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Diesel or natural gas?
Diesel , natural gas generator sets are much smaller and limited in output. This is coming from my design of sewer pumping stations as sizing pumps smaller was favorable to avoid maintenance and fuel turnover problems with diesel backup generators.
 
Diesel , natural gas generator sets are much smaller and limited in output. This is coming from my design of sewer pumping stations as sizing pumps smaller was favorable to avoid maintenance and fuel turnover problems with diesel backup generators.
Cummins (and Caterpillar) both make some pretty big NG gensets. Just going by the physical size, it looks about the same as a Cummins 4BTAA3.3 (diesel), which goes up to 60kW. An NG counterpart would be the Ford V10 unit, at 60-75kW, the QSJ8.9G (NG) looks physically a bit too big, and is 100-200kW.

Biggest one I see for diesel on their website is 3.5MW, while NG is 2MW, both obviously much larger than this application.
 
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