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INSTALLATION:
Step 3: Grounding
The MP3768 uses a common-negative controller. Negative terminals of
the PV array, the battery can be grounded simultaneously, or any terminal
is grounded. However, according to the practical application, the PV
array’s negative terminals, battery, and load can also be ungrounded.
Simultaneously, the grounding terminal on the shell must be grounded,
which eectively shields the electromagnetic interference from the
outside and prevents some electric shock to the human body due to the
electrification of the shell.
CAUTION
For common-negative systems, such as the RV system, it is
recommended to use a common-negative controller. If a
common-positive controller is used and the positive electrode is
grounded in the common-negative system, the controller may
be damaged.
Step 4: Connect Accessories
• Connect the remote temperature sensor cable
Connect the remote temperature sensor cable to the
interface and place the other end close to the battery.
CAUTION
Suppose the remote temperature sensor is not connected to the
controller. In that case, the controller can charge or discharge the
battery at the default 25 °C (no temperature compensation).
• Connect the accessories for RS485 communication; refer to the
SETTINGS section.
CAUTION
The internal circuit of the RS485 port has no isolation design. It is
recommended to connect an RS485 communication isolator to
the port before communicating.
Step 5: Power on the controller
Closing the battery fuse will power on the controller. Check the battery
indicator status (the controller is operating normally when the indicator is lit
green). Close the fuse and circuit breaker of the load and PV array. Then the
system will be operating in the preprogrammed mode.
CAUTION
If the controller can not work properly or the fault indicator shows
an abnormality, please refer to the Troubleshooting Section.
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