What would cause a 2020 open Range rv lights to dim

[Cheesebrain1]

I have a 2020 open range rv that is connected to a power box. Randomly the lights will dim and the refrigerator will start flashing low dc. When I go outside the surge protector says it’s getting plenty of power and when I unplug it and plug it back in everything goes back to normal and the low dc goes away. I replaced the surge protector thinking that was the problem but the issue is still occurring. Any tips you help. Thank you

 

[JKJavelin]

Maybe more info is needed here. Hopefully someone with more electrical knowledge than me will jump in.
Surge protector only, or EMS?
30 amp or 40 amp cord to pedestal?
Fridge on propane (12 volt control), or 12 volt only?
Battery type, AGM, lead acid, lithium?
JK

 

[Cheesebrain1]

I have a surge protector with a 50 amp cord and the fridge goes low dc on propane or power. I put in a new converter and still having the same issue

 

[Rigdon]

It's likely low 12v DC power from the battery or a defective battery. They usually last maybe 5 years and you're approaching that.
Check your battery voltage itself.

 

[jarhead-ORO]

If you take the battery out to have it checked make sure to mark the battery cables. If you cross them you'll blow the fuses on the inverter.Dave