My reason for staying 48 volts has nothing to do with safety, The problem with battery pack voltages above 48 volts is the near total lack of pure sign wave inverter, chargers and DC/DC converters. The money you save going to a high voltage motor is immediately lost in specialized high voltage inverters and chargers with greatly reduced feature sets.
Hi all
I have been reading for 5 years but seldem post. This site and some regulators seems to be stuck on 48v this voltage is ok for small boats, but we cannot advance without accepting the facts. I am an electricain and work daily with 120 v to 600 v and I make these systems safe for the public. I use breakers and mechicnal protection. This is not rocket science. The currents at low voltage are hard to manage, they create heat everywhere . the heat losses are to the square of the current.
I read all the time of users having heat issues with controllers and building noisey and inefficent gear reductions. I have a soloman 4.5 kw with an off the shelf AMC controller ,cool, to the touch all day long even in summer. My sweet spot is 4 A (600W) at 3.5kts in chop. Direct drive means only 1 moving part. low currents make for happy batteries. Green is full keel sloop at 5 ton.
My regret is the propeller I was 16X7 27 hp diesel, I went to 16X16 3 blade I wish for 4 blades or 16X20+ . The aggersive prop acts as a sea anchor so I spin at low speed (150W) while sailing ,like a dynamic neutral, and for a 100 watts more I can point a few degrees higher. I use a 3KW russco charger and Honda 2000i (1600w@ sea level,1400w up here on the lake) to reach amost hull speed, a 3000 would do it but they are too big.
With recycled electric vechicles available in comming years we will go to 300 votls . Dont be afraid ,be safe..
PS good luck to the Soloman team in Florida wish I was there.
Kevin Shepherd
E/SV Green
B.C. Canada
www.green-power.info
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