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Compressors, how fast should they run?

We had an inquiry recently from someone asking if it was necessary to have some form of speed control on Secop/Danfoss BD35 and BD50 refrigeration compressors. Well the simple answer is “no, it’s not absolutely necessary”, but without it your system may be working way below its capabilities, and with less efficiency.

You see, the Secop (formerly Danfoss) BD35 and BD50 compressors are capable of being controlled externally to run at various speeds between 2,000 and 3,500 RPM, and the cooling capacity is directly linked to compressor speed; i.e. the lower the compressor speed, the lower the cooling capacity.

So why not simply run every compressor at the highest speed and cover all the bases?

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Did you know that if you store wine at higher temperatures than 65°F, you will actually be accelerating the aging process? Conversely, storing wines at colder than 45°F means they will not fully develop, robbing the wine (and yourself) of its full potential. Even that inexpensive bottle of Chardonnay you bought on sale last week can be adversely affected by storing it under your boat's salon settee until you've made room in the ice box, which in itself is normally at 40°F, so not a good place to put your wine anyway.

The temperature at which you store, and serve, your wine will have an impact on its flavor and your enjoyment. Especially if you plan to store your wine for at least 6 months, you know, for that cruise you've been planning to take before life gets in the way. On my boat, wine doesn't last long in storage, but that doesn't mean I want the taste to be compromised because I didn't handle it correctly. Something that could be so easily fixed.

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They say there’s no such thing as bad publicity, but go tell that to the few fledgling marine lithium-ion battery manufacturers of a few years ago. The well-publicized failures of a few specialized batteries sowed the seeds of doubt and insecurity regarding the safety aspect that we’re still trying to shake off to this day.

Sure, it’s well known that, compared to lead-acid equivalents like AGM’s, lithium-ion batteries are lighter, deliver far more power, charge much, much faster, have a lot more useable capacity, will last many times longer, and are a far more savvy investment over the long run. But could they actually be as safe, or better still, safer than good ol’ lead-acid versions?

Let’s first look at how unsafe lead-acid batteries can become when abused, charged from faulty or incorrectly set equipment, and manufacturers’ guidelines are ignored.

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