Need to test your power supply with a 20A capable electronic load? Gelbanana is designing just such a device. It’s an electronic load designed to spread the heat dissipation through 4 transistors each taking 5 Amps. So far he is testing the cooling system which consists of two massive aluminum heat sinks.
Why not use binary weighted loads, e.g. 1,2,4,8 A ? Total 15A, but with a 1A resolution!