Welcome Guest - Sign Up today
Welcome Guest - Sign Up today

Announcement

Collapse
No announcement yet.

9.9 charging voltage and Battery.

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • 9.9 charging voltage and Battery.

    I hope everybody had a good Christmas.
    I have a 1988/9 Evinrude 9.9 electric start recently fitted with a new rectifier, fitted to a 9ft. speedboat. When running fast it used to show about 14v - 15v on the voltmeter. It has now started showing about 16v. It has been suggested that there may be a bad cell in the 3 year old battery, although it starts the engine well enough. My questions are-
    1) If I continue to use it as is, will running with this high voltage damage the electrics in the engine?
    2) The battery is 24 amp hour, if I change it, would a smaller battery, say to about 12 amp hour to save weight, is that big enough for the motor?
    Many thanks for any advice.
    John.

  • #2
    16V is not uncommon with a fully charged battery. There are a jillion rigs running around out there with no problems, but some electronic accessories may not like it.

    Yes, your battery choice probably is causing most of the situation.

    Comment


    • #3
      While running you should be charging at over 14 volts but under 16 volts, charging over 16 volt; it means either your rectifier/ regulator is bad or you have a bad battery. Usually it is a bad battery.
      http://[ATTACH=CONFIG]temp_277589_1506228680552_413[/ATTACH]

      Boat Pro International
      Restorations, Appraisals & Detailing

      Comment


      • #4
        There was no voltage regulator offered as an option / or needed for that motor.----Just used a rectifier.

        Comment


        • #5
          and common ……. full wave rectifiers are dirt cheap ...on amazon $1.60 each

          handles 1000v 50 amps should be ok for a 9.9hp

          https://www.amazon.ca/10pcs-Single-B...wave+rectifier

          Comment


          • #6
            Thanks Guys. That puts my mind at rest regarding damaging the motor's electrics. No problem with the boat's electrics, GPS speedo 9v - 32v. Any comments regarding battery capacity, please?

            Happy New Year!

            John.

            Comment


            • #7
              use what the manuf. recommends or bigger

              Comment


              • #8
                16 volts is ok for that system. It is an unregulated system and uses the battery as the regulator. That is why you need to use batteries that can be refilled instead of maintenance free batteries . If you want to correct that get a regulator rectifier combo if on is available for it.
                Last edited by flyingscott; December 30th, 2018, 05:24 PM.

                Comment


                • #9
                  you can probably fit one in form a bike shop seach the web ….

                  Comment


                  • #10
                    Service manual minimum battery requirements are 350 cold cranking amps (cca), and 100 minute reserve.

                    Sounds offhand like you might need to top off your battery with distilled water, and give it a full shore charge — probably wouldn’t hurt to take it into a car parts store, and have it tested for capacity and load. With a fully charged battery, you should expect to see around 14 volts on your volt meter. (Rectifier for your motor, btw, is the four lead model — one red and three yellow.)

                    Comment


                    • #11
                      3 yellows 3 phase most likely………. in any event they can be purchased for 6$ each

                      good for 50 amps 3 yellows to the 3 pins and out comes +12 and negative :-)

                      https://www.amazon.ca/BQLZR-Aluminum...hase+rectifier

                      Comment


                      • #12
                        Originally posted by Crosbyman View Post
                        3 yellows 3 phase most likely………. in any event they can be purchased for 6$ each

                        good for 50 amps 3 yellows to the 3 pins and out comes +12 and negative :-)

                        https://www.amazon.ca/BQLZR-Aluminum...hase+rectifier
                        The 4 wire rectifier is indeed a 3 phase rectifier although the output from the stator coil is not strictly 3 phase

                        Comment


                        • #13
                          Many thanks, everybody. I can see where to go now, starting with checking and charging the existing battery.

                          Comment


                          • #14
                            Sign up today
                            Originally posted by driver0606 View Post
                            Many thanks, everybody. I can see where to go now, starting with checking and charging the existing battery.
                            Charge the battery with a good automatic charger ( A 4 amp one will be more than big enough for a 24Ah battery ) until the charger goes into float or maintenance mode.

                            Let it stand with no further charging or load for 12 hours then measure the volts with a digital voltmeter. If the battery is good it should read 12.7 ish to 12.8 ish

                            Allow the battery to stand with no further charging or load for several days, preferably several weeks. The volts will slowly fall but it should take several weeks to fall below 12 .5.

                            If all seems good based on the above as a final test get it load and capacity tested by a battery supplier or auto parts store.


                            If you want to save on space and weight you may be able to find a compact AGM stater battery. but I dont know what brands you will have in Canada ( Red Flash by DMS Technologies in the UK)

                            BUT if you run any other electrical equipment on your boat be sure that the battery has a large enough Ah capacity to ensure that you never run below 50% state of charge before recharging.

                            Comment

                            Working...
                            X