It is one of the first questions people ask before buying a home EV charger: will it overload my home's electricity? Will the MCB trip every time the AC and the charger run together? Will I need a new connection?
The honest answer: an EV charger is one of the biggest loads your home will ever run, so the worry is reasonable. But overload is a planning problem, not a reason to avoid home charging. If the charger is sized to your connection and installed on its own protected circuit, most Indian homes can charge an EV without trouble.
This guide explains how much power a home charger draws, how to check whether your connection can take it, and what "load management" actually means.
How much power does a home EV charger draw?
A home AC charger draws a steady current for hours at a time. That is what makes it different from most appliances, which run in short bursts.
- A 3.3 kW charger, such as the Kazam Zip Pro, draws about 16 A on a single phase 240 V supply.
- A 7.4 kW charger, such as the Kazam Zoom 7.4 kW AC charger, draws about 32 A on a single phase supply.
For comparison, rough figures for common appliances:
- A 1.5 ton split AC: roughly 1.5 to 2 kW while the compressor runs
- An electric geyser: roughly 2 to 3 kW
- An induction cooktop: roughly 1.5 to 2 kW
- Fans, lights, fridge and TV together: often under 1 kW
So a 3.3 kW charger draws about as much as a geyser and an AC running together, and a 7.4 kW charger draws more than most households use at their evening peak.
Sanctioned load: the number that decides everything
Your electricity bill shows a sanctioned load (sometimes called contract demand), in kW. This is the maximum load your DISCOM has agreed to supply to your home. The meter, service cable and main breaker are all sized around it.
To see whether a charger fits, add up what could realistically run at the same time on a busy evening, then add the charger.
An illustrative example for a home with a 7 kW sanctioned load:
- Two ACs running: about 3.5 kW
- Induction cooking dinner: about 2 kW
- Lights, fans, fridge, TV: about 0.8 kW
- Evening total before the EV: about 6.3 kW
Add a 3.3 kW charger and the total reaches about 9.6 kW. Add a 7.4 kW charger and it reaches about 13.7 kW. In both cases the home goes over its sanctioned load if the car charges while the household is at its peak.
What happens then depends on your setup. The main breaker may trip. With smart meters recording maximum demand, your DISCOM may also apply excess demand charges or ask you to regularise the higher load. The rules vary by state, so check with your DISCOM.
Why the charger's own overload protection is not enough
Kazam chargers come with protection built in. Zip Pro, for example, has overload, overvoltage and surge protection plus a 30 mA residual current device. Zoom comes with 10 layers of safety.
These protect the charger and its circuit. They stop the charger from drawing more than it should and cut power if something goes wrong. What they do not do is watch the rest of your home. A charger working perfectly within its own limits can still push the whole house over its sanctioned load when the AC, geyser and induction are running too.
That is where planning and load management come in.
Load management, explained
Load management means controlling when and how much power the charger draws, so the total home load stays within safe limits. There are four practical approaches, from simplest to most advanced.
1. Right size the charger
The simplest load management is choosing a charger your connection can carry. If your evening load is already close to your sanctioned load, a 3.3 kW charger is easier to accommodate than a 7.4 kW one. It also suits electric two-wheelers and cars with a 3.3 kW onboard charger, where a bigger charger would not charge any faster anyway.
2. Shift charging to when the house is quiet
Most cars are parked overnight for 8 to 10 hours. By then, cooking is done and fewer appliances are running. Starting the charge at 11 pm instead of 7 pm removes most of the overlap with the evening peak.
A smart charger makes this automatic. Zip Pro supports scheduling and auto cut off through the Kazam app, so you can plug in when you get home and let the session begin later. Where your DISCOM offers cheaper night rates under time-of-day tariffs, the same habit can lower your bill too.
3. Upgrade the connection when the numbers demand it
If you need a 7.4 kW charger for a large battery or heavy daily driving, and your sanctioned load cannot carry it, the right fix is a load enhancement from your DISCOM. Depending on your state and the new load, this may mean moving to a three-phase connection. It is paperwork and a fee, done once, and it removes the overload risk at its source.
4. Dynamic load management
Dynamic load management uses a sensor on your main supply to measure total home consumption in real time. When other appliances switch on, the charger automatically lowers its current, then raises it again when they switch off. It is most useful when a large charger is installed on a connection with little spare capacity.
The same idea works at a much bigger scale. When dozens of chargers share one supply, as in a fleet depot, Kazam's Energy Management System distributes the available power across chargers in real time and shifts charging away from peak demand.
For most single homes, though, the first three steps solve the problem without any extra hardware.
What about apartments and housing societies?
In an apartment, your charger usually connects to your own meter, so your flat's sanctioned load still applies. The extra question is the building's capacity. If several residents install chargers on the same supply, the society's total load, and the transformer behind it, matter.
This is why a proper site assessment comes first. For societies, Kazam assesses the parking layout, the existing electrical capacity and the load available from the DISCOM before anything is installed. Charging is then tracked per resident through the app. See Kazam's EV charging for housing societies.
Signs your home may need a load check
- Your main MCB or breaker already trips when the AC and geyser run together
- Your lights flicker or dim when heavy appliances switch on
- Your sanctioned load is low compared with your appliances, for example 3 to 5 kW with multiple ACs
- Your wiring is old, or the house has no proper earthing
- You are planning a 7.4 kW charger on a single phase connection
None of these rules out home charging. They mean the installation needs a check, and possibly an upgrade, before the charger goes in.
Before you install: a quick checklist
- Find your sanctioned load on your electricity bill.
- List the heavy appliances that run at your evening peak.
- Check your car's AC onboard charger rating, so you do not oversize the charger.
- Make sure the charger gets its own dedicated circuit with a correctly rated MCB, never a shared socket.
- Confirm the earthing is sound. Poor earthing is a common problem in older buildings.
- Ask your installer to test supply voltage, since frequent voltage fluctuations matter for long charging sessions.
Kazam's installation team checks earthing, wiring, load capacity and voltage fluctuations as part of every install. Learn more about Kazam home EV charging.
Frequently asked questions
Will a home EV charger trip my MCB?
Not if it is on its own dedicated circuit with a correctly rated MCB and the total home load stays within your sanctioned load. Trips usually happen when a charger shares a circuit or when the whole house goes over its supply limit at peak time.
Can I charge my EV from a regular wall socket instead?
It is not recommended. A socket carrying a high current for hours can overheat. A purpose-built charger has its own protection, a dedicated circuit and the right connector for continuous charging.
Do I need a three-phase connection for a 7.4 kW charger?
The Kazam Zoom 7.4 kW is a single phase charger. Whether your home needs a load enhancement or a three-phase connection depends on your existing sanctioned load and your DISCOM's rules. A site assessment will tell you.
Is a 3.3 kW charger safer for my home's load than a 7.4 kW charger?
It puts less demand on your supply, so it is easier to fit within a modest sanctioned load. A 7.4 kW charger is just as safe when your connection is sized for it. The choice comes down to your car, your driving and your supply.
Does scheduling help with load?
Yes. Scheduling the charge for late night keeps it away from your evening peak, which is often enough to stay within your sanctioned load without any upgrade.
Not sure what your home can handle?
Every home's connection is different. Kazam's team will check your sanctioned load, wiring and earthing, recommend the right charger, and share pricing for your setup. Not sure where to start? Try the Kazam Solution Finder.
