In developing countries, kerosene powered vaccine storage refrigerators are gradually being replaced by PV powered units. The weak link in these solar powered systems is typically the deep cycle battery bank. When the batteries fail, replacements will probably have to be imported. Often the logistics of funding, recycling and transportation of these batteries may be difficult to arrange. Sun Frost has developed a accine refrigerator that will run on a single 100 amp battery, an automotive battery if need be. Vaccine is stored in the refrigerator section of these units, while the freezer section is used to freeze ice packs to transport the vaccine. This new dual compressor model keeps the battery bank in a shallow cycle mode by shutting off the freezer compartment when the battery is significantly discharged. The PV system can then keep the refrigerator compartment running while shallow cycling the battery even during the most severe by using daily solar data. Results show that the operation of the freezer will rarely be interrupted. Another advantage is that if this system is installed in a location where insolation levels are lower than expected, the refrigerator compartment will maintain reliable operation for keeping the vaccines cold, while only the freezer's ice making capabilites would be effected.
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机译：在发展中国家，以煤油为动力的疫苗存储冰箱逐渐被光伏动力装置所取代。这些太阳能系统中的薄弱环节通常是深循环电池组。当电池出现故障时，可能必须进口替换电池。通常，这些电池的资金，回收和运输的后勤工作可能难以安排。 Sun Frost已开发出一种疫苗冷藏冰箱，该冰箱将使用一个100安培的电池运行，必要时可使用一个汽车电池。疫苗存储在这些装置的冷藏室中，而冷冻室则用于冷冻冰袋以运输疫苗。这种新的双压缩机模型通过在电池明显放电时关闭冷冻室，将电池组保持在浅循环模式。然后，通过使用每日太阳能数据，即使在最严重的情况下，PV系统也可以在使电池浅循环的同时保持冷藏室运行。结果表明，冷冻机的运行极少会中断。另一个优点是，如果将此系统安装在日照水平低于预期水平的位置，则冷藏室将保持可靠的运行状态，以保持疫苗低温，而只有冷冻机的制冰功能得以实现。
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