Electric Bikes - Affordable voltmeter amp meter
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well i did a little reseach and i found some people are using this rc digital meter on there ebikes with good results. there cheaper than the braindrain and theres no backlight but im sure it could be added.
astro flight inc
anyone test this meter? or one like it?
01-16-08, 06:58 AM
ummm no idea karma what do that thingo get used for?
it will give me a idea how manny amps my motor draws, and voltage left on the battery pack.
i just phoned the hobby shop there $50 im about to pick it up. ill post a pic
01-16-08, 01:02 PM
The astroflight is good but ideally you need to keep the wires short. Eagletree makes a great unit with a separate panalview that you can install where you want. http://www.eagletreesystems.com/MicroPower/micro.htm
I use an Astroflight for monitoring how much charge I put back into my battery pack.
dang to late looks like a nice unit. i ended up geting a mpi mx8120. ill just use heavy gauge wire.
i would return it but i got a deal.
even my meter is custom lol :0
now i can keep the wires short and still have the display on the bars. i also found out i could replace the lcd with a custom one if i find it hard to see in the sunlight.
01-17-08, 04:22 PM
Very cool! Nice work
01-17-08, 11:56 PM
Well, the reason that the drainbrain is the price it is, is that aside from providing details on energy output and usage, its also a cyclometer, able to regulate motor usage and actually directly interact with your controller, and has a more robust data spread to offer.
But for $50, thats actually pretty cool too :D
I like the handlebar layout, looks very clean.
and works very well, i had a chance to try a test run today first try i had a problem every time i gave it gas the meter would reboot kinda irritating. so returned home placed the pcb even closer to the batteries. and presto now it works. the setup works great.
this is the setup.
controller 21amp 48volt
with full charge the meter reads full out
21.5 amp anything over would cook the motor
1266.23 watts lol :) after a few minutes it would drop to 900watt still using the cheap led acid
not bad for my first hubmotor build on a buget :0 my speed was last time i had a chance to look at it was about 35khm
i also find the motor as it speeds up has a weird ringing sound only thing on the net i could find that Matches it would be this ->http://www.youtube.com/watch?v=HwSKoOtImYs&feature=user
when he starts off from the lights anyone have a clue what it is? im still new to hubmotors
02-27-08, 02:18 AM
Ya. That's really nice. Thanks
it was allright for led acid but my new lifepo4 has a higher voltage, and im geting a overvolt. down the road it going to fry it so i have started work on somthing a little more high end.:p
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