Way too many variables to say yes, buy this model, "xyz123".
Generally speaking, cooking with electricity at home on grid power is cheap and efficient, but all that goes away when you have to generate and budget the power to run an electric burner or stove several times a day.
Cooking with propane IS very cost-effective...but it also has some limitations and concerns, especially in a small closed-in area, such as the back of a minivan.
Induction cooktops are slightly more efficient than a normal resistance cooktop in some situations...but they are not the clear winner in every scenario.
If you want to cover all bases, keep a propane camp stove for those days when solar power is low or limited, and a 1000w cooktop (hot plate or induction) for times when solar power is plentiful (assuming you have the inverter, battery capacity, and solar capacity to keep it working).