5 Costly Mistakes People Make When Installing EV Chargers

"What can go wrong when installing an EV charger?" — These are the five most expensive mistakes home owners and business owners make during EV charger installations. Avoid them and you'll save money, time, and headaches.

Mistake #1: Wrong Cable Sizing (Fire Risk)

Using 2.5 sq mm cable for a 7.4 kW charger that draws 32A is a fire risk. The correct specification: 6 sq mm copper for 7.4 kW (single-phase), 4 sq mm copper for 22 kW (three-phase). Cost to fix after installation: ₹5,000–₹15,000. Cost to get it right the first time: ₹0 extra.

Mistake #2: Skipping Proper Earthing (Shock Hazard)

An EV charger without proper earthing is a shock hazard. KSEB requires two independent earth pits with resistance below 5 ohms. Many DIY installations use building common earthing, which may not meet this standard. Proper earthing costs ₹3,000–₹5,000 — a tiny price for safety.

Mistake #3: No Dedicated Circuit Breaker or RCD

Your EV charger should have its own MCB and a 30 mA Type A RCD. Without these, a fault could trip your entire house or go undetected. The RCD alone costs ₹1,500–₹3,000 and could save a life.

Mistake #4: Ignoring KSEB Meter Separation

Adding an EV charger without a separate meter pushes your extra 200–300 units/month into KSEB's highest tariff slab (₹8.00/kWh above 250 units). A dedicated meter can help manage costs better. Annual savings: ₹5,000–₹12,000 depending on usage. The meter application costs ₹2,000–₹5,000.

Mistake #5: Buying Unbranded Chargers Without OCPP

Cheap chargers from unverified sellers lack BIS/IEC safety certifications, OCPP protocol support (no smart features or CMS integration), and warranty support. Invest in a certified charger from a reputable manufacturer. The ₹5,000–₹10,000 premium pays for itself in reliability.

The Common Thread

All five mistakes stem from cutting corners to save small amounts. Professional installation costs 10–15% more upfront but eliminates safety risks, reduces energy costs, and avoids expensive rework. Book a free survey and we'll do it right the first time.