Xenon lights 477 should have at least a 750 A capacity; when three 70,000 W heads are used, the plant should have at least a 1200 A capacity. A sudden heavy load like that of Lightning Strikes! affects all the lights on a generator. They may blink each time the strike hits. To guard against surge current affecting the set lighting, most gaffers order an additional generator to handle the Lightning Strikes! units. If you have to run both on the same generator, use the smaller units (70k or less), keep the bursts short, and have no more than half the amperage capacity of the generator devoted to lightning units. Thundervoltz battery packs Alternately, Thundervolts battery pack units eliminate the problem of putting large sudden loads on the generator. All Lightning Strikes! units (except the 25k) can be run off Thundervoltz battery packs. These are specially designed oversized battery-powered packs with an inverter and charger to provide AC specifically for Lightning Strikes! units. The packs deliver power enough to flash the units indefinitely, as long as the AC charger is connected to a power source. The 450-lb Thundervoltz runs two 40k units or a single 70k unit. The 1300-lb double Thundervoltz runs two 250 kW units or a single 500 kW unit. The battery packs are mounted on heavy-duty pneumatic tires.