What Are Single-Phase and Three-Phase?

Single-phase (monophase) and three-phase (triphase) indicate the type of electrical connection in the installation. A single phase carries a single current line and typically offers up to 7.4 kW of power in AC charging, while three phases carry three mutually balancing lines and can therefore transfer much more power (11 or 22 kW) through the same cable. Most homes are single-phase, while workplaces and residential-complex car parks are mostly three-phase. An important point: the actual charging speed depends both on the site's phase and on the vehicle's onboard charger capacity; even with a three-phase installation, if the vehicle only accepts 11 kW the charge stays limited to 11 kW. That is why, to choose the right device and power, you need to know both the site's phase and the vehicle's capacity together. Bemis AC devices offer models suitable for both single-phase and three-phase installations. For example, a 7.4 kW device fits the installation in a single-phase detached house, while an 11 or 22 kW device in a three-phase workplace car park provides faster charging through the same cable; that is why confirming whether the installation is single-phase or three-phase before choosing a device makes the right power decision easier.