LCD Voltage monitor - how connect to Battery?

[Allex]

Guys, I would like to connect a digital meter to my batteries. Question is how I do this.
I bought few of these and they burned up when I tried
http://www.ebay.com/itm/Red-LED-LCD-Display-Digital-Voltage-Volt-Meter-Voltmeter-Panel-DC-0V-99V-New-/270982507618?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D14135%26meid%3D5382886104856329379%26pid%3D100015%26prg%3D1085%26rk%3D1%26sd%3D270982507618%26

Feature:
Range: DC 0-99V
Refresh rate: about 500mS / times
Maximum input: <1.2 times the range
Accuracy: 1 %(+/- 1 digit)
Power Supply: DC 4.5-30V
Operating temperature: -10°c~ 65°c
Dimension: Approx. 30x16x11mm
Wiring:
Red Wire: Power Supply +
Black Wire: Power Supply -, Measure -
Green Wire: Measure +
Power cannot be reversed, otherwise it will burned the module
****************************************************************************

First of I tested them with a 9V battery
Battery PLUS to Panel red wire
Battery PLUS to panel green wire
Battery MINUS to Panel black wire

Test went fine

Than I connected with same principal but to a 84V lipo battery and the components on the LCD circuit board burned up.
What am I doing wrong here (something with powersupply max Voltage 30V)?

 

[geeeyejo1]

I'm guessing that the display can range from 0-99V but the maximum the meter can handle is 30V. I bought this unit on Ebay:
http://www.ebay.com/itm/170846310527?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
This seems like it will handle your range of voltage. I wired mine (only two wires) directly to my battery connectors and have unit taped to wires between connector and fuseblock- works flawlessly and allows me to see battery status while charging and even when pack is just sitting around...

 

[dnmun]

no need to guess, it states right there 5V-30V power.

 

[Allex]

Ok so what is the point of typing in range up to 99V if it does not handle it?

 

[geeeyejo1]

Ok so what is the point of typing in range up to 99V if it does not handle it?

It's called "English as a Second Language", lol

 

[wesnewell]

Ok so what is the point of typing in range up to 99V if it does not handle it?

It's needs a separate power source. The negative lead )black is common between the power source and the battery pack you are going to measure. Hook it up like this.
black to power source negative and battery pack negative.
red to power source positive (4.5-30VDC)
green to battery pack positive. Specs say it can be up to 99vdc for reading but ok up to 119vdc ( 99x1.2)

 

[Allex]

Ok so what is the point of typing in range up to 99V if it does not handle it?

It's needs a separate power source. The negative lead )black is common between the power source and the battery pack you are going to measure. Hook it up like this.
black to power source negative and battery pack negative.
red to power source positive (4.5-30VDC)
green to battery pack positive. Specs say it can be up to 99vdc for reading but ok up to 119vdc ( 99x1.2)

Ok but my powersource is a 84V battery , so guessing that it will burn anyway?

 

[rocwandrer]

Ok so what is the point of typing in range up to 99V if it does not handle it?

It's needs a separate power source. The negative lead )black is common between the power source and the battery pack you are going to measure. Hook it up like this.
black to power source negative and battery pack negative.
red to power source positive (4.5-30VDC)
green to battery pack positive. Specs say it can be up to 99vdc for reading but ok up to 119vdc ( 99x1.2)

Ok but my powersource is a 84V battery , so guessing that it will burn anyway?

Isn't this basically implying you need to use the 9v battery (or something between 4.5 and 30v) as the power source, and then it will read voltage on the 84v source without burning up?

 

[dogman dan]

It says right there on the ad that it needs a seperate lower voltage power supply to run it.

Good thing they were cheap. My advice, call it a lesson learned, and then go looking for one with just two wires. Those run on anything between 15v and 99v.

That's da kine you want.

 

[Allex]

Yup, problem is, I wanted the small ones to fit inside of my thumb throttle

 

[dnmun]

i think the two wire type have to be limited to 60V. there is one regulator 2596 good to 30v and the 2596hv is good to 60V.

 

[wesnewell]

Yup, problem is, I wanted the small ones to fit inside of my thumb throttle

So use +5V out of your controller. It's probably already in the thumb throttle.

 

[wesnewell]

i think the two wire type have to be limited to 60V. there is one regulator 2596 good to 30v and the 2596hv is good to 60V.

Nope. See link in second post.

 

[Allex]

Ok will get back here when I get a replacement.
So it should be a Ground(black wire) in the throttle and a +5V wire?
Where do I connect the green one then, is it to battary + ? Does I have it in the throttle also?

 

[dogman dan]

Replace it with this one bro.

http://www.ebay.com/itm/170846310527?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

 

[Allex]

Yes, that one is good. But looks huge, want to have a nice fit. Anybody know of a smaller one?

 

[geeeyejo1]

Yes, that one is good. But looks huge, want to have a nice fit. Anybody know of a smaller one?

I have the same one - not huge at all - see my pic previously posted - maybe just under 1" long and 1/2" wide/deep.. Also water proof so if you happen to ride your bike into a lake and ruin it you can salvage the voltmeter, lol :lol:

 

[Allex]

I ordred one that you have
I guess function is more important than size when you think about it.
Here is the burned ex.