SunSaver MODBUS Specifications

Reports alarms identified by self diagnostics that occurred today. Each bit corresponds to a specific
alarm. If a bit is set, that alarm occurred at least once today. Bit order is identical to the
alarm_hi/alarm_lo bitfield.
Vb_min
[52][0x0033] (V). Minimum battery voltage
Tracks the minimum battery voltage over time. This value is set equal to the present battery voltage
when a Ah / kWh reset is requested through the meter or Modbus Coil.
Vb_max
[53][0x0034] (V). Maximum battery voltage
Tracks the maximum battery voltage over time. This value is set equal to the present battery voltage
when a Ah / kWh resets is requested through the meter or Modbus Coil.
Va_ref_fixed
[58][0x0039] (V). Array Voltage fixed target
Write a voltage value to this register to fix the Array input voltage to a specific value. If this register is a
non-zero value, the MPPT function of the controller will stop (sweeping and tracking are disabled) and
the array input will be fixed to the specified voltage. This value can be written at anytime during
operation to adjust the array voltage target value. On start-up, this value is initialized with the non-
volatile EEPROM value in register 0xE036.
Supported in V08 firmware and later.
Va_ref_fixed_pct
[59][0x003A] (%). Array Voltage percent of Voc voltage target
Write a value to this register to fix the Array input voltage to a percent of the Array open circuit voltage.
If this register is a non-zero value, the MPPT function of the controller will stop (sweeping and tracking
are disabled) and the array target voltage will be fixed to the specified % of array Voc. The controller
will perform periodic Voc checks and move the array voltage if needed to maintain the correct % target.
If this register value is changed, the array voltage will not adjust until the next Voc check.
On start-up, this value is initialized with the non-volatile EEPROM value in register 0xE037.
Supported in V08 firmware and later.
Note: if the Va_ref_fixed (0x0039) register is non-zero, it will override this setting.