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149 Posts
my problem with that is that 2 packs only give me 5ah which would be less than 10mion of ride time. I get 15min with my 7ah TOPs right now. $50 in lead or $400 in lipo,
Ohms low states: The total current is equal to the sum of the individual branch currents.
Therefore if the battery is 5000mA each, 2 in parallel would be 2X5000mA, which is 10A. The total cost of the batteries is $200.00 for 4 batteries. These will also function like a 12 A/h pb battery.
I get 15min with my 7ah TOPs right now.
15 min on 7 A/h? I think you better check your batteries.
$50 in lead or $400 in lipo, they are more powerful, but they will drain quicker...then you run a risk of over draining them, which is less of a problem for lipo than lead. You can drain lipos more than lead, you can charge lead more than lipo.
$100 in lipo, not $400. They will not drain quicker. They have a denser energy and more capactiy the lead acid. Draining Lipo is MORE dangerous then draining Pb batteries. Pb can be dropped to 80% Capacity. Lipo's should never get under 85%.
If 1 lipo cell is out of balance...FIRE even with bms boards charging is not full proof.
If one lipo cell is out of balance it will not cause a fire unless its voltage goes under 85% or 3V per cell. When you charge you need a balance charger. they cost about 20 bucks new for a 5-6A version and they will charge every type of battery including PB.
I wish I wasn't so sketched out by lipo. I have a couple plane and choppers, 1 of my 11.1v got super puffy after I used it to power some led lights on my bike. made me mad!
You dropped the cells below 3V plain and simple. Lucky you did have them explode or catch fire. Most lipo's will just "puff" when there undervolted. Keep them above 3V per cell, 3.2 is better for battery life.
I am interested in kelly! I was thinking of going to 3 big amp hour batts with a 100a kelly.
Check your batteries. I have 3 17 A/h batts in my sons bike before the lipo's. The kelly controller is affordable and has over-current and most importantly programmable low voltage shutoff.
currently I'm running 48v 7ah on a 36v 650watt motor. thinking of running 3 18ah on the motor.
Good luck fitting 4 of them in there. With 3 17 A/h batteries I was able to run for about 30-40 minutes on a 750W PM DC motor.
I think the more powerful controller would open the motor up without over heating. I can get a 100a 36v kelly for $60
More amps, more heat, the motor will get hotter. The controller will protect it. I have a device that restrict current of temperature gets too high. Go with the 24-48V version. it opens the doors for future upgrades.
.Thinking even just 3 14ah. Gotta stick with lead for now. 1 14ah high rate batt is like $36! not bad at all.
I use 10AWG on anything below 100A. Remember gauge becomes less of a factor because we have suck a short length of wire. The reason for going larger diameter wire is to reduce resistance. In any case, bigger is better in regards to wire.
Could you send me some links for installed kelly pics? would like to see the wire connectors. I usually use 12ga wire. I don't want to go with 8ga, but I feel it's time for 10gauge.
This is the controller I am using on my sons little Razor scooter I am building. Schematic is on page 10/17. Displaying picture would really be useless because you cannot see all the connections.
http://kellycontroller.com/mot/downloads/KellyKDUserManual.pdf
Ohms low states: The total current is equal to the sum of the individual branch currents.
Therefore if the battery is 5000mA each, 2 in parallel would be 2X5000mA, which is 10A. The total cost of the batteries is $200.00 for 4 batteries. These will also function like a 12 A/h pb battery.
I get 15min with my 7ah TOPs right now.
15 min on 7 A/h? I think you better check your batteries.
$50 in lead or $400 in lipo, they are more powerful, but they will drain quicker...then you run a risk of over draining them, which is less of a problem for lipo than lead. You can drain lipos more than lead, you can charge lead more than lipo.
$100 in lipo, not $400. They will not drain quicker. They have a denser energy and more capactiy the lead acid. Draining Lipo is MORE dangerous then draining Pb batteries. Pb can be dropped to 80% Capacity. Lipo's should never get under 85%.
If 1 lipo cell is out of balance...FIRE even with bms boards charging is not full proof.
If one lipo cell is out of balance it will not cause a fire unless its voltage goes under 85% or 3V per cell. When you charge you need a balance charger. they cost about 20 bucks new for a 5-6A version and they will charge every type of battery including PB.
I wish I wasn't so sketched out by lipo. I have a couple plane and choppers, 1 of my 11.1v got super puffy after I used it to power some led lights on my bike. made me mad!
You dropped the cells below 3V plain and simple. Lucky you did have them explode or catch fire. Most lipo's will just "puff" when there undervolted. Keep them above 3V per cell, 3.2 is better for battery life.
I am interested in kelly! I was thinking of going to 3 big amp hour batts with a 100a kelly.
Check your batteries. I have 3 17 A/h batts in my sons bike before the lipo's. The kelly controller is affordable and has over-current and most importantly programmable low voltage shutoff.
currently I'm running 48v 7ah on a 36v 650watt motor. thinking of running 3 18ah on the motor.
Good luck fitting 4 of them in there. With 3 17 A/h batteries I was able to run for about 30-40 minutes on a 750W PM DC motor.
I think the more powerful controller would open the motor up without over heating. I can get a 100a 36v kelly for $60
More amps, more heat, the motor will get hotter. The controller will protect it. I have a device that restrict current of temperature gets too high. Go with the 24-48V version. it opens the doors for future upgrades.
.Thinking even just 3 14ah. Gotta stick with lead for now. 1 14ah high rate batt is like $36! not bad at all.
I use 10AWG on anything below 100A. Remember gauge becomes less of a factor because we have suck a short length of wire. The reason for going larger diameter wire is to reduce resistance. In any case, bigger is better in regards to wire.
Could you send me some links for installed kelly pics? would like to see the wire connectors. I usually use 12ga wire. I don't want to go with 8ga, but I feel it's time for 10gauge.
This is the controller I am using on my sons little Razor scooter I am building. Schematic is on page 10/17. Displaying picture would really be useless because you cannot see all the connections.
http://kellycontroller.com/mot/downloads/KellyKDUserManual.pdf