"Current Situation" DIY Efficient Solar/Electric Powered Newport 17 Project.

Discussion in 'Boat Design' started by ElectroDanO, Jan 1, 2021.

  1. missinginaction
    Joined: Aug 2007
    Posts: 940
    Likes: 160, Points: 43, Legacy Rep: 512
    Location: New York

    missinginaction Senior Member

    Nice to see some "out of the box" thinking. I'll be following along! One thing I haven't seen mentioned. Your old man (assuming he's your father) has a pretty wild beard there.
     
    ElectroDanO likes this.
  2. Heimfried
    Joined: Apr 2015
    Posts: 368
    Likes: 50, Points: 28, Legacy Rep: 37
    Location: Berlin, Germany

    Heimfried Senior Member

    Hi bajansailor,
    as I'm an old guy and learned late some English - which is not my my mothertounge - it is a bit laborious for me to write longer texts in English. But some pics will tell about my build.
    Houseboat Katamaran ECO62 http://forum.woodenboat.com/showthread.php?232326-Houseboat-Katamaran-ECO62
    Much more and very deteiled stuff can be found here, it's in German, but contains also a lot of pics.
    boote-forum.de - Das Forum rund um Boote https://www.boote-forum.de/showthread.php?t=260166

    I very appreciate your friendly and knowledgeable posts in this forum!

    Gruß, Günter
     
    ElectroDanO and bajansailor like this.
  3. ElectroDanO
    Joined: Jul 2019
    Posts: 24
    Likes: 13, Points: 3
    Location: Smyrna TN

    ElectroDanO Current Situation

    Who? This old hot rodder!?o_O
    [​IMG]

    Not my Pops, but one of my best buddies right there! That's me in the back BTW. He donated the Minn Kota 30 and always helps with crazy projects I come up with. While he doesn't completely understand my passion for this boat, he's way more supportive now after going for a sunset cruise. We'll keep working on him...:D
    [​IMG]
     
  4. ElectroDanO
    Joined: Jul 2019
    Posts: 24
    Likes: 13, Points: 3
    Location: Smyrna TN

    ElectroDanO Current Situation

    It's very cool to see interest in my little project. Motivates me even more. I thought I might get laughed out of the place at first!:D

    I quickly looked though your project thread and WOW! I'm impressed and in love! That will be a perfect candidate for solar/electric drive. I have a feeling your finished product will be worth all of your effort. What an accomplishment that will be!

    Originally I was just looking for a cheap, small, lightweight sailboat hull and never planned on having a cabin. Now that I've discovered "boat camping", it's opened up a whole new world of enjoyment(and ideas) for me. I think it would be awesome to travel and use the boat as an off grid camper. Your boat with solar would be perfect for that kind of adventure! :cool:
     
    missinginaction and Heimfried like this.
  5. ElectroDanO
    Joined: Jul 2019
    Posts: 24
    Likes: 13, Points: 3
    Location: Smyrna TN

    ElectroDanO Current Situation

    We've been ice/snowed in all week with no internet. Oh my!!!

    Perfect time to babysit these new batteries while doing a top balance and capacity test. I spent DAYS with that little project...:eek: I learned a lot and it was cool to see how this chemistry acts in real time. Completely different ball game than FLA! Mostly in a good way. I stress out over this stuff...:rolleyes: Doing the capacity tests, both "batteries" came in at exactly 100ah/1.28kwh each. These were supposed to be 105ah cells so I'm not sure what to think. Is this normal? Did I not do something right? Are they really 100ah cells? I'm thrilled with the results though. They absolutely cranked out an honest 100ah with no drama. More than enough capacity for this project!

    [​IMG]
     
    portacruise and philSweet like this.
  6. clmanges
    Joined: Jul 2008
    Posts: 402
    Likes: 53, Points: 28, Legacy Rep: 32
    Location: Ohio

    clmanges Senior Member

    I wouldn't worry about a five percent discrepancy from advertised capacity.
     
