If you are comparing a myenergi Zappi with a standard 7kW home charger, the main question is not simply, “Which one charges my car fastest?”
It is whether you will benefit from the Zappi’s additional energy-management features.
For homeowners in Redhill, Reigate, Merstham, Earlswood, Nutfield, Salfords and surrounding Surrey areas, a Zappi can be particularly useful where a property has solar panels, a time-of-use electricity tariff, limited supply capacity or more than one electric vehicle.
However, it is not automatically the best-value choice for every home. This guide explains what “eco-smart” really means, what installation involves and who is most likely to benefit.
What does “eco-smart” mean on a Zappi?
A Zappi is still capable of working like a conventional charger. In FAST mode, it charges the vehicle from the grid at the available rate, subject to the vehicle, charger and electrical installation.
The difference is that it can also monitor your home’s electricity use and make decisions about when and how much power to send to the car.
ECO mode
In ECO mode, the Zappi attempts to use surplus renewable energy, such as electricity generated by your solar PV system. It adjusts the charging rate to reduce the amount of energy imported from the grid.
If your solar system is producing some surplus but not quite enough to charge the car at full power, ECO mode can combine solar energy with a small amount of grid electricity. Charging can therefore continue while minimising grid use.
ECO+ mode
ECO+ is designed for homeowners who want to charge using surplus generation wherever possible.
If your solar output falls below the level needed for charging, the Zappi can pause rather than continuing to draw electricity from the grid. When surplus energy becomes available again, charging resumes.
This is useful on bright days when solar generation varies due to passing clouds or changing household demand. It helps prevent electricity being exported to the grid when it could instead be stored in your vehicle.
Solar self-consumption
The Zappi uses a CT clamp to monitor energy flowing into and out of the property. It can then divert spare solar generation to the EV rather than allowing that electricity to be exported.
That does not mean every charge will be completely solar-powered. Your results depend on:
- The size and orientation of your solar PV system.
- Weather and daylight hours.
- Your household’s electricity demand.
- How long the car is connected.
- Whether the car needs charging immediately.
For homes in Redhill and Reigate with south-facing or suitable roof space, this can be a meaningful advantage. Solar PV is common across Surrey, but the best results come when the vehicle is at home during the day and can remain connected for several hours.
Grid limits and load balancing
A Zappi can be configured with a Grid Limit, restricting the maximum amount of power it imports from the grid. It can also use load balancing to reduce its charging rate when other appliances are using significant power.
For example, if the oven, electric shower and heat pump are operating at the same time, the charger can reduce its output rather than contributing to an excessive demand on the property’s supply.
This feature can be important in Surrey properties with older electrical supplies, 60A cut-outs, long cable runs to garages or limited capacity at the main consumer unit. Load management does not remove the need for a proper supply assessment, but it can form part of a sensible design.
Scheduled off-peak charging
The Zappi can schedule charging for cheaper overnight periods. This may be useful with Octopus Intelligent Go-style tariffs or other time-of-use tariffs, although the exact tariff compatibility and control method should be checked before installation.
You may be able to:
- Schedule a regular overnight charging window.
- Set a manual boost when you need additional range.
- Use smart charging settings through the myenergi app.
- Combine a scheduled boost with solar or other home-energy features.
Remember that the cheapest tariff is not necessarily the same as the greenest charging option. ECO+ may prioritise surplus solar, while a scheduled boost may prioritise a cheaper grid period.
Built-in PEN fault protection
Many modern Zappi models include built-in protection against an open PEN fault on a PME or TN-C-S supply. This is one reason an additional earth rod is not required in many standard installations.
If the Zappi detects a potentially dangerous PEN fault, it can disconnect the charging supply. The installer must still confirm that the specific charger model, earthing arrangement and installation design comply with current requirements, including BS 7671 Section 722.
An earth rod may still be needed where:
- The charger does not provide suitable built-in protection.
- The manufacturer’s instructions require another arrangement.
- The property has an unusual earthing system.
- The installation includes additional equipment or specific DNO requirements.
- Testing identifies that a TT arrangement is the appropriate solution.
The Zappi also includes internal surge protection features, but a separate surge protection device may still be required as part of the electrical installation.
Why this matters specifically in Surrey
A home charging point in Surrey is not always a simple matter of mounting a unit on the nearest wall.
Many properties in Redhill, Reigate and neighbouring areas have:
- Older 60A, 80A or 100A supplies.
- Consumer units located inside the house while the parking space is at the front or side.
