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Power
Centers in a PV Solar Systems
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A power center is a
consolidated unit that contains the circuit breakers, controls, and
monitors needed for home-generated power. It makes the job of installing
solar electricity much simpler and less costly. Power centers usually
contain two charge controllers (also known as voltage regulators) to
protect the batteries from being overcharged or too heavily discharged.
They control the charging current by sensing battery voltageThey have
different locations: 1. One is located
between the PV array and the batteries to keep it from being overcharged,
which causes serious damage to the batteries. This might happen while your
family is away from home for an extended time, such as on vacation. 2. Another is located
between the batteries and the wires leading to the circuit breakers. Also
known as a low-voltage cut-out, it prevents batteries from being too
deeply discharged, also a cause of serious damage to the batteries. When
the voltage drops below a preset level, it indicates that the batteries
are very flow. At this point the charge controller cuts out and terminates
the low of electrical current to the main service panel. You will not be
able to use power until the batteries are recharged. Power centers also
contain safety disconnects (circuit breakers). FYI:
The National Electric Code requires a disconnect between the PV modules
and the first charge controller. It requires a second disconnect between
the charge controller and the battery bank. A third disconnect must be
placed between the battery bank and the inverter. The power centers are
approved by the underwriter's Laboratory (UL). Back
to Solar Power Directory For
further information about Renewable
Energy or this area of Texas
contact Terry
Jensen Renewable Energy & Green Services
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