James340
100 W
The batteries all have ideal diode's.I have a 12v/3p 13s battery I did for 12v compressor ect.I would like to try it in series with a 48v battery.The controller has 100v caps.This is for a Dapu 36v/350 watt geared hub motor
I want to series batteries. I currently have it wired for parallel. Can I make a adapter to reverse the polarity when going from parallel to series?
- Thread starter James340
- Start date
chuyskywalker
10 kW
There's....a lot to unpack here.
Generally, the controller is what needs to handle the voltage. And, just because it has 100v caps doesn't entirely mean that it can handle that voltage; there may be other components that could fail at too much voltage.
Do you mean a 3s 13p? Even then, 3s would barely get you 12v @ full charge (4.2 x 3 = 12.6).
So you want to get higher voltage?
To be clear, the motor itself doesn't really care what voltage you feed it (for all intents and purposes here). It'll care how many amps you put through it (because that'll be heat; which too much of will be smokey burnt up motor).
Generally, the controller is what needs to handle the voltage. And, just because it has 100v caps doesn't entirely mean that it can handle that voltage; there may be other components that could fail at too much voltage.
This sentence...doesn't make sense. What does reversing polarity have to do with anything? And, no, I don't believe there's an "adapter" that can swap around all the series/parallel connections on a battery by, like, flipping a switch.
docw009
10 MW
With a four pole double throw switch, you could rig 3 batteries to be in series or in parallel. It has to be a break-before-make type switch. Each battery needs its own BMS, and the BMS has to handle the combined voltage of all three. Sit down with a pencil/paper and you can figure it out,
and second guess yourself while you anticipate a BIG BANG! on first test..
Whats the use case for connecting a 12v? and 48v battery in parallel other than danger?
docw009
10 MW
That's why we let him figure it out.
James340
100 W
Series not parallel. I use 2 48v in parallel
James340
100 W
I did but I don't want to redo the wiring just to check out 60v.
I wouldn't bother with it.
You have a lot of new problems doing this with a battery that has a BMS.
The end solution would be expensive, heavy, and complex.
RC Lipos with series/parallel adapters might be more ideal. You can play with increments of 8-22v. But there is an art to using them safely without burning your house down.
You have a lot of new problems doing this with a battery that has a BMS.
The end solution would be expensive, heavy, and complex.
RC Lipos with series/parallel adapters might be more ideal. You can play with increments of 8-22v. But there is an art to using them safely without burning your house down.
James340
100 W
I am curious about 60v performance but it's more hassle than I am willing to endure just for curiosity. 48v is pretty impressive with this motor
based on the smippets of incomplete random information from the OP, i am guessing that they have:
two 48v batteries already in paralell on the dapu
a 12v battery built of 3 parallel 12v batteries
want to have 60v on the dapu
if this is true, then there is no reason to change antyhing from series or paralell or at all.
you simply wire the 48v set you already have in series with the 12v set you have, and tehn you have a 60v nominal battery.
however:
the lowest capacity ah between the 12v and 48v is now the actual battery capacity.
and
the lowest current amps between the 12v and 48v is now the actual amps of the entire system.
and
if the 12v packs or the 48v packs have bms, and htose bms are not rated for the full charge voltage of the 60v system, the fets may fail and leave the bms unable to protect the cells, and you probably wont' even know this has occured, until damage occurs to cells that causes sytstem problems that are obvious, and/or a fire starts.
and
the dapu display probably only handles up to around 60v max, maybe not even that, so it may fail as soon as the battery set is connected to it, and never turn on again.
two 48v batteries already in paralell on the dapu
a 12v battery built of 3 parallel 12v batteries
want to have 60v on the dapu
if this is true, then there is no reason to change antyhing from series or paralell or at all.
you simply wire the 48v set you already have in series with the 12v set you have, and tehn you have a 60v nominal battery.
however:
the lowest capacity ah between the 12v and 48v is now the actual battery capacity.
and
the lowest current amps between the 12v and 48v is now the actual amps of the entire system.
and
if the 12v packs or the 48v packs have bms, and htose bms are not rated for the full charge voltage of the 60v system, the fets may fail and leave the bms unable to protect the cells, and you probably wont' even know this has occured, until damage occurs to cells that causes sytstem problems that are obvious, and/or a fire starts.
and
the dapu display probably only handles up to around 60v max, maybe not even that, so it may fail as soon as the battery set is connected to it, and never turn on again.
