Hawke’s Bay
Manual
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Low PV Voltage
As explained earlier, the
Hawke’s Bay
needs the PV Voc input to be at least 240V to perform
MPPT operations. If the Voc is lower than that, the
Hawke’s Bay
may rest.
How are your panels wired? If all the panels in your array are wired in parallel, the
Hawke’s Bay
sees the voltage of a single panel. In a parallel configuration the
Hawke’s Bay
will rest.
Solution
–
Wire the panels in series, but not to exceed the Haw
ke’s Bay’s voltage input
of 600V. The
Hawke’s Bay
needs a minimum Voc of 240V.
Is the IN voltage 0 on the MNGP2? If yes, check for reverse polarity on the PV input.
Battery Over-voltage
Ensure the battery voltage is below the Absorb and Float voltage setpoints. If not, do you have
another charging source (2
nd
solar, wind, inverter-charger) on your battery bank? If so, turn it
off until you finish troubleshooting the
Hawke’s Bay
.
Disappearing PV IN Voltage
Disconnect the PV wires from the Hawk
e’s Bay’s input terminal block. Using a multimeter,
measure the PV voltage directly from the PV wires. Is voltage present? If not, see PV INPUT
ISSUE section above. If voltage is present, reconnect the PV wires to the
Hawke’s Bay’s
terminal block. Be mindful of polarity and always turn off circuit breakers before connecting or
disconnecting any wires. With the PV wires connected, does the IN voltage drop to zero or near
zero volts? If so, check for a high resistance connection or the
Hawke’s Bay
may be defective.
Bulk-to-Resting
Is your
Hawke’s Bay
switching between Bulk and Resting? This means the
Hawke’s Bay
is trying
to make power, has sufficient PV input voltage, goes into the Bulk charging mode, then very
quickly switches to Resting.
•
If PV IN voltage drops to battery voltage or close to it, the problem is probably a bad PV
connection.
•
If PV IN voltage remains the same or at a normal level, the
Hawke’s Bay
has probably lost its
FET drive.
NOTE
: With the PV wires disconnected from the
Hawke’s B
ay or the PV input circuit breaker
turned off, does the MNGP2 show some IN voltage? If yes, this is a good thing. If you see 0V,
that is a bad thing. The
Hawke’s Bay
needs repair.
Will Not Turn On
•
Check
Hawke’s Bay
battery circuit breaker.
•
Check for reverse polarity of battery positive and negative connections to the
Hawke’s Bay
.
