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12v 150w pure sine wave inverter causes MCU to freak out!


2015 S85 AP1
May 25, 2019
Orange County
So I recently bought a 150w 12v pure sine wave inverter to be able to charge my laptop and drone batteries. My laptop only uses 60w and the drone charger uses 87w. When I plug it in, the MCU freaks out and is unusable. Watch the video for reference. Any ideas on what could cause this? Maybe my 12v battery is going bad? I haven't received any error messages

my MCU was replaced last year so it shouldn’t be the issue



Active Member
Oct 29, 2016
What power source do you have your inverter connected to? If on the same power feed as MCU, it could be a power or voltage drop issue.


Mar 7, 2019
@Lectric_Agent, you really had me worried. I just bought a 300W inverter last week for a planned camping trip. I know the 12V will only provide 150W max and that will be plenty for our e-cooler and my CPAP. However, I hadn’t tested the inverter yet...until now, after seeing your post.

As I’m typing this, I have the S in Camp Mode, 68W eCooler and 65W work laptop both plugged into the inverter while I’m watching Hulu on the screen. It has been about 10 minutes and no issues so far.

EDIT: Like OP, I also made sure to get a pure sine-wave inverter.

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