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Compressor Airhorn
#1
Hi forum - I am considering powering a 12V Airhorn with 18650's

this is the item : https://www.banggood.com/5pcs-178DB-12V-...rehouse=CN

aside 12V it doesn't give much info.

Is that possible ?

If considering a cell is 4.2V - 3 Cells in series would yield 12.6V

however, how many in parallel ? Not sure what to make of that.

Thanks!
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#2
Hi as you said, you need more info, power consumption in Amps, depending of your cells max discharge rating will give you the number of minimum parallel cells. More cells = more working time too.
Aside of this it's been treated many times the fact of 3S of li-ion for 12V system, even with fully charged cells the whole voltage will be low, cars devices rated for 12V usually work at 13.8V, so 3S is low 4S is high, better 4S Lifepo to get a 12V system.

Regards
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#3
(05-29-2019, 06:14 PM)jesusangel Wrote: Hi as you said, you need more info, power consumption in Amps, depending of your cells max discharge  rating will give you the number of minimum parallel cells. More cells = more working time too.
Aside of this it's been treated many times the fact of 3S of li-ion for 12V system, even with fully charged cells the whole voltage will be low, cars devices rated for 12V usually work at 13.8V, so 3S is low 4S is high,  better 4S Lifepo to get a 12V system.

Regards

Thanks for this! Can try it safely without damaging the horn ? Or risky ?
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#4
I don't think you will damage the horn unless you apply higher voltage, more probability to damage the cells, I think the compressor will consume a lot of current, so you need a lot of parallel cells so voltage won't drop a lot.
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#5
(05-29-2019, 08:43 PM)jesusangel Wrote: I don't think you will damage the horn unless you apply higher voltage, more probability to damage the cells, I think the compressor will consume a lot of current, so you need a lot of parallel cells so voltage won't drop a lot.

Thanks for this, I will give it a go. Try to save myself from buying new batteries.
If not, will consider buying a different battery
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#6
I had a 12V air horn a while back (long distant youth!) & it drew about 20 - 25A so you'll need a pack, wiring & fusing capable of that.
Less voltage & current won't hurt it (unless you hold the motor stalled) - it'll just sound wheezy or like a goat bleat!
Running off solar, DIY & electronics fan :-)
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#7
(05-30-2019, 09:44 AM)Redpacket Wrote: it'll just sound wheezy or like a goat bleat!

Hey, maybe he's goin for that sound! Tongue
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#8
Hahahha yes you got me Big Grin
Korishan likes this post
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