"Amb Temp" on Generator Nameplate

I think it is misspeld. it shoud be amb temp. This is the temperatur or the surrouding air, to cool the generator. Mostly it is 40 degree Celsius.

If the surrouding is hotter (dessert, close to a heat source), you can not use the total capacity of the generator.

I think it is misspeld too. It should be desert, not dessert.

amb temp = ambient temperature.

am·bi·ent   [am-bee-uhnt] –adjective 1. of the surrounding area or environment: The tape recorder picked up too many ambient noises. The temperature in the display case was 20° lower than the ambient temperature. 2.completely surrounding; encompassing: the ambient air.

Drew

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Could be "ambiance, temporary" as in the mood musing and lighting surrounding your generator when you are there to repair it. I here they want candles and soft jazz with a little potpourri sprinkled around.