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Ed Sherman

Okay, so one of your questions might be “Who’s Ed”? My name is Ed Sherman and I’m an award winning author of many magazine articles for publications like Cruising World, Boating, Soundings, Professional Boat Builder and Sailing World. I’ve also authored four trade books titled: Outboard Engines, Maintenance, Troubleshooting and Repair, The Powerboater’s Guide to Electrical Systems, The 12 Volt Bible For Boats and Advanced Marine Electrics and Electronics Troubleshooting. Most recently, I’ve co-authored a new text book with one of my long time editors, Tim Murphy entitled Fundamentals of Marine Service Technology. This new book will be available through the ABYC at the end of June, 2012.

I’ve been referred to as a “marine systems guru” by some of my editors over the years, and have served as a Boat Of The Year judge for Cruising World for several years. In addition to my trade writing endeavors, I serve as the Director of Educational Programming for the American Boat & Yacht Council (ABYC). I have designed all of the industry certification programs that the ABYC currently offers. In addition, I’ve created and delivered customized training programs for the US Navy, US Coast Guard and NOAA dealing with issues related to their small boat fleets. If you’re not familiar with the ABYC, you should be, we write the engineering Standards to which most boats are built today. You should check out the ABYC website, where you can learn more about me and the organization. Simply click here: ABYC to find out more.

I’m a nearly 40 year industry insider who loves to share what he has learned with other boaters’. This site is ultimately going to grow into quite a resource for boaters, both power and sail, as I add blog posts on a variety of marine systems related topics. So be sure to return on a regular basis to see what’s new.

Finally, I’m offering a free service to boaters, technical question Q & A. If I don’t know the answer to your marine systems related question, odds are I know someone who does and I’ll get you connected. simply register on my home page and send in your question. If I can’t answer it, odds are I can get you connected with someone who can. Understand that some questions may end up as part of an upcoming blog. Good questions sometimes need to be shared with everyone!

One Response to “About”

  1. September 28, 2018

    Bill Ebling says:

    Ed. US Inverter transfer switch operation while on European Shore Power question.

    I have taken a North American boat (AC wired for 120 v 60 hz with 30 amp shore power) to Europe for several yeats of cruising.

    Set up for European Shore Power:

    In preparation for Europe I added a 16 amp European shore power connector, Imediatly down stream I Added a 16 Amp mains breaker ELCI in a new dedicated European Msind inlet power box. From this I ran a branch circuit to 240 volt style recepticals (this branch has its own breaker in the new Mains inlet power box). My question below will not concern these dedicated 240 receptacles.

    I also ran from the 240 v mains box another branch to a 3.6 kw isolation transformer that steps voltage down to 120v 50 hz

    This later output then runs to a double pole selector/ lock out switch (30 amp breakers). This lockout-selector switch selects from which shore power inlet I power the rest of the boat with (US 120 V shore power inlet or European 240 shore power inlet. From the 240-120 shore power lockout/selector switch the power goes to my original main AC Panel. (Retaining the US shore power inlet allows me to hook up a small Honda genset I purchased in the US to provide backup power while at anchor if need be. The selector/lockout switch also insured for safety that the US shore power Hubble connector is never hot when connected to European shore power and vice-a-versa). The 120 V shore power inlet is protected with its own galvanic isolator)

    All of this is working fine (I am aware that all the original AC circuits are now 120 V 50 Hz when on European shore power; this has not been a problem)

    Powering the original AC 120 V recepicles

    All of the original AC recepticals are feed from the Original AC mains panel via off an AC sub panel whose power lead first passed through a Xantrex 1800i sine wave inverter with an automatic transfer switch. This allows these AC receptacles to be powered by the inverter or from shore power. The AC input to the inverter has its own breaker that can disconnect the receptical sub panel from the main AC panel and the inverters transfer switch. The inverter when energized can then supply the receptical sub panel

    BTW: The hot water heater and the 50-60 hz battery charger come directly off their main AC panel breakers and do not pass through the inverters transfer switch.

    So after that introduction here is my question;

    1. If I leave the inverter off and the inverters AC transfer switch input breaker on I get 120 V 50 hz as expected at the receptical sub-panel and it’s 120V receptical branch circuits. Check. This is as I intended

    2. If I first turn the inverter AC transfer switch input breaker to off and then turn on the inverter I get 120 V 60 hz on the receptical branch sub-panel and its down stream recepticals as expected. Check as intended. The battery charger keeps the batteries topped up as the inverter draws from them to energize the 120 house receptacles.

    QUESTION; What will happen if I forget to turn off the inverters AC transfer switch input before turning on the inverter? Murphy’s law says I will eventually do this. Will the transfer switch allow the inverter to inject its 120V 60 Hz on top of the the House 120V 50hz and create a dangerous situation.

    After many attempts I have not been able to have Xantrex tell if the transfer switch is a “safe” true lockout switch ( the inverter can never combine its energy with what’s coming in from the 50 hz yransfet switch input); or in my situation a dangerous “combiner” switch. All the have told me is that the transfer switch will not work if there is 50hz at the AC input “and will not transfer”

    Sorry for the lengthy preamble to the question. Any Thoughts? Am I protected against Murphy?

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