Enough voltage to hurt and make really big sparks.new2thiss said:Just wondering what two 60v 20ah lifepo4 batteries connected in series would equal?
Very carefully, and by reading about all the many threads on putting batteries in series.And how would I go about doing it?
Not curious enough to read about what others have already done, I'm guessing. :/Clearly beginning to form an addiction here lol nevertheless I'm curious!
amberwolf said:Enough voltage to hurt and make really big sparks.new2thiss said:Just wondering what two 60v 20ah lifepo4 batteries connected in series would equal?
Very carefully, and by reading about all the many threads on putting batteries in series.And how would I go about doing it?
Not curious enough to read about what others have already done, I'm guessing. :/Clearly beginning to form an addiction here lol nevertheless I'm curious!
dogman dan said:Doubling your voltage almost sure to let the magic smoke out of your controller. Then when you replace the controller, fairly likely the smoke comes from the motor, unless you have a very big motor to begin with.
Read and learn, so you don't KFF.
new2thiss said:amberwolf said:Enough voltage to hurt and make really big sparks.new2thiss said:Just wondering what two 60v 20ah lifepo4 batteries connected in series would equal?
Very carefully, and by reading about all the many threads on putting batteries in series.And how would I go about doing it?
Not curious enough to read about what others have already done, I'm guessing. :/Clearly beginning to form an addiction here lol nevertheless I'm curious!
Thank you for taking the time to be that guy. I feel much more foolish now that youve writtenthat. Except I don't. I'm actually on this site a lot, but the information is not specific to what I want to do so I'd like concrete information specific to what I'm considering doing. If you can't help great, but don't be an asshole.
wb9k said:The guy you called an asshole here for trying to potentially save your life had his house burnt down by a battery fire. All those dogs with the halos in his avatar were killed in that fire. He knows very well--NOW--what the dangers really are.
amberwolf said:Apologies for the OT, but this is necessary to clarify something important:
wb9k said:The guy you called an asshole here for trying to potentially save your life had his house burnt down by a battery fire. All those dogs with the halos in his avatar were killed in that fire. He knows very well--NOW--what the dangers really are.
I appreciate your input and defending me, but this is very wrong.
There was no battery fire. The batteries I had were not in the room that burned, and all survived the fire (though several were stolen during the house rebuilding it).
The actual cause of the fire was not specifically determined, but it's ignition point was, and it was a spot of floor that was bare of anything for at least 2 feet in every direction. The suspected cause was spontaneous combustion of the asbestos mastic the tiles were glued down with several decades earlier; they said that has happened before.
wb9k said:amberwolf said:Apologies for the OT, but this is necessary to clarify something important:
wb9k said:The guy you called an asshole here for trying to potentially save your life had his house burnt down by a battery fire. All those dogs with the halos in his avatar were killed in that fire. He knows very well--NOW--what the dangers really are.
I appreciate your input and defending me, but this is very wrong.
There was no battery fire. The batteries I had were not in the room that burned, and all survived the fire (though several were stolen during the house rebuilding it).
The actual cause of the fire was not specifically determined, but it's ignition point was, and it was a spot of floor that was bare of anything for at least 2 feet in every direction. The suspected cause was spontaneous combustion of the asbestos mastic the tiles were glued down with several decades earlier; they said that has happened before.
I stand corrected...sorry for my confusion. I though I had read a long time ago it was a battery fire.
That said, I stand by the rest of my statements.
Chalo said:To address your original question, two identical 60v batteries in series make a 120v battery of the same Ah capacity as the single units.
To address other people's concerns, 60v is already higher than "generally recognized as safe" voltage, and 120v can easily kill you if you close the circuit with your body.
I have a battery of over 100 nominal volts, and it's difficult to find a controller rated for that much voltage. 60v is already pretty high for an e-bike; perhaps you should consider putting your batteries in parallel if you want more range from your system.
markz said:1) more speed = more juice gone-so = more ah needed.
2) not a lot of selection on a controller of that voltage.....if any.
The best deal for you, is to pick a voltage in the range of 60V to 84V, you will find plenty of controllers that fit that range. Next, pick a motor....Direct Drive or Geared or Mid Drive. What type of battery chemistry will you use? RC Lipo, LifePO4, Nimh etc. Then you need a charger, you gunna cheap out and wait hours for it to charge? You are easily looking at a G-note.....easy.
