Suggestion for Battery Testing Intruments

Batteries, Chargers, and Battery Management Systems.
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dineshmdes   1 mW

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Suggestion for Battery Testing Intruments

Post by dineshmdes » Oct 23 2018 5:08am

Hi All,

I am technology enthusiast working on a electric scooter 72V 24Ah.
Can somebody suggest the basic/minimum instruments required to test the battery and controllers.

If possible can someone suggest at least the best voltmeter for this application.

Thank you in advance.

docw009   100 kW

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Re: Suggestion for Battery Testing Intruments

Post by docw009 » Oct 23 2018 8:50am

I would want a voltmeter and a wattmeter. Neither is expensive.

In the USA, one national chain store gives these voltmeters away if you buy something else. They're good enough to see if your mains AC is live or if your battery has a charge. I have about four of them.
https://www.ebay.com/itm/DT830B-LCD-Dig ... 0005.m1851

This is what I use when I need accuracy in a voltmeter.
https://www.ebay.com/itm/Craftsman-Digi ... :rk:3:pf:0

I use this wattmeter. It's not accurate as far as watt-hours. The volts are uncalibrated, but is reproducible for amps and amp-hours (aH). Also unreliable. I've had two fail. It's only 10 dollars.
https://www.ebay.com/itm/Digital-LCD-RC ... rk:10:pf:0

In India, you can probably find similar items.

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motomech   1 GW

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Re: Suggestion for Battery Testing Intruments

Post by motomech » Oct 23 2018 10:43am

dineshmdes wrote:
Oct 23 2018 5:08am
Hi All,

I am technology enthusiast working on a electric scooter 72V 24Ah.
Can somebody suggest the basic/minimum instruments required to test the battery and controllers.

If possible can someone suggest at least the best voltmeter for this application.

Thank you in advance.
Voltage only indicates potential and while a Voltage reading might indicate a bad battery(like a dead cell), it does not tell if a battery is "good".
The only way to do that, is to do a "load test", that is, placing a load on the battery and read the dis-charge rate over time/load(ie; the battery doing "work").
Often, load testing is combined w/ Hydrometer readings on electrolite filled batteries to really nail down the state (condition) of the battery.
You might want to review how batteries work to understand that checking batteries requires more than just checking Voltage.
Motomech

'03 Rocky Mountain Edge 2WD 260 Q100H frt and Ezee V1 rear 2 Elifebike 20A & 25A 9-FET controllers 12S/10Ah Multistar Lipo rear 4Ah Turnigy frt Luna Cyclops Extra lite Alex 24DM rims, Crazy Bobs run ghetto tubeless. 25 mph. Mean Well HLG-320H-54A
https://endless-sphere.com/forums/viewt ... =3&t=83430
'07 GT Idive 4 4.0, Q100C 201 14S LiPoly elifebike 9-FET 20A controller. 23 MPH.
https://endless-sphere.com/forums/viewt ... 4#p1378484

billvon   1 GW

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Re: Suggestion for Battery Testing Intruments

Post by billvon » Oct 23 2018 5:55pm

dineshmdes wrote:
Oct 23 2018 5:08am
Can somebody suggest the basic/minimum instruments required to test the battery and controllers.
If possible can someone suggest at least the best voltmeter for this application.
A Fluke 179 is the minimum I would get if you are serious about this stuff. There are also plenty of good used Flukes out there.

Also:
A volt/amp meter, like the Powerwerx Wattmeter (a lot of places make this same basic device)
A DC load (ideally with an amp-hour test function)
A charger of some sort (the Grin Satiator is a great general purpose charger)
A _good_ crimper (not a universal crimper.) Crimps will determine how reliable your wiring is.
--bill von

999zip999   100 GW

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Re: Suggestion for Battery Testing Intruments

Post by 999zip999 » Oct 23 2018 6:26pm

That wattmeters only good up to 60 volts they do sell them to 100 volts. What type of battery is this and what for ?

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