In spite of good intentions, unless those who are carrying out the analysis are trained in the proper procedures, a great deal of time, and money, can be wasted.Ĭounterintuitively, while misalignment can lead to other issues, because of its constant nature it rarely causes a vibration. Identification of vibration sources can be very challenging indeed. Is there a simple solution to this problem? I’ve thought it would be very convenient if there was a device through which all charging sources were directed that provided the desired charge voltage. So in cruise mode the batteries will be undercharged. However, the alternator charges at 13.9 and the solar panel is about the same. A recent conversation with the manufacturer (Deka – Penn) suggests charging at 14.4 would improve battery performance. The charge voltage would seem to be 14.1 to 14.4 v. So to me the vibration is a bit of a mystery. The dealer tells me it is a result of the horsepower (?), the builder says to check the alignment but perhaps it is hull flex, doubtful if it is prop related as the prop is new (Acme). There are noticeable vibrations from 2300 – 2900 rpm. The drive line is more or less in line, in that the shaft is easily turned by hand (Yanmar 6by2 – 260 in a Ranger 29). I have two issues which you might comment upon. Thanks for your many informative articles. For more on over-current protection, see this article. Ultimately, while some exceptions exist, there’s no good reason to use fuses in shore power applications. If fuses are used, and just one blows, onboard equipment could be damaged or a fire could ensue. In this case, however, while both legs are protected, fuses have been used, thereby violating the “simultaneous trip” requirement of the Standard, which can only be achieved by a two pole, interlinked circuit breaker. For 120-volt AC systems, like the one shown in the accompanying image, both the “hot” (black) and the “neutral” (white) conductors must be protected. Where shore power is concerned, ABYC Guidelines clearly mandate the use of “simultaneous trip” circuit breakers for primary supplies used in both 120-volt AC and 240-volt AC systems. If these utilize fuses, and your spare supply is limited, you could find yourself in a difficult situation. While fuses are often used, autopilots, shift/throttle controls and engine electronic control units (all are DC) for instance, are better served by circuit breakers, because they can be reset in the event of a troubleshooting because scenario, where they trip multiple times before the fault is found. In many cases fuses or circuit breakers can be used interchangeably. Over-current protection is among the most important features of any vessel’s electrical system in simple terms it involves the use of the correct fuses and/or circuit breakers, in the right capacity, and installed in the right location. Text and photos by Steve D’Antonio © 2019 Photo Essay: Shore Power, are Fuses OK?
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