I have been working on solar electric cooking systems which are appropriate for the developing. The system I think has the most promise is a solar direct system,no batteries. Thermal storage allows hot food to be eaten 5 hours after sunset. A single 280 watt PV module would supply all the energy needed to cook a days worth of food for a family of 5.
A spin off from this project are two potential products for the cold chain, A pressure cooker (sterilizer}. With a 280 watt module the pressure cookers contents could be sterilized in about one hour.
A second application would be a syringe melter and sterilizer. Needles would be encased in the melted plastic. The volume reduction would be about 70%. For convenience syringes would be dropped directly into the melter. The melting process would take 2 to 3 hrs. The melter could be powered by a 280watt module.
Power for these processes could be supplied by a 280 watt module. When the power is not needed for sterilizing or processing syringe waste it could be used for making hot water, cooking or battery charging.
If the clinic is using an SDD refrigerator for several hours a week the array could be switched to either power a sterilizer or syringe melter. This switch would be on a timer so that the SDD refrigerator is reconnected in a few hours. This switch would be made during sunny weather. Under sunny conditions the array for an SDD refrigerator is considerably over-sized..