A reliable power supply is essential when traveling – whether for the refrigerator, laptop, or other 230V devices in the motorhome. Many campers rely on a power station to remain flexible even without a permanent shore power connection. However, connecting a power station to the motorhome poses safety risks if the residual current device isn't functioning properly.
The WATTSTUNDE® CEE feed-in cable with FI Allows you to safely and reliably supply 230V power from your power station to your motorhome . Thanks to the integrated residual current device (RCD), it reliably protects you and your devices from fault currents and ensures a stable connection. The power station remains outside the vehicle , while you can safely use the power inside the motorhome.
Who is the WATTSTUNDE CEE feed-in cable with FI suitable for?
The WATTSTUNDE® CEE feed-in cable with FI is ideal for anyone who uses a power station and relies on a safe 230V power supply in their motorhome.
It is particularly suitable for:
- Campers who want to use their power station as the main power source in their motorhome
- Motorhome owners who want to safely feed in electricity from a power station
- Anyone who needs a reliable connection to the CEE socket without the risk of fault currents
⚠ Important note: The power station must not have an activated PEN bridge on the output (e.g. EcoFlow Delta Pro 3, where the earthing is switchable).
For power stations such as the EcoFlow Delta Pro 3, this power cable is not required as they are already designed for safe power supply.
The cable is specially designed for caravans, motorhomes and camper vans and is not suitable for boats.
Differences between shore power and power stations
Power stations and shore power grids operate with different electrical systems:
- Shore power (TN grid): A solidly grounded grid available at RV parks or campsites. Residual current devices (RCDs) operate reliably here.
-
Power station (IT network): An isolated network without a solid earthing connection. A conventional residual current device (RCD) cannot trip correctly in this network.
In an IT network, there is no solid grounding, which is why a conventional residual current device (RCD) cannot detect the difference. The CEE supply cable with RCD ensures that the protective mechanism still functions and the system shuts down reliably in the event of a fault.
This means that if you simply connect a power station to the CEE power outlet, protective mechanisms can be disabled. Fault currents then go unnoticed, which poses a potential danger.
When is there a potential danger?
A hazard arises when a fault current occurs and is not detected or switched off . This can happen in the following cases:
- Defective appliances: An insulation fault (e.g., in a coffee machine) can cause the housing to become live. Without grounding, the fault current won't flow away, resulting in an electric shock.
- Touching a live wire: If you touch a damaged wire, current can flow through your body. Since the power station is not grounded, the residual current device (RCD) is ineffective.
- Moisture or leakage currents: Water in sockets or devices can lead to uncontrolled leakage currents. In a TN system, the residual current device would trip; in an IT system, the fault current often goes unnoticed.
The CEE feed-in cable with FI ensures that the FI protection works reliably and that your power station can feed power safely into the motorhome.
How the residual current device increases your safety
A residual current device (RCD) monitors the flow of electricity and detects when electrical energy is being lost through an undesirable source—for example, through a faulty appliance or the human body. In this case, it interrupts the circuit within milliseconds, thus preventing dangerous electric shocks and potential damage.
Because a power station operates on an isolated IT network , a standard residual current device (RCD) typically cannot trip. The WATTSTUNDE CEE input cable with RCD solves this problem by adapting the power station's network structure so that the RCD protection functions correctly.
This gives you the same level of security as when using regular shore power.
Simple and safe application
The WATTSTUNDE CEE feed-in cable with FI has been designed to be quick and easy to use:
- Connecting the power station: Connect the Schuko end (male) to the socket of your power station.
- Use CEE socket: Plug the other end (female) into the CEE feed-in socket of your motorhome.
- Activate residual current protection: The integrated residual current circuit breaker now ensures that fault currents are detected and switched off.
Important:
✅ Only use with a power station!
❌ Do not connect the power station to shore power at the same time!
Why? Because shore power uses a fixed earthing system (TN grid), while the power station uses an isolated grid (IT). Simultaneous connection can lead to problems with the protective shutdown. If both grids are connected simultaneously, the earth potential difference create uncontrolled currents between the two systems. These can lead to:
- the residual current device of the shore power trips unexpectedly because it measures unexpected currents.
- the FI of the power station is not working correctly because the IT network has no solid earthing and therefore fault currents are not detected properly.
Why the power station should be operated outside the motorhome
.webp)
For safety reasons, we recommend operating the power station outside the motorhome . This minimizes the risk of exposed electrical contacts and ensures safe residual current shutdown.
Anyone who still wants to use the power station indoors must take additional protective measures and contact a qualified electrician .
Always have safety-relevant installations carried out by a professional to avoid risks!
Use of a power station with solar charging
A power station can be charged with solar power while feeding power into the motorhome. This is especially useful for remaining less dependent on external power sources while on the road.
But be careful: The power station must not be connected to shore power at the same time!
With a combination of power station, CEE feed-in cable with FI and solar charging, you have a flexible and safe power solution for your motorhome.
12V vs. 230V systems in motorhomes
Many motorhomes use both 12V and 230V power systems . But what are the differences, and how can a power station be safely integrated into the motorhome?
12V systems – safe, but limited
- Work directly via the on-board battery
- Ideal for LED lighting, USB devices and small consumers
- No residual current device necessary as there is no dangerously high voltage
12V systems are energy efficient and safe, but are not sufficient for many devices.
230V systems – More comfort, but with safety requirements
- Required for household appliances such as coffee machines, laptops or microwaves
- Can be powered by shore power or a power station
- FI protection is mandatory for safe feeding into the motorhome
How does the power station fit into the motorhome's electrical system?
If you want to use a power station as a 230V source , you can use the WATTSTUNDE CEE feed-in cable with FI to the CEE power socket of your motorhome. The cable ensures that the Safety mechanisms function correctly and the feed-in is carried out safely according to VDE standards .
- Without the correct supply cable, there is a risk that the residual current device will not trip and fault currents will go unnoticed.
- The WATTSTUNDE CEE feed-in cable with FI activates the residual current protection so that your motorhome can be operated safely as if it were on shore power.
Anyone who wants to use 230V from a power station in their motorhome should rely on a safe power supply. The WATTSTUNDE CEE power cable with residual current device ensures that fault currents are detected and switched off, ensuring your motorhome is supplied with 230V safely and in accordance with standards.
Which power stations are suitable for the WATTSTUNDE CEE feed-in cable with FI?
.webp)
The WATTSTUNDE CEE power cable with residual current device (RCD) is compatible with most common power stations with a Schuko outlet . It's important that the power station delivers a clean sine wave and is designed for operation with 230V devices.
Power stations from manufacturers such as:
- EcoFlow
- Jackery
- Bluetti
- anchor
These brands offer reliable power stations with sufficient power to feed into your motorhome. Important: The power station must have a Schuko socket (EU plug, 230V output, 50 Hz) to connect the power cable.
The cable is not suitable for power stations with pure DC outputs (12V/USB) or special US sockets. If you are unsure whether your power station is compatible, check the technical specifications or contact the manufacturer directly.
Safe feeding with the right technology
The WATTSTUNDE CEE feed-in cable with FI offers you a simple, safe and standard-compliant way to feed power from a power station into your motorhome.
- Safe supply of 230V from a power station
- Residual current circuit breaker provides protection against fault currents
- Easy to use without any modifications to the motorhome
- For motorhomes and caravans
Anyone who wants to operate a power station in their motorhome should rely on a secure power supply – with the CEE feed-in cable with FI from WATTSTUNDE.
