With sustainability in mind, and trying to do something new, I am looking forward to charge my car battery using Solar Power, without making much changes to my car's electrical system.

Basically I want the alternator and solar power to charge the battery to a certain level, lets say 13V. The rest 1-1.5V, I want to charge using solar power only, taking the battery upto 14-14.5V. Meaning if solar power isn't available (night driving/cloudy day etc), at least the alternator charges the battery to a certain extent to keep the car working as expected(starting etc).

For the solar power, I will make use of a solar charge controller, charging the battery to a configurable voltage between 12.5-14.5V.

My question is, how do I limit the alternator to ¬13-13.5ish V ? Is adding a diode from the alternator to the battery a good and sane option ? Lets say this diode seems to do the job, as my car alternator outputs a maximum of 70A.

Is there a better way to achieve the above mentioned ?

  • Modern alternators systems are trouble free , why screw with it. From the perspective of someone who grew up with generators and voltage regulators - nearly always a problem. Sep 10 '19 at 16:00

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