EV Fleet Depot Charging Setup in India: A 2026 Guide

If you run a commercial EV fleet in India — whether it is 20 e-rickshaws, a hundred L5 cargo three-wheelers doing last-mile delivery, a pool of e-cars for ride-hailing, or a depot of electric buses — your charging setup is no longer a side detail. It is the single biggest factor deciding whether your vehicles earn money tomorrow morning or sit idle waiting for power.

Diesel never had this problem. You filled a tank in five minutes from a pump that someone else built and maintained. Electric flips that equation. The energy is cheaper per kilometre, but you now own a piece of the fuel infrastructure, and how well you plan it directly controls your uptime, your demand charges, your per-km cost and ultimately your margins.

This guide is written for Indian fleet operators, delivery and logistics businesses, e-rickshaw and three-wheeler owners, and commercial-EV buyers who are setting up — or fixing — depot charging. It is deliberately practical and honest about the trade-offs. Numbers are indicative ranges, because real costs swing widely with your DISCOM, your state, your land, and your fleet mix. Treat them as planning anchors, not quotes.

Why depot charging matters for Indian fleets

A fleet lives and dies by vehicle availability. A delivery three-wheeler that should run 120 km a day earns nothing while it queues at a public fast charger or waits for a slow trickle charge. Public charging also costs far more — often Rs 18 to Rs 24 per kWh at commercial DC stations — than energy you draw at your own depot on an off-peak commercial tariff.

Depot charging solves three things at once. First, it gives you predictable energy at a much lower price because you charge overnight on your own connection. Second, it gives you control over uptime — no dependence on whether a third-party charger is working or occupied. Third, it lets you schedule charging around your duty cycles so vehicles are ready exactly when the morning shift starts.

The catch is that you are now responsible for grid connection, transformer capacity, chargers, load management and ongoing maintenance. Done well, depot charging is a quiet money-maker. Done badly — undersized transformer, no load balancing, dead chargers no one notices — it becomes the bottleneck that kills your fleet economics. The rest of this guide is about getting it right.

How depot charging actually works

At its simplest, a depot is a place where your vehicles return at the end of a shift, plug in, and charge back to full before the next shift. But the engineering underneath has a few moving parts that you need to understand even if a vendor builds it for you.

The energy chain

Power comes from your DISCOM through a grid connection. For anything beyond a handful of small vehicles, that means a Low Tension (LT) or High Tension (HT) connection with a transformer that steps the voltage down to what your chargers use. From the transformer, power flows through distribution panels, cabling and earthing to the chargers themselves. The chargers convert and deliver energy to each vehicle's battery — either as AC (the vehicle's onboard charger does the conversion) or DC (the charger does it, which is faster).

AC versus DC charging in a depot

Most well-designed Indian depots use a mix, chosen to match how long vehicles sit idle.

AC slow charging (3.3 kW to 22 kW) is cheapest per port and ideal for overnight charging when vehicles park for 8 to 12 hours. E-rickshaws, two-wheelers and many three-wheelers charge perfectly on AC overnight. This is the backbone of most small and mid fleets.
DC fast charging (30 kW to 120 kW) is for vehicles that need a quick mid-day top-up or have short turnaround windows — cargo three-wheelers on double shifts, e-cars in ride-hailing, or buses on tight schedules. DC is more expensive per port but buys you turnaround speed.
Ultra-fast DC (150 kW and above) is mostly for heavy electric trucks and intercity buses and is uncommon in city delivery fleets.

The art is matching charger type to duty cycle. Overprovisioning DC fast chargers when your vehicles sit idle all night is the most common way fleets waste lakhs of rupees.

The simultaneity factor — the number that saves you money

Here is the single most important planning insight: your vehicles do not all charge at full power at the same moment. If you have 50 chargers, you almost never need 50 times the peak charger draw from the grid, because vehicles arrive at different times, finish at different times, and a smart system staggers them.

This is captured by a simultaneity (or diversity) factor, typically 0.5 to 0.8 for an overnight depot. A common transformer-sizing rule of thumb looks like this:

Fleet size x charger power x simultaneity factor x growth buffer = transformer load.

For example, 50 buses x 50 kW x 0.7 simultaneity x 1.2 growth buffer comes to roughly 2.1 MW. For a smaller delivery fleet — say 50 cargo three-wheelers each drawing a 30 kWh top-up over an 8-hour window — the continuous load is closer to 187 kW, and with margin you might sanction 250 to 300 kW. Getting this factor right is the difference between paying for a 2 MVA transformer and a 1.2 MVA one.

Operational considerations: uptime, charging windows and maintenance

A depot is not a one-time installation; it is an operating system. The things that decide your real-world economics are operational, not just the CAPEX.

