Generator output opinion

[Scott Off Grid]

Hello everyone,
I am making progress putting my off grid Sol-ark 15k and pytes battery system together. I was finally able to get my generator connected to the inverter and working correctly yesterday. It is a Duromax 12000 generator running on propane, so continuous output is about 9000 watts. I have been playing with the amp draw and the rpm to maintain the 60hz. I'm up to 4400 watts currently.
My question, is there an opinion on what percentage of continuous output that is a good point to shoot for?
100% - 9000w
80% - 7200w
75% - 6750w
50% - 4500w

 

[Zapper77]

I don't know where or if it's just my imagination.

I recall reading or hearing 50-75% is the best range for fuel efficiency.

 

[BentleyJ]

Generators are classified in 2 broad categories. Standby and Prime. Most consumer grade generators are standby type and are for limited use during outages or for camping and such. Limited being defined as 200 hrs per year of runtime with the average load being no more than about 75% of rated capacity.
Based on a brief review of the Duromax 12000 specs., its actually rated at 9,500W continuous. The 12,000 is surge. With propane, the output would most likely be reduced to 9,000W as noted above.
Best case, your average continuous load should not exceed 6,000 to 6,500W with brief excursions up to 8,000W.