I replaced our Magnum MagnaSine internal cooling fans due overheating failure and thought I would walk though doing it. When the lights go out it could be your inverter overheating due to cooling fan failure.When that happens the inverter/charger overheats and shuts down to cool and then turns back on over & over again. You may care to check the cooling fans which seem to have a useable lifespan of 5 years. The fans were $38 shipped and here is where I found them....
Part: https://inverterservicecenter.com/mag...