If your parking spot is close to your flat's electricity meter, extending your own supply with a private sub-meter is usually the simplest and most society-friendly way to power an EV charger. A separate meter in your name from the DISCOM gives the cleanest billing separation — worth the paperwork when the cable run from your flat would be long, or when your DISCOM has a dedicated arrangement for EV connections. Charging from the society's common meter suits shared chargers rather than private ones, because every unit you draw has to be measured and recovered from you fairly. The right choice comes down to four things: wiring distance, billing clarity, society acceptance and future flexibility.
What the three connection choices actually mean
The terms get used loosely in society meetings, so be precise about what you are proposing.
- Own meter: a new connection from your DISCOM, in your name, dedicated to the charging point. The DISCOM installs the meter and bills you directly. Some DISCOMs have specific categories or processes for EV connections — confirm with yours what applies.
- Sub-meter: a private check meter fitted after an existing connection — usually your flat's meter, sometimes the society's. It measures the charger's units, but the DISCOM still bills whoever holds the parent connection. It exists for fair allocation, not official billing.
- Common meter: the charger runs off the society's supply, and your usage is recovered through maintenance dues or a per-unit charge. Natural for a shared station, weakest for a private charger.
Wiring distance decides more than most people expect
Every option begins with a cable from a supply point to your parking spot, and that cable's length and route often settle the choice before billing comes up. A short run down one wall from your own meter is a minor job. A run across a basement and past other residents' spots needs thicker cable to limit voltage drop, proper conduit, and the society's written permission for the route.
Here is the intuition, with clearly illustrative numbers. Suppose installed cabling costs, say, ₹350 per metre (a made-up round figure — get real quotes). A 10-metre run from your flat meter is about ₹3,500; a 60-metre run crosses ₹21,000. At that distance, a new DISCOM connection with its meter placed nearer your parking may compare well once you add application and deposit costs — which vary, so ask your DISCOM. Try your own figures in the apartment charger cost calculator, and read who pays for apartment EV-charger wiring before assuming the society will share the cost.
Billing clarity: who reads what, and who pays whom
With an own meter, billing is as clean as it gets: the DISCOM bills you directly, and nobody in the society sees a rupee of your charging cost.
A sub-meter on your flat's supply is nearly as clean. The units already sit on your own bill; the sub-meter simply proves how many went to the car. Do check one thing: if your tariff has slabs, extra units may land in a higher slab. Say your bill shows ₹6 per unit up to a threshold and ₹8 beyond it (an example only — check your actual bill): 150 charging units a month would mostly fall at the higher rate.
Charging from the common meter is where disputes breed. The society pays the DISCOM, you reimburse the society, and someone must fix the per-unit rate. The common connection's tariff category may differ from your domestic rate, and the society may add a handling charge; none of that is wrong, but all of it must be agreed in writing before the first charge. The measurement mechanics are compared in sub-meter versus smart-charger billing.
What your society is most likely to accept
Committees worry about three things: load on shared infrastructure, precedent for the next ten requests, and disputes landing on their table. Judge each option against those worries.
Feeding the charger from your own flat meter usually raises the least objection — the load sits on your connection, and the society's role shrinks to approving the cable route and installation standard. A new DISCOM meter is also generally well received, though many DISCOMs ask for the society's no-objection before releasing an additional connection — yours will tell you what consent it wants. The common-meter route draws the most scrutiny, fairly so: your consumption sits inside everyone's shared bill until recovered. Whichever you propose, put it in writing — the approach in how to request EV-charger permission from your RWA works for all three.
Future flexibility: upgrades, second EVs and selling the flat
Think two or three years ahead before you decide.
- Upgrading charger power: moving from a 3.3 kW to a 7.2 kW charger roughly doubles the current drawn. On your flat's supply, that headroom must fit within your sanctioned load, or you apply to enhance it. A dedicated connection can be sized for the bigger charger from day one.
- A second EV: two vehicles on one flat connection strain sanctioned load quickly; an own meter sized generously, or a shared station, copes better.
- Selling or renting out: a sub-meter on your flat's supply passes on naturally with the flat. A separate meter follows your DISCOM's transfer or surrender process. A common-meter arrangement is personal to you; the next user needs a fresh agreement.
Decision table and what to choose in your situation
Here is the whole comparison in one view.
| Factor | Own DISCOM meter | Sub-meter on your supply | Common meter |
|---|---|---|---|
| Billing clarity | Cleanest — DISCOM bills you directly | Clean — units on your own bill, sub-meter as proof | Depends entirely on the society's recovery rules |
| Wiring suitability | Good for far parking if the meter can sit nearer the spot | Best when parking is close to your meter | Often the shortest run — common panels sit near parking |
| Society acceptance | Usually smooth; may need an NOC and meter-board space | Usually smoothest; only route approval needed | Most scrutiny; needs a written recovery agreement |
| Upfront effort | Highest — application, documents, waiting time | Lowest — an electrician's job plus society approval | Low wiring effort, high negotiation effort |
| Future flexibility | High — can be sized for bigger chargers | Limited by your flat's sanctioned load | Tied to committee decisions, which change |
| Best suited for | Long cable runs, heavy or long-term use | Parking near your meter, one private charger | Shared charging for several residents |
As recommendation logic, work down this list and stop at the first line that matches you:
- Parking within a short run of your flat's meter, one EV, modest charger: extend your own supply and fit a sub-meter for records. Simplest approvals, cleanest costs.
- Parking far from your meter, or sanctioned load already tight: ask your DISCOM about a new connection for the charging point before spending on a long cable run.
- Several residents wanting to charge, or no exclusive parking: propose a shared station on the common meter with a written recovery arrangement — start from the shared-charging billing agreement template.
- Not sure where you stand: run through the apartment EV readiness checklist first — it surfaces the distance, load and approval questions this choice depends on.
Common questions
Can I get a separate electricity meter only for EV charging?
Often, yes. DISCOMs generally have processes for additional connections at the same premises, and some have specific provisions for EV charging points. The documents, tariff category, deposits and any society no-objection differ between DISCOMs, so confirm the current requirement with yours before planning around it.
Is a private sub-meter valid for settling money with the society?
A sub-meter is a measuring device agreed between you and your society, not an official DISCOM billing meter. It works when both sides trust it: use a decent-quality meter, let the society witness the installation and opening reading, and put the rate and payment cycle in a signed note. Your society's bye-laws may say more — read them.
Will charging from my flat meter raise my per-unit rate?
It can, if your tariff is slab-based: charging units stack on top of household consumption, so the top-most units are billed at your highest applicable slab. Check the slab structure on your own bill and compare that marginal rate with what a separate connection would charge — your DISCOM can confirm both.
Can the society refuse a separate meter?
The connection is between you and the DISCOM, but the cable route, meter position and any work in common areas need the society's consent — and many DISCOMs want the society's no-objection too. Treat the committee as a genuine stakeholder: a written request with the route drawn out and an electrician's plan gets a far better hearing than a done deal.
Whichever connection you choose, cable sizing, protection devices, earthing and load assessment are a licensed electrician's job, and meter, tariff and connection questions belong to your DISCOM. Get both to look at your actual parking spot before you commit money.