Searching the Internet you will find many varieties of Electronics dummy load projects. You will need this device when you want to create a load in your circuit, or to see how your well your battery or solar panel holding up. When you think creating a load that light bulb in your junk box no longer kick it, perhaps its time you need to buy or make your own dummy load device.
Even if you decide to buy, do your own research so that you know what you need.
We made one during last Christmas holidays, it was a fun project and it is a very useful tool.
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