A colleague who bought an Ola S1 Pro last year kept telling everyone his running cost was “basically free.” When I actually sat down and worked the numbers with him, it wasn’t free, it was around 21 paise a kilometre, but next to what he used to spend on petrol, “basically free” wasn’t far off as a feeling, even if the math says otherwise. That gap between what people assume and what EV charging actually costs is exactly why this calculator exists. Here’s the real math, home charging versus public fast charging, and what it means against a petrol or diesel vehicle covering the same distance. Last updated: July 2026
Home charging vs public charging in Assam
Where you charge changes your cost more than almost anything else about the vehicle.
| Charging Mode | Effective Cost per kWh | Charging Time |
|---|---|---|
| Home Charging (Domestic Meter) | ₹6.00 to ₹7.20 | 3 to 8 hours (Slow AC) |
| APDCL Public Slow Charger | ₹8.20 to ₹9.70 | 3 to 5 hours (AC Wallbox) |
| Commercial DC Fast Charger | ₹12.00 to ₹15.00 | 45 to 60 minutes (DC Fast) |
The home charging figure isn’t one fixed number for everyone, APDCL bills domestic electricity on a telescopic slab system based on your sanctioned load. Domestic-A connections (under 5 kW) start as low as ₹4.25/unit for the first 120 units, climbing to ₹6.30 and then ₹8.19 as usage rises, while Domestic-B connections (above 5 kW) start higher, around ₹6.75/unit. Charging an EV regularly adds enough monthly units that it can push you into a higher slab, so your real home charging cost depends on where your total household usage lands, not just the sticker rate.
How the calculation works
- Full Charge Cost = Battery Capacity (kWh) × Rate per kWh
- Running Cost per Km = Full Charge Cost ÷ Real-World Range (km)
- Compare against Petrol Cost per Km = Fuel Price per Litre ÷ Vehicle Mileage (km/L)
Now a full-size EV against a petrol car over a month of driving:
My colleague’s Ola S1 Pro lands almost exactly on the first example, which is probably why “basically free” felt true enough to him even before either of us ran the actual numbers.
Popular EV models, battery size, and full-charge cost
| Vehicle | Battery | Range | Home Charge Cost |
|---|---|---|---|
| Ather 450X | 3.7 kWh | ~105 km | ~₹24 |
| Ola S1 Pro | 4.0 kWh | ~125 km | ~₹26 |
| Mahindra Treo (e-Auto) | 7.37 kWh | ~130 km | ~₹48 |
| Tata Tiago EV | 24.0 kWh | ~200 km | ~₹156 |
| Tata Nexon EV Long Range | 40.5 kWh | ~320 km | ~₹263 |
| MG ZS EV | 50.3 kWh | ~380 km | ~₹327 |
How to Use the Calculator
Step 1. Select your vehicle type: Electric Scooter (2W), E-Auto (3W), or Electric Car (4W).
Step 2. Enter your battery capacity in kWh. Step 3. Enter your real-world range and choose your charging location, Home or Public Fast Charger.
Step 4. Click “Calculate EV Cost” to see your full charge cost, per-km running expense, and monthly petrol savings.
Some things people ask us often
Kya Assam me ghar par EV charge karna legally allowed hai?
Haan. APDCL personal electric 2-wheelers aur 4-wheelers ko ghar ke standard 15A wall socket se charge karne ki permission deta hai, jiska billing normal domestic tariff par hota hai.
Commercial EV charging station kholne ke liye APDCL commercial tariff kya hai?
APDCL ne dedicated EV Charging Station tariff category banayi hai, jiska base rate around ₹6.70/kWh hai. Commercial operators ispar apna ₹2 se ₹8 per unit service charge add karke EV owners ko charging offer karte hain.
EV battery ko full charge hone me kitna time lagta hai?
Electric 2-wheelers home charger se 3 se 4 ghante lete hain. Electric cars 7.2 kW AC home wallbox se 6 se 7 ghante, aur public 50 kW DC fast charger se 45 se 60 minute me charge ho jati hain.
Main apna EV mostly din me office parking me charge karta hu, jaha commercial rate lagta hai, lekin kabhi kabhi ghar par bhi charge karta hu, monthly cost estimate karte waqt kya karu?
Dono modes ka apna share nikal kar weighted average nikalna sabse accurate rahega, sirf ek rate maan lena misleading ho sakta hai. Jaise, agar aap 70% charging office (commercial rate) par aur 30% ghar par karte hain, to apna monthly kWh usage isi ratio me split karke dono rates se calculate karein, phir add karein, sirf ek rate se poora estimate na banayein.
Assam me public EV charging stations kahan milenge?
APDCL aur oil companies Guwahati, Tezpur, Nagaon, Jorhat, Dibrugarh, aur Silchar ke highway petrol pumps par public DC fast charging stations expand kar rahe hain, jinhe Tata Power EZ Charge ya Statiq jaisi apps par locate kiya ja sakta hai.
Is this an official APDCL calculator?
No. This tool applies published tariff ranges and typical EV battery specs to estimate your cost. Your actual home charging rate depends on your specific sanctioned load and slab, and public charger rates vary by operator, this calculator gets you a close working estimate, not your exact bill.
Official Resources
Tariff categories and rates get revised through AERC orders, so it’s worth checking directly:
If you’re deciding between home and public charging for daily use, the difference isn’t small, home charging on a lower slab can cost roughly half of what a commercial DC fast charger does per unit, it’s worth planning your routine around home charging wherever your daily range allows it.
