I replaced a 15hp yanmar 2qm15 with a 10kw 48V thunderstruck system so a bit smaller initial diesel than what you are comparing against. I did switch to a larger 3 blade prop to get more range and regen (capability).
There are lots of nice aspects of the electric motor:
1) limited maintenance, i.e. no transmission to worry about among many other things.
2) quiet
3) has a lot of torque at low rpms and can run at an arbitrarily slow speed, super nice for maneuvering to get in and out of a slip.
I would highly recommend going with LFP batteries. Do not get lured into the 'cheapness' of lead acid or agm batteries.
Detractors of electric will tell you... what if you are in a storm and you need to motor full throttle for 48 hours. Ok, you got me, make sure you have done all your 'standard maintenance'. I hope you know what storm sails are.
I carry a small 2200 honda generator and 5 gallons of fuel so if I need to harness the energy density of fossil fuels that is an option. You can do a lot with 2kw of power, maybe not hull speed but the boat moves pretty well. This goes a long way to alleviating range axiety.
The continuous power rating works out to about 13hp for a 10kw motor. That said -
Great read:
https://blog.greenyachtsales.com/blog/the-hp-of-an-engine-vs-the-kw-of-an-electric-motor?hs_amp=true
"electric motor of X kW is comparable to a gas or diesel engine with HP 2-3 times higher"
In summary, I would say the electric motor shines at low rpm and being ready in an instant. The ice shines in running for long periods of time at high rpm. If you don't use an oversized prop with the electric, you are missing out on all that easy low rpm torque.
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Rumble <rumble@bigpond.net.au>
Date: 6/23/22 6:53 AM (GMT-10:00)
To: electricboats@groups.io
Subject: [electricboats] 48V 10kW vs 20/30hp ICE
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