Customised fridge/freezer

Industrial Insulation Systems (IIS) has developed a solar-powered fridge/freezer that can be tailored to meet the needs of off-the-grid scenarios.

The custom made-to-order IIS solution will maintain temperatures as cold as -20°C for at least 24 hours between charges. This is according to the company’s Jason Luedtke, who stresses that with the (up
to) 400amp hour battery capacity and the solar panels working in harmony as well as regular exposure to sunlight, users should be able to go completely off-grid indefinitely.
“Our initial goal was to create a unit that would maintain the power source to the fridge/freezer for three full days with no sun exposure,” says Luedtke. “Our prototype testing proved that the unit maintained adequate power to hold temperature for nine days, before we drifted out of proper temperature range. We considered this a success but each unit (based on size and therefore power draw) and ambient temperature will have slightly varying results. Ambient temperature during the above-mentioned test was 25°C on average.”
“The batteries are a crucial element – even during consistent full sun. Both elements must work in a regulated balance for the system to be nearly perpetual,” he states.
“If you already have your own lowvoltage (DC) fridge and would rather not pay extra cash for a new one, then you can just buy the solar kit and fit it to the fridge,” says Luedtke.
He explains that the solar panel canopy works in balance with batteries to make sure that the chosen unit doesn’t run out of power. “If you want your fridge kept out of the sun then you’ll need extra long cables to link it up with the solar canopy, which can then be optimally placed to get the most direct sunlight. You might need extra storage  space on your trolley if you intend to use your unitfor street vending. You may also need some air conditioning outlets.
“Alternatively, users can pick the model of fridge/freezer from our range, tell us how to mount it, then how to power it, and we’ll customise it to fit their optimal needs,” Luedtke concludes.
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