- Detached garages requiring long cable routes.
- Driveways with limited access for cable installation.
- Looped or shared electricity supplies, particularly in some older terraces and semi-detached homes.
A looped supply means that two properties may share part of the incoming electricity service. A sustained 7kW EV load can require DNO involvement before the charger is connected. In much of Surrey, this may involve UK Power Networks processes.
An electrician will need to establish the cut-out rating, maximum demand, supply arrangement and whether the service is looped. If the property has a 60A supply, the proposed charger may need load management or DNO approval depending on the calculated demand.
What does a Zappi installation involve?
A professional EV charger installation normally includes the following stages.
1. Supply and site assessment
The electrician checks the incoming supply, main fuse, earthing arrangement, consumer unit and available capacity. They will also consider whether the supply is TN-S, TN-C-S/PME or TT.
2. Consumer unit and RCD checks
The EV circuit needs suitable protection, including appropriate RCD or RCBO arrangements and, where required, surge protection. If the existing consumer unit is outdated or has no suitable capacity, an upgrade or dedicated small consumer unit may be recommended.
3. Cable route planning
The cable may run internally, externally, through a loft space, along a side passage or to a detached garage. The route must be mechanically protected and installed in a way that is safe, neat and appropriate for the property.
4. Charger configuration
The installer sets up the charger, CT clamp, Wi-Fi or Ethernet connection, grid limit and load-management settings. They can also help you understand ECO, ECO+ and scheduled charging.
5. Testing, certification and notification
The completed installation must be tested and certified. The DNO may need to be notified, or prior approval may be required before work begins where the supply is looped or capacity is limited.
A straightforward installation may be completed in a few hours, but cable access, consumer unit work, earth electrodes and DNO requirements can affect the timeframe.
7kW or 22kW: which Zappi do you need?
For most Surrey homes, a 7kW single-phase Zappi is the practical choice. It suits typical domestic supplies and is compatible with the maximum charging rate of many home EVs.
A 22kW Zappi requires a suitable three-phase supply and a vehicle capable of accepting 22kW AC charging. It is more commonly relevant to workplaces, commercial premises or properties with three-phase power.
Installing a 22kW charger does not make a vehicle charge at 22kW if the car can only accept 7kW or 11kW. A supply upgrade may also be expensive or unavailable, so it should not be assumed that 22kW is automatically better.
Tethered or untethered?
A tethered Zappi has a permanently attached Type 2 cable. It is convenient because the cable is always available, but it needs somewhere tidy and secure to hang.
An untethered model has a Type 2 socket, so you use the cable supplied with your vehicle. It gives a cleaner appearance and can be more flexible if different vehicles use the same charger, but you must remember to keep the cable accessible.
Is the Zappi premium price justified?
Myenergi lists the Zappi range from around £779 including VAT at the time of writing, before installation and any additional electrical work. Prices and configurations can change.
The premium over a basic 7kW charger is most likely to be worthwhile if you:
- Have solar PV and want to increase self-consumption.
- Drive a high annual mileage.
- Use an off-peak or time-of-use tariff.
- Have two EVs or expect to add another.
- Need load balancing because household demand is high.
- Want one system to work with solar, batteries and smart scheduling.
A simpler charger may be adequate if you:
- Drive relatively few miles.
- Have no solar PV.
- Use a flat-rate electricity tariff.
- Charge infrequently and do not need scheduling.
- Live in a flat or communal property where a private home charger is not practical.
Homeowners should also check grant availability carefully. Some government-supported schemes focus on eligible renters, landlords, flats, workplaces or other specific property types. Homeowner support can change, so do not base the decision on a grant unless your eligibility has been confirmed.
Our honest verdict
A Zappi is not just a more expensive 7kW charger. Its value comes from controlling how and when your EV uses electricity.
For a solar-equipped home in Reigate, a high-mileage driver in Redhill or a household using an off-peak tariff, the additional features can justify the premium. For a low-mileage driver with no solar and no time-of-use tariff, a reliable standard smart charger may be better value.
The installation design matters just as much as the product. ADS Electrical checks the supply, earthing, consumer unit, cable route and DNO requirements before recommending a solution.
If you need advice from electric car charger installers Surrey, contact ADS Electrical on 07870554498 or email [email protected]. We are a NICEIC Approved Contractor providing free quotes within 24 hours, reliable communication throughout the project and coordination with other trades where required.
We also offer 24-hour emergency call-outs and free lighting design consultations as part of our wider domestic, commercial and industrial electrical services.