Emergency power supply with photovoltaics: How to stay powered up during a power outage

What does emergency power for PV systems actually mean in everyday business life? Normally, a PV system simply switches off in the event of a power failure—that is standard practice. With an emergency power function, however, things are different: the power storage system kicks in and continues to supply central devices, even when no solar power is being produced. This means that servers, communication systems, and other business-critical devices remain reliably operational even during a blackout. Without this function, you risk unnecessary downtime and productivity losses in an emergency.

To professionally implement an emergency power supply via photovoltaics, you essentially need two components: a modern hybrid inverter and a suitable power storage unit. In the event of a power failure, the system reliably disconnects your building from the public grid and supplies defined consumers from the battery – until it is discharged. There are basically two approaches here: Either you opt for a separate emergency power outlet to which you connect specific important devices such as routers or refrigerators. Or you choose a more comprehensive backup power solution that automatically keeps most of your household appliances running. However, this option requires increased installation work in the distribution box, which is ideally carried out by a specialist company.

Emergency power and backup power

Emergency power photovoltaics – this means that there is a special socket, usually near the inverter. In an emergency, important devices such as cell phone chargers or refrigerators can be connected to this socket. The switchover is manual, which is quite straightforward, but limited to individual devices.

Replacement power is much more convenient. Here, selected circuits in the house are set up in advance. In the event of a power failure, the hybrid inverter automatically takes over and, depending on the planning, continues to supply either the entire household or a larger selection of devices with power. This not only offers more flexibility, but also ensures an uninterrupted supply to critical consumers.

Requirements

1. Hybrid inverter with emergency power function:
   This device detects a power failure in the PV system, safely disconnects the house from the public grid, and automatically switches to emergency power mode. Without a suitable inverter, an uninterruptible power supply is not possible.
2. Battery storage:
   An electricity storage system is essential to ensure that energy is actually available in the event of a power failure—especially at night or in unfavorable weather conditions. Without storage, the emergency power supply simply does not work.
3. Preparation for emergency or backup power:
   For a simple emergency power outlet, it is sufficient to connect an outlet to the inverter. If, on the other hand, a more comprehensive backup power solution is to be used, selected circuits in the distribution box must be specially prepared and fused for the emergency power supply in advance. Careful planning is crucial here.

When it comes to emergency power supplies, there are a few key points to keep in mind:

Firstly, the available power is limited. Devices with high power requirements or high inrush currents—such as instantaneous water heaters or washing machines—are usually not a good idea for connection to an emergency power solution. This quickly pushes the system to its limits.

Power storage capacity is the next issue. The storage capacity must be large enough to cover basic consumption and enable the desired runtime in the emergency power-capable inverter. This is the only way to ensure reliable protection.

And don't forget: safety. A well-designed emergency power supply increases operational reliability and makes you less dependent on external power sources – a clear advantage, especially given the increasing uncertainties in the power grid.

„Secure your home with an emergency power supply. Ask us how.“

This article is intended for informational purposes only and does not constitute a binding offer or professional advice.