After "which EV should I buy?", new EV owners in Saudi Arabia most often ask: which home charger do I need, 7, 11 or 22 kW?
Price and speed are only part of the answer. The choice depends on three things you can measure:
- Your car's onboard charger limit, or OBC
- Your home's electricity supply, single-phase or three-phase
- Your daily usage pattern
This guide goes through each factor with real numbers, so you can choose the right kW rating before installation, not after.
How is charger kW calculated?
A kilowatt (kW) measures how much electrical energy is delivered per unit of time. The formula is:
Power (kW) = Voltage (V) × Current (A) ÷ 1000
For single-phase electricity:
- 7 kW = 220V × 32A ≈ 7,040 watts
- 3.7 kW = 220V × 16A, a slow home charger
For three-phase at 400V:
- 11 kW = 400V × 16A × √3 ≈ 11,085 watts
- 22 kW = 400V × 32A × √3 ≈ 22,170 watts
You only get the full rated power if two conditions are met:
- Your home supply can carry the load: single-phase for 7 kW, three-phase for 11 and 22 kW
- Your car's onboard charger can accept that rate
Onboard charger limits: the practical table
Every EV has an onboard charger, or OBC, that converts AC from your home charger into DC for the battery. Its rating caps the AC speed your car accepts, whatever charger you use.
OBC ratings for popular EVs in Saudi Arabia, from manufacturer documents:
- Tesla Model 3: 11 kW AC
- Tesla Model Y: 11 kW AC
- Lucid Air: 19.2 kW AC
- BYD Atto 3: 7.2 kW AC, 32A at 240V
- BYD Seal: 11.5 kW AC, 48A
- Hyundai Ioniq 5: 11 kW AC
- Hyundai Ioniq 6: 11 kW AC
In practice: if you install a 22 kW charger at home and drive a Tesla Model Y, the car still charges at 11 kW at most. You pay for capacity you cannot use.
Once you know the charger size, the next question is the total installed cost. EVS Service Center has published a real installed cost in Saudi Arabia breakdown with 7 kW, 11 kW and 22 kW prices, including SEC permit fees and wiring work.
Home electricity: single-phase vs three-phase
Residential voltage in Saudi Arabia is changing. Under Council of Ministers Resolution No. 324 of 1431H, the Kingdom is moving from 127/220V to the international 230/400V standard over 25 years, 10 of preparation and 15 of implementation. The Saudi Electricity Company (SEC) is making the change one region at a time.
Today, this is what you usually find:
- Older villas, built before about 2010: often a mix of 127V and 220V circuits. An EV charger usually needs a partial panel upgrade.
- Newer villas: typically 230V single-phase or 400V three-phase.
- Larger buildings such as apartments and premium villas: three-phase is common.
How to check your home's supply. Look at your main distribution panel:
- A main breaker with three poles side by side means three-phase is available
- A main breaker with one wide pole means single-phase only
You can also ask a certified electrician to read your SEC bill and meter panel.
7 kW charger: details
How it works: single-phase AC, 32 amps at 220V.
Pick it if:
- Your home has single-phase only
- Your car's OBC is 7 kW or less, as on the base BYD Atto 3
- You charge overnight for 8 hours or more
- You drive less than 80 km a day on average
Drawbacks:
- Slow for cars with large batteries of 90 kWh or more
- Not a good fit if you need quick top-ups between several daytime trips
Installation: the simplest type, and usually no special SEC coordination. You need a dedicated circuit, a 40A breaker and the right cable.
11 kW charger: details
How it works: three-phase AC, 16 amps at 400V.
Pick it if:
- Your home has three-phase
- Your car's OBC is 11 kW, the most common rating, as on the Tesla Model 3 and Y, Hyundai Ioniq 5 and 6, and BYD Seal
- You want a balance between speed and cost
- You drive 80 to 150 km a day on average
For most buyers in Saudi Arabia, this is the best balance: it matches the OBC of most popular cars and uses three-phase without the cost of a 22 kW installation.
Installation: needs three-phase, a 20A circuit per phase and roughly 5×4 mm² cable. Mid-size villas usually need no special SEC coordination.
22 kW charger: details
How it works: three-phase AC, 32 amps at 400V.
