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
Again agreed,
In thinking about the Honda some thoughts are~ There are no sound lowering panels, no wrapped muffler. The inverters are a different bread of cat. Inverters allow for a lower RMP with lower demand and give a lower sound level with lower RPM. The open frames all operate at 3600 rpm and most have the same sound level as reported. MrWizard has it right idea 'cooling design is a major factor' I like this part. ~ 'very efficient no scatter'. The air flow on the open frames, not the same. Air flow from the engine follows a path over the engine then to the muffler. If a wall is created at the genhead end, that hot air will be the air intake to the genhead. Not good. But workable. The air exhaust from the genhead fan is down and out from between the engine and genhead. This presents a inherence, but must be taken into consideration. This is my finding. There is a need to isolate the air intake from both ends. But. I like what Bob R has to say "what could possibly go wrong" Welll, for one, if sound lowering is the idea, the openings resonate the sound from a enclosure. Just one man's opinion. Now if you enclose the genset with only one air intake as shown on my MH installation, a 1150 cfm 12v 80watt fan is used at the location of the genhead exhaust. Down and out. One intake, one exit. That took care of the heat and lowered the sound level, with the material used to, 60 dBA @ 7m straight out after several checks with a meter from Radio Shack. This is NOT a simple solution. These open frame gensets are PORTABLE and a solution for sound lowering should also be PORTABLE. There are thousands of open frames in use by RV folks who want to be kind to their neighbors. Perhaps this thread will meet that need.
Floyd
In thinking about the Honda some thoughts are~ There are no sound lowering panels, no wrapped muffler. The inverters are a different bread of cat. Inverters allow for a lower RMP with lower demand and give a lower sound level with lower RPM. The open frames all operate at 3600 rpm and most have the same sound level as reported. MrWizard has it right idea 'cooling design is a major factor' I like this part. ~ 'very efficient no scatter'. The air flow on the open frames, not the same. Air flow from the engine follows a path over the engine then to the muffler. If a wall is created at the genhead end, that hot air will be the air intake to the genhead. Not good. But workable. The air exhaust from the genhead fan is down and out from between the engine and genhead. This presents a inherence, but must be taken into consideration. This is my finding. There is a need to isolate the air intake from both ends. But. I like what Bob R has to say "what could possibly go wrong" Welll, for one, if sound lowering is the idea, the openings resonate the sound from a enclosure. Just one man's opinion. Now if you enclose the genset with only one air intake as shown on my MH installation, a 1150 cfm 12v 80watt fan is used at the location of the genhead exhaust. Down and out. One intake, one exit. That took care of the heat and lowered the sound level, with the material used to, 60 dBA @ 7m straight out after several checks with a meter from Radio Shack. This is NOT a simple solution. These open frame gensets are PORTABLE and a solution for sound lowering should also be PORTABLE. There are thousands of open frames in use by RV folks who want to be kind to their neighbors. Perhaps this thread will meet that need.
Floyd
