This guide is aimed at installers who plan and install charging infrastructure in PV projects — from a single wallbox to load management at a commercial site.
AC or DC charging station: what should installers plan for?
An AC charging station charges with alternating current (typically 11 or 22 kW); the vehicle handles the conversion. A DC charging station converts the current in the station and charges directly with DC — for much higher charging power. For most residential and commercial projects you plan AC; DC is worthwhile for short dwell times and high throughput.
How do I size the charging power for a project?
The right charging power follows from vehicles, dwell times and the available grid connection. Rule of thumb: the sum of charging powers must not exceed the grid connection — without load management, the grid connection limits the number of simultaneous charging points.
- Number & type of vehicles
- Dwell times (long = AC suffices, short = DC)
- Grid connection capacity at the site
- Coupling with PV & storage (surplus charging)
What is dynamic load management — and why is it decisive in commercial settings?
Dynamic load management intelligently distributes the available connection capacity across multiple charging points and prevents overloading the grid connection. In commercial settings it is usually the prerequisite for operating several wallboxes without an expensive grid-connection upgrade.
How do I combine wallbox, PV and storage (PV surplus charging)?
With PV surplus charging, the vehicle is charged preferentially with surplus solar power. In an integrated system, the energy management controls wallbox, PV and storage together — maximising self-consumption and minimising grid draw. The prerequisite is a coordinated system of inverter, storage and wallbox.
Which charging solutions does PVSelected carry?
PVSelected carries charging solutions that integrate into PV and storage systems. Sigenergy offers AC wallboxes at 7, 11 and 22 kW (Type 2) and DC fast chargers at 12 and 25 kW (CCS2), integrated into load management; complemented by wallbox solutions from SOFAR Solar.
What should installers consider when selecting?
- Load management — dynamic and expandable
- Connector type — Type 2 (AC) or CCS2 (DC)
- System integration — PV surplus charging with inverter & storage
- Interfaces — e.g. OCPP for billing/control
- Check funding and calibration-law (Eichrecht) requirements per project
Frequently asked questions about charging infrastructure
Does PVSelected also supply wallboxes to end customers?
No — to installers and trade partners (B2B) only.
Can the wallboxes be coupled with PV and storage?
Yes — in the Sigenergy system, wallbox, inverter and storage are integrated via shared load management (PV surplus charging).