Pick it if:
- Your home has three-phase and the panel can handle the extra load
- Your car's OBC is 22 kW or close to it, like the Lucid Air at 19.2 kW
- You charge several cars or drive 200 km or more every day
- You are planning ahead, since newer EVs may come with higher OBC ratings
Drawbacks:
- The most expensive to install, with a thicker cable, bigger breaker and canopy
- 22 kW installations typically require SEC coordination to confirm meter panel capacity
- Wasted on cars with an OBC under 22 kW, which is most of the market
Charging speed comparison for a 60 kWh battery
A 60 kWh battery, about the size in a Tesla Model 3 RWD or Hyundai Ioniq 5 SE, needs 42 kWh to charge from 20% to 90%:
- 7 kW charger: about 6 hours
- 11 kW charger: about 4 hours
- 22 kW charger: about 2 hours, only if the car accepts 22 kW
These are ideal figures. In practice, conversion loss and heat add 10 to 15%.
What if you don't have three-phase?
You have three options:
- Stay with 7 kW: the simplest and cheapest option. It covers the typical Saudi average of 50 to 100 km a day.
- Upgrade to three-phase: contact SEC. Cost and timeline depend on your area and how close you are to a distribution substation.
- Choose a smart charger you can upgrade: some chargers let you raise the rated power later, once the home supply is upgraded.
Permitting and SEC requirements
According to the technical requirements published by the Ministry of Municipal, Rural Affairs and Housing (MOMRAH):
- Installations up to 22 kW: usually fit within existing meter capacity, as long as the charger has SASO certification.
- Installations above 22 kW: need SEC coordination to confirm the infrastructure can take the load.
- Charger standards: SASO certification is mandatory, and the charger must support the IEC 62196-2 Type 2 connector and CCS2 for fast charging.
Selection matrix: which charger for which car?
- Tesla Model 3 / Model Y: an 11 kW charger matches the OBC
- Tesla Model S / X: an 11 kW charger is enough, since the OBC is 11 kW
- Lucid Air: a 22 kW charger is the best match, to use the full 19.2 kW OBC
- BYD Atto 3: a 7 kW charger is the best match for the 7.2 kW OBC
- BYD Seal: an 11 kW charger is the best match for the 11.5 kW OBC
- Hyundai Ioniq 5/6 / Kia EV6: an 11 kW charger is the best match
- Don't know your car's OBC? Check the official manual or the manufacturer's website
Frequently asked questions
Will 22 kW damage my battery?
No. AC charging up to 22 kW is moderate Level 2 charging. Battery wear comes from frequent DC fast charging at 40 kW or more, not from home AC charging.
Do I need a special cable for 22 kW?
Yes. A 22 kW charger usually needs about 5×6 mm² cable, depending on the run length, compared with 3×4 mm² for a 7 kW charger. This adds to the installation cost.
How many km does each charger add per hour?
- 7 kW: about 35 to 40 km per hour
- 11 kW: about 55 to 60 km per hour
- 22 kW: about 110 to 120 km per hour, for cars that accept it
Can I run the charger from a sub-panel instead of the main panel?
Yes, if the sub-panel can carry the load. Some installations also need a dedicated type B residual current device, or RCD.
What if I plan to buy a different EV in two years?
Most new EVs are settling on an 11 kW OBC. If your home has three-phase, an 11 kW charger is the safe choice. A 22 kW charger makes sense if you expect to buy a premium EV.
Can I install an 11 kW charger on single-phase?
No. 11 kW needs three-phase. On single-phase, the realistic limit is 7 kW, 32A at 220V.
Next step: a home assessment
The right charger size depends on your car, your home and the EVs you may buy later. Climatech Charger's home assessment includes:
- Distribution panel inspection to confirm single-phase or three-phase
- Matching charger rating to your car's OBC
- Cable run and gauge sizing
- SEC coordination if needed
- A recommendation based on how you drive
We cover Riyadh, Jeddah, Dammam and Makkah. Our local engineering team responds within 24 to 48 hours of a survey request.
Get a tailored home assessment
Official sources
- Saudi Electricity Company: voltage change plan
- SERA: Saudi Arabian Grid Code (May 2024)
- MOMRAH: technical requirements for EV charging (PDF)
- Lucid Motors: Charging Your Lucid Air
- SASO, Saudi quality certification
- IEC 61851 and IEC 62196, the international standards for charging power and connectors
Note on Onboard Charger figures: the numbers come from each manufacturer's published documents. Ratings change between model years and trims. For current figures on a specific car, check the official owner's manual.
