Has Anyone Changed out the Inverter on a R25 OB?

profcbutler

Active member
Joined
Feb 16, 2024
Messages
28
Location
North East Maryland
Fluid Motion Model
R-25 (Outboard)
Hull Identification Number
FMLT2506G425
Vessel Name
TUG-GETHER
I have a 2025 R25 with a bad inverter. Worked with Ranger Tug and Kisae to determine it needed to be replaced. Besides the safety issues with removing power before I start the exchange, I am hoping someone has done this on a late model R25 to give me some tips and tricks. I am very comfortable with this type of work. However, I am trying to reduce my learning curve on the best way to remove the inverter. In troubleshooting with Kisae I removed the bottom cover panel so I know how tight it is in this area. I am trying to figure the best way to get at it. I am thinking I have to remove the entire panel (Three screws at the top). Cut a few tie wraps and pull the panel outward. How is the inverter actually mounted on the wall? Again, any insight from someone who has done this would be greatly appreciated!
 
I am posting this for anyone who may find replacing this unit helpful in the future. I figured out how to do it by taking my time. For better or worse here is how I did it.

First I disconnected shore power, pulled the cables off of the house batteries, thruster, and engine battery. Then I put a thick moving blanket over the solar panel.
With all power disabled i removed the lower panel in the cave (below the verticle panel).

This area is super tight so with an offset screw driver I lossened the two lower screws holding the inverter in. Pre-loosening this was helpful when I dropped the main panel.
Three top screws hold the panel in place. Remove those three screws then carefully pull the panel down. It won't come completely down but just enough to get your hands in there.
Next take out the top screw holding the inverter. With a bit of wiggling it should pop up and slightly out.
You only have a few wires on it. The easy ones first! Pop off the remote RJ11 connector then disconnect the nema 20 plug from the ground fault receptacle.
Only three wires left!
Lossen the nuts on the 12V dc input lines with a box wrench then remove by hand. The third wire and the toughest one to get out is the ground wire. Box end wrench that until finger loose. Again, it's tight in there but doable with patience.
It is now out!
Take the new one and get your cables back on in the reverse order (ground wire first).
After all wires are back on lift the unit and place on the screw you only loosened and did not take out (you will be happy you did not remove these at the start).
Get it in those bottom screws then put your top screw back in. This can be a little challenging. Since the screws are stainless the magnetic. Screw drivers wont hold them well. Fight through you will get them. Lots of wire up there.
Finally lift the big panel and put the three screws back in. Put that lower access panel back on and you are done. Start to finish it took me about 1.5 hours.
 
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