With the popularity of electric vehicles, the demand for home EV chargers has surged. Among the many charging solution options, 7kw EV charger have become the absolute main force in the current home market due to their balance. Why is this? This article will deeply analyze what a 7kw EV home charger is, what its advantages are, and its installation points.
An EV 7kw charger refers to an AC charging device for electric vehicles with a rated power of 7 kilowatts. It converts the household's 220V AC power into DC power, and then charges the electric vehicle battery because electric vehicle charging must be completed in a DC state.
Application Scenario: Mainly used for home nighttime charging, and also commonly used in some office buildings, hotels, and other places with long parking times.
The working current of an EV charger 7kw is about 32 amps. Formula: Power = Voltage × Current, P = U × I, 7000W/220V≈31.82A, take the standard specification 32A. This is calculated under the condition of single-phase AC 220V. If it is three-phase electricity, the current will be different.
Different brands and models of electric vehicles have different battery capacities. I will take the common household electric vehicle BYD Seal as an example.
Let me first talk about the basic calculation logic. Charging time = battery available capacity (kWh) ÷ charging power (kW) × conversion efficiency coefficient (Usually between 0.9-0.95) + trickle charging time (terminal slow charging protection battery).
BYD Seal reference data: Take the 61.4 kWh battery version as an example. In order to know the longest time, I temporarily take the conversion efficiency coefficient as 0.9. Therefore, the theoretical time calculation is about 61.4 kWh ÷ 7 kW × 0.9 ≈ 9.75 hours.
Of course, the actual charging time must be shorter than this. On the one hand, the conversion efficiency coefficient of the TKT® EV 7kW charger is 0.94. The reason why we did not pursue 0.95 is that the extreme pursuit will lead to a significant increase in costs. From the perspective of actual electricity savings, it is not cost-effective. On the other hand, we won't actually drain the batteries in our electric cars.
In summary, you will find that the 7kw EV home charger is very suitable for home use. When you get home at 7 pm and leave at 8 am, you can wake up and leave with a full charge.
Comparing the time, it is better than a 3kw electric vehicle charger. 3kw is too slow, which will cause the electric vehicle battery to be in an unsatisfactory state, thus damaging the battery.
Comparing the price, the 7kW EV charger cost is more affordable than the 11kW and 22kW chargers. And after being fully charged, it is enough to meet the daily travel needs of electric vehicles.
TKT is a large group company from China. We have been designing and manufacturing EV chargers since 2014. Our company officially became the official partner of BYD Sri Lanka in 2024, providing local car owners with an original EV 7 kW charger.
Reached cooperation with senior management of Sri Lanka headquarters, reported by mainstream paper media
Real scene of BYD Seal car owner’s villa installation, professional engineers’ wiring construction process, guidance for users’ operation, etc. Sri Lanka 7kw EV charger installation team has strong technical strength and can respond to customer needs in a timely manner. However, if it is in other countries, we cannot provide installation services. If you have very strong financial strength, as well as believe in the future market prospects of the EV Chargers, welcome to join the TKT EV charger franchise.
First of all, for the safety of you and the product and to enjoy the manufacturer's warranty, TKT strongly recommends that it be installed by professionals.
The usual steps are as follows:
1. Customers need to equip themselves with a dedicated power switch (MCB, RCCB, SPD, etc. that meets the standards) and communicate with the property to obtain permission.
2. Telephone communication before installation to ensure that the construction standards are met, and the 7kw EV charger installation team arrives at the site for electrical exploration.
3. Choose the installation location: close to the vehicle charging port, solid wall, away from flammable and explosive materials, dry and ventilated environment, avoid sun and rain (if you need to install it outdoors, please be sure to choose a charger with a high protection level. For example, TKT EV charger 7kw, IP65 protection level)
4. Wiring, wiring, and installation of the EV 7 kW charger body. (TKT provides special anti-theft screws to protect the safety of the equipment)
5. Power-on test to check the function and safety.
6. Acceptance and use: Acceptance test after installation. Guide customers on how to use the charger and safety precautions. (TKT also provides a special APP with rich functions)
7. Customer acceptance receipt.
Safety Tips: Do not modify the device by yourself or use incompatible cables and switches. The installation must meet safety requirements.
11kW EV Charger: usually requires three-phase power (such as 380V), has special requirements for power supply conditions, and is faster than 7kw AC EV charger.
22kW EV Charger: Like 11kw, it has special requirements for power supply conditions. This is the highest charging power of AC chargers.
DC Fast EV Charging Station: The charging scheme used by this type of charger is different from the previous ones. It directly completes the conversion of AC to DC in the charger. Therefore, it can achieve faster charging effects, such as 60kW, 120kW, 180kW, or even higher.
The essence of 7kw and 22kw chargers is the same, both are AC EV chargers. The difference between them is the different requirements for power supply conditions. The internal configuration is different, and the charging speed is different.
The 7kw EV home charger only needs a single-phase 220V power supply line (which can be used from the household power line).
The requirements of the 22kW EV charger are complicated and must use three-phase 380V AC and the corresponding meter, switch, and cable (usually need to apply to the power department).
The 7kW AC EV charger is the best choice for home use today. It strikes an ideal balance between charging speed, installation feasibility, cost, and grid load. TKT® chargers are technically strong and have been quality-tested and trusted by BYD, a Fortune 500 company. Therefore, it is one of the best 7kW EV charger.
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