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Solar Wax Extractor

This page is credited in full to Dave Cushman who created it. His voice is expressed in black colour text and any additions or comments in blue belong to myself. Credit: Dave Cushman’s website.



Solar Powered Wax Extractor

Solar wax extraction is popular with beekeepers as the energy source is free. Beekeepers are known for a prudence and frugality that borders on the miserly.

The solar powered wax extractor is a device for melting beeswax from old comb or part rendered blocks, that is powered by the sun, has no moving parts and can be left unattended.

There are many plans regularly published in beekeeping magazines. But before you make one… Consider how you will use it. My personal one is rather small as I was working around an existing metal reflector, but if I were making one now I would make it large enough to accept a stack of ten framed queen excluders.

Principle of the solar wax extractor All it amounts to is… a simple box with a hinged lid that is double glazed. There is a collector for the melted wax and a metal tray that has an “8” mesh filter at the bottom end. The whole device is arranged so that the face of the double glazing is perpendicular to the angle of maximum insolation.

The device that I have in my back garden is similar to the diagram, but the box is insulated by expanded polystyrene sheets on the outside and then the outside of the insulation is further covered by a skin of shiplap boards. Even with this extra insulation it only runs well on days with clear blue sky and summer sun. It will deal with a kilo of wax per day if the sun shines and it will cope adequately with my current needs.

Greenhouse glass is recommended for the glazing and the uppermost sheet overlaps the reduced top edge of the bottom part of the frame to allow rainwater to run off without collecting or penetrating into the box.

The mesh along the bottom edge of the melting tray is intended to strain out any large particles of debris and stop them reaching the collecting tray. I found that a certain amount of particulate debris would still find it’s way into the collector and so I took some cotton twine and wove it in and out of the holes in the mesh. The fluffy nature of the twine retains the debris, but allows the liquid wax to flow unhindered. The large particles and cocoons remain on the metal tray and after draining under the influence of a hot sun for a day or so after the main melting the sludge is scraped out and I discard it. It can be used for garden compost or as a fire lighting medium. There is also a method (Slum Gum Press) by which the remaining wax can be removed. (When time allows I will detail it.)

When I was in business I designed a very large specimen that I intended to put on the factory roof… It was never completed although many of the parts had been made and the reflectors, that were made from cast aluminium rainwater guttering, had been fettled and polished. Eventually there will be a page about it accessible from the link at top left.

Ladies’ tights (panty hose) can be utilised in Solar extractors… The rough quality wax and old comb are stuffed into the legs and then tied off. The sausages so formed are put in the extractor and the fine mesh retains a good deal of the debris whilst the molten wax runs easily out.


The further north the less successful sadly.


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