Corrosion on Inverter ANL Fuse in Battery Compartment

[CaspersCruiser]

On my 2012 R27, the battery-side terminal on the inverter ANL fuse in the battery compartment had a fair amount of corrosion around the edges. I removed the plastic cover over the fuse to investigate further. To release the fuse cover, depress the middle section of the cover towards the fuse body. The one on my boat was fairly difficult to get off to the point I was afraid I would break it.

I’m glad I looked closer. When I removed the battery-side terminal, I could see the corrosion had spread under the washer and nut so completely that it nearly covered the surface on both sides of the terminal. I’m surprised the inverter still functioned normally. I cleaned up the battery side terminal and then removed and cleaned the inverter side terminal which wasn’t nearly as corroded. I removed the inverter ON/OFF rotary switch and cleaned those terminals.

While I was at it, I cleaned both terminals on ANL fuse in the engine start circuit. They had mild corrosion that I would deem normal given the age of the boat.

I also removed and cleaned the terminals on the automatic charge relays. They, too, had nominal corrosion.

I suspect that the inverter terminal corroded because of the light use it gets.

I put a couple pictures of the corroded terminals in my photo album.

 

[GaylesFaerie]

Same year, same boat, same trouble with the fuse cover, same corrosion condition, and did the same preventative maintenance this spring to all the ANL fuses, ACR, and the Galvanic Isolator. I also made sure to cover all the connections with conductive grease to help stave off future corrosion. Battery posts too after checking fluid levels. GF

 

[knotflying]

Once a year when you want to go to the boat and idle away the hours check every connection in the battery locker and port lazaret. Remove, clean and apply corrosion block or some corrosion inhibitor. I also pull each fuse and check the blades and the receivers. Also check the raw water switch, that definitely needs attention. Also hit all the cockpit lights and switches. Check and clean the neutral and ground buss. While you are at it check the connections on battery cables to inverter. You will be surprised at how fast 8 hours will go by.