Rolls LFP Reference Documents:

Visit the links above, or for the most recent version of published documents.

Certain configurations, installations, services, and operating tasks should only be performed by qualified personnel in consultation with local utilities and/or authorized dealers. Qualified personnel should have training, knowledge, and experience in:

  • Installing electrical equipment
  • Applying applicable installation codes
  • Analyzing and reducing hazards involved in performing electrical work
  • Installing and configuring batteries

No responsibility is assumed by Rolls Battery for any consequences arising out of the use of this material.


Read Rolls LFP ESS Battery Operating Manual and safety instructions before installing the battery. 

Read SMA Inverter manuals for guidance on product features, functions, parameters and how to use the product safely.



Connecting your Rolls S48-100LFP ESS Battery to SMA inverters over CANBUS


To enable communication with a SMA inverter, the protocol must be set using the Rolls LFP Desktop App, and the setup steps below.

Physical Setup

Figure 1: Pack 1 DIP Address for RS485 only.

 Steps to setup are:

  1. Ensure the S48-100LFP ESS BMS is activated by hitting the RESET button. The SOC and RUN lights will be on.
  2. Address the DIP switch on the S48-100LFP ESS unit(s)
    1. If only one connected, address to Position 1 (See Figure 1).
  3. Connect the included RJ45-DB9 cable to one of the RS485 ports on the front of the battery.
  4. Connect the DB9 cable end to the RS485 to USB Serial adapter. 
    1. Ensure the USB Serial adapter appears in device manager and the proper COM port is reflected in the software, below.
  1. Connect Rolls battery terminals (+ and -) to SMA inverter/charger.
  2. Connect Directly to the BMS CAN port of the inverter/charger.
  3. Use straight RJ45-RJ45 cable to properly connect the CAN-bus signals with most SMA inverters.
  4. Ensure the breaker is set to the “ON” position.
  5. Launch Rolls LFP Desktop App on your PC to configure CAN-bus mode.


Software Setup – Rolls LFP Desktop

Within the computer software Rolls LFP Desktop, after connecting to the battery…

  1. Select the appropriate COM port on your computer.
  1. Select a baud rate of 19200
  1. Select “Pack 1” from the righthand menu in Rolls LFP Desktop. (Or other, if directly connecting to another battery at a different address.
    1. Double check that the DIP switch is properly addressed to match.
  1. Select “Connect” and wait for connection to be established (1-3 seconds).
  2. Configure the unit to communicate with SMA devices.
    1. Click CAN on the top ribbon.
    2. Double click “SMA-SF” for SMA.
    3. Wait for the confirmation popup.
  3. Ensure that the “BMS Information” Section at the bottom of the screen has updated to reflect the SMA CAN-bus Protocol.

SMA CANBUS Connection

  1. Ensure the output of the S48-100LFP ESS is disconnected, by setting the breaker on the front of the device to “OFF”.
  2. Return the DIP switch to the proper address for CANBUS mode.
  3. Connect the positive and negative terminals of the battery to the inverter, following applicable instructions, current, and code requirements.
  4. Connect the CANBUS port of the inverter to the CANBUS port of the Rolls S48-100LFP ESS
    1. Many SMA inverters use the following pinout for their CAN communication, which will require a custom cable to connect with the Rolls S48-100LFP ESS, due to the position of the CAN ground pin.
    2. Always refer to the specific manual for your device, as specifications may vary or change. 

Rolls Pin

Rolls Battery


SMA Inverter



















  1. Power-on the inverter by setting the breaker on the S48-100LFP ESS to “ON” and hitting the “RESET” button on the front of the unit.

SMA Device Setup and Debugging

Setup for the SMA device should be done using the SMA online portal, at Or, through the SMA Energy App.

  1. On the Sunny Portal site, first Log in or create an account.
  2. Create a new power station for your system.
  3. Ensure that the inverter and system components have been successfully connected to your network router.
  4. Locate the PIC and RID numbers on the side of the inverter.
  5. Enter the PIC and RID values into the Sunny Portal setup and click “Identify” to attempt to find your device.

Once found, you can access the inverter directly via your router while on the same network.

  1. Log into your router by accessing the router IP address in your web browser.
  2. Create a login password you will remember.
  3. You may need to log out and relog for information to appear for your new install.
  4. Enter the Settings area:
    1. Set the Date and Time, output frequency and other settings like phase, generator, etc.
  5. Set battery to Lithium-Ion
  6. You should be immediately able to view “Instantaneous Values” reported by the BMS via the toolbar on the device page.
  7. In Device Parameters, the BMS should automatically upload the requested charge and discharge current, based on the number of connected units over RS485 connection.


Maximum Battery Operating Limits

The battery should not be operated outside these operating limits. The BMS will open its internal switch and disconnect the battery if any of these limits are exceeded.

Maximum Operating Limits

S48-100LFP ESS

Continuous Discharge Current*

63 Adc

Continuous Charge Current*

50 Adc

Peak Current (300 milliseconds)

500 Adc

Operating Voltage (Min / Max)

41.6 V / 58.4 V

Charge Temperature (Min / Max)

0°C / 55°C (32°F / 131°F)

Discharge Temperature (Min / Max)

-20°C / 60°C (-4°F / 140°F)

Storage Temperature (Min / Max)

-5°C / 45°C (23°F / 113°F)

*Effects of AC Ripple must be taken into consideration when sizing/configuring a system

Note: Intentional bypassing of a BMS to operate a battery outside its maximum and minimum limits voids warranty and may lead to safety concerns.

Minimum Battery Capacity

Using large solar arrays with battery banks that are too small can exceed the operating limits of the battery, potentially triggering over-current protection in the Battery Management System (BMS). Battery capacity must be sized to accommodate the maximum charge current of the system, or the charging devices must be adjusted to charge below the operating limit of the installed batteries. This value is determined by summing the charge capacities of all inverter/chargers and solar charge controllers in the system. Additionally, the battery peak capacity must be sized to support the surge requirements demanded by the load connected to the inverter. Ensure that the sum of all inverters peak power values matches the sum of all battery peak current values.