ebike with speaker amp as a watt amperage is it possible

[tony.sax]

im trying out new ideas for my selfbuild ebike i hav an idea but will it work my standard ebike is so far a 250watt motor+36volt lithium battery 'brain' out of a kids razor scooter at the min its pulling 28.4 mph very illegal i no but off road its not anyway ... if i down grade my batt to 12volt which the speaker amp runs off and wire it up would it then kick out the power of the amp itself eg 250watt motor+12volt bat running through a 3000watt speaker amp+the 'brain' = ???

 

[kellys_eye]

Eh?

The power output of the amp will be according to its actual specification. Buy/use a 25W amp and it will put out 25 watts.

Total power drawn from the battery will be the wattage of the motor, controller and amplifier.

Where you'd mount 3000W of speakers is something I'd like to SEE!

 

[hevans1944]

Excellent example of the GIGO principle: Gibberish In, Gibberish Out. Posting in all lower case letters, with the only punctuation being the ellipsis (...) and three question marks (???), causes my attention to wander immediately to the next (intelligible) thread, pausing only long enough to make this comment.

 

[tony.sax]

well im sorry hevans im not punctal enough for you thought this was a forum to ask the unanswered questions and no this is not to put 3000w of speakers on a ebike im askin if i can use the same concept as a boost of power to the motor

 

[duke37]

The motor will run slower if the voltage is reduced.
Show us a picture of the 3kW amplifier.
You can get voltage boosters to raise the 12V to something higher. The current from the battery will be raised to provide the power. Some power will be lost in the booster.

It makes life easier if you use standard english without abbreviations, there are many readers who have english as a foreign language. Look up im in a dictionary.

 

[kellys_eye]

If you want to run a 12V amplifier from a 36V battery then get a converter (buck converter) to reduce the 36V to 12V.

But funny how you can put a . in your user name but not in your sentences.....

 

[tony.sax]

im not being funny is this a english test or a help me out forum for my ideas so far all everyone seems to be doing is correcting my gramma why?

 

[kellys_eye]

Why? Because we can only help you if we can understand what it is you want.

Your original post is (effectively) meaningless as we are unable to determine what you're trying to describe!

So far I get:

1. Your bike has a battery of 36V running a 250W motor
2. You want to reduce the battery to 12V to power your amplifier

.... I think.

After that we (I) haven't a clue what you're referring to......

Try breaking your request down into lines as I've just done.

 

[BobK]

no this is not to put 3000w of speakers on a ebike im askin if i can use the same concept as a boost of power to the motor

No one could have interpreted your original post to mean this. Our ability to answer your questions depends on your ability to communicate them effectively.

Bob

 

[Audioguru]

I translated the horrible "Engrish" to be:
He thinks that an audio amplifier will amplify the power of a battery. He also does not know that the ebike motor uses 36VDC but the output of an audio amplifier is not DC, instead it is AC and 3000W into a 4 ohm speaker is a voltage of 109.5AC that will blow up the 12V battery using a current of 250A and also blow up the motor.

He wrongly thinks the same as his spelling, punctuation and spelling. He thinks If he connects a 3000W amplifier on a 12V battery and connect the 250W/36V motor to the output of the amplifier then the motor will use 3000W and produce a lot more power.

He doesn't know (not no) that the maximum allowed power of the motor is 250W and if he feeds it more DC voltage to increase its power or gears down the bike to increase its current then it will be destroyed.

 

[tony.sax]

yes this is exactly what i wanted to hear, i only had an idea to see if that concept would work, yes my english is poor and yes im a bit slow but your theory audioguru would it have more of a chance if motor was upgraded

 

[Audioguru]

If you use a more powerful motor then each battery discharge will be shorter in time if you use the additional power or the battery might catch on fire. You will probably need a larger more powerful battery. A more powerful motor will also need a more powerful motor driver circuit and thicker wires.

 

[tony.sax]

i have upgraded the motor to a 350watt and the battery is now 72 volt on the series wiring. the wires have come from a old cooker so think are good for up to 240v and the 1st attempt fryed the razor controll box but i found another. its very much trial and error im not good at much but these i seem to be hitting a high mph when not suppost to

 

[Audioguru]

Your original 250W motor used a 36V battery. Is the new 350W motor also designed for a 36V battery? Isn't the razor control box designed for a 250W/36V motor and 36V battery? Then of course the control box is fried.

When the battery voltage is doubled then the current is also doubled. Then the power is 4 times as high as the original power. The 250W control box is getting 350 x 4= 1400W which is 5.6 times higher than it was designed for.

 

[(*steve*)]

@tony.sax I would encourage you to ask the questions on an electric vehicle forum.

I was an active member of one for a while, I think it was called "endless sphere" or something similar. They had dedicated groups for small vehicles such as yours. You'll find people with expertise specific to your application.

 

[tony.sax]

i have looked all over the place for the expertise in ebikes etc but as its only on my phone cant really see much the audioguru seems to know what he is talking about and explaining easyer for me to understand

 

[Audioguru]

Almost every ebike I see on the road is creeping along with a dead battery or a rider who is very overweight.
Since you want lot of power and high speed on your ebike then you need a jet turbine engine on your back. Then your ebike can pull a trailer full of fuel instead of a trailer full of rechargeable batteries.

 

[Kabelsalat]

Almost every ebike I see on the road is creeping along with a dead battery or a rider who is very overweight.
Since you want lot of power and high speed on your ebike then you need a jet turbine engine on your back. Then your ebike can pull a trailer full of fuel instead of a trailer full of rechargeable batteries.

Just so it being said (btw, thanks for translation) - the opposite way around is way cooler: