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Unread 03-28-2011, 09:51 PM   #1
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Default Dalten ScottyB Battery Meter Question

I just ordered one of the battery voltage meters from ScottyB at cartsunlimited.net and have a couple of questions.

I have read where some members wire the battery meter to the ignition switch and some wire it directly where it stays on all the time. I understand that the LED draw minimal amperage from the batteries.

I can see the benefits of both of the wiring options. It would be nice to see the status of the batteries at all time without having to switch on the ignition switch.

My question is what would affect how long this meter will last. Would it be better to leave it on all the time or would it be better to wire it to the ignition switch which would reduce the time that the meter is turned on and working. On the other hand would the constant on and off with the ignition switch shorten the life of the meter?

Basically, which would make the meter last the longest leaving it switched on all the time or having it on only when the ignition switch is turned on?

Thanks,
Thomas
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Unread 03-28-2011, 10:06 PM   #2
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Default Re: Dalten ScottyB Battery Meter Question

It draws such little power you can leave it on all the time. The meter won't go bad.
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Unread 03-28-2011, 10:09 PM   #3
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Default Re: Dalten ScottyB Battery Meter Question

Actually I take that back lol. I would just leave it on but thats me. we will see what Scottyb says
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Unread 03-28-2011, 10:37 PM   #4
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Default Re: Dalten ScottyB Battery Meter Question

Honestly I do not know what would be best as far as the life of the meter... I can call the manufacture if the electronic brain trust doesn't come up with a suitable answer

It was me that suggested he post this on the board.... The question being is an LED light going to last longer being left on or cycled on and off say 10 times a day? We have our test meter on solid for 10 months so far ... and it has sat out in 15 inches of rain this winter.... in the dash of a cart with no windshield.... Basically ~ We have been pouring buckets of water on it so far = so good, it is still sampling the pack 3 times a second.
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Unread 03-28-2011, 10:46 PM   #5
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Default Re: Dalten ScottyB Battery Meter Question

Frow Wikipedia:

Lifetime and failure:

Solid state devices such as LEDs are subject to very limited wear and tear if operated at low currents and at low temperatures. Many of the LEDs made in the 1970s and 1980s are still in service today. Typical lifetimes quoted are 25,000 to 100,000 hours but heat and current settings can extend or shorten this time significantly. [40]

The most common symptom of LED (and diode laser) failure is the gradual lowering of light output and loss of efficiency. Sudden failures, although rare, can occur as well. Early red LEDs were notable for their short lifetime. With the development of high-power LEDs the devices are subjected to higher junction temperatures and higher current densities than traditional devices. This causes stress on the material and may cause early light-output degradation. To quantitatively classify lifetime in a standardized manner it has been suggested to use the terms L75 and L50 which is the time it will take a given LED to reach 75% and 50% light output respectively.[41]

Like other lighting devices, LED performance is temperature dependent. Most manufacturers’ published ratings of LEDs are for an operating temperature of 25 °C. LEDs used outdoors, such as traffic signals or in-pavement signal lights, and that are utilized in climates where the temperature within the luminaire gets very hot, could result in low signal intensities or even failure.[42]

LED light output actually rises at colder temperatures (leveling off depending on type at around −30C[citation needed]). Consequently, LED technology may be a good replacement in uses such as supermarket freezer lighting[43][44][45] and will last longer than other technologies. Because LEDs emit less heat than incandescent bulbs, they are an energy-efficient technology for uses such as freezers. However, because they emit little heat, ice and snow may build up on the LED luminaire in colder climates.[42] This lack of waste heat generation has been observed to cause sometimes significant problems with street traffic signals and airport runway lighting in snow-prone areas, although some research has been done to try to develop heat sink technologies to transfer heat to other areas of the luminaire.[46]
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Unread 03-28-2011, 10:51 PM   #6
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Default Re: Dalten ScottyB Battery Meter Question

Thank you Gman... The brain trust is working tonight......
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Unread 03-29-2011, 01:46 AM   #7
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Default Re: Dalten ScottyB Battery Meter Question

Can someone decifer gorno's post? Lot's of info but over my head.
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Unread 03-29-2011, 07:17 AM   #8
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Default Re: Dalten ScottyB Battery Meter Question

Quote:
Originally Posted by buckmanmike View Post
Can someone decifer gorno's post? Lot's of info but over my head.
I'm with you
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Unread 03-29-2011, 09:45 AM   #9
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Default Re: Dalten ScottyB Battery Meter Question

They last a good long time, extreme heat can shorten their life, extreme cold can make them brighter. If you want to leave it on all the time, that would be fine. Switching it on and off does not shorten it's life like a flourescent bulb.
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Unread 03-29-2011, 11:02 AM   #10
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Default Re: Dalten ScottyB Battery Meter Question

Worst case
at the low end 25,000 hours, leaving it on all the time = 3 years.
Turning it on/off at key = 30 years
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