Before you start
SEMS plans with the customer's real contract data, so ask for the documents before the site visit and enter everything in one go.
Documents to ask for
Ask for the latest electricity and network bill, the supply and buy-back contracts, the grid connection approvals for consumption, solar and battery, and the solar design with the single-line diagram.
Data to collect
| Data | Needed | Where to find it |
|---|---|---|
| Site address | Required | Bill or contract |
| Connection power (kW) | Required | Grid connection approval, bill |
| Allowed export power (kW) | Required | Connection approval for the solar plant or battery |
| Agreed power for blocks 1–5 (kW) | Required | Network bill |
| Network user group | Recommended | Network bill |
| Network power charge per block (€/kW per month) | Recommended | Network bill |
| Network energy charge per block (€/kWh) | Recommended | Network bill |
| Supplier and product | Required | Supply contract, bill |
| Dynamic price: market and supplier fee (€/MWh and/or %) | Required for dynamic contracts | Supply contract |
| Fixed price: ET or VT/MT (€/kWh) | Required for fixed contracts | Supplier price list, bill |
| Buy-back price or formula, for example market price minus a fee | Required | Buy-back contract |
| May the battery charge from the grid, and may that energy be sold back? | Required | Supply and buy-back contracts, battery connection approval |
| Solar plant power (kWp), tilt and orientation | Required | Solar plant design |
| Position of the meter at the connection point | Required | Single-line diagram |
Inverter and battery data such as capacity and power limits are read from the devices.
The answer on grid charging and resale sets the Electricity Plan switches that every strategy strictly follows.
On site
SEMS needs a readable meter at the grid connection point. Plan a path to every device: RS485 for Modbus RTU, the CAN bus where a device uses it, and the local network for Modbus TCP, MQTT, REST and OCPP. The controller also needs internet for prices, forecasts and the monitoring portal, and the site's latitude and longitude.