would draw 10amps. more or less./
It ran with a lot of resistance for about fifteen minutes wide open. Then it was dragging. So I have the battery on the charger now. I figure it needs about an 80% charge, which will be about 7hrs at 1.5 amps. I have it in the house so I can check the charge every hour or so.
I checked the batteries constantly while they powered the motor and they did not overheat at all. So I think they might allow for a 10amp drain at least. I dont have a 500 watt controller or I would test it with a 15amp draw to see if it will do a 2C.
I'm waiting to see how the charger does, It is going to take a long time to charge it seems. I might have to look into a higher amp charger. A three amp charger would cut the time in half.
At least that is true if my calculations are correct. When I start adding ah to the pack it might prove to be a problem.
