MetaFridge operating at a Central African hospital with 3-6 hours of generator power each day — the facility has two generators that operate at different voltages. The vaccine chamber temperature remains steady while the ambient temperature varies throughout the day, with chamber temperatures only increasing when the chamber door is opened. During this time period this unit has a duty cycle of 6.3% and average energy consumption of 0.42 kWhr/day at an average ambient temperature of 35 °C.
MetaFridge immediately after installation at a Central African clinic with intermittent mains power and fluctuating voltages. PowerMinder voltage stabilization allows the MetaFridge to utilize low voltages and cool down when power is available. The vaccine chamber is cooled below 8 °C after the MetaFridge has received just 4.5 hours of power over 1.5 days, and after receiving 11 hours of power the unit has built up 5 days of holdover.
The MetaFridge remote monitoring system sent an alarm for elevated temperatures. Technicians noticed that the high temperatures occurred after door openings. A phone call to the facility revealed that the door was left slightly open (but not far open enough to trigger the door sensor), and the temperature returned to normal after the door was closed properly.
MetaFridge ColdSafe technology maintained safe vaccine temperatures at an East African clinic throughout 8 days without power followed by additional multi-day outages. The refrigerator was used normally with daily door openings throughout the outages. Nurses were able to see on the display that the holdover time never dropped below 2 days, assuring them that the vaccines remained safe until technicians were able to visit the clinic and repair the electrical outlet.