PacWind SeaHawk Owner's Manual - Appendix 2
and negative (-) DC bus, so they all experience the same DC voltage. The DC voltage of the
system is largely determined by the state of charge of the battery bank and to a lesser, but still
significant, extent by the charging or discharging rates (the rate at which DC current, or amps, is
being created or consumed).
Charging components, such as wind turbines, solar arrays, and inverter/chargers (powered by a
back-up generator or the power grid), can be added to a DC-bus system with separate charge
regulators and these regulators can operate completely autonomously (e.g., they do not need to
communicate with each other or be coordinated using a central system controller). The separate
charge regulators, whether there is just one or if there are a dozen, will respond to the DC-bus
voltage and control their generators charging current.
When putting together or adding to a DC-bus remote power system there are a few pitfalls to
avoid if possible:
•
Battery banks that are too small, so that battery voltage swings too much with high charging or
discharging currents.
•
Multiple charge regulators set to the same voltage, so that there is one big
step in charging current rather than several smaller ones.
•
Setting high voltage regulation points too low so that the batteries don’t get fully
charged
•
Setting the low voltage disconnect (typically part of the inverter) too high so that the battery
bank capacity is underutilized
Appendix 2
SEAHAWK SPECIFICATIONS
TURBINE:
•
CAGE DIAMETER 76.2 MM 2.5 FT
•
OVERALL LENGTH 120 MM 4.0 FT
•
TURBINE WEIGHT 35.8 KG 140 LB
•
RATED POWER 1,000 W
•
RATED WINDSPEED 19.3 M/S 43 MPH
•
RATED ROTOR SPEED 608 RPM
•
START-UP WINDSPEED 1.35 M/S 3.0 MPH
•
CUT-IN WINDSPEED 3.6 M/S 8.0 MPH
•
MAX DESIGN WINDSPEED 54 M/S 120 MPH
•
MAX POWER OUTPUT 3.40 kW
•
TURBINE INPUT FUSE 60 AMPS
•
BATTERY FUSE 90 AMPS
•
OPTIONAL PHOTOVOLTAIC INPUT FUSE 30 AMPS
•
DUMP LOAD FUSE 60 AMPS