Re: [electricboats] First run

Hi Mitch, 

Mine is 48v. After adjustment of the prop angle ever so slightly the system is much quieter and now using a victron 712 meter we still have about the same numbers. Above 5kts it starts to ramp up the draw very quickly (I mean its still a logarithmic curve but that's the dense area under the curve). 

Now I'm wiring up new powerwall style lifepo4 batteries and moving the AGM to be the house bank. 

On Nov 1, 2020, at 10:27, Mich Pop <michpop@gmail.com> wrote:

Hi Ryan

Those are very good numbers.

We have a similar boat and a much higher consumption.

We are running a 48 V system.

Do you use a higher voltage?

Cheers

Mich

On 27 Aug 2020, at 2:52 am, Ryan Sweet <ryan@ryansweet.org> wrote:

I am working on a larger write up but thought I would share some results from my first run.

Main concern: it was too loud! I think the cutlass bearing was too worn when I started The project and there was too much motion up and down. I think that the shower is aligned with the motor well, but dad it's at to much of an angle with respect to the Cutlass bearing. This is also putting pressure on the stuffing box.

So I need to adjust the angle.

But I was able to get some preliminary numbers

The boat is a 1979s 30 foot fiberglass hulled ketch (Rawson 30).  Hull speed is 6.9ish

Power consumption is almost logarithmic, as expected ~20a @ 3.2kn, ~55a @ 4.5kn, 115a@ 5.5kn

Don't yet know how much to trust that meter.   
What do you guys use to monitor battery capacity? I have a little meter that I ordered from Amazon but it recorded 100% wow at the end of the run and when I plugged in the charger, it recorded between 50 and 75% unfortunately the charger doesn't give me a better number than that.