Captain Canuck, I just want to reiterate that I am on your side -- I am also doing an electric conversion and I am just urging a holistic approach to engineering the boat as a system, and understanding the effects of uncontrollable, unexpected events on that system. And, I keep posting, um, lets say "strong suggestion" posts because I'm not just trying to help you, I'm trying to help everyone reading this thread too. Ultimately, what you do with your vessel is your business, I just want you to be successful. With that said...
My FCC issued call sign is WK7R, I am an extra class ham radio operator. Out in Arizona (as in many other places...) we do things like put repeaters/antennas next to commercial equipment that is mounted to 100'+ towers on the top of 7000' mountain peaks that get struck by lightning quite often -- as in multiple times every time a storm blows by. A large part of the body of knowledge in our hobby at this level has to do with effectively managing the 30,000+ amps of RF energy (Lightning current amplitude rises and falls so fast, the energy is effectively at radio frequencies and behaves as such, so we refer to lightning as RF energy) and protecting sensitive equipment (and dwellings, and people) from damage in this environment.
I guess I'm saying in no uncertain terms that I am better equipped to make a guess about what happens when lightning strikes your boat than you are, no offense intended. Please do look into the subject. It's actually one of the fascinating ones, that's a lot of fun to learn about. Things like how electricity at RF only conducts on the surface of conductors (That's why Faraday cages work). The sea is a conductor too, and when your boat is struck by lightning, often it travels down the outside of your mast, until the high impedance, low surface area ground cable turns a little too sharply toward a thru hull and the lightning finds a shorter, lower impedance path to the surface of the sea by blowing a hole through the side of your hull causing a pinprick leak at the water line, that may wind up sinking your boat.
The fact that lightning at 30 million volts that just arced through say 3000 feet of free air are going to LAUGH at the 1/4" arc gap in your fuse as it turns into a conductive cloud of plasma.
The fact that lightning is at such immense current that it creates an incredible magnetic field as it flows through conductors (including the air..) and actually induces
(as in magnetic induction) current in nearby parallel conductors (including signposts, masts, shrouds and humans who happen to be standing near by,) turning them into the secondary winding in a transformer such that even though the conductor may not be directly involved in the strike path, damaging currents flow (including enough to kill people, erase RAM, corrupt flash memory, fry transistors and FETs that fail shorted...)
Look into boat lightning strikes/near strikes. It's really scary the crazy things that can happen. And while even if we know how to manage lightning energy on towers and radio shacks on the tops of mountains, the same techniques are almost impossible to effectively employ on a fiberglass hulled boat like yours and mine. The insulation of the glass really works against us in the attempt to make the whole boat, as an electrical entity, rise and fall together with the voltage potential of the surface of the sea. It's just not realistic to effectively do that. Steel and aluminum boats are in a much better position in that regard. I guess the point is You Should Expect Every Electrical Device On Your Boat To Fail In The Worst Possible Way It Can.
While we will still build cool boats out of glass, or retrofit them with all manner of propulsion and sail them in spite of the forces of nature, we might as well make them somewhat failsafe so that even if everything shorts, every electronic device subject to the invisible electrical, magnetic, and electromagnetic forces of nature is destroyed... the consequences will still be manageable if, heaven forbid, we are on that boat when the worst happens.
And a for the record.. https://www.boatus.com/magazine/2017...ng-strikes.asp
the national average is 1 in 1000 sailboats are struck per year. And 3.3 per 1000 in Florida..
That's the stuff that keeps me awake at night... until it's actually storming. Then there's really nothing left to do after making fast to your mooring than to raise your drink, toast to life, and pray to God that you've done enough to prepare.
Personally, I don't want to be weighed in the balance and found wanting.
P.S. Dude I am totally sorry for all the big long preachy posts, I don't mean to be so damn serious.
There's just a lot of really interesting things out there that I've spent a long time trying to learn..figure I'd try to save you the trouble of a lot of the research.