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Car Forum / Driving, Maintenance, Tuning / RVs / May 2007Onan Gen Problem
I ran carb cleaner through the carb until it died and let it sit over night. Once I blew out the carb cleaner and the generator started running normal, the AC now kicks on fine. However, when I start the microwave with the AC on it will still bog down and die. AC is 15K BTU (2000) watt and the micro is a max 1000. shouldn't the 4000 generator handle that load? Thanks for your help. Ken >I ran carb cleaner through the carb until it died and let it sit over > night. Once I blew out the carb cleaner and the generator started > running normal, the AC now kicks on fine. However, when I start the > microwave with the AC on it will still bog down and die. AC is 15K BTU > (2000) watt and the micro is a max 1000. shouldn't the 4000 generator > handle that load? Thanks for your help. Ken You should take the float bowl off that carburetor and clean the main jet. Pull one bristle out of a wire brush and poke it through the main jet orifice. That should take care of the problem. Carb cleaner through the mouth of the carb won't get to the main jet. Harry Harris  SignaturePosted via a free Usenet account from http://www.teranews.com > I ran carb cleaner through the carb until it died and let it sit over > night. Once I blew out the carb cleaner and the generator started > running normal, the AC now kicks on fine. However, when I start the > microwave with the AC on it will still bog down and die. AC is 15K BTU > (2000) watt and the micro is a max 1000. shouldn't the 4000 generator > handle that load? Thanks for your help. Ken I will try that. I actually force feed the carb cleaner through the fuel inlet nipple under about 10 PSI and ran it untill the carb cleaner killed it. Then let the excess out of the bowl before restarting about 10 hrs later. Air conditioners take a high start up current, more current than when running steady state. Are the 2000 Watt and 1000 Watt figures AC input power to the units or output/cooking power? http://en.wikipedia.org/wiki/Microwave_oven Says: "A microwave oven only converts part of its electrical input into microwave energy. A typical consumer microwave oven consumes 1,100 W AC and produces 700 W of microwave power, an efficiency of 64%. The other 400 W are dissipated as heat, mostly in the magnetron tube. Additional power is used to operate the lamps, AC power transformer, magnetron cooling fan, food turntable motor and the control circuits. This waste heat, along with heat from the food, is exhausted as warm air through cooling vents." If your micro is similar than 1000 watts cooking power requires almost 1600 watts AC power. http://en.wikipedia.org/wiki/Air_conditioner Says AC has an efficiency of 40%, let's say it is 60%. Your 2,000 watt unit needs nearly 3400 watts. 3400 watts + 1600 watts = 5000 watts. Your generator is probably overloaded. Hope this helps! > Air conditioners take a high start up current, more current than when > running steady state. [quoted text clipped - 27 lines] > > Hope this helps! That's a damned good post there, Jonathan. It may well be his generator is overloaded. But, overloading it will only cause it to labor if the carb is doing it's job. Since it cuts out and dies when under a load that tells me it's not getting enough fuel through the main jet. It leans out and dies when the demand for fuel is high. That's the main jet's business to supply it. So the first order of business is to make sure the main jet circuit is clean by physically cleaning it by poking that bristle through it to remove lacquer or dirt or whatever. Once that's taken care of and it still bogs down but continues to run then I'd agree it might be overloaded by the appliances. Have you heard that generators have a "surge" capacity above their rating to cope with appliance start up demands? I think this is the case with modern gensets. Harry Harris SignaturePosted via a free Usenet account from http://www.teranews.com > Air conditioners take a high start up current, more current than when > running steady state. [quoted text clipped - 26 lines] > > Hope this helps! They are the max power at start up so it should be reduced once they start up. I have run everything in the trailer at once before, AC, Micro, lights, refer, etc. > I ran carb cleaner through the carb until it died and let it sit over > night. Once I blew out the carb cleaner and the generator started > running normal, the AC now kicks on fine. However, when I start the > microwave with the AC on it will still bog down and die. AC is 15K BTU > (2000) watt and the micro is a max 1000. shouldn't the 4000 generator > handle that load? Thanks for your help. Ken I think the load from both the microwave and the air conditioner is too much for a 4K unit. Use one or the other. Your gen is working fine now. I think. John Andrews, Knoxville, Tennessee > > I ran carb cleaner through the carb until it died and let it sit over > > night. Once I blew out the carb cleaner and the generator started [quoted text clipped - 6 lines] > is too much for a 4K unit. Use one or the other. Your gen is > working fine now. I think. I don't believe that's correct. We have an Onan 2800 and even it can run both our 13.5K BTU AC and microwave without any problem, as long as the AC is turned on first and allowed to stabilize. |
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