Apartment solar is misunderstood more often than any other segment. Individual flat owners usually cannot install a system for their own flat, because the roof is common property. What is genuinely available is solar for the building's shared load, and that is decided collectively.
What this segment needs
In almost every apartment building the roof belongs to all owners jointly, managed by the association. So the practical project is not one flat's system but a common-area system offsetting lifts, water pumps, corridor and basement lighting, the STP, and the fire panel. Those loads run predictably through the day, which suits solar well.
Engineering considerations
The system connects to the association's common-area meter, not to any individual flat meter. Sizing is set by the common-area consumption on that meter, which is usually a fraction of total building consumption. Roof space is rarely the constraint; available common-area load is. Where a building has multiple towers on one connection, distribution mapping matters as much as panel layout.
Karnataka context
Karnataka's net metering rules apply to the connection the system is tied to, so the association's sanctioned load on the common meter governs the capacity. Bengaluru apartment roofs frequently carry water tanks, lift machine rooms, and mobile-tower installations that reduce usable area, so a physical survey matters more here than in most segments.
Common mistakes to avoid
Apartment projects mostly stall for structural and procedural reasons, not technical ones:
- Expecting an individual flat to be able to offset its own bill from a shared roof
- Sizing to available roof area rather than to the common-area meter's actual consumption
- Starting procurement before the association resolution is properly passed
- Overlooking existing rooftop occupancy such as tanks, lift rooms, and telecom equipment
- Not agreeing upfront how savings will be reflected in maintenance charges
What we recommend
Start with twelve months of the common-area meter's bills and a roof survey that maps existing occupancy. That gives a defensible capacity figure to take to the association. Handle the resolution before procurement, and agree in advance how savings will flow back into maintenance charges so the benefit is visible to residents.
Common questions
- Can I install solar just for my own flat?
- Generally no, because the roof is common property. Some buildings permit small balcony installations, but these are limited in capacity and usually cannot be net-metered.
- What does apartment solar actually reduce?
- The common-area electricity bill — lifts, pumps, corridor and basement lighting, STP, and similar shared loads. That cost is normally recovered through maintenance charges, so savings reach residents that way.
- How much roof do we need?
- Roughly 90 to 110 sq ft per kW, but usable area is what counts after tanks, lift rooms, and any telecom equipment. A survey gives the real figure.
- Who approves the project?
- The managing committee, usually with a general body resolution. The exact requirement depends on your association's bye-laws, so confirm the process before committing to any timeline.
- Is group net metering available?
- Karnataka has provisions relevant to shared connections, but applicability depends on your metering arrangement and current ESCOM rules. This needs checking against your specific connection.
Talk to our engineering team for a solar assessment.
We will review your consumption, roof, and site constraints before recommending any capacity.