We were asked, by a good friend from Wild Stoves, to produce a portable solar PV off-grid power supply system.
Wild stoves supply equipment for efficient outdoor cooking on wood. They run workshops on efficient burning of wood and sell equipment at a number of festivals over the summer. We had been asked to add solar to their 50's caravan a few years ago.
They wanted to be able to provide higher levels of energy to the festivals they attend, but wanted all the equipment to be portable, all parts to be moveable by one person and to fit within a specific space (within a Land Rover and then under a caravan).
Together we designed a 3 box unit with 200Ah of Lithium Iron Phospate batteries at 24V DC, an 800W solar PV array with MPPT and an 1200W inverter unit. This also has battery montioring, various controls for the outputs and 12V outputs for each box.
This post covers the design, build and testing of this system.