Originally Posted by brendanwalls
How much would an electric motor
I'm not good enough of a sailor to have a boat this size without an engine in the Chesapeake with its narrow channels and ubiquitous shoals.
To go electric
, you need a motor
, controller, and batteries
, in addition to a lot of very big cabling and some sort of user interface. DIY
you could do it for about $3000 or a bit more. A turnkey setup would cost probably about $8k not including batteries
. Keep in mind that there are some serious range and speed tradeoffs. I am talking about a 48v system using a 10kw motor
, sort of marginal for a 40'er, and a 10kw/hour bank of golf cart batteries. This is a setup that would be more commonly found on something under 35'. Ideally you would want the sort of motor and controller found in electric
cars. I would go at least 96 volts for a boat that size. A 21kw/hour bank would give you a decent range with a single
series bank. Most e-boaters with boats in that size range go with Lithium
either LiIon or LiFePO4
. I don't like them which is why I mention golf cart batteries, GC2 flooded cell. If you will just be day sailing
, electric is very nice indeed, especially if you do not need any serious range under power. For cruising the advantages fade a lot and those of diesel start to look a lot better.
Honestly I think, partly because of your unfamiliarity with EP and partly just out of general practicability, that you are better off with diesel, and I would give a hard look at a new Beta marinized Kubota. These have a wide user base so plenty of peer support. Factory support isn't bad. The company will ship the engine to a yard or to you, whichever. There is no requirement that an authorized mechanic
do the install. What they said... budget around $20k. It does help a little that the old engine is gone. Take this opportunity to detail clean the engine compartment and bilges. Check your fuel tanks
if they are metal. It sucks with boats of a certain age to find out too late that an aluminum
tank has been sitting on a galvanized screw head
for the last 40 years the hard way. Old hoses? Including stuffing box hose? Replace. Replace. Replace.
One more nice thing about the Beta. All the service points are easily accessible. Oil change
and other routine maintenance
is nice and easy. And you pay farmer prices for most parts
instead of yacht prices.
Some of the Beta engines are set up specifically to be direct drop in replacement for the Atomic 4. Just sayin.
Me, I don't want gasoline on a boat. But if you are okay with it and familiar with the safety
precautions, a new block A4 is pretty economical to install, just not quite as economical to run as a diesel.
I would recommend against relying on an outboard for primary mechanical propulsion
, though a 9.9 could maybe make for decent backup power. The problems are many. First it has to be mounted low enough to have the foot well down in the water, and angled for proper trim. Second, you have to be able to steer it. Okay yeah, you can use your rudder
and just lock down the outboard at dead center, but being able to steer the outboard really improves your dockside maneuverability. Very likely you would need a cable steering
system or a hydraulic system connected to your wheel
. The outboard tiller will be very awkward to reach if not impossible. You will need a strong backing plate and shoring for the mount, to resist the twisting force of the outboard. Outboards are useless when swamped by seawater. You will have gasoline onboard. On a 25' boat it is more realistic. On your 40, it doesn't sound so good to me. The new 4 stroke
outboards are very reliable but not as reliable as a well maintained diesel.