Batteries and DC power systems are a subject of discussion wherever cruising yachts meet. The system we are using in the FPB Series is based on industrial quality traction batteries (so called because they are used in forklifts, railroad systems, and other heavy service applications). Our first experience with traction batteries was in 1988 with Sundeer. Every yacht we have done since has used these wonderful batteries.

On our sailing designs the traction batteries are stored in the keel. On the FPB Series these are in the “basement”.

Traction batteries offer several advantages over conventional batteries:

• Longer life (as many as 3500 to 5000 cycles when only discharged to the 50% mark).
• Designed for 80% depth of discharge (1200 cycles).
• Long life (15 to 18 years).
• High reliability.
• If an individual cell goes bad it can be replaced.
• More abuse tolerant than standard construction.
• Fast charge acceptance compared to conventional batteries.

The initial battery cost of these batteries and labor to fabricate brackets and install them is substantial. But once you get past the five year point they really begin to pay off.