Swinging voltages, see video link

[hollygrail]

Any idea what would cause these big swings in voltage in a Roadtrek Zion? Note I did upgrade to smart Li batteries many months and trips ago, this is just starting. The lights get brighter with higher voltage. I just do battery disconnect switch because I'm scared of causing damage. I have 300aH of renogy smart LiFePO4 professionally installed with solar and renogy solar charge controller. Again, was fine for a long time. My service appt isn't until June 16 😭 I noticed this happen one time when the car was running so I thought it was from alternator charging but it is doing it with car off now. Inverter is never turned on when this happens.


Video:
https://photos.app.goo.gl/LcUH9Qh1mgd7z5tq7

[mkguitar]

Hi, unable to see video...no load
I use google photos routinely



anyway if I were seeing swings in voltage in a static system, I'd be looking first for a high current draw with an ammeter


and secondly for a failure in the supply in this case a battery...feel anything hot?


that's where resistance is occurring


I have no familiarity with the system in your van



I'll try the viddy later


cheers, Mike

[hollygrail]

Good news, disconnected solar charge controller and all fixed. At least I isolated the issue! Hoorah. Facebook group for Ecotrek free Roadtreks was totally on this and amazing.