Author Topic: Voltmeter  (Read 6588 times)

Offline Strawboss

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Re: Voltmeter
« Reply #15 on: November 18, 2012, 04:00:35 pm »
I installed what is called a "Battery Bug", thats the product name. Sounds great, plug and play, digital, constant readout, tells you the voltage and the percent left in battery and percent used last start, mount it anywhere. My system may be bad, but when I took my battery in to be replaced cause the thing said it was low, battery was fine. That was 3 years ago, bought an old fashioned lead acid and no problems since. The bug has been showing 24% battery life left just after the second time I started it up with the new battery. Yes, I inserviced the new battery exactly as stated in the manual. Thinking of going with this type of meter.
COG 5852-AMA Life 302525-NRA 9098599-SASS
2001 Concours-1982 KZ550A-1979 Triumph Bonneville-1995 Honda SA50

Offline julianop

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Re: Voltmeter
« Reply #16 on: November 18, 2012, 06:08:39 pm »
The problem with battery monitor devices like that is that they can only do as good a job as the "visibility" they have of the battery and of the electrical system into which they are connected.

For example, if there is a bad connection between the battery and the point in the system at which the device is connected, then that bad connection will look like a high internal resistance, and the battery will be pronounced bad. Also, if the device doesn't have an inline current shunt (a low value resistor that connects in series with the battery) - and from what I can glean from online descriptions - then the device cannot properly measure charge/discharge current and transient voltage drop during periods of high discharge, which are essential to determining battery life. I see no way of programming the device as a function of the specific battery characteristics - rated Ah  being the most obvious.

I'm not suggesting that you don't have it connected up properly, but there's only so much you can do by measuring voltage.
Julian.
Elk River, MN.
Seasonal Temporal Navigational Disorder - that inexplicable but wholly satisfying affliction that causes one to lose the ability to drive a motorcycle straight home after work in the summer months, despite the apparent ability to make the reverse journey that same morning.

Offline JDM

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Re: Voltmeter
« Reply #17 on: November 19, 2012, 07:04:33 am »
I am a lazy SOB, I use one of these and have for years. http://www.ebay.com/itm/170776852028?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649  PS this device will not measure the amount of gas you have, you will need a plug for this to work.. ;) 
If you have seen heaven, I am sure something scared the hell out of you.

Offline George R. Young

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