How to choose between 1000w and 1500w

[minime]

No.

You'd need to upgrade the gearing and the brakes, which would cost about £100 to £150

There's extra things you need, like torque arms, connectors, wire, heatshrink, something to put the battery in and a way to mount it.

You have to do some work to the bike, like filing the drop-outs and changing the bottom bracket. Fitting stuff on the handlebars, like throttle and LCD is a right pain. It normally takes ages moving things around before you can bodge everything to fit.

Does your battery include the charger? If not, that's another £50.

For an experienced guy to fit that stuff properly, would take about 5 to 10 hours.That would cost about £100 upwards.

There's the £80 shipping cost for the final bike,

My calculation says that that bike will cost you over £1200. Of course, you can forget about the brake and gearing upgrades and pay less than £100 to get the typical crap installations that I've seen often enough, and you get a bike that soon stops working and you end up in a fight with the installer.

Finally, you take the bike out in the rain or leave it parked out overnight in the rain, and you get water in the motor. What are you going to do then?

Yes, the devil is in the details which is why I want to avoid building the bike myself.

£1200-1500 is not that bad and you get a bike that is of better quality than the ones off the shelf.

All these, off the shelf, bikes claim to be waterproof. Are they not? I've ridden the Cyclamatic in the rain a few times and have left it parked out in the rain as well. In any case, I now have a bike cover that I carry with me.

 

[flecc]

Very informative. I thought that greater voltage equates to greater speed because that's what I read in an online article (amongst the top ten on google). Or perhaps I misread or misunderstood the text...

I think where this comes from is that if one increases the voltage on a given motor/controller combinatioin, the speed increases pro rata.

For example on a 24 volt bike, change the 24 volt battery for a 36 volt one, which is 50% higher voltage. Assuming the controller can accept it the speed also increases 50%. That's in theory, in practice it can be a little less due to such as wind resistance with increasing speed.
.

 

[minime]

I think where this comes from is that if one increases the voltage on a given motor/controller combinatioin, the speed increases pro rata.

For example on a 24 volt bike, change the 24 volt battery for a 36 volt one, which is 50% higher voltage. Assuming the controller can accept it the speed also increases 50%. That's in theory, in practice it can be a little less due to such as wind resistance with increasing speed.
.

In this example and according to one of your previous post, you can use the extra 50% voltage for greater top speed and/or greater range. Correct?

What about the motor? Can you use, say, a 100v battery and appropriate controller with a 250w motor? Is there a limit to the voltage you can supply the motor (provided that the controller and the cables are not bottlenecks)?

 

[soundwave]

96v and 120amp controller is about as high as you can go, tho if the motor cant take this you will fry it as will over heat fast.

 

[Woosh]

£1200-1500 is not that bad and you get a bike that is of better quality than the ones off the shelf.

I am not convinced that you will, if you don't build the bike yourself.
Take your Cyclamatic. Can you get someone to build you a better bike for the same money?

 

[Deleted member 4366]

It says it's 9kg. And there other batteries of similar specs that are slightly lighter.

A normal Ebike battery is about 3kg, so you can reckon on a 9kg one being three times the size. You'll have trouble hiding that.

 

[flecc]

In this example and according to one of your previous post, you can use the extra 50% voltage for greater top speed and/or greater range. Correct?

Not necessarily, that quote was about power (Watts), not voltage.

If the increase in voltage was accompanied by the same Ampere hour capacity, then the wattage is increased. That can be used how you wish in two ways. By gentle riding for more range or aggressive riding for more performance.

Alternatively you can specc a bike for which way you want to use the extra capacity of a large capacity battery. A low power motor for long range or a high power motor for more performance.
.

 

[minime]

A normal Ebike battery is about 3kg, so you can reckon on a 9kg one being three times the size. You'll have trouble hiding that.

Then how about a 52v/20Ah battery at around 5-6kg? https://www.aliexpress.com/item/Passion-Ebike-48V-20-3ah-Electric-Bicycle-Battery-Electric-Bike-Kit-Battery-for-Sondors-Ebike-Part/32540220076.html?spm=2114.01010208.3.19.qpTFCg&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10130_10068_433_434_10136_10137_10138_10060_10062_10056_10055_10054_302_10059_10099_10103_10102_10096_10052_10053_10050_10107_10051_10106_10084_10083_10119_10080_10082_10081_10110_10111_10112_10113_10114_10078_10079_10073_10070_10122_10123_10120_10126_10124-10120,searchweb201603_9,afswitch_1_afChannel,ppcSwitch_4,single_sort_0_default&btsid=c75efe29-558c-4c28-8b4f-ee802878472d&algo_expid=2549123a-b85a-497d-b76b-95a224ebc13e-2&algo_pvid=2549123a-b85a-497d-b76b-95a224ebc13e

 

[minime]

Not necessarily, that quote was about power (Watts), not voltage.

