Marine Electronics

Keeping batteries fully charged is a science that cruisers have to master sooner or later. If todays high-capacity AGM batteries arent managed properly, valuable amp hours in can permanently trickle away through sulfation, as we saw in our test of AGM batteries (See Fighting Sulfation in AGMs, PS May 2015). Good battery management means complete re-charging that matches the charging profile of your battery, and this means an accurate sensing of battery voltage. As we saw in our recent report on battery monitors (see Best Battery Monitor Test Update, PS October 2017) a good monitor will also keep track of temperature, as this can be a limiting factor in charge acceptance rate.

Back in our October 2016 issue we looked at eight battery monitors and compared features, installation needs and overall usability. Unfortunately, we overlooked the Smartgauge made by Balmar. Thanks to our readers input we got our hands on one of these recently and ran it through the same test regimen we applied to the other eight monitors.

Our test gear comprised a ProMariner ProNautic 12-40P battery charger; West Marine-branded, flooded-cell, deep-cycle battery with a 75-amp hour rating; and two 120-volt, 70-watt incandescent light bulbs powered through a Heart 140-watt DC to AC inverter. This setup created a 12-amp DC load on the battery. We confirmed voltage and current draw using a Fluke Model 867B graphical meter and a Blue Sea Systems Model 8110-amp clamp/multimeter.

A number of the electronic devices that we tested this year are wireless products that interface with smart phones and tablet computers. Many of these products will also connect with the ships existing marine networks (NMEA) and hardware, and we encourage using these more robust connections for long-term cruising.

Finding good help in a far flung port may be easier as the Mariner Exchange app takes hold. The boating app sources marine services, separates them by type, and rates the vendor via consumer feedback.

I am a novice sailor, but after taking a few more courses, I plan to buy a 30- to 50-sailboat with a few other aficionados. Two questions:

Over the last few decades, theres been exponential growth in the availability of accurate weather forecasts and the net result is safer voyaging. Government spending on weather data gathering and forecast development has soared. Satellites and data buoys have filled in some of the oceanic gaps caused by an absence of weather balloon sampling at sea. State of the art, algorithm-driven, model data and ensemble-based forecasting have turned electronic guesswork into a better understanding of atmospheric volatility. The net result is an increase in the validity and reliability of marine forecasts and a trend that has stretched 24-hour forecast accuracy into 48- and 96-hour time frames. So, if anything deserves the label don't leave homeport without it, it is todays, better than ever, marine weather forecast.

Im a marine installer and weve come across another boat with a radio-frequency (RF) issue coming from a Frigoboat refrigeration system. The boat started with two Danfoss compressors and when one was replaced recently, the SSB whines when the new compressor is running. Weve run though the normal RF isolation procedures, but havent had too much luck yet. It seems like RF leakage might be a good topic to explore. What really works to solve it? What installation procedures are necessary?

When we plan what to put in each issue of Practical Sailor, we ask ourselves, Whats new in the sailboat industry? But of equal importance is considering the products that have weathered the test of time, evolved into a better product, or arrived in the marine market place from a non-marine manufacturer. This years United States Sailboat Show in Annapolis, Md., had answers to all of the above.

Our test focused primarily on the small-wire connections tensile strength, with and without solder, but we also looked at their durability under tough environmental conditions. We tested the pull-out strength without solder and the pull-out strength of soldered connections at 400 degrees by heating the connections in an oven to simulate overheating conditions. We tested fatigue by spinning a 6-inch length of splice wire at 650 RPM in a simple device that we called the wire-fatigue whirligig. Finally, testers soaked all samples for four months in salt water to accelerate corrosion, and then, we repeated the fatigue test.