Uptime is the whole game

For a fleet, charger uptime translates directly into vehicle availability, which translates into revenue. The industry benchmark to aim for is 95 to 98 percent charger uptime, achievable with real-time monitoring, predictive maintenance and quick fault resolution. A charger that is down for two days during a festival delivery rush can cost more in lost trips than the charger itself.

The practical levers for uptime are: networked chargers that report faults automatically, a maintenance contract with a defined response time (ideally faults resolved within 24 hours), and a small stock of spare cables, connectors and fuses on site so a Rs 2,000 part does not idle a Rs 3 lakh vehicle.

Charging windows and Time-of-Day tariffs

Since April 2024, commercial and industrial consumers drawing more than 10 kW have moved onto Time-of-Day (ToD) tariffs, and this is expanding across non-agricultural categories. Under ToD, electricity costs more during peak hours and meaningfully less off-peak. Off-peak night charging can cost 30 to 60 percent less than daytime peak rates — in Mumbai, for instance, overnight EV tariffs have run around Rs 5.50 to Rs 7.50 per kWh against daytime rates above Rs 12.

For a fleet that parks overnight anyway, this is almost free money: schedule the bulk of your charging into the off-peak window and you cut your single largest operating cost. Smart charge management that shifts load to off-peak hours can reduce energy costs by 20 to 35 percent, and aggressive off-peak scheduling can do even more.

Demand charges — the hidden line item

Your electricity bill has two parts: energy charges (per kWh) and demand or capacity charges (per kVA of sanctioned load, billed monthly whether you use it or not). Across Indian states these capacity charges range from roughly Rs 40 per connection per month to Rs 190 per kVA per month, while EV energy charges run about Rs 4 to Rs 7.7 per kWh.

Demand charges are why load balancing matters even when you have spare energy budget. If all your chargers spike together, your peak demand jumps and your monthly demand charge with it. Dynamic load management — spreading the same total energy over time so the peak stays low — can cut demand charges by 17 percent or more. Right-sizing your sanctioned load (not over-sanctioning "just in case") saves money every single month.

Maintenance realities

Chargers in Indian depots face dust, heat, monsoon humidity, voltage fluctuations and rough handling of connectors. Common failure points are connector wear, contactor faults, communication dropouts, cooling-fan failures on DC units, and damage from voltage spikes. Preventive maintenance — periodic inspection, connector cleaning, firmware updates and earthing checks — is far cheaper than reactive repair plus lost vehicle uptime. If you run solar, panel cleaning gets added to the list.

Real numbers: indicative CAPEX, cost-per-km and payback

Every depot is different, so these are indicative ranges for planning. Get site-specific quotes before committing.

Charger hardware (indicative)

AC slow charger (3.3 to 7.4 kW): Rs 15,000 to Rs 60,000 per point for small commercial units; LT three-phase AC units cost more.
30 kW DC fast charger: roughly Rs 4 to 6 lakh per unit.
60 kW DC fast charger: roughly Rs 8 to 12 lakh per unit (you will also see 60 kW units quoted from about Rs 3 lakh upward at the budget end).
120 kW DC fast charger: roughly Rs 18 to 25 lakh per unit.

Electrical and civil infrastructure (indicative)

Transformer and substation: Rs 15 to 40 lakh depending on capacity.
Cabling, panels and earthing: Rs 8 to 20 lakh.
Software and load-management system: Rs 3 to 10 lakh.
DISCOM security deposit: this is a big one. For a large depot it can be up to half the total project cost. For a 100-bus depot costing around Rs 5 crore, as much as 50 percent can go into the security deposit to the distribution company.

Total depot CAPEX by fleet size (indicative, delivery/3W and similar)

10 vehicles: Rs 35 to 60 lakh.
25 vehicles: Rs 80 lakh to Rs 1.3 crore.
50 vehicles: Rs 1.5 to 2.5 crore.
100-plus vehicles: Rs 3 to 5 crore.

A small e-rickshaw fleet using overnight AC points sits at the very bottom of these ranges; a bus or heavy-cargo depot with DC fast charging sits at the top.

Cost-per-km — where the savings live

This is what makes the whole exercise worthwhile.

E-rickshaws run at roughly Rs 0.50 to Rs 1.00 per km on energy, with a daily charge of a 100 Ah battery costing about Rs 50 to Rs 70 depending on tariff.
L5 cargo three-wheelers consume around 150 to 200 Wh per km loaded; running costs of about Rs 0.92 per km have been cited for popular electric cargo three-wheelers.
Fleet cars and larger vehicles still come in dramatically below diesel; depot-charged commercial EVs commonly run 50 to 60 percent cheaper on fuel than the diesel equivalent.

