Shipping of product by sea freight can offer an economical alternative to air shipping, but the extended duration of transit can pose a challenge for temperature-sensitive payloads. While the use of active, temperature-controlled shipping containers can provide protection for temperature-sensitive payloads during ocean transit, there are times during the shipping process in which the container will be disconnected from power. These periods during which the temperature control is powered off can vary in duration, and may result in temperature excursions, negating the cost savings of shipping via ocean freight.