Hi im looking for some guidance for a temporary outdoor lighting installation at a festival. I want to run 18 x 10m lengths of low voltage LED fairy lights [these](https://www.lights4fun.co.uk/i/q/CE14S100-YWC/100-warm-white-led-connectable-clear-cable-fairy-lights) ones.

I have some large 12v batteries and a step up dc dc boost converter like [this](http://www.ebay.co.uk/itm/141694769933?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT) Can i just simply boost the 12v to 31v required by the lights and run all 18 strings of one supply? operating times will be no more than 6 hours in a 24 hour period. I was told each LED is 0.007W so with 100 leds per string i will have to run 1800 LEDS. Whats the best way to achieve powering this with 12v?

I have some basic electronic skills/soldering etc..

Many Thanks
Al