Sinexcel PWS1-500KTL

Compatibility

Compatible with EpiSensor Edge over Modbus TCP or Modbus RTU, with Sinexcel's PCS protocol document

The PWS1-500K series manual V4.0 states that the PCS supports Modbus over RS-485 and Ethernet for remote signalling and metering, with Modbus RTU on RS-485 as the default EMS link and Modbus TCP/IP on the touch screen's Ethernet port. Edge is a Modbus TCP and Modbus RTU client. The addresses, types and scales come from Sinexcel's PCS communication protocol for the installed firmware, which is not on the public download page.

PWS1-500KTL-EX and -NA without STS, power codes 1M1 to 8M1 in manual V4.0 and string variants 8M1, 8M4 and 8M8 in the 5 September 2025 datasheet. Site check: obtain Sinexcel's protocol document for the installed firmware, read operating status and total active power, and compare them with the touch screen AC Info page. Keep the site EMS as the only controller. Read-only monitoring; active power, reactive power, DC current and start or stop commands are out of scope.

Connect it with

• Modbus Interface ZMB-3X From €399 ex VAT Configure
• Wireless 3-Phase Electricity Monitor ZEM-65 From €625 ex VAT Configure
• Gateway ZGW-20 From €899 ex VAT Configure
• Evaluation Gateway on a Raspberry Pi Edge with one device licensed Free Set up

Models

Specifications

The PWS1-500KTL is a non-isolated, three-phase, three-wire PCS for 600 to 900 V DC batteries. Its power scales from 62.5 kW to 500 kW with one to eight power modules, and the datasheet offers one, four or eight battery strings. It runs grid-tied or stand-alone; off-grid parallel operation of several PCS is a customised function.^1, 2

Power

500 kVA nominal and 550 kVA maximum for 8 modules, in 62.5 kVA steps down to 62.5 kVA for 1 module^1, 2

AC connection

3-phase 3-wire, 400 V (-15% to +15%) grid-tied; 380 / 400 V (±10%, configurable) stand-alone; 50 / 60 Hz (±2.5 Hz)²

Battery

600 to 900 V DC; 864 A maximum DC current at 500 kVA with one string, 216 A per branch with four strings, 108 A per branch with eight²

Communication

RS-485, CAN and Ethernet; EMS on Modbus RTU (default) or Modbus TCP/IP, compatible with SunSpec/MESA; BMS on CAN by default¹

EMS timing

Modbus data queries more than 500 ms apart; regular parameter and command interval more than 1 s¹

Serial settings

Modbus address 1 to 247; RTU baud rate 19200 or 9600¹

Enclosure and environment

IP20 / NEMA 1 cabinet, optional IP54 outdoor cabinet; -20 to 50 °C with derating above 45 °C; 0 to 95% humidity, non-condensing; 3,000 m; 1100 x 2160 x 800 mm^2, 3

Certification

EX: CE LVD IEC 62477, CE EMC IEC 61000, EN 50549-1 and -2, G99, AS4777.2:2020, VDE 4110, Synergrid listing; NA: ETL listed to UL 1741, FCC, IEEE 1547, CSA 22.2, CPUC Rule 21 and HECO Rule 14^2, 3

Interface

Documented measurements and integration boundaries for PWS1-500KTL.

• Sinexcel's public documents give no register addresses. Take addresses, function codes, data types, scales and word order from Sinexcel's PCS communication protocol for the installed firmware, and ask which SunSpec or MESA models it serves.
• The touch screen AC Info page shows per-phase voltage, current, P, Q, S and PF, total P, Q and S, frequency, and charged and discharged energy in kWh. Use these as the reference set when choosing points from the protocol document, and compare each one with the page.
• The DC Info page shows DC voltage, current, power, status, warning, switch state and bus voltage. On 8M4 and 8M8 cabinets, read each battery string separately.
• The Status page shows the version and status of each AC and DC module; read the operating state and active warnings so a stopped module is not reported as zero power.
• BMS values come over CAN through the PCS and vary by battery brand. Read them only where the protocol document maps them, and keep the BMS as the authority on cell data.
• Smart meters, air conditioning, fire fighting, water level and diesel generators connect to the external EMS, not to the PCS. Read them from their own devices or the EMS.
• No active power, reactive power, power factor, DC current, DC power or start and stop setpoint is read back into control. Writes stay with the site EMS.

Setup

1. Record the cabinet and its controller

   Read the type label for the full model code, including module count and string variant. Record the PCS firmware, the battery and BMS brand, and the EMS that controls the PCS and which port it uses.

2. Obtain the protocol document

   Ask Sinexcel or the system integrator for the PWS1-500KTL Modbus communication protocol that matches the installed firmware. Ask which SunSpec or MESA models it implements and at which base address, and whether the Ethernet port accepts a second Modbus TCP client alongside the EMS.

3. Choose a port that does not disturb the EMS

   If the EMS uses the RS-485 terminals, connect Edge to the Ethernet port, which needs a fixed IP address set under Setting, Advanced, HMI. If neither port is free, fit an EpiSensor ZEM on the AC feeder instead.

4. Read status and total power first

   Configure the operating status, total active power and frequency points from the protocol document, poll at intervals longer than 500 ms, and compare them with the AC Info page on the touch screen. Then add per-phase values, energy counters and DC values.

5. Confirm direction and energy

   Check the sign of total active power and DC current during an existing charge and an existing discharge scheduled by the EMS. Compare the charged and discharged energy counters with the AC Info page over a full cycle.

Common questions

Does the Sinexcel PWS1-500KTL support Modbus?

Yes. The manual states that the PCS supports Modbus over RS-485 and Ethernet, with Modbus RTU on RS-485 as the default EMS link and Modbus TCP/IP on the touch screen's Ethernet port.¹

Where is the PWS1-500KTL register map?

It is not on Sinexcel's public download page, which carries the manual and datasheets. Ask Sinexcel or the integrator for the PCS communication protocol for the installed firmware; the manual describes it as compatible with SunSpec and MESA.^1, 3

Can Edge share the RS-485 port with the site EMS?

No. RS-485 Modbus RTU has a single master, and the manual makes it the EMS's default link. Use the Ethernet port, data from the EMS, or an EpiSensor ZEM on the AC feeder.¹

Does the PCS read the site meter?

No. The manual lists the smart meter, air conditioning, fire fighting, water level gauge and diesel generators as connected through the external EMS, not the PCS.¹