How can I increase the output of my DC generator?

In regard to portable AC generators with conventoinal battery chargers plugged into them . . . I don't know why your experience is different that mine - and many others.

In regard to the Subaru powered generator. It's rated at watts surge and watts sustained. That ought to be capable of 160 amps at 14.5 volts.

Have you every actually checked your amp output while using?
I suspect you haven't. I've checked many. I've got three el-cheapo battery chargers from Walmart. Also a couple of large shop-type chargers. I also have two remote properties with large inverters with built-in 70 amp battery chargers (one is Outback and the other is Trace/Xantrex). None of these chargers work well when plugged into a portable AC generator. One example - my Walmart 2 /6 amp charger puts out a max of 2 amps when used in the 6 amp charge mode. I've tested it sitting next to a grid-powered outlet. Consistently gets the 6 amps charge when plugged to the grid. Then plug it into an AC generator and it drops to 2 amps. When used in the 2 amp mode it puts out almost nothing.
The built-in 70 amp battery charger in my Xantrex unit puts out a max of 25 amps when hooked to a portable AC generator.
Same sort of thing happens when using many AC generators to run cordless-battery chargers. My Makita 18V and Ryobi 18V take around twice the normal time to charge with an AC generator. I recently got a 12 volt DC charger that runs off my truck instead and it works much better and faster.

I don't know what sort of AC generator you have - but it often goes like this. Most cheaper portable AC generators put out low voltage. It goes un-noticed for most uses - but shows up when used with conventional battery chargers. Normal grid AC power has cycle-peaks at 160 - 170 volts. Cheap chargers clip their power from that 160-170 volt range. Many portable generators only peak at 140 VAC - thus the problem.

Again, I have no idea what generator you have. I have two Homelite watt units. Also a Homelite watt, two Coleman Pulse watt units, a Coleman watt, two cheap Chinese watt, a cheap Chinese watt, etc. I also have several large "backup" units. One came out of a local highschool - it's a Fairbanks-Morse 17 KW powered by a water-cooled four-cylinder Continental engine. I also have a 12KW diesel-Delco unit. Of all the generators I just listed - none of the small portables will run a battery charger at even half its rating. The two large "backup" units will.

Inverter portables also will run chargers very well. That because they are DC generators hooked to full-wave inverters. But, they are pricey.

People who work in the solar-electric industry have recognized this battery-charger problem for years. That's why they sell voltage-enhancers to force chargers to work better with portable generators. Many places publish lists of tested generator-sets and which ones put out good voltage and which ones don't.

Also, high end electronic battery chargers tend to work much better with portable AC generators. I have several Iota chargers - a 24V and a 48V that work very well. Trace/Xantrex added an electronic charger to their SW inverter/charger series that works well with small portable AC rigs. Not with their DR series, however (like I have).

Again - you say your cheap charger works to rated capacity with your cheap AC generator? All I can say is . . . if true - you are an exception to the normal rule.

In regard to possible amp-output of the Subuaru genset I have. It is presently rated at 67 amps @ 36 volts DC, i.e. watts. At 14.5 volts that would be 165 amps of current - going by those ratings. So, if it's technically rated at 165 amps - why do you say it's not capable of making 100 amps?

The regulator that's on it now is a Basler - Input - 180-270 VAC 50-60 HZ. Output - 63 VDC and 2 amps DC. Basler
S/N H

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