Ohhh, and also, the foam insulation in your smoker MAY or MAY NOT be suitable for higher temps.
It was package designed within it's wattage, so anybody's guess how high it can go or not.
We do not know exactly what the foam is, so we can't even research the temp limits.
So overall, I would not consider upping the wattage.
But again, you don't need to in most uses.
Main question is poultry skin crisping.
Many will finish that on a direct grill, or briefly in HOT preheated oven, like 425/450.
Some find it sufficient off the Digital smoker, but MANY say skin is "rubbery", NOT crisp at lower cooking temps.
But, yes, IF you had the 1500w, in a suitable chamber, then no need for seperate additional hassle with other appliances.
Just crank the temp up last 15 minutes at least, or just cook around 350f +. Marc