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Anything wrong with feeding AC Output of Inverter directly into Shore Power Input?-gctid397749

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    Anything wrong with feeding AC Output of Inverter directly into Shore Power Input?-gctid397749

    The inverter already exists inside the cabin, in the cabinet under the microwave. When we have shore power, the microwave is plugged into the existing AC receptacle. When we are without shore power, we plug the microwave directly into the AC outlet of the inverter.

    I recently purchased a TV for overnight slip use. Now I'm thinking what if we do want to use the TV when away from shore power. I don't want to run extension cords across the cabin.

    An immediate "lazy" approach I had (I really don't want to rip apart the boat, relocate the inverter, tap/splice into existing cabling, worry about isolators, relocating batteries, etc, etc.) And to address any questions that may come from this statement - the current installation of the inverter/dual batteries, etc was done professionally and properly - it has all the aforementioned proper requirements. I just don't want to redo all of it again to wire the inverter into the AC, since this will require relocating the inverter and everything else.

    Instead, what if I simply take a proper shore power cable and run it from the AC out of the inverter directly into the shore power connection?

    In my case, the shore power connection is inside the boat - exposure of any kind is not an issue - and I can easily feed a shore power cable from the inside of the boat to where the shore power connection exists today.

    The "advantage" I get here - I hope - is for the "simplicity" of running a single cable and 5 minutes of my time, I can now have AC power throughout the boat on all recepticles (just like I'm at the dock) by simply taking advantage of the existing AC breaker panel / shore power connections that are already on the boat.

    Is there something I'm not aware of that would make this a big "no- no"?

    And "no", I would NOT attempt to run the fridge on AC this way at all. Only the existing "receptacles" and "microwave" breakers from the AC Main panel would be turned on.

    #2
    Robert K wrote:
    • 1 wrote:
    • the current installation of the inverter/dual batteries, etc was done professionally and properly -
    • it has all the aforementioned proper requirements.
    • I just don't want to redo all of it again to wire the inverter into the AC, since this will require relocating the inverter and everything else.
    • Instead, what if I simply take a proper shore power cable and run it from the AC out of the inverter directly into the shore power connection?
    • In my case, the shore power connection is inside the boat - exposure of any kind is not an issue - and I can easily feed a shore power cable from the inside of the boat to where the shore power connection exists today.
    • The "advantage" I get here - I hope - is for the "simplicity" of running a single cable and 5 minutes of my time, I can now have AC power throughout the boat on all recepticles (just like I'm at the dock) by simply taking advantage of the existing AC breaker panel / shore power connections that are already on the boat.
    • Is there something I'm not aware of that would make this a big "no- no"?
    • And "no", I would NOT attempt to run the fridge on AC this way at all. Only the existing "receptacles" and "microwave" breakers from the AC Main panel would be turned on.



    You emphasized that this was done professionally. If a professional installation is important to you, here's a few suggestions.
    • 1 wrote:
    • No offense, but I'd beg to slightly differ here!

      Had a Shore Power (slash) Generator (slash) Inverter rotary switch been installed, you'd be able to select between "sources" and not have to mess with a power cord.



      Since your S/P circuits are capable of a greater Amp load than the inverter may supply, you can use a slide bar lock-out main breaker to prevent certain circuits from being powered by the Inverter.

      (where this reads "Generator" you could re-label it "Inverter")



      Or configure this to use the slide bar lock-out only.

      (btw, a variety of actual Marine Inverters are equipped with an Auto-Transfer switching device that prevents the need for your power cord approach)
    • As a stand-a-lone.... I'm sure that it does.
    • Understood.... but this would be a one-time-deal!
    • It would work! But again.... how important is it to have a professional installation?
    • Same as above.
    • You can achieve the same thing by turning the selector knob on a newly installed Rotary Switch and slide bar main breaker selection.

      Or by installing the slide bar main breaker ONLY..., and making a selection change there.
    • Not necessarily a no-no.... but certainly not a true marie set up.
    • Sounds all fine and dandy until someone accidentally forgets to turn these circuits off.




    If you were asking about plugging in a Honda EU generator via a power cord to your S/P inlet fitting......, then yes...... I'd say go for it.

    Bottom line...... your proposed idea will work, but this is likely not how many of us would do this.
    Rick E. Gresham, Oregon
    2850 Bounty Sedan Flybridge model
    Twin 280 HP 5.7's w/ Closed Cooling
    Volvo Penta DuoProp Drives
    Kohler 4 CZ Gen Set

    Comment


      #3
      Rick,

      Thank you for all the valuable feedback - no offense is ever taken

      I'm sure one day I will take on the task of redoing the inverter such that it is cabled like you suggest - but it's good to know that "in a pinch" I could safely get away with running a cord until such time that I can do what you provided.

