Here is a link to solar power potential in Mexico. One of the potential areas, Matehuala, Mexico, appears to have at least 4-5 hours of sun each day during the year. The city has a temperate climate with an average year round temperature of 64 F.
Here is a design for a solar fridge I found at SunDanzer's website. These refrigerators alone cost from $699-1249 and the cost of the batteries, solar panels and control systems could match those prices.
Using the weather information (with safety factor of 1.5 for temperature, 96 F) a 5.8 cu. ft. refrigerator would require 320 Watts of power and need a 133 W (PV rated) solar panel (at 5 hours of sun per day) and a battery rated at 259 Amp-hrs. Gathered the information from this table. The total cost of this set-up would approach $1800 for the fridge ($1149), battery ($250) and solar panel ($400). It would of course cost more because control system, packaging of components and shipping have not been included.
Check out the new link that details Dr. West's contributions to families in Mexico.
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