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will i damage my car electrical system with a 24v solar panel (reddthat.com)

submitted 5 months ago by [email protected] to c/[email protected]

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I have a 3d printer in my car powered by a bluetti eb3a. The bluetti is charged by the 12v outlet in my car while driving. I have a 24v solar panel i want to mount to the roof of the car. My bluetti has only one dc 7909 input. So got a a Y splitter to combine power from the car and panel. But when plug it into the car outlet that turns off when i turn off the car, the solar panel turns on the stereo. Thats not the case with the outlets that are always on. I am worried that i will danage the car electrical system from a 24v solar panel flowing electricity back into the car?

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[–] [email protected] 6 points 5 months ago

The solar panel needs to be used with a charge controller. Connecting it directly to a battery will overcharge and damage the battery. Charge controllers typically don't like the battery being disconnected while the solar panel is still connected, so don't connect it to a switched outlet.