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  #11  
Old 02-22-2010
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Sounds like it's worth a try. Thanks.
Marc
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Old 02-22-2010
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Here's another method from the Gemini 105 forum:

"I solved the problem.

How do you use a Honda EU2000i Generator to run a 16,500 btu Mermaid AC on econo-mode?

Answer: Run the AC saltwater cooling pump and AC air blower from an inverter and at the same time run the Battery Charger.

The generator has power to spare in running the compressor and battery charger.

My Mermaid AC freezes me out at 58 degrees in the cabin so I will still use the 5200 btu window AC after the Mermaid AC cools and dehumidifys the cabin. This takes about 20 minutes.
I have photo's posted in the Quiet Place 766 Album.



paul cobb 766 Quiet Place"
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Old 02-22-2010
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bb32, it sounds very unlikely to happen as the power need will just increase with additional charger-batt-inverter lose, unless you take more from batts than you replace it. I run my Vector Turbo 12,000btu from my 2000eu for one year now, and I'm ready to dispose it on a garbage. The Honda is really good charging batteries and running our freezer, but when we run the AC, it scream so loud I use it just when absolutely alone on anchorage, and unity siting on dingy at least 10' away. Charging batt plus freezer, runs 14 hours on a gallon, but AC last 3,5 hours on each tank. Since it gasp and sometimes goes dead, we set temperature the lowest possible as not to cycle on/of. I'm looking for a more powerful generator for my needs and now considering Onan, Kohler or NortherLights.
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The Gemini catamaran has a propane refrigerator, so that load is not factored in. Might be too much for a Honda 2000 with both AC and 12V fridge going at once.
Running the circulator and fan off the inverter allows the Honda to absorb the compressor startup load without popping the breaker. Yes the inverter will reduce the efficiency somewhat, but it will be way more efficient than running two Hondas as some owners have done or going to a much larger and heavier
diesel genset ($10,000+?)
Others use the Yamaha 3500 but it is larger and bulkier to stow.
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Old 02-23-2010
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Using an inverter to power the fan and other AC loads will likely work. As pointed out the Generator can handle the run load without problem.

I've used this method at work but had the ability to limit charger current. I do not think it would work with my charger because it draws so much and I cannot easily limit the current.

I would try this and just leave the charger off and run the batteries down, and charge them later, or get a small charger, maybe a 10amp and use that one.

Or just remember to shut off the charger when the AC starts.
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Old 02-23-2010
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We install soft starts on all our pumps over 25 HP. They are solid state controllers that reduce voltage to the motor during start, then a very heavy set of tiny contactors close under no load, and the electronics then go off line. What I think is unique about the Dometic device is that it supplies full power to the air conditioner all the time, and probably drops the voltage for a short time when it senses the high starting inrush. A pretty clever idea.

Gary H. Lucas
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Guys, its simple math. If Gen is capable to run pump, fan and compressor, just plug it directly as mostly AC unities can switch them on in phases to not overload the system at start-up. If not, using your inverter will drain the missing power from batt and these will deplet if you don't charge at same rate, without limit. Add more by using the inverter loss. I agree you can run it for a while then charge the used amps later, but you are simply taking the missing power form your batts; an idea used by Martervolt to create the power combi.
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The even simpler math is I can't afford the price, weight and space required for a diesel generator or a Mastervolt Combi so this workaround is good enough for me.
This accomplishes exactly what the Combi does at 1/100 of the cost.
I was well aware of the the Combi when I posted this and just as aware that I (and many others) can't have one.
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Old 02-25-2010
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Quote:
Originally Posted by GaryHLucas View Post
We install soft starts on all our pumps over 25 HP. They are solid state controllers that reduce voltage to the motor during start, then a very heavy set of tiny contactors close under no load, and the electronics then go off line. What I think is unique about the Dometic device is that it supplies full power to the air conditioner all the time, and probably drops the voltage for a short time when it senses the high starting inrush. A pretty clever idea.

Gary H. Lucas
A new thread to Honda Owners claims that a $15 hard start capacitor will do the same thing as a Dometic SmartStart device.
Is this true? If so, how is it done?
Marc
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Old 02-26-2010
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RV Air Conditioner Hard Start Capacitor | ModMyRV
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