      Thanks again!

      Comment


        #4
        Robert K wrote:
        The inverter already exists inside the cabin, in the cabinet under the microwave. When we have shore power, the microwave is plugged into the existing AC receptacle. When we are without shore power, we plug the microwave directly into the AC outlet of the inverter.

        I recently purchased a TV for overnight slip use. Now I'm thinking what if we do want to use the TV when away from shore power. I don't want to run extension cords across the cabin.

        An immediate "lazy" approach I had (I really don't want to rip apart the boat, relocate the inverter, tap/splice into existing cabling, worry about isolators, relocating batteries, etc, etc.) And to address any questions that may come from this statement - the current installation of the inverter/dual batteries, etc was done professionally and properly - it has all the aforementioned proper requirements. I just don't want to redo all of it again to wire the inverter into the AC, since this will require relocating the inverter and everything else.

        Instead, what if I simply take a proper shore power cable and run it from the AC out of the inverter directly into the shore power connection?

        In my case, the shore power connection is inside the boat - exposure of any kind is not an issue - and I can easily feed a shore power cable from the inside of the boat to where the shore power connection exists today.

        The "advantage" I get here - I hope - is for the "simplicity" of running a single cable and 5 minutes of my time, I can now have AC power throughout the boat on all recepticles (just like I'm at the dock) by simply taking advantage of the existing AC breaker panel / shore power connections that are already on the boat.

        Is there something I'm not aware of that would make this a big "no- no"?

        And "no", I would NOT attempt to run the fridge on AC this way at all. Only the existing "receptacles" and "microwave" breakers from the AC Main panel would be turned on.
        It is not a problem.

        It is done all the time.

        The inverter is self regulating and will trip if you draw too much power.

        Comment


          #5
          check737 wrote:
          It is not a problem.

          It is done all the time.

          The inverter is self regulating and will trip if you draw too much power.
          I did exactly this on my 2755. Do not turn the battery charger on you can't charge the batteries off the inverter. You want to also be careful what you are running off the inverter nothing RED, that's nothing with a heating element.Does the new TV have a puck power cord it might be 12 vdc.

          Ken
          300SD all options sold.

          Comment


            #6
            Do not turn the battery charger on you can't charge the batteries off the inverter.
            Good point, and all the more reason to set this up properly with either a Rotary Switch/Slide Bar L/O Main Breaker combination, or at minimum the Slide Bar L/O Main Breaker.

            I'm not quite sure if that part was understood earlier, but this would prevent unwanted circuits from being accidentally powered up during Inverter use.

            .
            Rick E. Gresham, Oregon
            2850 Bounty Sedan Flybridge model
            Twin 280 HP 5.7's w/ Closed Cooling
            Volvo Penta DuoProp Drives
            Kohler 4 CZ Gen Set

            Comment


              #7
              I don't want to offend anyone here, but when I read the comment, "it's done all the time" That really doesn't make it right!
              David
              1999 Bayliner 1750 Capri. 3l Mercruiser Alpha

              2014 Yamaha VX Cruiser

              Comment


                #8
                Davidlyne wrote:
                I don't want to offend anyone here, but when I read the comment, "it's done all the time" That really doesn't make it right!
                No offence taken

                It is just to indicate it is an acceptable way to get AC into the panel just as connecting a portable generator is an acceptable connection.

                It does not mean a permanent connection with proper buss bar protection isn't the best way it only means it is not considered an unsafe way to connect an inverter.

                As with all procedures it is advisable to create a check list when connecting an inverter.

                IE. Trip all breakers that wont be used especially the battery charger/converter. Fridge should remain on DC.

                Do not use multiple appliances at the same time.

                No different than using a small generator.

                Some times we get too hung up on what is safe compared to what is expensive and not necessarily better.

                Comment


                  #9
                  check737 wrote:
                  No offence taken

                  It is just to indicate it is an acceptable way to get AC into the panel just as connecting a portable generator is an acceptable connection.

                  It does not mean a permanent connection with proper buss bar protection isn't the best way it only means it is not considered an unsafe way to connect an inverter.

                  As with all procedures it is advisable to create a check list when connecting an inverter.

                  IE. Trip all breakers that wont be used especially the battery charger/converter. Fridge should remain on DC.

                  Do not use multiple appliances at the same time.

