Solar Panel Installation in Perumbakkam

Multi block complexes designed around your actual metering, not a single assumed connection

Perumbakkam is dominated by large multi-block apartment complexes, and that raises a question smaller societies never face: whether the whole complex takes one system or each block takes its own. Getting that decision right at the start saves considerable money later.

Residential

Solar for Perumbakkam homes

Apartment associations

The market here, claiming ₹18,000 per kW on common areas up to 500 kW.

Multi-block complexes

Need the connection question settled before design.

Individual flat owners

Cannot install on a shared terrace, but can raise it with the association.

Terrace access

Matters to residents, and an elevated structure keeps the space walkable underneath.

Commercial and industrial

Solar for Perumbakkam businesses

Retail and food service

Serving the residential population. Evening-weighted, usually leased.

Clinics and diagnostic centres

Daytime load matching generation.

Schools and institutions

In the surrounding development.

Offices

On the corridor, with good daytime load match and commercial tariffs.

Ground-floor electrical rooms are the weak point

When the Cyclone Michaung floods reached Perumbakkam's resettlement colonies in December 2023, ground-floor homes were quickly inundated, and residents went three days without electricity or water. In many apartment complexes the main LT panel, the meter room and often the inverter all sit on the ground floor. The net meter has to stay with TNPDCL's supply point, but the solar inverters and distribution boxes do not. For a common area system here, we put the inverters on the terrace or the top floor landing and bring a single AC cable down to the panel. That keeps the costly parts above any water level the area has seen.

Three days without power: what solar can and cannot do

A standard on-grid system shuts down the moment the grid goes off, so it would not have helped those three days. If keeping water running matters, a hybrid inverter with a battery can be sized to back up one sump or borewell pump, the stair lighting and the security gate. A lift, or every pump in the complex, needs a far larger battery and is rarely worth it. We design the backup circuit as a separate board, so the committee knows exactly what stays on in an outage.

Sizing a complex on the Chengalpattu yield

Perumbakkam is in Chengalpattu district, where the state rooftop calculator gives about 1,580 units per kW a year. A 20 kW common area system makes about 31,600 units a year, roughly 2,630 a month, against the lifts, pumps, STP and corridor lighting. The common area subsidy is ₹18,000 per kW, so a 20 kW system claims ₹3,60,000. Compare that with your common area bills over twelve months, because generation and load need to match on the same connection. We need those bills before we can size anything.

Independent houses near the lakes

Perumbakkam also has independent houses alongside its flats, and the flood record applies to them just as much. Keep the inverter, distribution boxes and any battery on the terrace or an upper floor, with only the net meter at ground level. At the Chengalpattu yield, a 3 kW system makes about 4,740 units a year. It costs about ₹2,10,000 before subsidy and about ₹1,10,000 after the ₹78,000 central subsidy and the ₹22,000 Tamil Nadu top-up, for an eligible home. Above 4 kW, three-phase supply is needed.