Meter, PV, BESS
Modbus RTU over RS485, Modbus TCP over the site network.
Solar and battery storage
Inverter, battery and meter data in one stream to your EMS.
Self-consumption and battery optimization need the meter, the PV inverter and the battery on one clock. mini-OTG reads them over Modbus RTU, Modbus TCP and qualified vendor profiles and delivers one timestamped stream to your energy-management system.
Discuss your integration
Every inverter vendor has a cloud. Your EMS needs the data itself.
Inverter and battery manufacturers route data through their own portals and APIs, each with its own rate limits, delays and terms. An EMS that optimizes across brands ends up integrating one vendor cloud after another, and still cannot act locally when those clouds are slow.
mini-OTG reads the equipment on site instead: the grid meter over P1 or HAN, inverters and batteries over RS485 or Ethernet using Modbus, and other devices through supported UDP profiles. It maps the values you need and publishes them straight to your broker or API.
Where a battery or inverter profile supports it, your platform can send setpoints back through the gateway, for example charge and discharge limits.
Interfaces and protocols
What mini-OTG connects for this application.
Product capability, not a compatibility list. We qualify exact models, firmware and profiles against your deployment.
Physical interfaces
RS485EthernetWi-FiP1 / HAN
Field protocols
Modbus RTUModbus TCPDSMRUDP broadcast
Cloud delivery
MQTTSSecure WebSocket (WSS)HTTPS / RESTYour schemaYour certificates
Direct data path
Your endpoint is the destination.
An installer configures the gateway on its local web server and enters your endpoint and credentials. Data goes straight to your platform. No mini-OTG cloud sits in between.
mini-OTG
One timestamped schema across vendors.
Your EMS
Your platform decides and sends supported setpoints back.
Questions
Frequently asked questions
01Which inverters and batteries are supported?
Devices exposing Modbus RTU or Modbus TCP, and supported UDP-based profiles, are within the product scope. Exact models, firmware versions and register maps are qualified during your evaluation before they are listed as compatible.
02Can my EMS control the battery through mini-OTG?
Yes, where the connected battery and its qualified profile support the control function. Commands go from your platform directly through the gateway to the device, with no mini-OTG cloud in between.
03Can it replace inverter vendor cloud APIs?
For the data points available locally, yes: the gateway reads them on site and delivers them to your own endpoint. Which values are available depends on the device profile, which is confirmed during the evaluation.
Other applications
One gateway across the site.
Smart meter P1 / HAN gateway
DIN-rail smart meter gateway for the P1 or HAN port (DSMR, eMUCS-P1, Modbus). Live meter data straight to your MQTTS broker, WebSocket or HTTPS API.
Dynamic EV charging
Live grid-connection data and charger state for dynamic load balancing in your CSMS or EMS. P1, Modbus, OCPP and EEBUS on one white-label gateway.
Heat pumps and HVAC
Connect heat pumps and HVAC through SG Ready, EEBUS or Modbus. Your platform monitors them and sends flexibility commands. White-label edge gateway.
Pro development platform · Design-partner evaluations
Discuss your integration →Bring the equipment list and cloud contract.
We scope an evaluation around your named devices, your endpoint and the evidence you need.