wow glad you have shown interest. Well it does appear to be overkill but I have configured this setup for the following reasons. (Having performed stress tests on a multitude of generators of various name brands providing 3500-17500 kw output.)
-
Single cylinder splash lubrication engines, regardless of brand, have proven to be good for about 4 months of continuous 24/7 use. Strict maintenance practices provide at best an additional 20-30 days of life. Operating speed 3600 rpm.
-
Generator head is a 3phase/1phase industrial continuous duty 10Kva providing single phase service. Driven pulley: 3 belt (5/8") 12 inch diam. 2 inch shaft mount. 4 pole 1800 rpm 220Vac @ 60Hz.
-
Generac 993cc engine. Drive pully 2 belt (5/8") 8" diam. Total weight including motor shaft adapter ~8-10 lbs. Operating speed is ~2000 rpm. The engine provides sufficient power at this rpm.
Lower rpm should double or greater the expected life of engine. I have experimented and tested this setup with single cylinder 8 -15 hp engines. Approxiamtely the same belt ratio was maintianed with all engines tested.. Although the power output fell a bit short of needed power, a reliable throttle control would have provided better performance from the higher hp engines. (Thus the reason I started this project.) However operating at about 2/3 +/- normal rpm the realized engine life increased 2.5 - 3 fold in most cases. A predator 420cc motor providing a full 12 months of 24 /7 service. The engines were all naturally aspirated natural gas fueled with no special adapters other than a supply hose hole drilled in the factory air boxes. (A parker gas solenoid valve 120vac directly wired to the generator ouput is the safety check. no output = no fuel. Engine primed to start process)
Currently (using the 993 engine and same gen head) the throttle is fixed and the load is kept as constant as can possible. Avg load is 10 amps. Demand load can jump to 18 -25 amps depending on appliance use which is kept to a minimum. The system is tolerant of 108vac to 132 vac range but the Hz output will vary from 52-65 hz within those voltages. My goal is to maintain a 60Hz. output. All of the power is routed through 2 Trace engineering 4000kw power inverters. I also have 2 1400 watt solar arrays feeding the inverters. My batteries are undersized but that is another discussion altogether. This should give you the broad vision of what im doing.