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Battery Issues

posted Feb 20, 2021, 1:47 PM by Posts Editor   [ updated Feb 20, 2021, 1:50 PM ]

Meeting to discuss Nancy battery issues 18/2/21

Notes: Richard Forster

Present: Tom Stevens, Brian Marriott, Paul Frost, Brian Pain


  • Background

    • At the Open Day Nancy suddenly and unexpectedly lost power after less than an hour’s operation. After half an hour recharge she was able to go out, but after another half hour lost power again. After recharging overnight she would appear to be back to ‘normal’. This unexpected loss of power also happened a year ago on the way back from Kermandie.

    • Charger is adapted to lithium ion.

    • Batteries sold to us by a reputable dealer. Are six years old.

  • The problem

    • When the battery is kept on continuous charge, it isn’t charged when it said it is.

    • Battery runs out well before it is expected to.

    • This problem has occurred on multiple occasions.

    • There is no sure way of knowing how much charge is in the batteries unless they are fully charged or discharged. The voltage doesn’t tell you. Not knowing is a big issue.

    • Can batteries be bench tested?

    • If batteries are taken through a deep discharge then brought up they ‘come up’, shown by practical application.

    • Controller works at individual cell level.

    • Is the problem with the controller?

      • Brian has been checking this against measuring individual cells.

      • It is difficult to test with a different controller.

      • Check for a reset on the charger (Brian M)

      • Tom to send a link to Controller Discussion Groups to Brian M (Tom S)

    • Charger.

      • What sort?

      • Charger, controller and batteries bought as a unit.

      • It is in switch mode, but not absolutely certain.

    • Get more information. 

      • Talk to Battery World (Brian P). 

      • Talk to contacts and distributor, Rod Dilkes (Brian M).

      • Is the battery prematurely aged? Craig Salmon at French car care Kingston is a go to person for electric car owners. 0407126164.

      • Off grid installers may have information.

    • Batteries are protected from overuse by controller.

    • Stop gap measures.

      • Need to keep batteries off full charge. Only charge up when going out. In future:

        • Skipper does NOT normally put boat on charge (don’t plug in). If battery very low put it on a couple of hours timer charge (Brian M to arrange timer).

        • Boat MUST be booked out at least 24 hours before.

        • Plugged in the night before.

        • Need to a roster of ‘chargers’ who are informed when the boat is going out so that it can be charged. This needs to be incorporated into scheduling system (Richard).

        • Generators.

          • Can make modifications so that we are able to charge off a small motor, which has been a problem in the past (Brian).

          • Speak to Rod Dilkes (Brian).

        • Check the anchor (Brian P).

        • Need a safety boat capable of towing Nancy on standby (with driver). Rowan is ok, Tom is backup.

        • April 10th-11th Maritime trail Endra’s Nord is available as safety boat.

        • Share the Nancy calendar with critical people (Richard).

        • Need to schedule a few test runs (tow Rowan).

          • Next Tuesday (11am) Brian, Brian, Tom, Paul.

          • Trip to the slip – organise. (Richard). 



 Pic Happier days - Christmas 2015