How many amps fuse to battery? - Page 2 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #11 of 17 (permalink) Old 11-05-2020, 12:25 PM
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Having the bike running while using compressor will also help cut down on the amp draw making the pigtail wiring heat up.


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No it wont. In real world activity.

Unless you have a flat battery.


The amp draw is determined by the load. The load is the wiring and the motor of the pump. If the load requires 20amps @ 12.6V That is what it will draw. You can supply it with 130 amps at 13v or 1000amps at 15V and the load is close enough to the same 20amps for it to not be a consideration.

Technically Yes higher voltage will mean the amp draw is less but the difference between 13v and 15v is not enough to even consider. If you are worried about .5 difference in amp draw to save damage to your wiring you have not wired it correctly.
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post #12 of 17 (permalink) Old 11-05-2020, 02:17 PM
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I think of the higher voltage while running keeps the compressor motor from working so hard....

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post #13 of 17 (permalink) Old 11-05-2020, 02:38 PM
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Umm, a higher voltage will push more current through the load.


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Having the bike running while using compressor will also help cut down on the amp draw making the pigtail wiring heat up.
I am curious. How would having the bike running reduce the amount of power drawn by the compressor? If anything, having the bike running will increase the system voltage slightly increasing the power draw.
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post #14 of 17 (permalink) Old 11-05-2020, 11:09 PM
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Umm, a higher voltage will push more current through the load.



I am curious. How would having the bike running reduce the amount of power drawn by the compressor? If anything, having the bike running will increase the system voltage slightly increasing the power draw.


Well. Technically an electric motor that requires 20amps at 120v to achieve 3 horsepower will make the same 3 horse power with 10 amps at 240volt. As voltage increases the amperage required to do the same job decreases.

This is why we have 277v and up.

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post #15 of 17 (permalink) Old 11-06-2020, 12:35 AM
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Comp drawing 10A @12.5 to make 125W

Voltage at 14.5 to make same 125W draws 8.6A

In the real world ( airing up off-road tires) with the comp supplied wiring, wiring runs cooler for longer with higher voltage.

Just saying compressor will have an easier time at higher voltage.

And yes it does make a considerable difference on marginally factory made little compressors.

Having increased wire size will of course help with heat, Iím just working with what comes with these little compressors.
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post #16 of 17 (permalink) Old 11-06-2020, 10:05 AM
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Just throwing in some real world, more relative to the OP's situation, likely a 16 ga. Battery Tender wire that is less than 2' long. Knowing you'll rarely use the compressor, knowing it may peak at 10 amps starting up, I put a 15 amp fuse in. Have used the compressor a couple of times running for a few minutes to air up a back tire 10psi after plugging it.

The wires did not get hot, the power wire to the compressor is more like 18 ga and 10' long... but I ran the Slime compressor too long and wore out the rubber piston ring. The compressor takes 7-8 amps running..... engine running supplies 13.5+ volts, compressor runs faster, airs up tire faster.

So, knowing that, I still would not plug anything in that took 15 amps for any length of time.. Battery Tender will take less than 3 amps. One could just stick a 10 amp fuse in and try the compressor.
OK carry on.

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post #17 of 17 (permalink) Old 11-06-2020, 01:07 PM
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Quote:
Originally Posted by Little Joe View Post
Comp drawing 10A @12.5 to make 125W

Voltage at 14.5 to make same 125W draws 8.6A

In the real world ( airing up off-road tires) with the comp supplied wiring, wiring runs cooler for longer with higher voltage.

Just saying compressor will have an easier time at higher voltage.

And yes it does make a considerable difference on marginally factory made little compressors.

Having increased wire size will of course help with heat, Iím just working with what comes with these little compressors.
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I agree with you on the amp difference between 12.5v vs 14.5 volts.

I disagree that 1.4 amps make a "considerable difference" in wiring heat or the heat generated by the load windings.

If that difference is a consideration then the unit and its supply wiring is faulty and constructed incorrectly.

Consider this. The dangerous fumes from the engine exhaust in close proximity to the work being done is far more of a consideration than the heat generated by the added 1.4amp draw of the pump running at 14.5 volts.

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