Energy Transfer Apparatus - Malvern Mounded Motor for Solar Cell. This is a small low consumption electric motor on a base specially designed to run directly from the output of the solar cell and to illustrate the direct conversion of light energy to electrical and hence to mechanical. Fitted on a base with a 2.5" fan and 4mm sockets. Base is 4" long, 3" wide, and 1.3" tall. Great for any school or home laboratory. Energy Transfer Apparatus - Malvern Mounded Motor for Solar Cell. This is a small low consumption electric motor on a base specially designed to run directly from the output of the solar cell and to illustrate the direct conversion of light energy to electrical and hence to mechanical. Fitted on a base with a 2.5" fan and 4mm sockets. Base is 4" long, 3" wide, and 1.3" tall. Great for any school or home laboratory.