When considering which solar vaccine fridge to buy, do purchasers use the results of autonomy or holdover tests to inform their decision?

In the WHO PQS test protocol, the holdover test measures performance of the appliance without any power supply, whilst the autonomy test looks at the performance with a reduced (5%) power supply. For Solar Direct Drive fridges (without ancillary batteries), autonomy testing is a requirement even though the 5% power supplied during the testing period is inadequate to power the compressor, nor is it used to power any additional cooling device such as a fan or flaps.

 The protocols for autonomy and holdover testing in these appliances are identical in most respects with the exception of temperature: temperature is at intervals of one minute until the warmest point in the load exceeds 8oC in the autonomy test or 10oC in the holdover test. The major difference between the two tests is that there is a 5% power supply to the appliance during the autonomy test, which in this type of appliance, does not affect the cooling in any way.

 Where long holdover times at high ambient temperatures have already been established, what additional advantage, from the customer’s point of view, do the results of such autonomy tests confer?