Platform

Supported hardware and protocols

WEM's controller on site talks to most devices directly, over the site network or an RS485 line, and sends the data to the cloud over an encrypted connection. These are the devices and signals it works with.

How devices connect

On site
  • Batteries
  • Solar
  • Meters
  • EV chargers
  • Grid operator
  • Modbus TCP
  • Modbus RTU (RS485)
  • SunSpec
  • Relay contacts
WEM controller WAGO PFC200 / PFC300
  • MQTT with TLS
WEM cloud AWS Frankfurt
The controller reaches devices over Modbus TCP on the site network, Modbus RTU on an RS485 line, SunSpec on inverters that follow the standard, and relay contacts for grid operator signals. To the cloud it sends data over MQTT, encrypted with TLS. Some solar inverters can also be read by the WEM cloud straight from the manufacturer's cloud.

Devices WEM works with

The list grows with every project.

Battery storage

  • WincleWNCEL cabinets, one or severalModbus TCP
  • GotionESC-R100-211Modbus TCP
  • FENECONSystems with FEMS and the Modbus/TCP write access appModbus TCP
  • IntilionscaleblocModbus TCP
  • JinkoSunGiga G2Modbus TCP
  • TeslaBattery storage systemsModbus TCP
  • CNTEBattery storage systemsModbus TCP
  • HiTHIUM∞Block and ∞Power cabinetsModbus TCP
  • SolisS6-EH3P hybrid inverters (60 to 125 kW), battery and solar sideModbus TCP

Solar

  • KACOblueplanet and Powador invertersSunSpec over Modbus TCP
  • HuaweiSUN2000 KTL-M3 inverters (15 to 50 kW)Modbus TCP
  • GoodWePV invertersModbus TCP
  • SMAPV invertersManufacturer cloud API
  • SMAData Manager M plant controllerModbus TCP
  • SolarEdgePV invertersModbus TCP or cloud API
  • SungrowPV invertersManufacturer cloud API

Meters

  • JanitzaUMG 604Modbus TCP
  • SiemensSENTRON PAC3220 and PAC2200Modbus TCP
  • SiemensSENTRON PAC3120Modbus RTU (RS485)
  • ChintDTSU666Modbus RTU (RS485)
  • AcrelDTSD1352Modbus RTU (RS485)
  • SatecPM130Modbus TCP

EV charging

  • ElliFlexpoleModbus TCP

Grid operator signals

  • Ripple-control receiverPower limits from the grid operatorRelay contacts
  • § 14a control boxLimits on charging under § 14a EnWGRelay contacts

WEM controller

  • WAGOPFC200 and PFC300MQTT with TLS to the cloud

Not on the list yet?

SunSpec inverters

SunSpec Alliance

SunSpec is the open Modbus standard that most solar inverter makers support. WEM's SunSpec driver finds a device's data when it connects, so a new SunSpec inverter usually needs no new driver, only a check on our test bench. WEM is a member of the SunSpec Alliance.

Other Modbus devices

Batteries, meters and chargers with a Modbus interface can usually be added. We write the driver from the manufacturer's register documentation and test it on our test bench before it controls anything on a site.

What we need to check a device

  • Make and model
  • Firmware version
  • How it connects: Ethernet or RS485
  • The Modbus register document, if you have it

Common questions

Do I have to replace my existing equipment?

Usually not. WEM's controller connects to the batteries, inverters and meters already on site: the ones on this list, and most others with a Modbus or SunSpec interface. The battery's own management system stays in charge of cell safety; WEM tells the battery system how much to charge or discharge.

What happens if the internet connection drops?

The controller keeps the site within its safety limits on its own and reconnects to the cloud when the connection is back.

Where is the data stored?

In Germany, at AWS in Frankfurt (eu-central-1). The controller sends it over an encrypted MQTT connection.

Which devices are on your site?

Send us the list with make and model, and we will tell you how WEM connects to each one.

Contact us