    ElectroDanO likes this.
  7. portacruise
    Joined: Jun 2009
    Posts: 1,145
    Likes: 44, Points: 48, Legacy Rep: 218
    Location: USA

    portacruise Senior Member

    Capacity may be lower at high current draw and low temperatures, even for the various advanced lithium chemistries. Peukert equation?
     
    ElectroDanO and BlueBell like this.
  8. BlueBell
    Joined: May 2017
    Posts: 1,458
    Likes: 331, Points: 83
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    EDO,

    How were the temperatures throughout the tests?
     
    ElectroDanO likes this.
  9. ElectroDanO
    Joined: Jul 2019
    Posts: 24
    Likes: 13, Points: 3
    Location: Smyrna TN

    ElectroDanO Current Situation

    Yeah, I'm not one bit disappointed at all. For being low budget stuff, I was happy to see that all the cells are healthy, BMSs are doing their jobs and nothing got hot. I breathed a sigh of relief when all of this was over...:D I pulled just under 20 amps for the whole test and nothing got over mid-80s temp wise. This was done inside my house that was 72 degrees. Pretty cool to watch them push 250w for over five hours while holding the voltage steady at 13.0-12.9 for most of that. Laughable to think how the old lead acids would have held up...
    [​IMG]
     
    portacruise and BlueBell like this.
  10. portacruise
    Joined: Jun 2009
    Posts: 1,145
    Likes: 44, Points: 48, Legacy Rep: 218
    Location: USA

    portacruise Senior Member

    You might need a fuse, a circuit breaker, or some kind of high current alarm to warn about weeds tangling in the prop, short of causing a stall. The RC props that I have used are much more likely to tangle than the weed free standard prop.

    Here is a Ragone plot for diminished capacity at High currents with some lithium chemistries:

    BU-503: How to Calculate Battery Runtime – Battery University https://batteryuniversity.com/learn/article/bu_503_how_to_calculate_battery_runtime

    May not be much of a factor unless you are running a fouled prop for prolonged time, which would also make the motor run hot.
     
  11. ElectroDanO
    Joined: Jul 2019
    Posts: 24
    Likes: 13, Points: 3
    Location: Smyrna TN

    ElectroDanO Current Situation

    Thanks portacruise. Interesting stuff. A fuse is something I haven't given much thought, but probably should. These BMSs have a built in over current shutoff if they hit over 60a. Not sure if that's good enough or not. Weeds are almost never an issue for me but I did go exploring last year and found out what you guys have been talking about with these RC props in weeds. Yikes! Thought I was going to have to get out and swim with the snakes. Lesson learned...:eek:

    Probably not a bad idea to throw a factory prop in my prop box that I keep in the boat...;)
     
    Last edited: Feb 22, 2021 at 4:55 PM
  12. ElectroDanO
    Joined: Jul 2019
    Posts: 24
    Likes: 13, Points: 3
    Location: Smyrna TN

    ElectroDanO Current Situation

    Well, this project escalated quickly today!

    I started with my usual CAD(cardboard-aided design), but with some(all of the) help from a good friend, it's turned into something much better! NACA 0025, 3D printed fairing is in the works! Trial runs are starting right meow. How cool is this!?
    [​IMG]
    [​IMG]
     
    portacruise and kerosene like this.

  13. portacruise
    Joined: Jun 2009
    Posts: 1,145
    Likes: 44, Points: 48, Legacy Rep: 218
    Location: USA

    portacruise Senior Member

    If you cannot reach the prop to manually detangle weeds , sometimes lifting and spinning the prop out of water for a few seconds in reverse and forward will flick them away.

    My guess is the 60 BMS amp limit might be good for a complete stall, if it is shut down fast enough. Monitoring for current increases while underway will indicate significant accumulations on the prop even when a change of speed is barely noticeable. But constantly glancing at the meter might detract from enjoying the Boating experience.

    Another consideration might be to find what limit of wind/ water current speeds can be challenged. Myself likes to find a launch site that is into the wind if at all possible, so I can know the limits and coast back with the help of the Wind at any point should I fail to make progress.

    But you may already be aware of these things, hope this helps.
     
    Last edited: Feb 24, 2021 at 3:44 AM
    ElectroDanO likes this.
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.