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Can I connect 2 solar panels in parallel if they have different Open Circuit voltage ( e.g 22V and 14V)?
Want to power a solar powered attic fan.
One panel rated at 5W the other at 10W.
Likely you can not connect them in parallel and may risk damage if you do. Consider the analogy between electric current and water flow. Voltage is equivalent to water pressure and electric current is equivalent to water flow rate. If you connect two tall water towers in parallel, water will flow from the taller tower (higher voltage) into the lower tower (lower voltage). You will likely drive electric current the wrong way through the 14V unit perhaps causing resistance heating and damage.
Solar Powered Attic Fans FAQ