If the increase in voltage was accompanied by the same Ampere hour capacity, then the wattage is increased. That can be used how you wish in two ways. By gentle riding for more range or aggressive riding for more performance.

Alternatively you can specc a bike for which way you want to use the extra capacity of a large capacity battery. A low power motor for long range or a high power motor for more performance.
.

Wattage = voltage * amperes
Therefore, higher voltage equates to higher wattage. Correct?
Similarly, higher amperes also equates to higher wattage. Correct?

 

[minime]

Sorry if I am being a pain in the ass. I am trying to understand all this so I can make informed decisions regarding the new bike.

 

[soundwave]

48v then match it with a 48v controller and hub motor.
http://www.ebay.co.uk/itm/48V1000W-E-bike-conversion-kit-Electric-Bicycle-Hub-Motor-for-rear-wheel-26-/282174461261?hash=item41b2e8954d:g:1UMAAOSw4CFYqore

it will be crap at going up hills tho

 

[soundwave]

 

[minime]

48v then match it with a 48v controller and hub motor.
http://www.ebay.co.uk/itm/48V1000W-E-bike-conversion-kit-Electric-Bicycle-Hub-Motor-for-rear-wheel-26-/282174461261?hash=item41b2e8954d:g:1UMAAOSw4CFYqore

it will be crap at going up hills tho

I'd rather not try to build the bike myself. Seems too complicated and error prone, especially for someone inexperienced.

 

[Deleted member 4366]

What speed and power you get depends on the controller, motor and battery voltage, assuming that they all are compatible with each other.

The motor winding speed determines the bike's speed. Whatever it is, it'll spin proportionally faster with a higher voltage battery, but a 60v kit doesn't necessarily go faster than a 24v one. you need to know the default motor speed and voltage before you can say how fast it'll go. The kit suppliers can often tell you the no-load road speed.

The power is determined by the controller. The more amps, the more power. You need enough power to pull the bike up to the motor's maximum speed. It takes 1kw to reach 30 mph and about 2.5 kw (IIRC) to reach 40 mph, but you have to include a percentage for efficiency - say 30%, so those go up to 1.3kw and 3.3kw.

When somebody mentions a 1000w or 1500w motor, that's how much power it can handle, not how much power it will give.

 

[minime]

What speed and power you get depends on the controller, motor and battery voltage, assuming that they all are compatible with each other.

The motor winding speed determines the bike's speed. Whatever it is, it'll spin proportionally faster with a higher voltage battery, but a 60v kit doesn't necessarily go faster than a 24v one. you need to know the default motor speed and voltage before you can say how fast it'll go. The kit suppliers can often tell you the no-load road speed.

The power is determined by the controller. The more amps, the more power. You need enough power to pull the bike up to the motor's maximum speed. It takes 1kw to reach 30 mph and about 2.5 kw (IIRC) to reach 40 mph, but you have to include a percentage for efficiency - say 30%, so those go up to 1.3kw and 3.3kw.

When somebody mentions a 1000w or 1500w motor, that's how much power it can handle, not how much power it will give.

I think I'll get the pedalease 1500w with the big whale battery and be done with it.

EDIT: Isn't a 1500w motor with a 48v/17Ah battery underpowered? (48*17=816watt hours which is half of what the motor can handle). Isn't a 1000w motor a better match for the big whale battery?

 

[soundwave]

if you remove the speed limit it will pull as many amps as it can at that voltage.

thus amp hour

 

[minime]

if you remove the speed limit it will pull as many amps as it can at that voltage.

thus amp hour

I don't understand.

If you remove the speed limit, then the 1500w motor will drain the 48v/17Ah battery in about half an hour?

 

[soundwave]

if non stop going 30mph then yes the power has to come from somewhere

 

[minime]

if non stop going 30mph then yes the power has to come from somewhere

In that case, a 1000w motor going full speed, would drain the 48v/17Ah in about an hour? (and will achieve a lesser top speed than the 1500w motor?)

 

[soundwave]

lower speed more range faster speed less range voltage is the same its just how many amps you are pulling from the batt.

a tesla model s can do 300 miles say but going as fast as it can go non stop i doubt it will be 100 as a ruff guess.

the faster you go the more wind resistance you get and then you need even more power.