For context, a diesel three-wheeler or small commercial vehicle often costs Rs 4 to Rs 7 per km on fuel alone. Cutting that to under Rs 1.50 per km across a fleet doing hundreds of kilometres a day compounds fast.

Operating cost example

A 50-truck depot consuming about 1,500 units a day works out to roughly 45,000 units a month. At a commercial tariff of Rs 6 to Rs 9 per unit, that is about Rs 2.7 to Rs 4 lakh a month in electricity — against a diesel bill that would typically be 50 to 60 percent higher.

Payback

For commercial EV depots, payback on the charging infrastructure commonly lands in the 2.5 to 4 year range, depending heavily on fleet utilisation. The harder your vehicles run and the more disciplined your off-peak charging, the faster you recover the investment. Low-utilisation depots — vehicles sitting idle, chargers underused — stretch payback well past this, which is exactly why right-sizing matters.

Solar as a multiplier

If you have roof or carport space, solar can cut your effective energy cost to roughly Rs 3 to Rs 5 per kWh, since solar generation itself can land around Rs 2.5 to Rs 3.5 per kWh in high-irradiance states like Gujarat, Rajasthan, Tamil Nadu and Maharashtra. A 100 kW commercial solar carport runs about Rs 70 to 80 lakh including panels, inverters, mounting, chargers and civil work, with payback often in the 4 to 5 year range. Solar pairs well with daytime opportunity charging but does little for a purely overnight fleet unless paired with storage.

Common challenges and how to solve them

Depot projects fail in predictable ways. Here are the big ones and what actually works.

Grid connection delays

A new HT or 33 kV connection from a DISCOM can take anywhere from 3 to 18 months, and for a depot needing 500 kW or more this is often the critical-path item that blocks the whole project. Apply for your sanctioned load on day one, in parallel with everything else. Engage the DISCOM early, budget for the security deposit, and where possible phase your build so you can start operating on an interim load while the full connection is processed.

Undersized or oversized transformer

Undersize it and you trip breakers and cannot charge your full fleet; oversize it and you pay demand charges on capacity you never use. Solve this by computing load honestly with a realistic simultaneity factor and a modest growth buffer, not by guessing high. Smart load management lets you run more chargers off a smaller transformer safely.

Demand-charge shock

Operators are often blindsided when the first bill arrives with a large capacity charge. Mitigate with dynamic load balancing so chargers never all peak together, and by sanctioning the right load rather than a padded one.

Chargers that fail silently

A dead charger no one notices until the morning shift is pure lost revenue. Use networked, OCPP-compliant chargers (OCPP is the open protocol standard, and networked chargers are expected to comply under current Ministry of Power guidelines) so faults are reported automatically, and back them with a maintenance contract that has a defined response SLA.

Mixed-fleet complexity

Many real depots charge several vehicle types — three-wheelers, cars, maybe a few buses — each with different connectors, voltages and charging speeds. Plan port types per sub-fleet and use a charge-management system that can prioritise across them, charging the vehicles needed first, first.

High upfront capital

Not every operator can put crores into infrastructure up front. Charging-as-a-Service (CaaS) and Energy-as-a-Service models let a partner build and maintain the depot while you pay per unit or per month with uptime SLAs, converting CAPEX into OPEX. Government support also helps: under the PM E-DRIVE scheme (Rs 10,900 crore outlay, with Rs 2,000 crore for charging infrastructure and now extended in parts to 2028), subsidies of up to 70 to 100 percent are available on EVSE and upstream infrastructure at qualifying locations including bus depots, plus state-level EV policies with their own incentives.

Step-by-step checklist for setting up a fleet depot

Use this as a practical sequence. Steps overlap in time — especially the grid application, which you start early.

Map your duty cycles. For each vehicle type, record daily km, battery size, when vehicles return to depot, and how long they sit idle. This drives everything else.
Calculate daily energy and peak load. Sum the daily kWh across the fleet, then size your peak load using a realistic simultaneity factor (0.5 to 0.8) and a small growth buffer.
Decide your charger mix. Match AC slow charging to vehicles that park overnight and DC fast charging only to vehicles with short turnaround windows. Aim for the lowest charger count that still meets your schedule — a 1:3 charger-to-vehicle ratio is achievable with shift-based scheduling for many fleets.
Apply for the DISCOM connection immediately. Submit your sanctioned-load application early; budget for the security deposit; confirm whether LT or HT is required.
Size the transformer and electricals. Specify transformer capacity, panels, cabling and earthing to your peak load, not your theoretical maximum.
Choose networked, OCPP-compliant chargers with a charge-management system that supports dynamic load balancing and ToD scheduling.
Plan the site layout. Allow parking and circulation space (roughly 0.5 to 1 acre for 10 to 20 vehicles, scaling up from there), safe cable routing, and ventilation for DC units.
Evaluate solar. If you have roof or carport area and meaningful daytime charging, model a solar addition and its payback.
Set up monitoring and a maintenance plan. Configure fault alerts, define an uptime target (95 percent plus), arrange a maintenance/AMC contract with a response SLA, and stock critical spares.
Tap available incentives. Check PM E-DRIVE and your state EV policy for capital subsidies, demand-charge waivers and dedicated EV tariffs before you finalise costs.
Pilot, then scale. Commission a subset, run it for a few weeks, measure actual uptime, energy cost and per-km cost, then refine before expanding.

