When communication has been established, the MPP Solar Inverter can re-configure its charging voltage, current, and battery discharge cut-off voltage according to the battery’s parameters. If parameters are outside of a safe range, the inverter can start or stop in order to protect the batteries.

Cables

To establish communication with an MPP Solar device, a special cable must be used. This cable can either be purchased already made or can be created by following the pinout table below. Pre-Purchased cables must be checked upon receipt to ensure they are labeled as “For use with MPP Solar”, otherwise an incorrect cable can lead to difficulty communicating.The following table depicts the pinouts used on the MPP Solar Inverter, as well as the RS485A port of the SK48v100. When hand-making cables, we highly recommend confirming the pin configurations, as mistakes can lead to very difficult-to-troubleshoot problems.

MPP Solar / SK48v100 Pinout Table
Function MPP Solar SK48v100
GND Pin 8 Pin 6
RS485A Pin 5 Pin 7
RS485B Pin 3 Pin 8

If you wish to use your own cable, do so with caution; the following pinout table creates a cable that is unidirectional, so only the end labeled “SK48v100” must be plugged into the battery, and the end labeled “MPP Solar”’ must be plugged into the inverter. If this is reversed, then communication cannot be established.

Connector #1 (MPP Solar) Connector #2 (SK48v100)
Pin 1 Pin 1
Pin 2 Pin 2
Pin 3 Pin 3
Pin 4 Pin 4
Pin 5 Pin 5
Pin 6 Pin 6
Pin 7 Pin 7
Pin 8 Pin 8

Note: The connector on the MPP Solar side has all wires noted so that it’s easier to align the wires within connector. Connections to the unused pins is NOT required, however makes insertion of the wires in the connector far easier. Do not connect these unused wires to any of the pins on the SK48v100.

Connection port & Procedure

Power off the entire system, including turning off the BMS. We recommend keeping any AC inputs to the MPP Solar inverter OFF during this procedure. After the cable(s) have been installed, power up the system making sure to follow the proper start-up procedure.

The communication cable plug marked “SK48V100” plugs into the “RS485A” port of the master battery. Verify the DIP switches of the master battery are set to address #1, ON-OFF-OFF-OFF as described previously and slave batteries are set to unique address as designated here.

The remaining end of the cable marked “MPP Solar” plugs into the “LI-ION” port of the MPP Solar unit.

Ensure all batteries are in the “BMS-OFF” state prior to installing the cable(s. After the cable(s) have been installed, power up the system making sure to follow the proper start-up procedure.

Voltronic inverters (MPP Solar / SunGoldPower / EG4) require a change of the protocol of 1 battery (the “Master” battery) to utilize the proper protocol for communication.  It is also required to follow this process if you are switching inverters, for example upgrading from an inverter that does not support communications to a Voltronic unit.

Battery Protocol Edit

Step 1: Plug in programming cable

Make certain that the cable is fully inserted into the port. If this is the first battery being programmed and the PC software is not yet opened, the screen won’t turn on. If the PC software is already open and running, then the screen should light up as soon as the cable is plugged in.

Step 2: Open PC Software & Connect to battery

After the cable has been plugged in, open the programming software and click the red “OPEN” button in the top right corner. After clicking open click “TRY CONNECT”. Do not worry about entering the password for this procedure.

Step 3: Confirm proper connection

If you have properly established the connection to the battery, the software should load the voltages and statuses of the battery. In the top-right corner of the program there is a readout that shows the default protocol as “Pylon(DeYe) CAN”.

Step 4: Change protocol

From the menu below the protocol indication, select the “Pylon 485” protocol.

Step 5: Confirm the change was successful

Now, the indicator for protocol should read as “Pylon 485”. You can now close the software and disconnect the RS232 cable.

MPP Solar Menu Settings

Disclaimer: The following menu options described were determined based on the MPP Solar LVX 6048, and LV 6548. Different models may have slightly different menu options. If you notice a discrepancy, please contact us so that we can provide an addendum to this section.

  1. Press & hold the “⏎” key for approximately 3 seconds to enter the main menu.
  2. Using the up and down arrows, navigate to setting (#14 LVX 6048) (#5 LV 6548). Press the “⏎” key to change the setting. Using the up and down arrows, adjust the setting parameter until “PYL” is shown. Press the “⏎” key one more to save the setting.
  3. For systems using only 1 battery, navigate to setting 11 (Maximum charge current) and set this parameter to 100A. This is the maximum charge current one single battery allows. For multi-battery systems, this setting can be set no greater than 100*(number of batteries).
  4. Press the ESC button to exit the menu and save settings.