I could not agree with you more Mike. It depends on the boat, the way the customer uses it, how much they can afford and what power outputs they are comfortable with. Personally my 2.5kW nominal direct drive with voltage and torque constants to suit and 12 x 14, 3 blade 50% BAR works spot on per my predictions drawing 22.7 Volts with 104 Amps at the controller after accelerating to top speed (5 knots/around 85% hull in calm etc conditions) with bollard pull tests (not continuous) drawing 140 Amps ahead and 160 Astern at those voltages.This is in an 8,000 lb loaded sailing auxiliary powered displacement 26ft boat. My limitations were internal volume and my choice to re-power for the same weight and money or less than a replacement 10hp diesel.
So there is no right or wrong, just personal choices with guidelines. As you know I'm not commercial but can see that yourself, Sally and James in your respective companies have learned the hard way, so I am a little concerned that those that have not actually done their own install and learned as you have, give advice that is not hard won but is advice (often in isolation of other system components) that often does not tell a complete story and may mislead others.
The moral? Talk to the companies that know and don't expect all advice for free unless you want to possibly save money by buying a proven system from them from the outset. It is fun to do your own, but be prepared to make mistakes. I have been lucky, in part because I spent a lot of time doing sums and tests first and my system is not for all as it requires you sail in the first place and have an auxiliary electric, rather than a prime mover as it were.
John
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