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Zomeworks has manufactured thousands of passively cooled outdoor battery cabinets. Heat is radiated from the plenum lid of the cabinet to the night sky which cools water that then accepts heat gain during the day from the batteries and the environment .Electronics can be cooled in the same way but usually the heat load is too great to be dissipated by radiation and convection from the lid alone. In the past few years we have done extensive work on cooling higher fluxes, several watts per square foot of cabinet floor, by using various vertical radiators with inner water storage. Vertical PVC pipes, flattened above their exit from the cabinet proved good radiators, as did round pipes with central floats. In both cases the part of the pipe inside held the water cooled at night. Good performance was achieved but we worried about the lifetime of the exposed PVC pipes.Our next experiments were with 3' x 4' external vertical steel plenums plumbed to 20 gallon tanks inside the cabinets. This has proven to be a satisfactory cooling method for fluxes of up to 20 Watts per plate when the temperature inside the cabinet is allowed to approach the daytime high temperature. The performance is determined by: 15-3