The charge that lights up the EL wire is Alternating Current which typically does not experience loss of power the way DC current does. I think you will be fine if you are running your EL Wire Inverter at 75% capacity or less.
BTW I have no electrical training what so ever....Just an accumulation of knowledge from my nearly 39 years.
Someone will be round to help you in a more precise manner shortly.
Stag Camp 6, 2012. Black Rock City Welding and Repair. Potty Project team member.
When you pass the 4th "bridge out!" sign; the flaming death is all yours.-Knowmad-