Im not 100% sure this is true, though im trying to figure it out definitively, Ive been using a modified sine wave inverter for quite a while and havent had any problems yet, and so have quite a few other people ive talked to. the one wilkia61 linked about doesnt even state what type of wave it produces unless i missed it? possibly modified wave inverters are much better quality these days and it doesnt matter near as much or at all anymore like it used to? At any rate a pure wave inverter would seem to be the best option, but they cost more and if there really isnt any problems with the cheaper modified wave ones you might save some cash.
Im trying to find out the actual factual truth about it cause i have two modified wave inverters i use to charge mine. One in my f350, and one in my 5th wheel RV. If i didnt have any I would probably just go buy a pure wave one and forget about it but since i already have two id really rather not have to replace them both if its not necessary. You can follow this other thread here if youre interested, might eventually figure it out one way or the other in it.
Car charging using 300W 110V AC modified sine wave inverter? | DJI Inspire Forum