Posted by Geo-TH,In on January 20, 2015 at 13:16:43 from (104.240.206.35):
I made two energy management devices for my two generators 3500 w RV generators. I want portable generators to use at any of 12 different locations. And there is no way I want to have them within 100 ft of a house and have exhaust get inside. I choose to go with RV generators because I want to have 30 amps coming out of one place. You can't say that about larger generators. Most I've seen are only 20 amps, 120v out. I'm sure there may be larger generators for RV's that have larger outputs. But I'm cheap and happy with a 3500w one.
So I wanted to use a small quieter, more economical RV generator. I also wanted to use my generator to be portable so I can power hedge trimmers, small water pump, 4 hp chainsaw which requires 70 amps when it first starts, power up a 3/4 hp well pump, refrigerator and small appliances like hot plate, coffee pot, toaster.
So here is a brief description of how it works for house back up power. When the well comes on, everything else is turned off. When well is off the small appliances gets power, then up to 10 minutes the refrigerator gets powered up. This way my largest load, the well, gets the generators full attention. It's no big deal for me to put 2 cords through the kitchen window and rest them on counter. No big deal to put a wire through basement window and power pump.
When when I use the 4 hp chainsaw, I have a large diode placed in series with saw for 1 second. The saw is only getting half waves, half the current and 1/4 the power. I use the diode to get the armature going, produce a reverse emf, limit starting current to 35 amps. One second later, the saw gets full voltage and uses normal current of 15 amps. This prevents the generator from shaking for about 3 seconds when I start the saw.
The bigger box is my first generation. The smaller box is the same, just more compact.
Everything except for the 1 second timer is old school parts used 50 year old furnaces and AC. Most of the parts I already had sitting on the shelf.
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