3000W Chinese Gensets Info.
professor95 wrote: EDIT ADDED 45/5/2013- When this thread started in March of 2005, I never expected to see it survive this long or amass the quantity of information that has been shared here. In...
Forum Discussion
daytona7 wrote:
Professor, Thanks for the pictures! Remember, a picture is worth a thousand words. In my case they are worth checking 975 postings to find what is needed. I'm very sure your latest posting will be very useful to other (lazy like myself) new commers.:o
Leon,
Just to add some additional information that might be helpful. The fan I am using is one of two I found in a U-Pick-It auto salvage yard. I "think" the fan came off a Honda's radiator, but I honestly can't remember since I have scrounged way too many parts off wrecked cars. The blade is 12" and the fan frame 14". A RV "Fan-tastic" vent fan would most likely work well too - but at a high price retail.
Anyway, if you look closely at the photo below you will see a small power cord coming out of the 120VAC duplex outlet on the generator and disappearing into the fan box. Inside the fan box is a relay with a 120VAC coil that automatically switches on 12VDC power for the fan when the generator starts. The 12VDC power for the fan is drawn from the RV batteries. With a 9.5 amp draw from the fan a typical fully charged group 24 RV battery can run the fan for at least eight hours before the voltage begins to drop enough to effect fan speed. At some point a battery charger will need to be employed if the generator is used for an extended period of time.
Any fan, 12VDC or 120VAC, powered from the generator will eventually reduce the wattage available for other appliances - like an air conditioner. I have found that the 12VDC fans are easier to find, cost less and ultimately have the right size blades and motor to do an excellent job of exhausting hot air. Unfortunately, the issue of powering a 12VDC fan is slightly more complicated since the generator cannot directly supply the needed 12VDC and amperage required.
One more issue to consider..... if the air intake for the carburetor is inside an enclosure that uses an exhaust fan it is possible for the air inside the box to have a negative static pressure. This occurs when the air intake opening is too small for the CFM of the exhaust fan. With the negative static pressure the carburetor does not function properly and engine performance drops. In these cases it is a good idea to modify the air cleaner so outside air is used.
Have fun with your project.
