MidNite Solar Communication Adapter User Manual Rev A
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P a g e 1 0 - 2 6 9 - 1 R E V : -
Battery Set Voltage
is sent by the Sunny Island to the Communication Adapter in ComSync format and is
processed into three separate MODBUS messages. They are ABSORB voltage, FLOAT voltage,
and EQUALIZE voltage. The same set voltage value is used for all three parameters and sent to
each Classic (up to twelve MODBUS messages) approximately every 30-60 seconds. Any offset
adjustments are made in the Classic.
COMISSIONING THE SYSTEM
When everything is ready to go, energize battery power to the Classics. The Communications Adapter is
powered from Classic #1 (MODBUS address #10) via the communications cable.
Set (verify) that the Classic controllers’ addresses are set to #10, #11, #12, and #13 for Classics 1-4
respectively.
On EACH classic, go to MAIN MENU->MISC->COMM->MORE and select the SMA option. Save it and
REBOOT the Classic.
Verify that the MNGP displays read proper battery voltages, and that the Classics appear to be operating
properly.
Energize PV power to the Classics.
Go the Communication Adapter and plug in the MODBUS cable coming from the first Classic (#10). The
LEDs should start showing activity within a few seconds. The Communication Adapter may take a
minute or two to establish communication and collect voltage, current and power data for all the
Classics in the system.
Use the Sunny Island menu buttons to navigate to the External Charge Controller meters. (Mrnus #142 -
#145). Verify that the Sunny Island display shows the expected voltages, currents and power readings.
Check that the display at the Sunny WebBox agrees with the Classic MNGP displays. The Classic
Software revisions for are displayed on the Sunny WebBox as the software build number divided by 100.
For example, the Classic status screen for unit 1 shows:
1686: 1/15/2014
WebBox Spot Values screen for that Classic will say:
95 Sic1SWVers 16.86
as shown on the screen capture below.
The four values for each charger are displayed as: EgyCntIn,PvPwr, SWVers, TdyEgyCntIn, and are
displayed on the Spot Values display. Refer to the Sunny Island and Sunny WebBox for details.
