On Aug 25, 2020, at 12:44, Bob Caulk via groups.io <bob_caulk@...> wrote:

?

That's a really nice looking little launch.

The 5kw kit is definitely more than you need, but it doesn't really hurt much to have extra power that you don't use. I do however think that 3kw would be more than enough for you to achieve hull speed. The key will be to get the proper propeller and shaft speed reduction for efficient use of the battery power.?

On Tuesday, August 25, 2020, 12:34:01 PM PDT, Dean is retired <dwilson@...> wrote:

Hi Carsten-

My calculated speed is 5.1-5.5 mph. My boat, fully equipped, without passengers, will be under 700 pounds. My thinking is that pushing a light boat with a little more power, if desired, might give it another knot or two. I would normally try to run at 1/2 to 2/3 power to get my displacement speed.?

I don't believe the difference in price between 3kw and 5kw would be too significant.

If it IS overkill, where do I start, to put together all the components? I AM a rookie here. That's what I liked about the Thunderstruck package.....it's all there, save for the batteries and charging system.

Thanks for responding,
Dean?

On Aug 25, 2020, at 10:08, L Schmitz via groups.io <terminalift@...> wrote:

?

You will like the thunderstruck kit.? I have the 10 kw. They are very helpful with directions and advice.? I first installed 4 agm 48 v 220 ah? ?then upgraded to diy lifepo4? 48v 360ah? Pushes my 40 ft sailboat nicely.? ?plenty of power and range.? Charging is easy.? The installation is very straight forward.? ?best regards Larry Schmitz

?Terminalift LLC

9444 Mission Park Place

Santee, CA 92071

Ph: (619) 562-0355

F: (619) 562-2060

On Tuesday, August 25, 2020, 09:43:31 AM PDT, Carsten via groups.io <carstensemail@...> wrote:

Hi, Dean

5 KiloWatt is overkill, unless the hull is designed for planing :-)

What is the calculated hull speed of your design ?

On Tuesday, 25 August 2020, 20:55:03 GMT+8, Dean is retired <dwilson@...> wrote:

Hi Everybody- I'm new to this site and to electric boating, but no stranger to building things. My current project is a 14' launch, patterned after an early Rushton 32' steam launch, scaled down. I was thinking that the Thunderstruck 5KV sailboat conversion package might be nice....complete kit....plug and play, for someone who is not well versed in electric power. Is this serious overkill for my little boat? Where do I start? What other options should I be exploring??

?

?Ryan, I think your list is reasonable. After I found myself adrift with no electrical power at all, not the motor, nor the lights or radio, as night fell, I got a full set of spare fuses. It didn't prompt me to put a 12v battery downstream of my DC/DC converter, which would have kept the lights and radio working when the propulsion system failed. I do have some spare electrical fittings on board, but haven't evaluated it as a backup kit. My boat sails well in a range of wind conditions and I sail in a limited area so that amount of backup suffices for my level of risk tolerance.

Myles' list looks much more comprehensive, like one that conservative offshore sailors would have, the type of people who could rebuild their diesel, and replace standing rigging while offshore or in some remote anchorage. I suspect many people won't want to spend that much, but they should strongly consider if they are going places where they have no access to spares and repairs, but I think many of us boat in areas with access to those things, so we just need to make it to safe harbor.??

On Aug 24, 2020, at 13:57, damonalane <dlane@...> wrote:

?Ryan, I think your list is reasonable. After I found myself adrift with no electrical power at all, not the motor, nor the lights or radio, as night fell, I got a full set of spare fuses. It didn't prompt me to put a 12v battery downstream of my DC/DC converter, which would have kept the lights and radio working when the propulsion system failed. I do have some spare electrical fittings on board, but haven't evaluated it as a backup kit. My boat sails well in a range of wind conditions and I sail in a limited area so that amount of backup suffices for my level of risk tolerance.

Myles' list looks much more comprehensive, like one that conservative offshore sailors would have, the type of people who could rebuild their diesel, and replace standing rigging while offshore or in some remote anchorage. I suspect many people won't want to spend that much, but they should strongly consider if they are going places where they have no access to spares and repairs, but I think many of us boat in areas with access to those things, so we just need to make it to safe harbor.??

On Aug 24, 2020, at 13:57, damonalane <dlane@...> wrote:

?Ryan, I think your list is reasonable. After I found myself adrift with no electrical power at all, not the motor, nor the lights or radio, as night fell, I got a full set of spare fuses. It didn't prompt me to put a 12v battery downstream of my DC/DC converter, which would have kept the lights and radio working when the propulsion system failed. I do have some spare electrical fittings on board, but haven't evaluated it as a backup kit. My boat sails well in a range of wind conditions and I sail in a limited area so that amount of backup suffices for my level of risk tolerance.

Myles' list looks much more comprehensive, like one that conservative offshore sailors would have, the type of people who could rebuild their diesel, and replace standing rigging while offshore or in some remote anchorage. I suspect many people won't want to spend that much, but they should strongly consider if they are going places where they have no access to spares and repairs, but I think many of us boat in areas with access to those things, so we just need to make it to safe harbor.??

On Aug 23, 2020, at 21:09, Ryan Sweet via groups.io <ryan@...> wrote:

?

?Does one expect the sevcon gen 4 to clear fault codes without intervention if the fault condition is ameliorated, or is intervention required?

With my old Toyota Highlander hybrid it always required intervention if a fault code was triggered. You had to send a reset command via ODBD-2. ??

I am assuming the sevcon is similar. ?I have put everything back the way it was when it was working, and voltage at the throttle (potentiometer - I have the Curtis throttle from the thunderstruck kit) - checks out normal. ?The throttle is in the off position. I don’t know how I would check the output current, without the throttle telling the motor to go, but I’m wanting to believe the fault had something to do with the charger being applied to the circuit as that was what changed. ?

If the expectation is that the sevcon gen4 ?will return to normal once the fault condition is no longer true, then my working assumption would have to shift to either the throttle or the contactor being damaged in some way.?

It was a bummer because I methodically tracked down and fixed all the vibration and alignment issues until it was humming as silently as could be expected, and was just setting up to wait for the tide to put it back in the water.?I suppose it’s good to be learning about these things before I am somewhere far from home.?

This is the section of the manual with fault code 6 (formatting is wonky but it’s (fault|causes|procedure)...
—
6 Throttle pressed at
power up

DI Throttle demand is greater than
20% at power up.

Reduce demand

6 Analog input wire-off VS Analog input voltage is outside

allowable range.

Check analog input
wiring

Monitoring

Doc. #?177/52701
Rev. 3

7-7

LED
flashes
Fault Level Set conditions Operator action
6 Analog output fault
(over/under current,
failsafe, short circuit
driver)

VS Analog output fault caused by over
current (>4A), under current if
actual current < 50% target
(current mode only), failsafe circuit
fault, short circuit driver
MOSFET.

Check analog output
wiring.