After "which EV should I buy?", the next most common question for new EV owners in Saudi Arabia is: which home charger do I need — 7, 11, or 22 kW?
The right choice isn't about price or speed alone. It depends on three measurable factors:
- Your car's onboard charger limit (OBC)
- Your home's electricity supply (single-phase or three-phase)
- Your daily usage pattern
This guide breaks down the three factors with concrete numbers so you can choose the right kW rating before installation — not after.
How is charger kW calculated?
Kilowatt (kW) = electrical energy delivered per unit of time. The formula is simple:
Power (kW) = Voltage (V) × Current (A) ÷ 1000
For single-phase electricity:
- 7 kW = 220V × 32A ≈ 7,040 watts
- 3.7 kW = 220V × 16A (slow home charger)
For three-phase at 400V:
- 11 kW = 400V × 16A × √3 ≈ 11,085 watts
- 22 kW = 400V × 32A × √3 ≈ 22,170 watts
In practice, you only get the full rated power if two conditions are met:
- Your home electricity supports the load (single-phase for 7 kW, three-phase for 11 and 22 kW)
- Your car can accept that input rate (Onboard Charger)
Onboard charger limits — the practical table
Every EV has an Onboard Charger (OBC) that converts AC from your home charger into DC for the battery. The conversion rate sets the maximum AC speed your car can accept, regardless of what you plug into.
OBC ratings for popular EVs in Saudi Arabia (per manufacturer documentation):
- 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
Practical takeaway: install a 22 kW charger at home with a Tesla Model Y, and the car still tops out at 11 kW. The extra capacity is wasted.
After choosing the right charger size, the next consideration is total installed cost. EVS Service Center has published a real installed cost in Saudi Arabia breakdown covering 7 kW, 11 kW, and 22 kW pricing with SEC permit fees and wiring work included.
Home electricity: single-phase vs three-phase
Saudi Arabia is in a transition period for residential voltage. Per Council of Ministers Resolution No. 324 (1431H), the Kingdom is gradually moving from 127/220V to the international 230/400V standard over 25 years (10 preparatory + 15 implementation). Saudi Electricity Company (SEC) rolls out the change region by region.
In today's reality:
- Older villas (roughly pre-2010): often a mix of 127V and 220V circuits. EV charger installation usually requires partial panel upgrades.
- Newer villas: typically 230V single-phase or 400V three-phase.
- Larger buildings (apartments, premium villas): commonly have three-phase.
How to know your home's setup: check your main distribution panel:
- Main breaker with three side-by-side poles = three-phase available
- Main breaker with one wide pole = single-phase only
Or have a certified electrician read your SEC bill and meter panel.
7 kW charger — details
How it works: AC single-phase, 32 amps at 220V.
Pick it if:
- Your home is single-phase only (no three-phase available)
- Your car's OBC is 7 kW or less (e.g. base BYD Atto 3)
- You charge overnight (8+ hours available)
- Your daily driving averages under 80 km
Drawbacks:
- Slow for cars with large batteries (90+ kWh)
- Doesn't suit drivers needing fast top-ups for multiple daytime trips
Installation: simplest type, usually no special SEC coordination needed. Just a dedicated circuit, 40A breaker, and appropriate cable.
11 kW charger — details
How it works: AC three-phase, 16 amps at 400V.
Pick it if:
- Your home has three-phase
- Your car's OBC is 11 kW (most common: Tesla Model 3/Y, Hyundai Ioniq 5/6, BYD Seal)
- You want the speed-vs-cost balance
- Your daily driving averages 80–150 km
This is the most balanced choice for the Saudi market: matches the OBC of most popular cars and uses three-phase without escalating to 22 kW costs.
Installation: requires three-phase + 20A circuit per phase + roughly 5×4 mm² cable. Usually no special SEC coordination for mid-size villas.
22 kW charger — details
How it works: AC three-phase, 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 (e.g. Lucid Air at 19.2 kW)
- You charge multiple cars or drive long daily distances (200+ km)
- You're future-proofing — newer EVs may push OBC ratings higher over time
Drawbacks:
- Most expensive to install (thicker cable, bigger breaker, canopy)
- 22 kW installations typically require SEC coordination to confirm meter panel capacity
- Wasted on cars with OBC under 22 kW (most of the market)
Charging speed comparison (60 kWh battery)
For a 60 kWh battery (roughly Tesla Model 3 RWD or Hyundai Ioniq 5 SE), charging from 20% to 90% (= 42 kWh added):
- 7 kW charger: about 6 hours
- 11 kW charger: about 4 hours
- 22 kW charger: about 2 hours (only if the car actually accepts 22 kW)
⚠️ These are ideal numbers. Real-world adds 10–15% due to conversion loss and heat.
What if you don't have three-phase?
You have three options:
- Stick with 7 kW: simplest and cheapest. Covers most Saudi usage patterns (50–100 km/day average).
- Upgrade to three-phase: contact SEC. Cost and timeline depend on your area and proximity to a distribution substation.
- Choose an upgradable smart charger: some chargers support raising the rated power later when the home supply is upgraded.
Permitting and SEC requirements
Per 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, provided the charger carries SASO certification.
- Installations above 22 kW: require SEC coordination to confirm infrastructure capacity.
- Charger standards: SASO certification is mandatory; compatibility with IEC 62196-2 (Type 2 connector) and CCS2 for fast charging.
Selection matrix: which charger for which car?
- Tesla Model 3 / Model Y: 11 kW charger = ideal (matches OBC exactly)
- Tesla Model S / X: 11 kW charger is sufficient (historic OBC = 11 kW)
- Lucid Air: 22 kW charger = ideal (uses the 19.2 kW OBC)
- BYD Atto 3: 7 kW charger = ideal (OBC = 7.2 kW)
- BYD Seal: 11 kW charger = ideal (OBC = 11.5 kW)
- Hyundai Ioniq 5/6 / Kia EV6: 11 kW charger = ideal
- 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 considered moderate (Level 2). Battery wear concerns relate to frequent DC fast charging (40+ kW), not home AC charging.
Do I need a special cable for 22 kW?
Yes. A 22 kW charger usually needs roughly 5×6 mm² cable (depending on run length), versus 3×4 mm² for a 7 kW charger. This raises installation cost.
How many km does each charger add per hour?
- 7 kW: ~35–40 km/hour
- 11 kW: ~55–60 km/hour
- 22 kW: ~110–120 km/hour (only for cars that accept it)
Can I run the charger from a sub-panel instead of the main panel?
Technically yes, but the sub-panel must handle the load, and some installations require a dedicated residual current device (RCD type B) for protection.
What if I plan to buy a different EV in two years?
Most new EVs are converging on an 11 kW OBC. If your home has three-phase, an 11 kW charger is the safe investment. A 22 kW charger is a "future-proof" play for those expecting to buy a premium EV.
Can I install an 11 kW charger on single-phase?
No. 11 kW inherently needs three-phase. On single-phase, the realistic ceiling is 7 kW (32A at 220V).
Next step: a home assessment
Picking a charger size links your car, your home, and your future EV plans. Climatech Charger provides a home assessment that includes:
- Distribution panel inspection (single-phase vs three-phase)
- Matching charger rating to your car's OBC
- Cable run and gauge sizing
- SEC coordination if needed
- Recommendation tailored to your usage pattern
Coverage: Riyadh, Jeddah, Dammam, and Makkah. 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 — international charging power and connector standards
Note on Onboard Charger figures: numbers are taken from manufacturer documentation as published per model. Ratings vary across model years and trims. For up-to-date figures on a specific car, check the official owner's manual.