You want speed, go Direct Drive mxus 3000w v2 MONSTER!!!!, at 84V with a Infineon Controller beefed up traces etc. Slam in some LifePO4 or is it LifePO3, whichever. Or maybe some Li-Ion from EM3ev, or ebikes.ca etc etc etc.
You go for speed, you stick out, you get fined, you may go to jail depending on if the copper had his donut break yet or not.
You go for speed, hope you have paid your health insurance up.
Best not to stick out. Best to blend in. Best not to piss anyone off.
edit: There you go $450 for a 120V controller. Most other controllers are $200. Mine was Lyen.com infineon 18fet $200.
markz said:1) more speed = more juice gone-so = more ah needed.
2) not a lot of selection on a controller of that voltage.....if any.
The best deal for you, is to pick a voltage in the range of 60V to 84V, you will find plenty of controllers that fit that range. Next, pick a motor....Direct Drive or Geared or Mid Drive. What type of battery chemistry will you use? RC Lipo, LifePO4, Nimh etc. Then you need a charger, you gunna cheap out and wait hours for it to charge? You are easily looking at a G-note.....easy.
You want speed, go Direct Drive mxus 3000w v2 MONSTER!!!!, at 84V with a Infineon Controller beefed up traces etc. Slam in some LifePO4 or is it LifePO3, whichever. Or maybe some Li-Ion from EM3ev, or ebikes.ca etc etc etc.
You go for speed, you stick out, you get fined, you may go to jail depending on if the copper had his donut break yet or not.
You go for speed, hope you have paid your health insurance up.
Best not to stick out. Best to blend in. Best not to piss anyone off.
edit: There you go $450 for a 120V controller. Most other controllers are $200. Mine was Lyen.com infineon 18fet $200.
markz said:1) more speed = more juice gone-so = more ah needed.
2) not a lot of selection on a controller of that voltage.....if any.
The best deal for you, is to pick a voltage in the range of 60V to 84V, you will find plenty of controllers that fit that range. Next, pick a motor....Direct Drive or Geared or Mid Drive. What type of battery chemistry will you use? RC Lipo, LifePO4, Nimh etc. Then you need a charger, you gunna cheap out and wait hours for it to charge? You are easily looking at a G-note.....easy.
You want speed, go Direct Drive mxus 3000w v2 MONSTER!!!!, at 84V with a Infineon Controller beefed up traces etc. Slam in some LifePO4 or is it LifePO3, whichever. Or maybe some Li-Ion from EM3ev, or ebikes.ca etc etc etc.
You go for speed, you stick out, you get fined, you may go to jail depending on if the copper had his donut break yet or not.
You go for speed, hope you have paid your health insurance up.
Best not to stick out. Best to blend in. Best not to piss anyone off.
edit: There you go $450 for a 120V controller. Most other controllers are $200. Mine was Lyen.com infineon 18fet $200.
new2thiss said:Am I right in assuming I'd simply need a new controller that supports 120v, and a new hub at 3kw because I'd be pumping out 2400 watts ?
Gregory said:new2thiss said:Am I right in assuming I'd simply need a new controller that supports 120v, and a new hub at 3kw because I'd be pumping out 2400 watts ?
Not really because you would have 2400Wh. You could easily peak over 5kW from the battery.
You should also care about Ah, at least as far as how it will work with the battery C rate to get you the current you require.
As a beginner I'd be looking for a fast wind (low turn count) motor and running voltages below the 100V mark.
Check out the "I'm a noob and I wanna go 50mph" thread.
Gregory said:new2thiss said:Am I right in assuming I'd simply need a new controller that supports 120v, and a new hub at 3kw because I'd be pumping out 2400 watts ?
Not really because you would have 2400Wh. You could easily peak over 5kW from the battery.
You should also care about Ah, at least as far as how it will work with the battery C rate to get you the current you require.
As a beginner I'd be looking for a fast wind (low turn count) motor and running voltages below the 100V mark.
Check out the "I'm a noob and I wanna go 50mph" thread.