Why the inverter type matters more than the brand
The inverter converts DC power from your panels into the AC electricity your home uses, manages grid export, and in hybrid systems controls your battery. Choosing the wrong type — say, a plain string inverter for a shaded roof, or an off-grid system where net metering was possible — can cost you lakhs in lost generation or missed subsidy over 25 years. The right type depends on three things: your roof's shading, whether you need battery backup, and whether an EB connection exists at your site.
String inverters: the best value for most roofs
A string inverter sits on a wall and handles a whole string of panels at once. It is the cheapest, most proven option and is fully eligible for the PM Surya Ghar subsidy. Its one weakness is shade: if one panel in a string is shadowed, the whole string's output drops. For the shade-free terraces most Trichy homes have, a string on-grid system is almost always the best value. Our first-choice brand is Sungrow, followed by Growatt, SolarEdge, Feston, Deye, Polycab and Havells.
Micro inverters and power optimizers: for difficult roofs
Micro inverters put a small inverter behind every panel, so each panel works independently — shade on one panel affects only that panel, and you get panel-level monitoring. Power optimizers achieve a similar result with a central string inverter (SolarEdge is the leader here, and we have installed SolarEdge zero-export systems in Trichy). Both cost more than a plain string system, so they are worth it only when your roof has real shading, multiple directions or obstructions like water tanks and chimneys.
Hybrid inverters: when you need battery backup
A hybrid inverter runs your home from solar plus battery during power cuts while still exporting excess power to the grid like an on-grid system. It costs more upfront (inverter plus battery) but is the right choice where power cuts are frequent or backup is essential. We install Deye and VSOLE hybrid systems — our 5 kW VSOLE hybrid with lithium battery in Perambalur is performing well. Note that subsidy rules for hybrid systems differ, so check current PM Surya Ghar eligibility before deciding.
Off-grid inverters: for sites without EB
Off-grid systems work completely independent of the electricity board — ideal for farms, remote houses and rural sites where EB lines do not reach. They need generous battery sizing for cloudy days, cannot export excess power, and are not covered by the rooftop subsidy scheme. For off-grid we trust Eastman and UTL, both proven in Tamil Nadu's rural conditions.
A simple decision rule
Shade-free roof and lowest cost with full subsidy: string on-grid. Shaded or complicated roof: micro inverters or string with optimizers. Need battery backup: hybrid. No EB connection: off-grid. Still unsure? Send us your EB bill and a terrace photo — we will recommend the right type and brand with a written quote, free. Call +91 82205 63848 or read our detailed inverter guide in the Solar Knowledge section.