Will Cummins Onan Onboard RV Generator Handle 2 Coleman Mach 15 AC Units On Grand Design?
Updated 08/15/2025 | Published 07/16/2025
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Question:
We live full-time in our 2022 Grand Design Solitude 375RES. I’ve got two 15,000 BTU Coleman Mach 15s, residential fridge, and a Victron inverter setup. Can the QD 6000 handle all that at once?
asked by: Crystal
Expert Reply:
Hey Crystal, the QD 6000w onboard generator from Onan with the Cummins diesel # CM94RR is right at the top edge for dual AC use. With 6,000 running watts, it can handle both 15K BTU air conditioners if they’re soft-start equipped or staggered on startup.
Your fridge, microwave, and outlets are no problem with this power level. If you’re planning to run both ACs hard at the same time and fire up the convection oven, it’s worth looking at the Onan QD 8000 # CM44RR instead. But for most travel scenarios, including hot weather, the QD 6000 is an excellent match.
Product Page this Question was Asked From
Cummins Onan Quiet Series Onboard RV Generator - 6,000 Watts - Diesel
- Generators
- No Inverter
- Diesel
- 6000 Running Watts
- Fixed Mount
- 120 Volt Output
- Electric Start
- Cummins Onan
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Andrew N.
8/15/2025
Hey Crystal, did you decide to go with the QD 6000 for your setup, or are you considering the QD 8000 for more power? I'm curious to know how it worked out for you, as it could really help others in a similar situation!