How ev.care helps fleet operators

Building the depot is half the job; keeping it — and the fleet — running is the other half. ev.care is India's multi-brand EV repair and service brand, and we work with commercial fleet operators on exactly the operational side that decides your economics.

Multi-brand fleet maintenance. Mixed fleets are the norm, with vehicles and chargers from many OEMs. We service across brands, so you deal with one partner instead of chasing each manufacturer separately.
Annual Maintenance Contracts (AMC) built for uptime. Predictable, scheduled servicing for your vehicles and charging hardware, with defined response times so a fault gets fixed before it idles a shift. You can book fleet EV service or set up an AMC to put this on a contract footing.
EV charging repair and service. Chargers fail — connectors, contactors, communication, cooling. Our EV charging repair and service covers diagnosis and repair of depot chargers so your ports stay live.
Doorstep and on-site repair. For fleets, bringing vehicles to a workshop is itself downtime. We bring service to your depot where feasible, minimising the trips your vehicles lose.
Diagnostics first. Before you escalate to a repair, our free EV charging diagnostic tool helps you and your team triage a charging fault quickly — often the issue is something you can resolve on the spot.

If you also want to understand the vehicle side of the equation — battery health, range loss and replacement economics that directly affect your per-km cost — these related guides are worth reading: EV battery degradation and range loss in India, EV battery replacement cost in India, and diagnosing an EV that is not charging.

Frequently asked questions

How much power connection do I need for my fleet depot?

Start from daily energy, not vehicle count. Add up the kWh each vehicle needs per day, decide your charging window, and apply a simultaneity factor of 0.5 to 0.8 plus a small growth buffer. A 50-vehicle delivery fleet topping up around 30 kWh each over an 8-hour overnight window needs roughly 250 to 300 kW of sanctioned load; a 50-bus depot can need around 2 MW. Always size to your realistic peak, not the theoretical maximum, so you do not overpay on demand charges.

Is it cheaper to charge at the depot or use public charging?

Depot charging is almost always cheaper for a fleet. Public DC fast charging in India often runs Rs 18 to Rs 24 per kWh, while a depot on a commercial off-peak tariff can pay Rs 5.50 to Rs 9 per kWh, and even less with solar. The bigger win is control: depot charging removes your dependence on whether a public charger is free or working, which protects uptime. Public charging is best kept as an occasional backup, not your primary strategy.

How long until a depot charging setup pays for itself?

For well-utilised commercial fleets, payback on charging infrastructure commonly lands in 2.5 to 4 years, driven mainly by the fuel saving over diesel (often 50 to 60 percent cheaper) and disciplined off-peak charging. Heavier vehicle utilisation shortens payback; idle vehicles and underused chargers lengthen it. Solar additions typically pay back in 4 to 5 years on top.

Should I install AC slow chargers or DC fast chargers?

Match the charger to how long vehicles sit idle. If they park overnight for 8 to 12 hours — typical for e-rickshaws, two-wheelers and many three-wheelers — AC slow charging is cheaper and entirely sufficient. Reserve DC fast charging for vehicles with short turnaround windows, double shifts, or tight schedules. Most efficient depots use a deliberate mix and avoid over-buying expensive DC ports that sit unused all night.

How do I keep my charging uptime high?

Target 95 percent or higher. Use networked, OCPP-compliant chargers that report faults automatically; sign a maintenance or AMC contract with a defined response time (ideally faults fixed within 24 hours); keep critical spares — connectors, cables, fuses, contactors — on site; and run preventive maintenance on a schedule rather than waiting for failures. The cost of a stocked spare part is trivial next to the revenue lost when a vehicle cannot charge.

What government support is available for fleet charging in India?

The central PM E-DRIVE scheme carries a Rs 10,900 crore outlay with Rs 2,000 crore earmarked for charging infrastructure, supporting tens of thousands of chargers and offering subsidies of up to 70 to 100 percent on EVSE and upstream infrastructure at qualifying locations, including bus depots; parts of the scheme have been extended toward 2028. On top of this, most states run their own EV policies with capital subsidies, dedicated EV electricity tariffs, and in some cases demand-charge waivers. Check both central and your state-specific policy before finalising your project budget, as the incentives can materially change your CAPEX.