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Electric repower of Lotus Flower a 1976 Ericson 27

Well, three and half years into life with electric propulsion (EP) on Lotus Flower a 1976 E27 I think it's time to log some thoughts on the web. I will start with a timeline of the process.

  1. EP making the change to lithium

    by , 01-18-2017 at 04:47 PM (Electric repower of Lotus Flower a 1976 Ericson 27)
    After 8 years of use with AGM batteries for propulsion I have removed and replaced them with lithium (LiFePO4). The AGM's were still working fine for short term motoring needs but the range capacity had definitely dropped in the past few years.

    Lotus Flower had two 48 volt AGM battery banks. One bank of group 27's and one bank of group 31's. The lead acid batteries worked well and were relitivaly simple to install.

    The new lithium battery setup also has two 48 volt ...

    Updated 01-19-2017 at 08:42 AM by Mark F

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  2. Electric repower of Lotus Flower a 1976 Ericson 27 - New Prop

    by , 10-10-2011 at 03:59 PM (Electric repower of Lotus Flower a 1976 Ericson 27)
    The existing 11x10 fixed two blade prop gave me a top speed of 4.5 knots and a 20 amp speed of 3 knots. Knowing a bigger prop would be more efficient and reading that a three blade prop would be better for regeneration I found a 12x10 fixed three blade locally and had it installed. This was a nice improvement. The top speed increased to 5.7 knots and at a 20 amp draw I was now getting 4 knots of boat speed. I have a 13x12 fixed three blade prop that I plan to experiment with in the future.
    ...

    Updated 10-13-2011 at 07:29 AM by Mark F

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  3. Electric repower of Lotus Flower a 1976 Ericson 27 -Still Phase Two - battery monitor

    by , 10-10-2011 at 03:35 PM (Electric repower of Lotus Flower a 1976 Ericson 27)
    Sometime around the installation of the second battery bank I installed a PakTrakr battery monitor. The PakTrakr is a fairly inexpensive monitor, not particularly robust looking and not marinized but as of this posting has been basically trouble free and a great asset. To see the functions the monitor performs check out the web site; http://www.paktrakr.com/ While I pay attention to all of the information the unit reports the most useful data are the pack voltage, amp draw (motoring), amps in (charging) ...

    Updated 10-11-2011 at 02:17 PM by Mark F

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  4. Electric repower of Lotus Flower a 1976 Ericson 27 - Phase Two

    by , 10-05-2011 at 01:53 PM (Electric repower of Lotus Flower a 1976 Ericson 27)
    More Batteries;

    After initial operations with the existing prop and minimal battery capacity (four group 27 AGM’s) I added four group 31 AGM batteries as a separate 48 volt bank for longer range and redundancy. This brought the battery storage up to about 200 amp hours at 48 volts total. There are valid arguments against the two separate banks system I chose and having all eight 12 volt batteries connected in series/parallel as one bank.

    The main issue is the range ...

    Updated 10-11-2011 at 02:16 PM by Mark F

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  5. Ep

    by , 09-21-2011 at 11:45 AM (Electric repower of Lotus Flower a 1976 Ericson 27)
    Well, three and half years into life with electric propulsion (EP) on Lotus Flower a 1976 E27 I think it's time to log some thoughts on the web. I will start with a timeline of the process.

    Phase one;

    5/22/07 – Bought 1976 Ericson 27 “Lotus Flower”

    5/22/07 – 11/07 docked in Sausalito CA, sailed SF Bay with 6hp outboard

    11/07 - Sailed from Sausalito to Santa Cruz (6hp outboard)

    4/18/08 - $2000 Down payment for SolidNav Explorer ...

    Updated 10-29-2011 at 11:40 PM by Mark F

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