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Recent content by grmiller

  1. E28+: Quick visual summary of first-year projects

    E28-1 E28+: Quick visual summary of first-year projects

    The image below summarizes the main projects completed on our 1981 E28+ during our first year-and-a-half of boat ownership (any boat ownership, not just this one). The various posts on this site were instrumental in providing guidance and encouragement to more boldly go where it might not have...
  2. Quick visual summary of projects completed to date

    Quick visual summary of projects completed to date

    The image below summarizes the main projects completed on our 1981 E28+ during our first year-and-a-half of boat ownership (any boat ownership, not just this one). The various posts on this site were instrumental in providing guidance and encouragement to more boldly go where it might not have...
    • grmiller
    • Blog
    • Blog entries: 1
  3. G

    28+ engine replacement

    A Diesel engine is not as efficient at harvesting that energy as an electric motor is at getting useful energy out of a battery, especially if one is looking at a range of operating conditions (e.g., slowing down in an ICE boat is not as useful in extending range because you move out of the...
  4. G

    28+ engine replacement

    I can’t help but believe you must be right, and you all have much more experience than I. However, boats also shouldn’t leak, but they do, and if you google ”boat diesel smell” (which of course I did early on), it’s clearly not an uncommon phenomenon. I think the pernicious issue is that once...
  5. G

    28+ engine replacement

    We do have regeneration, but with two props and motors and. 47-ft boat’s hull speed, you can do some serious regeneration (like a wind turbine the power available goes like the cube of the velocity). At the same time, the percentage of power harvested for regeneration relative to that used by...
  6. G

    28+ engine replacement

  7. G

    28+ engine replacement

    Salonica has just started selling a 47’ foot boat with dual electric motors and a single battery bank. What’s interesting is that at that scale they can get adequate regeneration while sailing to allow one to be essentially untethered from shore power (i.e., several hours sailing in modest winds...
  8. G

    28+ engine replacement

    Theses are the batteries we are using (except the house battery is 12V): https://dragonflyenergy.com/product/50-ah-24v-lifepo4-deep-cycle-battery/ The web site has whatever info we were provided. Note these are LiFePo, different from what might be in a car, in principle better suited for...
  9. G

    28+ engine replacement

    Hi Mark: Our system is DC, and yes, it is a 7KW motor. We have a 1:1 pitch on the 12-inch prop, and we actually haven't tried for top speed yet. Our theoretical hull speed is a bit over 6 knots, and I assume we could hit that in flat water. We sail out of the Edmonds, WA marina, and that...
  10. G

    28+ engine replacement

    I was writing from memory, so I went back and checked the invoices. I had an extra $10K floating around in my head--the total cost was about $40K, with 137 hours of labor. Still expensive, but a custom job like this seemed to be kind of like a kitchen remodel: you don't really know what all...
  11. G

    28+ engine replacement

    OK, I’ve felt guilty for all the help I’ve garnered from this site but without contributing back anything. I have an embarrassing backlog of things I could/should have been posting, but as the owner of an E-28+ who did a diesel-to-electric conversion last year, this is a no-brained for me to...
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