Bought this (because I had a 12v wall wart) to run a single 3m section of wire. Hooking the 3m length of wire to the 12v inverter made the inverter smell of O3, from my single test it seems 3m isn't enough load for this inverter (as other posters have mentioned). The "hum" was very loud and the 'blink' setting was not functional.
To remedy this I put a 10nF cap and ~180K ohm resistor in parallel with the EL wire (all 3 components are in parallel with each other + the inverter), this simulated having 2m more EL wire inline with the single wire. Hope this helps others, tracking down the formula for EL wire took some time.