this post was submitted on 17 Jun 2024
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will i damage my car electrical system with a 24v solar panel (reddthat.com)
submitted 5 months ago by batvin123@reddthat.com to c/askelectronics@discuss.tchncs.de
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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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[โ€“] RaoulDook@lemmy.world 10 points 5 months ago (1 children)

Sounds like a bad idea unless the power input can handle 2 different voltages into the same place (at once?).

If it can handle both at once, you could still damage the car by feeding 24v into a 12v output port. It might blow a fuse, or burn up a circuit, or do nothing.

But it might be possible to install a diode or diodes in the line to prevent power flowing back into the car. Diodes are like one-way gates for electricity, but it would need to be the right kind and rated for the volts/amps going through it

[โ€“] Revan343@lemmy.ca 7 points 5 months ago

you could still damage the car by feeding 24v into a 12v output port. It might blow a fuse, or burn up a circuit, or do nothing.

OP didn't specify the car, but if this is an ICE vehicle, the lead-acid battery is not going to appreciate being fed 24V