Join Date: Oct 2014
Location: Deale, MD
Thanked 2 Times in 2 Posts
Rep Power: 5
Re: Electric Conversion log for Kahleesea
USB serial cable was the problem. The BMS is now working perfectly.
The battery box is assembled and in the boat, but not yet nailed down.
The new helm plate is installed with one raymarine unit removed and the key and multimeter installed. The multimeter shows voltage, amperage, KWH used, KWH remaining, and a host of other useful info. Added bonus - it runs off of the 48V pack.
I've had to abandon the converter idea for now and go back to my AGM batteries for the house bank. The BMS will be running off of that. I'll have to have two chargers, one for each battery bank, but that's OK for now.
Everything is fully connected and I've started testing. Which leads us to....
*MOTOR FAILURE* <sad trombone sound>
Once I had everything set up, I fired up the system and gently pushed the throttle forward. I went all the way up to 36A and the motor wouldn't turn. I assumed I'd messed something up, made something too tight, or whatever, so I completely decoupled everything. With the motor completely free, it still took 6A to start it turning. The motor was also very loud. I got on the horn and called Thunderstruck, talked to their motor engineer and asked him how many amps it should take to start the motor turning. They set up their system on their end (same as mine) and tested it. 1/2A to turn both the motor and the gear reducer.
They are sending me a new encoder. Its a postage-stamp sized circuit board that goes on the back of the motor and relays information on motor position to the controller so the motor can turn smoothly. This is most likely the issue. Unfortunately, they sent it ground, so it won't be here until next Tuesday. Ugh.
Nothing like being stopped 1 yard from the finish line.
My wife and I are finalizing our new decal for the boat. That should be here by the end of the week.
After the new encoder arrives, I can finish my tests, screw everything down, and get Khaleesea relaunched. Then the sea trials can begin. Finally.