Electrical

Delfin is intended to be self sufficient to the extent possible.  To that end, a large house bank was installed with twelve 210 amp Northstar AGM batteries, holding 1260 amps at 24 vdc.  This allows sitting at anchor for a couple of days without re-charging.  The starter bank is comprised of two 8D wet cells, joined to the house bank and charging system through a Blue Seas latching combining relay.  Charging is managed through a Balmar MaxCharge unit interfaced with an Ample Power 186 amp, 24 vdc alternator, shore power, and a 130 amp charger built into a Trace 4024 Inverter/Charger.

Shore power is provided via an isolator transformer that stablizes current from 90 volts to 250 volts, providing 240 vac as needed.

Two electrical panels are used - one combination 12/24 vdc, 120 vac located in the pilot house and one combination 12/24 vdc, 120/240 vac panel located in the engine room.  240 volt loads include the range, the washer and dryer and air conditioning.  Unless connected to shore power, the genset must be run to power these devices, so genset time is also cooking and washing time.  The genset is a Northern Lights 20 kw unit.  A Link 20 monitor is located in the pilot house for keeping track of battery status and charge rates.

A remote switch panel allows for stepping the transformer to match incoming shore current, as well as switch between shore power and the genset as the source current.

The Trace 4024 works very well, providing clean 120 vac for the computer and other ac applicances.  A secondary monitoring panel for the Trace is located on the remote switch panel, which makes programming a little easier than kneeling at the Trace unit's location in the engine room.  The Northstar batteries are stellar.  They will recharge initially at over 275 amps per hour when the genset and alternator are turning, meeting a very high acceptance rate of the batteries for a couple of hours before tapering off as the house bank reaches 80% recharged.  Because the AGM batteries are located in the E/R, one concern was keeping the batteries cool enough that their life span can be maximized.  This was addressed by piping a direct flow of cool outside air to the battery bank that comes on when the E/R fans are on.  The result is that the AGM are kept to within 10 degrees of outside shade temperatures, and should hopefully give long life.