                  No different than using a small generator.

                  Some times we get too hung up on what is safe compared to what is expensive and not necessarily better.
                  If you are going to follow your precautions as listed, then it should be OK...IMO...

                  Too many times we here after an incident when someone is hurt....Oh yeah, my mate does that all the time!!! That was the point I was making about what others do.
                  David
                  1999 Bayliner 1750 Capri. 3l Mercruiser Alpha

                  2014 Yamaha VX Cruiser

                  Comment


                    #10
                    Davidlyne wrote:
                    If you are going to follow your precautions as listed, then it should be OK...IMO...

                    Too many times we here after an incident when someone is hurt....Oh yeah, my mate does that all the time!!! That was the point I was making about what others do.
                    I agree, good point.

                    Comment


                      #11
                      Question: What is it that's preventing you from installing a slide bar lock-out main breaker arrangement, and a bit of re-wiring?

                      It would become Goof Proof!

                      (where it says "Generator", would now say "Inverter")


                      Rick E. Gresham, Oregon
                      2850 Bounty Sedan Flybridge model
                      Twin 280 HP 5.7's w/ Closed Cooling
                      Volvo Penta DuoProp Drives
                      Kohler 4 CZ Gen Set

                      Comment


                        #12
                        2850Bounty wrote:
                        Question: What is it that's preventing you from installing a slide bar lock-out main breaker arrangement, and a bit of re-wiring?

                        It would become Goof Proof!

                        (where it says "Generator", would now say "Inverter")

                        You know Rick not everyone is marine electrical qualified and it cost a lot of money $150 per hour up here to get things done.

                        What is wrong to just use a TV or microwave connecting the inverter to the shorepower.

                        It is safe and easy where as improper wiring in the AC panel could be quite dangerous.

                        JMHO

                        Comment


                          #13
                          check737 wrote:
                          ....... where as improper wiring in the AC panel could be quite dangerous.

                          JMHO
                          Goosh, I hope that no one took my comment as if to imply that "improper wiring" be done!

                          .
                          Rick E. Gresham, Oregon
                          2850 Bounty Sedan Flybridge model
                          Twin 280 HP 5.7's w/ Closed Cooling
                          Volvo Penta DuoProp Drives
                          Kohler 4 CZ Gen Set

                          Comment


                            #14
                            I think there are always 2 ways to look at "do it yourself" projects.

                            I for one don't want to ever take a short cut that eventually someone else can become the unsuspecting victim of my doing. I added a partition wall in my wife's old house - Yes, I could have run the electric myself - but I realized the fact that someday someone else was going to live in that house, and that's one liability I didn't want hanging over my head - we paid a certified electrician to do the work properly - or at least they take the liability off us.

                            Now when it comes to modifications on the boat - everyone is going to have an opinion on how things can be done versus how things should be done. I really do appreciate everyone's feedback - that's of course the reason I post questions here - to educate myself - I don't know everything

                            As my boat sits today, and with my personal life schedule - I don't have the ability/time to always do things the "correct" way - thngs like that take time. Absolutely putting in the switches, rerunning the wiring, etc etc is the right way to do it, and at some point in time, that is exactly what I will do - maybe over the winter when we are not able to take the boat out.

                            But living in the Seattle area, where you only get 3 days of sunshine a year to take the boat out - do you really think that's the time to take on a project of that magnitude when running an extension cord can still SAFELY accomplish the same end goal?

                            To me, it's never a question of not wanting to do it right - it's about juggling the time to do it. If I can SAFELY get through the summer with an extension cord running from the inverter directly into the shore power for the 1 night I may be on the boat using the TV - do you see where I'm coming from?

                            I do appreciate the feedback for how things should be done the correct way - and when time allows, it certainly will be something I look into doing. Or then again, I may stick with my original thought - leave the TV disconnected so it can only be used while at dock. I haven't made that decision yet.

                            Comment


                              #15
                              I am not a Marine electrician by no means, but I have quite a bit of electrical experience with Gen sets and tranfer switches etc. I believe what you are wanting to do is simply plug your shore power cord into the inverter AC outlet.

                              If so like some have mentioned you will need to make sure your battery charger(s) are turned off including any type of converter/charger built into your inverter if it has any. Also does your inverter have any type of a shore power sensor that would switch it or turn it off if it senses shore power?

                              I think that what you want to do can be done safely. Depending how your system is done it may not be practical. Your system may have breakers that can be turned off so that only the wanted outlets are supplied power. Do you have any schematics or wiring diagrams of your system?

                              Comment

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