why?
practicalities: we needed one. ;-) We can run an amplified event in any location without a mains supply, and without the drone of a generator constatly running, only the gentle whirr of bicycle wheels. For quieter events we can run the amplifiers for a while on a fully charged battery, making sure we recharge the battery afterwards.
politics: it is a great demonstration of not only what can be done, but how much physical effort is required to power something we take for granted - i.e. loud music. We don't do any formal educational work, but are happy, at appropriate times, to discuss the system; this website is part of that.