Victron energy MPPT 150/70 Manual page 31

The programmable relay offers three connections:
• NO (Normally Open)
• C (Common)
• NC (Normally Closed)
Relay State Connection
between
Switched C and NO
ON
Switched C and NC
OFF
Relay mode
Relay always off This option switches the relay OFF. It will disable the other relay options. Use this option if you do not
plan to use the relay function.
Panel voltage This option switches the relay ON when the panel voltage becomes too high.
high
Panel voltage High settings Panel high voltage. (User-defined Voltage) Clear panel high voltage.
(User-defined Voltage) This option switches the relay ON when the panel voltage rises above the
chosen "Panel high voltage" setting, and switches the relay OFF when the panel voltage falls below
the chosen "Clear panel high voltage" setting. Ensure, of course, that the "Panel high voltage" setting
is greater than the "Clear panel high voltage" setting. These settings must never exceed the maximum
voltage-rating allowed by your MPPT charger.
High temperature This option switches the relay ON when the charger output current is reduced due to high
(Dimming) temperatures. Use this option to for example switch an external fan.
Page 27
MPPT solar charger manual
Internal operation of the programmable relay
Description and notes
Configuration and settings