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Connecting a Seplos BMS battery

Introduction

The steps below apply to many different batteries that use the Seplos BMS:

  • Shoto
  • Lithium batteries South Africa (LBSA)
  • Trophy battery

This guide established RS485 communication between SolarAssistant and the battery. Always read the instructions in your battery/BMS manual and prefer that above the information below.

If your inverter is already reading your battery via CAN, then it's not readable via RS485 at the same time because the master battery dip switch will be set to CAN. This dip switch makes the master itself not readable via RS485 and the master then occupies the RS485 cables for communication with the slave batteries.

Protocol selection

On the SolarAssistant configuration page, select the protocol below.

USB cable

You can use our seplos BMS cable or create your own by using a USB RS485 adapter with the cable crimped into a RJ45 plug according the pinout as depicted in the manual. Only one cable is required to monitor all batteries in parallel.

The USB RS485 cable from the SolarAssistant monitoring device is plugged into the left RS485 port of the first battery pack. The right RS485 port is to connect the next battery pack via a normal straight computer network cable.

Dip switch configuration

As described in the manual, set the first pack to address 1, second to address 2, etc. Note dip switches only take effect after battery restart. Enabling dip switch 5 is for CAN communication and should not be done since we are using RS485.

Result

Once you press connect in SolarAssistant, you should see each pack show up under the battery section. If you make any cabling or dip switch changes, ensure you press disconnect and connect in SolarAssistant to rescan available packs.

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