Ghat driving with an EV — Western Ghats and hill climbs

Charge to 85–95% in the last city before the ghat — Pune before Lonavala, Mysore before Ooty, Kochi before Munnar.

Enable Adjust for hills & weather on EV Grids. Set reserve SOC to at least 25% (30% in May–September on Western Ghats routes).

Pick a backup charger on both sides of the pass in case the primary is busy or offline.

Drive smoothly — aggressive acceleration on climbs drains the pack fast. Regen helps on descents but rarely offsets the climb.

In monsoon, allow extra time; wet roads and landslide holds mean you may arrive at the next charger with less SOC than planned.

If arrival SOC on the planner looks tight (under 25%), stop earlier on the plains side rather than pushing through the pass.

Use Plan with seasonal settings on corridor pages during May–September for auto-filled reserve SOC and hills adjustment.

You will spend more energy going up than you recover coming down. Plan the climb as a one-way tax. Charge to 90%+ on the plains side (Pune, Mysore, Kochi, Panvel) and keep 25–30% reserve until you are over the pass.

Hairpin traffic in monsoon can turn a 40-minute ghat into two hours of creep with AC on. If the planner arrival at the far side is 22%, stop earlier. Dead cars on ghat shoulders are not a personality trait.

Mumbai–Pune is short enough to be a lesson. Pune–Goa and Hyderabad–Goa are the exam. Mysore–Ooty and Kochi–Munnar are steep and have weak destination DC — treat them as climb-and-return, not as ‘charge in the hill station’.

Climbing converts battery energy into height, and regenerative braking on the way down returns only part of it — the rest is lost to heat, rolling resistance and air. Treat a ghat section as a net energy cost, never as something that balances out.

The practical consequence is where you charge, not how you drive. Fill up on the plains side of a climb rather than hunting for a charger in a hill town, where sites are fewer, slower, and more likely to be occupied.

Use the strongest regenerative setting the car offers and stay off the friction brakes where it is safe, both to recover energy and to avoid brake fade on a long descent. Expect the state of charge to climb, sometimes enough to matter for the next leg.

A caveat that catches people out: a nearly full battery cannot accept much regeneration. Arriving at the top of a long descent at 100% means the car will limit regen and rely on friction braking instead. Arriving in the 80s is both safer and more efficient.

Western Ghats toward Goa, the Coimbatore–Salem rises, and Himalayan approaches all punish the same mistake: arriving at the foot of the climb at 22% because the last plains charger looked optional. Regeneration on the descent does not refund the climb you have not done yet. Fill on the plateau; treat hill-town DC as a bonus, not the plan.

Wh/km on a 4–6% grade with HVAC is not the Hyderabad ring-road figure. Raise the planner’s Wh/km or enable hills and weather. Keep reserve at 25% until you know the road. A single-gun site in a ghat village is a queue with no exit; the backup should be before the climb, not after.

Monsoon on NH66 and NH48 ghats adds time, spray, and the occasional blocked lane. Time is energy when HVAC stays on. Split the day. Pune → Goa and Bangalore → Coimbatore are the practice pieces; Manali–Leh is not a first ghat lesson.

Western Ghats toward Goa, Sahyadri toward Lonavala, and the Tamil Nadu / Kerala climbs are energy events first. Regeneration on the descent does not refund a climb you entered at 18%. Plan a DC stop on the plains side to 80–90% before the road tilts. Hill-town pins are top-ups and hotel problems, not the primary plan for a 40 kWh-class pack.

Enable hills in EV Grids when the corridor notes say the leg climbs. The SOC walk then uses a harsher factor instead of a Deccan-flat Wh/km. If you also have 38°C HVAC, raise Wh/km yourself; stacked penalties are real and are not a single ‘plus 5%’ folklore number.

Monsoon on ghats is spray, trucks, and the occasional blocked hairpin. Time with HVAC on is energy. Raise reserve toward 25%. A charger 200 m off the highway that you cannot enter because the approach ponds is a dead charger for that hour — another reason the backup should sit in the same town, not 70 km later.

Ghat posted speeds exist because of trucks and camber, not because they are optional. Climbing at 40 km/h in first-and-second is still a high Wh/km event. Descending with regen on is useful and still not a substitute for the plains-side fill. If the car reports a steep grade warning, believe the car over a brochure kilometre remaining figure.

Overnight in a ghat town only helps if the hotel socket is real. Call. A 7 kW AC from 10 p.m. to 6 a.m. can reset a Nexon morning; it will not fill a 75 kWh SUV from 15%. Plan the last DC of the driving day accordingly.

The pattern is the same on the Western Ghats toward Goa, the Sahyadri toward Lonavala and Pune, and the Tamil Nadu / Kerala climbs: fill on the plains, spend on the grade, treat hill-town DC as a top-up. It is not the same as an NH44 Deccan-flat day, even when the kilometre count looks similar on a brochure.

If the corridor page mentions ghats or monsoon together, raise reserve and enable both hills and weather. Stacked penalties are why people who ‘did Bangalore–Chennai without charging’ still get surprised on Pune–Goa. Those are different energy problems.