Advcleaning
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- USA
Can this be done? Ride is mainly on flat ground and I really don't go very fast. Just cruising around the neighborhood
500w battery on 1000w motor?
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Advcleaning
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- USA
They are both 48v
scrambler
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- Bay Area, CA
I think you are confusing Watts (power) and WattHour (energy capacity).
Watt = Volt x Amp
WattHour = Volt x Amp x Hours
Battery numbers are usually Wh (capacity). A 500Wh battery capacity only gives you that, its energy capacity, but it does not tell you the max power the battery can deliver.
For that, you need to know the sustained and Max Amps the battery can deliver, as well as its voltage.
For a 48V battery to deliver 1000W of power, it needs to be able to provide 20.83Amps (1000/48)
If the battery is able to deliver 20.83 Amps sustained, and if its capacity is 500Wh, it means it can deliver 500Watts of power for one hour, or 1000W of power for 1/2 hour.
When cruising around on flat ground at constant speed, you will likely be using a lot less than 1000Watt, and therefore will be able to sustain that for longer time.
For example you could sustain 250Watt for 2 hours.
Watt = Volt x Amp
WattHour = Volt x Amp x Hours
Battery numbers are usually Wh (capacity). A 500Wh battery capacity only gives you that, its energy capacity, but it does not tell you the max power the battery can deliver.
For that, you need to know the sustained and Max Amps the battery can deliver, as well as its voltage.
For a 48V battery to deliver 1000W of power, it needs to be able to provide 20.83Amps (1000/48)
If the battery is able to deliver 20.83 Amps sustained, and if its capacity is 500Wh, it means it can deliver 500Watts of power for one hour, or 1000W of power for 1/2 hour.
When cruising around on flat ground at constant speed, you will likely be using a lot less than 1000Watt, and therefore will be able to sustain that for longer time.
For example you could sustain 250Watt for 2 hours.
That's a pretty cheesy comment. Show me more than one post, not by you, where someone uses Wh instead of W for battery power. Do that and I'll show you ten times as many that don't. But most of us understand the difference. No need to rub it in with a newby.
scrambler
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A lot of people actually do not know or understand the difference between watts and Watt hours.
Nothing wrong with making sure if they do but made a typo, or don't, and could use the knowledge.
As long as it is done kindly and without criticism
Nothing wrong with making sure if they do but made a typo, or don't, and could use the knowledge.
As long as it is done kindly and without criticism
Advcleaning
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- USA
Kinda what I was thinking but there's always one smart as$ in the bunch
rich c
Well-Known Member
Like you? Comments like yours is the definition of that. You either want help, or you don't. It wasn't a snarky answer, it was just a stated fact. If we have to make assumptions about about what the OP actually means with all the posts, all help gets that much tougher.
harryS
Well-Known Member
I've noticed some vendors on ebay do rate their batteries as 1000W or 500W, so that customers don't undersize their batteries.
Take this one.
Now this guy did put in some specs. It's really a 48V 12.5AH battery, with a maximum current draw of 30A, but the continuous current is 10A, so it's really happiest pushing out 500W, but if you pull throttle, it will give you 30A for a while.
I doubt it would work well very long with a 1000W motor at full power, but for running around at 12-14 mph where you only need 200W, it would be fine. NOT sayimg it's a good battery. I still wouldn't buy it. Just saying I think it would work.
Anyway, I hope this gives the OP some ideas.
Take this one.
YOSE POWER 48V 12.5Ah Down Tube Battery for sale online | eBay
Find many great new & used options and get the best deals for YOSE POWER 48V 12.5Ah Down Tube Battery at the best online prices at eBay! Free shipping for many products!
www.ebay.com
Now this guy did put in some specs. It's really a 48V 12.5AH battery, with a maximum current draw of 30A, but the continuous current is 10A, so it's really happiest pushing out 500W, but if you pull throttle, it will give you 30A for a while.
I doubt it would work well very long with a 1000W motor at full power, but for running around at 12-14 mph where you only need 200W, it would be fine. NOT sayimg it's a good battery. I still wouldn't buy it. Just saying I think it would work.
Anyway, I hope this gives the OP some ideas.
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