48v 1800 vs 60 2000
- Thread starter maxg34
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depends on the motors in question..
but sure if the total power to weight ratio is better,
then that's the better solution.
That not only includes the battery though, difference in motor weight also has to be taken into account, I doubt the controller weight difference will matter much tbh, so we'll leave that aside.
But what about ride time?
I mean sure you add batteries,
but you do NOT add capacity at all
assuming 45Ah batteries for example
you'll have 60V 45Ah on and 2kW (for ease of calc assuming that's electric power)
so max ride time on full power ~1:21h
with a 3kW Motor
you still have just 45Ah (this time @72V) but drain 3kW
and you reduce the ride time to ~1:04 h
And since you cannot completely drain a battery without destroying it....
that's even 20% less really 1:04h for the 60V 2KW motor and just 51mins for the 72V 3kW version
depending on the battery sizes, you might drop below your required ride time
'sid
but sure if the total power to weight ratio is better,
then that's the better solution.
That not only includes the battery though, difference in motor weight also has to be taken into account, I doubt the controller weight difference will matter much tbh, so we'll leave that aside.
But what about ride time?
I mean sure you add batteries,
but you do NOT add capacity at all
assuming 45Ah batteries for example
you'll have 60V 45Ah on and 2kW (for ease of calc assuming that's electric power)
so max ride time on full power ~1:21h
with a 3kW Motor
you still have just 45Ah (this time @72V) but drain 3kW
and you reduce the ride time to ~1:04 h
And since you cannot completely drain a battery without destroying it....
that's even 20% less really 1:04h for the 60V 2KW motor and just 51mins for the 72V 3kW version
depending on the battery sizes, you might drop below your required ride time
'sid
Ahh..so if my math is correct, if i'm using, say...6 18Ah SLA's for the 72v set up, im looking at approx 20 min. of run time?
Unless I up the Amp Hrs to 55+ on all 6 batteries, but then its a cost effectiveness issue.
Even if I went 72v lithium ion, that would address the weight concern, but if its still 20Ah, I have the same short run time.
Came across this on Amazon and got my wheels spinning
https://www.amazon.com/Brushless-Controller-Throttle-Motorcycle-Conversion/dp/B07KR2YJ1K
Unless I up the Amp Hrs to 55+ on all 6 batteries, but then its a cost effectiveness issue.
Even if I went 72v lithium ion, that would address the weight concern, but if its still 20Ah, I have the same short run time.
Came across this on Amazon and got my wheels spinning
https://www.amazon.com/Brushless-Controller-Throttle-Motorcycle-Conversion/dp/B07KR2YJ1K
well at worst.. yes
runtime depends on actual current draw of course,
so if you're coasting down a road pulling no more than 200Watts off the motor,
you can do that for hours ...
but if you floor the pedal you end up with empty batteries after just a few minutes.
and it doesn't matter much if you're using SLAs or some sort of LiIon pack
Motor controllers have a low voltage protection to prevent the batteries from getting drained past their recovery point.
So the extra juice you can squeeze out a deep cycle SLA is as pointless as the extra a LiIOn is able to provide unless your controller is programmable.
(Usually those keep cheap lead acid wet cells alive just fine)
Only difference is weight and price..
'sid
runtime depends on actual current draw of course,
so if you're coasting down a road pulling no more than 200Watts off the motor,
you can do that for hours ...
but if you floor the pedal you end up with empty batteries after just a few minutes.
and it doesn't matter much if you're using SLAs or some sort of LiIon pack
Motor controllers have a low voltage protection to prevent the batteries from getting drained past their recovery point.
So the extra juice you can squeeze out a deep cycle SLA is as pointless as the extra a LiIOn is able to provide unless your controller is programmable.
(Usually those keep cheap lead acid wet cells alive just fine)
Only difference is weight and price..
'sid
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