Is there such a thing as a wattmeter/ammeter with a sound voltage alarm?

[Planet Indigo]

I've been trying to find an all in one meter for my ebike that would give me voltage, amp draw and a user selectable voltage sound alarm for low and high voltage, but I can't seem to find such a thing...
The only meters with sound/buzzer voltage alarm that I've found just measure voltage, and the most versatile ammeter I found only have one (not two) non sound alarm (just screen flash, no sound).
Anyone knows or use such a device? Any link?

 

[indianajo]

One can turn a voltmeter into an ammeter with a precision shunt. The ones I have produce 50 mv for a 5 amp current and another 50 mv for a 10 amp current. They weigh about 1.5 pounds each, have exposed brass everywhere that would short if it touched the other half of the circuit, and the brass and connectors would probably corrode when installed on a bicycle. 50 mv was a common full scale range of analog voltmeters, which aren't commonly available anymore.
I really don't know why you want to monitor amps. The LCD display that I bought with my motor measures "watts", which is sort of the same thing if you divide the watts by 50 in your head.
However, on the amps front, I feel totally protected by the 30 amp fuse I installed between the
battery and the 26 amp controller. If the controller blows the 30 A fuse, something is really wrong. You could carry a spare fuse I suppose, in case the wiring had gone bare somewhere and + and - touched each other. But since these are bicycles, not scooters, then pedaling home is a suitable fallback plan IMHO if the controller/motor/wiring blows the fuse. With no fuse, then you don't have to carry electrical tape, shrink tubing, spare FET's, a #3 phillips driver, and a soldering iron in your road tool kit, either.

 

[rich c]

What I find curious about your search is how a voltmeter works on bike batteries. The voltage will fluctuate as you ride. So go up a hill as you near your low setting, and the alarm would go off. But cruise on a flat or negative grade after the low voltage warning, and the voltage will come back a little. That alarm could get really annoying after a while.

 

[rannyv]

I suggest you look on the endless sphere e-bike forum. That's where the e-bike DIY know-how is found.