Honda GX 620 alternator output

[i6pwr]

The alternator that is used to charge the battery, what is the current rating of this? I'm looking to attach a couple DC powered fans to my generator enclosure and was hoping to use the alternator to power them if possible.

I figure they don't pull more than 6-7 amps combined.

 

[punisher]

From what I can tell there are two different charging systems.

3 amp (3 wire rectifier assembly), and a 20 amp, with a 6 wire rectifier/regulater assembly.

 

[berniedd]

I'm just curious why you'd want to increase air flow. Shouldn't the original design allow enough air to prevent overheating?

 

[i6pwr]

I would think so considering the 777 CFM output. However i'm constructing an enclosure and will add additional venting, just need to add in a fan and the DC powered squirrel-cage fans have alot more CFM. I can run a fan off the AC output of the generator but I would like to get this one fan working considering it's higher static pressure.

 

[meep]

what fan are you using? the typical 12V output is pretty small... that 3A sounds right to me. Could use a simple 120VAC-12VAC transformer with a $6 bridge rectifier off the 120VAC side... less risk of overloading the crude alternator.

 

[eljefino]

Isn't the 12v a "battery charging" socket with really crude pulse-y DC? That might wreak havoc with a motor.

 

[i6pwr]

I was thinking on hooking to the battery thus hopefully keeping a steady current. The AC-DC converter is an option also.

 

[Texan4Life]

Originally Posted By: i6pwr
I was thinking on hooking to the battery thus hopefully keeping a steady current. The AC-DC converter is an option also.


you could use a computer power supply and tap into one of the 12v rails. Even the el cheapo PS have at least two 12v rails. so you could connect them together if you needed more amps. It has been a few years since i spec'd a PS, but IIRC it should put out at least 8 or 10amp per 12v rail.

 

[meep]

unless you can source/build a PS cheap, which could be hard if the fan needs 4+ amps, you'll be better of just buying a 120V fan.

What is the fan's amp draw/cfm?

Those charging circuits don't have much extra-- your typical 10HP [censored] rider may have 2 7.5W lamps, tops, right? 15 W @ 12V just over 1 amp.... There's not much wiggle room.

M

 

[Texan4Life]

Or maybe upgrade to the high output alternator? can you buy the parts from honda and swap it in? I did that on a briggs, moved the charging system from the old engine to the new one. The mower had an electric clutch for the deck so it originally spec'd the larger alternator.