Ah

Hi, We walked round Rutland water today and into their bike shop. Now being a bit of a numpty with Lecky bikes I noticed all theirs were advertised showing Wh and not Ah most were either 400 or 500 Wh. when I asked the assistants how this converts to Ah they couldn't answer the question.

Is there a conversion or does this mean something completely different?

Hi, We walked round Rutland water today and into their bike shop. Now being a bit of a numpty with Lecky bikes I noticed all theirs were advertised showing Wh and not Ah most were either 400 or 500 Wh. when I asked the assistants how this converts to Ah they couldn't answer the question.

 

Is there a conversion or does this mean something completely different?

I think it means you might want to consider visiting a different ebike shop ;-)

Hi, We walked round Rutland water today and into their bike shop. Now being a bit of a numpty with Lecky bikes I noticed all theirs were advertised showing Wh and not Ah most were either 400 or 500 Wh. when I asked the assistants how this converts to Ah they couldn't answer the question.

 

Is there a conversion or does this mean something completely different?

DIvide by the voltage to get Ah.

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Hi, We walked round Rutland water today and into their bike shop. Now being a bit of a numpty with Lecky bikes I noticed all theirs were advertised showing Wh and not Ah most were either 400 or 500 Wh. when I asked the assistants how this converts to Ah they couldn't answer the question.

 

Is there a conversion or does this mean something completely different?

Just divide by the voltage of the battery, that's leaves the Ampere hours.

Watt/hours is more useful since it gives the total current available. For example you might see two e-bikes both with 10 Ah batteries, but the one with a 26 volt battery only has 260 W/h, while the one with the 36 volt battery has 360 W/h, 38% more current potential.

N.B. Crossed with Brighton e-bikes post.

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DIvide by the voltage to get Ah.

 

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So my 36V 522Wh battery equates to 14.5Ah.

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Which has the most range potential.....36v 13ah or 48v 12ah?

36x13=468, 48x12=576 - the larger the resulting figure the greater potential range

Just divide by the voltage of the battery, that's leaves the Ampere hours.

 

Watt/hours is more useful since it gives the total current available. For example you might see two e-bikes both with 10 Ah batteries, but the one with a 26 volt battery only has 260 W/h, while the one with the 36 volt battery has 360 W/h, 38% more current potential.

 

N.B. Crossed with Brighton e-bikes post.

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...but flecc provided a far superior explanation, go with that!

36x13=468, 48x12=576 - the larger the resulting figure the greater potential range

Spot on. I was going to reply simply 'You do the Math'! *with American accent.

P=VI or power=volts×amps

Why does it have to be so complicated? It would be so much easier to give it a number! How big is your battery? It's a size 11.

Why does it have to be so complicated? It would be so much easier to give it a number! How big is your battery? It's a size 11.

Wow, yours goes up to 11 !

Crank it up then!

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Why does it have to be so complicated? It would be so much easier to give it a number! How big is your battery? It's a size 11.

Not so sure, could end up like shoes, size 11 wide fit or size 11 narrow fit etc.

I think only an improvement in schools teaching is necessary. The public understand gallons and litres, Watt/hours are the electricity equivalent and no more difficult, just a quantity.

I daresay there will be more understanding as more e-vehicles are brought into use. For example Nissan don't speak of voltage or A/h on the Leaf e-car, they just say the kW/h capacity of the battery. Their standard battery is 24 kW/h,. the longer range one 30 kW/h.

Simple.

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Not so sure, could end up like shoes, size 11 wide fit or size 11 narrow fit etc.

 

I think only an improvement in schools teaching is necessary. The public understand gallons and litres, Watt/hours are the electricity equivalent and no more difficult, just a quantity.

 

I daresay there will be more understanding as more e-vehicles are brought into use. For example Nissan don't speak of voltage or A/h on the Leaf e-car, they just say the kW/h capacity of the battery. Their standard battery is 24 kW/h,. the longer range one 30 kW/h.

 

Simple.

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It must be my age... I know what a pound of Apples looks like, I can even visualize a kilo of Apples.... but a litre of Apple's has me beaten.[emoji27]

But 24,000 watt hours sounds so more impressive,

at least better than my 360 watt-hours.

But 24,000 watt hours sounds so more impressive,

at least better than my 360 watt-hours.

Until you strap it on your carrier.

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It must be my age... I know what a pound of Apples looks like, I can even visualize a kilo of Apples.... but a litre of Apple's has me beaten.[emoji27]

I would hope so, a litre is a liquid measure.

By the same virtue a gallon of apples is no easier to judge.

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I would hope so, a litre is a liquid measure.

 

By the same virtue a gallon of apples is no easier to judge.

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I thought I was being clever by saying litres ... when actually using old money is much easier.. I can visualise a gallon bucket full of Apple's. But not a watt hour of sparks. I used to use the old one bar one kw electric fire to decide how much juce things used but it's gone way past that now.

I thought I was being clever by saying litres ... when actually using old money is much easier.. I can visualise a gallon bucket full of Apple's. But not a watt hour of sparks. I used to use the old one bar one kw electric fire to decide how much juce things used but it's gone way past that now.

Best to just think in quantity terms, just as we do with cars, such as 30 mpg.

Average e-bike consumption is 12 W/h per mile, shown by our many surveys over the years. So if you've got a 480 W/h battery and you're an average rider in moderate territory, you can get about 40 miles range.

Strong riders and a few older weak e-bike systems can get consumption down to about 8W/h, below that it's not worth e-biking since it's mostly pedalling.

And very powerful systems can eat more, up to 20 W/h per mile or more, while you sit back enjoying the view.

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It must be my age... I know what a pound of Apples looks like, I can even visualize a kilo of Apples.... but a litre of Apple's has me beaten.[emoji27]

Easy it's called cider.

Why does it have to be so complicated? It would be so much easier to give it a number! How big is your battery? It's a size 11.

That would make it much easier for everyone instead of quoting mythical range figures.

Best to just think in quantity terms, just as we do with cars, such as 30 mpg.

 

Average e-bike consumption is 12 W/h per mile, shown by our many surveys over the years. So if you've got a 480 W/h battery and you're an average rider in moderate territory, you can get about 40 miles range.

 

Strong riders and a few older weak e-bike systems can get consumption down to about 8W/h, below that it's not worth e-biking since it's mostly pedalling.

 

And very powerful systems can eat more, up to 20 W/h per mile or more, while you sit back enjoying the view.

.

Ah! Just like my car then which will do 67mpg! Or so the bumf says!

P=VI or power=volts×amps

Unfortunately, it's not as simple as that, except that it could be used to calculate range if you knew how much power is coming out of the battery, but in most cases the power is changing all the time. In terms of the bike's power, it's power = efficiency x volts x amps. Efficiency changes all the time too, so it's very difficult to calculate anything meaningful.