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Old 02-06-2004, 02:21 PM   #1
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Power boost inverter?

So here is a hair brained scheme. Yamaha makes a nice (but too heavy for me) generator that uses itís own starting batteries to provide an extra boost when high current demands are present (ie air-conditioner starting). I was wondering if this would be possible with house batteries. I poked around for a synchronous inverter (just guessing that that was what I would need) but I just ended up confused. So for you electrical gurus out there, could an inverter be set up to kick in with a voltage drop to handle the peak draw from an air-conditioned, while otherwise running off a regenerator. The inverter would need to kick in synchronized with the generator to work.

I would like to use a Honda 2000i to run the ac, but I know it wonít handle the starting load. But if the house batteries could be used just for the surge, it might work out.

Thoughts, sources, criticism, ridicule...

FYI the latest high efficiency ac from Dometic run at 10a with fan, but have a starting current of 37a.

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Old 02-06-2004, 07:35 PM   #2
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i dont think you will find what your asking for. most inverters are only switched on when you dont have ac input. 37 amps ac would take a bunch of battery dc current to invert. but that is only for a very short time.

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Old 02-06-2004, 07:44 PM   #3
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Our ProSine 3.0 does that. I have watched the control panel on many occasions kick into the inverter mode while providing a boost during a inrush. Then it goes back to ac.
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Old 02-06-2004, 08:50 PM   #4
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The ProSine does NOT augment incoming AC current, in the same way the Yamaha uses its batteries to augment the generator output.

If the incoming AC voltage drops too low, the transfer switch in the ProSine switches, totally replaces the incoming AC, and CARRIES THE WHOLE LOAD with clean power totally generated from battery power. That can mean 370+ amps from the batteries if the AC requires 37 amps to start.

It can also TOTALLY REPLACE the incoming AC if it gets out of frequency tolerances, which won't be the case with a Honda generator.

The Pro-Sine does NOT "condition" incoming AC power, but can TOTALLY REPLACE it with clean AC generated from the batteries, if it is "dirty" with quick rise time voltages.

How they operate is explained in my post here.

Intermittent high current draws from the batteries, such as those from AC startup, are usually replaced by charging, but continuously dirty or low voltage power can cause the ProSine to drain the batteries fairly quickly.

Just to be clear about it.
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