[speedyj]

I’ve been rebuilding a Yamaha EF1000is for most of the day. It now runs and the AC coil is spot on @ 122v/60hz at any rpm. When I put the multimeter on the secondary coil (DC) output, at idle it’s about 14.2v which I’d expect, but @ WOT, it’s nearly 19.2-.3. I realize once connected to a battery, the voltage differential will drop that by some but it does seem a bit high. Any comments?

 

[iowagold]

that is the way they role.

best to use a buck boost unit on them if you want a cigar lighter output for like cell charger.
pm if you need links for that mod.

 

[speedyj]

that is the way they role.

best to use a buck boost unit on them if you want a cigar lighter output for like cell charger.
pm if you need links for that mod.

I’ll take a link. I’m going to charge a larger marine battery in the AM that I know is down around 11.9v and see where it goes. My 4 decade old Honda E300 always had about 13.7-14.6v @ WOT but it has no AVR or inverter, just a bridge rectifier so you can play with the throttle to fine tune it.

thanks for your reply.

 

[iowagold]

link send via pm

yea all of the little gens do not have steady regulation on the dc portion of the gens.
the mod for a buck boost is a good mod for sure.
i do this on all of the honda gens in the fleet.
and it opens you up for adding usb charging ports if you need one or a cig lighter port so you can plug in any device on 12 volts at rated current.
a big note some dc windings are 5 amp to 20 amp so check the wiring diagram for your gen set.
most of the hondas are 5-10 amps so i use a 20 amp rated buck boost device to make it last for a long time.

 

[sledman8002002]

13.7-14.6v @ WOT

As I recall, similiar results from my two 2200 inverter gens, 13.7 -14.2v (ECO on and off) on the occasion that I actually did a quick measurement.

 

[GenKnot]

When I put the multimeter on the secondary coil (DC) output, at idle it’s about 14.2v which I’d expect, but @ WOT, it’s nearly 19.2-.3.

This unit does not have an internal DC voltage regulator...just a rectifier (#4). So, the faster the gen runs, the higher the DC voltage.

 

[speedyj]

link send via pm

yea all of the little gens do not have steady regulation on the dc portion of the gens.
the mod for a buck boost is a good mod for sure.
i do this on all of the honda gens in the fleet.
and it opens you up for adding usb charging ports if you need one or a cig lighter port so you can plug in any device on 12 volts at rated current.
a big note some dc windings are 5 amp to 20 amp so check the wiring diagram for your gen set.
most of the hondas are 5-10 amps so i use a 20 amp rated buck boost device to make it last for a long time.

Thanks for this.

 

[speedyj]

This unit does not have an internal DC voltage regulator...just a rectifier (#4). So, the faster the gen runs, the higher the DC voltage.

View attachment 13934

I figured as much. I’m used to seeing regulator/rectifiers on snowmobiles, seadoos, Honda 3 wheelers and ATV’s as a single unit most of the time. There is a tiny 4 pin rectifier buried under the fuel tank on these units that I came across upon disassembly.

and after charging a boat battery this morning for about 30 mins, it’s definitely working. Float voltage between the posts on eco-throttle was 14.9-15.4. Thx for the insight folks.