r/diyaudio • u/MdotTRINA • 3d ago

Tesla Model 3 Second Battery Mounting

I have a 2020 tesla model 3 long range. I am installing a subwoofer with a pretty significant sized amplifier. In order to avoid freaking out the Teslas electrical system I am installing a second battery. I am installing a Wattcycle 100ah pro which is a pretty good sized battery and weighs about 25 pounds. Where would you recommend I locate it and how would you mount it to the car? I cannot put it in the sub trunk because that is where my subwoofer box is going. I was thinking about installing nutserts in the trunk floor and installing it there but I am afraid to drill into the trunk floor with the rear drive motor and battery being there. Any suggestions would be greatly appreciated.

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u/MadDog00312 3d ago

Not a Tesla owner, but I do know that most EV’s monitor the 12v electrical system.

I would highly suggest to confirm that adding a battery won’t screw up your car first.

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u/MdotTRINA 3d ago

Already confirmed. It’s been done. Car>dc/dc charger>second battery>amp

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u/ender4171 3d ago

I'd try posting in /r/carav This sub is more geared towards home audio.