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Kohler Generators

1951 Kohler 350M21 350 Watt Generator Set #154768


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  #51  
Old 10-08-2018, 01:02:23 AM
Power Power is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

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Originally Posted by Zephyr7 View Post

There is some hope though. Get a big (several hundred thousand microfarads) “computer grade” capacitor. Wire it in parallel with DC bus for the inverter. That capacitor will help with the transients and 60Hz ripple. You want something with a higher voltage rating than your charging voltage. 35v minimum for a 24v system, and higher would be safer.

Bill
That is a lot of stored energy. Probably should include some circuit protection in case something fails.
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  #52  
Old 10-08-2018, 11:05:30 AM
Zephyr7 Zephyr7 is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

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Originally Posted by Power View Post
That is a lot of stored energy. Probably should include some circuit protection in case something fails.
Usually the caps don’t have any protection of their own, they’re just circuit elements. It wouldn’t hurt to add a beefy breaker though.

Bill
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Old 10-08-2018, 12:16:39 PM
Power Power is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

Bill, they usually don't, but several hundred thousand microfarads, even at 24 volts is a lot. Suspect enough energy to vaporize traces on board, probably most components on board.

Not one I would discharge by shorting out with a screwdriver.
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  #54  
Old 10-08-2018, 05:39:44 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

The inverter manual discusses running the DC cables adjacent to decrease their reactance, thereby reducing the load on the internal caps that are on the DC bus. Indeed this gave me the idea of putting a big 40 volt cap across the DC terminals as well.

This inverter operates in paralell with the AC source, and controls the magnetude and direction of power flow between the DC and AC side by adjusting the ratio of transformation between the two.

It is also capable of handling down to a 0% power factor in either direction.

These are the reasons that it could be programmed to correct load power factor as seen by the AC line.

As for heft, it's a beast at ~120 lbs.
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Old 02-02-2019, 11:48:39 PM
Vanman Vanman is offline
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Default Re: 1951 Kohler 350M21 350 Watt Generator Set #154768

Here's an update on this little Kohler. The trip I had planned on using it on ended up not coming to fruition. Story of my life. Hopefully this will change soon. Anyone want to buy a house?

So, it had been sitting with maybe 1/3 of a tank of gasoline for four months, and, of course, these little tanks are not air tight. Of course they have to vent.

So I finally decided that this evening I would see if she'll still light off, and spend the fuel lighting one or both of the two lights that burn in my back yard every night anyway. One 175 watt Mercury Vapor and one 70 watt High Pressure Sodium. Yeah, I'm a lighting nut too.

It took three or four pulls and some choke finagling but she sounded as good as ever after that. Fuel was probably getting a little old, losing some of the more volatile compounds already.

Plugged in the Merc, no problem! Sweet, lets add on the Sodium. Awesome! She runs 'em both. Check the line amperes since those ballasts are quite reactive, but the current wan't bad, just over three amperes.

Interestingly the flickering due to the 15 power strokes per second was quite visible in the Merc, and not visible at all in the Sodium.

It was amazing how long it ran on such a small amount of fuel. At least two hours. Finally got it all used up, and have removed the fuel cap to let the tank dry out. I was able to make it out there in time to add some choke to help get some more of the last of the fuel out of the carb.
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