How analyse a coil - Snowblower Forum : Snow Blower Forums
 
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post #1 of 5 Old 10-15-2015, 06:31 PM Thread Starter
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How analyse a coil

If Coby is around I would be interested to know how can one tell if a charging coil outputs dirty voltage or acceptable current for Led lights.
My new engine can output 60 watts. If I connect it to a 12 volt battery which would then power the hand warmers, charging the battery and the Led which I think consumes 15 watts. Any comments appreciated.

Snow Removal Apparatus I own:
Ariens ST1530DLE, and good ole arm powered scrapper.
The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.

Last edited by Normex; 10-15-2015 at 06:34 PM.
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post #2 of 5 Old 10-15-2015, 07:05 PM
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BEFORE you connect a battery you need to make sure it's producing DC and that it's regulated so it doesn't damage the battery.

Most charging systems produce unregulated AC as that is what the basic components produce and changing it to DC costs $$ as you need to add a rectifier of some sort and if you're running a battery you need a regulator to keep the voltage at a proper level ( <15 volts ).

Some of the newer LEDs come with an internal rectifier so they are plug and play as is.

What exactly is your "new engine" ??

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post #3 of 5 Old 10-15-2015, 07:15 PM
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post #4 of 5 Old 10-15-2015, 07:32 PM Thread Starter
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Thks Hsblowerfan , I just tested the output of the coil and it shows DC Volts at 19.1 volts at full speed (3725 rpm)

A 12 volt battery should handle this or not. Btw the battery is a gel type and good to start small engines and such.

Snow Removal Apparatus I own:
Ariens ST1530DLE, and good ole arm powered scrapper.
The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.
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post #5 of 5 Old 10-15-2015, 07:56 PM
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I saw the title of this thread and thought "Well, it's probably best to start by asking about its childhood".

But more to the point... here's what you really need to do. Get a good, fully charged battery. Hook it to the coil, start the engine and run it at normal speed, and measure the voltage at the battery terminals.

If it's about 14.5 volts or lower you should be okay. 14.5-15.5 is okay too but you'll get reduced battery life. Above 15.5 volts will shorten the battery life so much you probably should think about installing a regulator.

Again the above numbers are only valid *with a fully charged battery*. If the voltage is rising as you measure it, either wait until it levels off, or disconnect the battery and charge it with a charger.

~1994 Ariens 924084 (ST1032) "papa bear": restored, re-engined, real nice!
1991 Ariens 924050 (ST824) "mama bear"
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