I have two electric Lewmar 66 winches that came with the
boat, and this spring I put in two Lewmar Evo 45 winches. Mechanically, the smaller winches are the same as the manual ones where the important bits are. I think any Lewmar electric
winch that's bigger than 65 have a button to disconnect the
motor from the winch when a handle is inserted. The motors are just standard dc motors with a
gearbox. Any alternator/
motor guy can fix the motor if they go bad. Not sure about the
gearbox, but it's a simple worm
gear reduction. The simplest setups have just a thermal switch to protect the motor. There's an option for load sensing, which measures
current to switch the motor off when it hits a certain amp setting to prevent overloading. The larger winches are two speed, that reverse the motor to get better
gear reduction, hence the need for the disconnect.
Maintenance is the same as the manual winches. Overall, I love having them. I essentially run my
boat solo since my crew, even though sailing with me for years, have yet to learn to even drive the boat straight while under
power. Having the winches makes my life much easier.
Edit: Watch the tail! It's very easy to forget to pay attention and not watch as the tailing gets sucked in causing an override, one that is really tight. I almost had to cut my
jib sheet when a crew
member wasn't paying attention. We were close hauled and in a narrow inlet, luckily going against the
current so I had time to clear the jam.