Hi, John
Be careful of doing so. You may end up being fried instantly ! You'll get toasted.
Ask a VERY good marine engineer electrician to do the switch installation job for you, buddy.
The connections must be sea water safe.
About the props, consult a "prop pro" too, otherwise you'll end up with something that you can spend years of changing, always not efficient.
Unless you have your big own 3D printer to make different prop blades again and again - save the time and let the pro's calculate it for you.
2x 18 KW is a lot for a cat.
But, realize :
How much do you actually need these engines ?
It's a sailboat ! That is your main engine, right ?
Learn to sail your vessel well, then you won't need those two 18 KW engines, right ?
Something smaller could do it.
Thanks Dan, for your last comment. Very useful (like always from you).
Carsten
On Saturday, 29 January 2022, 14:26:19 CET, john winterrowd via groups.io <sailorboy55577=yahoo.com@groups.io> wrote:
Greetings my fellow Electrosailors, the day has come after nearly a year of waiting for chips, motors, pumps, fans and now the final details need to be identified, she is getting repowered with Thunderstruck 18 KW kits.![]()
Facts and figures for SV/Retreat Time Catamaran
LOA 44 '
Water line 40'
Beam 20
Draft 3.5
Propeller 19 " Diameter 3 blade
Pitch 19 degree
Displacement 26,000 lbs.
Battery bank per hull consists of 12 group 31 AGM Duracell 100AH
Before I commit to keeping the 144-volt banks, I am asking the group to consider a few thoughts,
Sacrificing a few amps by dividing each battery bank in half operating at 72 volts, this way I may be able to parallel them together for higher total amp hours? Or have two separate banks for redundancy charging would be done on 110 volts instead of 220 volts.
Prop speed remains unknown to achieve at best half of hull speed, this is where I could use your help, without the variables of current and wind, I'm looking for a laboratory answer, this is to determine what gear reductions would best suit this vessels propulsion and efficiency. ![]()
https://vicprop.com/displacement_size_new.php
Any help or advice will greatly be appreciated as Thunderstruck is planning to program and tune and ship next week.
Thanks John
Facts and figures for SV/Retreat Time Catamaran
LOA 44 '
Water line 40'
Beam 20
Draft 3.5
Propeller 19 " Diameter 3 blade
Pitch 19 degree
Displacement 26,000 lbs.
Battery bank per hull consists of 12 group 31 AGM Duracell 100AH
Before I commit to keeping the 144-volt banks, I am asking the group to consider a few thoughts,
Sacrificing a few amps by dividing each battery bank in half operating at 72 volts, this way I may be able to parallel them together for higher total amp hours? Or have two separate banks for redundancy charging would be done on 110 volts instead of 220 volts.
Prop speed remains unknown to achieve at best half of hull speed, this is where I could use your help, without the variables of current and wind, I'm looking for a laboratory answer, this is to determine what gear reductions would best suit this vessels propulsion and efficiency. 
https://vicprop.com/displacement_size_new.php
Any help or advice will greatly be appreciated as Thunderstruck is planning to program and tune and ship next week.
Thanks John
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