all components and conduits are properly installed and both level and plumb. If
your work does not look good and is not professionally installed, most likely it
will not work well.
Testing and Programming Equipment
Test each string before connection. Test and document the voltage, current, and
polarity for each string. The strings should be tested quickly. The data from those
tests needs to be documented clearly for later use. The string voltages should be
very close—within 1 or 2 percent. The current measurement for each string also
should be close. The string voltages should be very close as should current mea-
surements. It would be good to test them twice for accuracy. Verify these measure-
ments before programming the operating mode.
After equipment installation, program the operating modes for the charge
controllers and inverters. Charge controllers and inverters come with factory pre-
set operating modes. However, the factory preset is not usually the best operating
mode for the PV system. The operating modes may need to be adjusted to the
system’s local design and conditions. Take your time determining exactly what
your settings and set points should be. Make sure to confirm them after they are
set. Bad programming will cause poor system performance.
For DC standalone PV systems, adjust the charge controller for the type of
battery used in the PV system. Make sure you use a battery temperature sensor.
Regulate the charge controller with a digital multimeter.
When designing and installing a project like the award-winning Civic Space Urban Park
Project, it is important to function as a team to resolve PV design issues that may be new to
the industry.
Courtesy of PerfectPower, Inc.
234 ADVANCED PHOTOVOLTAIC INSTALLATIONS
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