The batteries pictured are Rolls S6 250 flooded cells, nominally 281 a/hr. They came with the boat and are of unknown age but currently seem to work OK. They are not the cell I would pick as they are a lightweight battery. The clue is that the spec sheet gives a CCA number. True deep cycle cells don't have that. The taller L16-EX is rated at three times the cycle life, about 3,750 cycles to 50% DoD compared to these at 2,000. You really do need to look at the full spec to know what you are getting! In Canada these are currently around $320 com-pared to the L16 at $590. The black battery is the starter battery which is a simple H/D car battery that starts the engine and supplies the windlass. (Photo/ Roland Stockham)

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Can You Run a Marine Air-Conditioner on Battery Power?

Our 16,000 BTU MarinAire A/C is sufficient to maintain our Privilege 435 catamaran at under 26.5°C (80°F) on days up to around 35°C (95°F)....

Taking Care of Your 12-Volt Lead-Acid Battery Bank

Marine boat batteries can fail due to various reasons, and understanding these potential failure modes is crucial for ensuring their reliability. Here are some...

Check Your Shorepower System for Hidden Dangers

One of the often overlooked maintenance items in the pre-season rush to the water is the AC shorepower system. Over the years of surveying, Ive amassed a small collection of scary photos from past surveys showing the common examples of neglect to this critical system.

DIY survey of boat solar and wind turbine systems

Many used cruising sailboats on the market will have a couple of solar panels, a wind turbine, or possibly both. But are they working?...
A lithium conversion requires a willing owner and a capable craft. Enter the Privilege 435 catamaran Confianza.

What’s Involved in Setting Up a Lithium Battery System?

Our 2004 Privilege 435 Confianza (Connie for short) came equipped with traditional lead-acid batteries—5 100ah for the house bank and 2 starter batteries. We...

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The Tayana 55 is one of the most tempting used bluewater cruising sailboats on the market: a 55-foot center cockpit offshore yacht with serious...

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