Making a mobile projection unit that doesn't require HEAPS of energy is more tricky than I thought.
So there are some other possibilities...
One.
Building a slide projector:
This would need high powered LED lamp (expensive) and optician lenses (expensive.) But by FAR the most energy efficient method... requiring no power supply other than torch batteries. Too bad there isn't really any way of knowing or testing this method cheaply.
Two.
Using a power inverter and a car battery (not hooked up to the car) to run the projector:
This only requires the use of a charged car battery and a power inverter which converts the power from A/C to D/C... i think. Should be fairly inexpensive but potentially difficult to get my hands on the right inverter. Could be problematic with draining the battery quickly too.
Three.
Using the power inverter with the car running:
Not a desirable method as I'm trying to avoid use of petrol as much as possible. Again dependent on the inverter being right. However at least it would still be mobile, easy...
Four.
Using a hired petrol generator:
Don't really want to go about this method again. It cost too much to hire the generator and i want to be more flexible with multiple locations and dates/times. Also this method is not helpful because it requires that i be with the generator outside throughout the entire projection when i want to be more anonymous.
