String vs micro-inverter — the honest comparison

Your inverter is the brain of your solar system. It converts the DC output of your panels into the AC power your home uses. Choose the wrong type, and you leave energy — and money — on the table every single day.

There are two main approaches: string inverters and micro-inverters. Each has genuine strengths and real trade-offs. Let us be honest about both.

String inverters

A string inverter connects to multiple panels wired in series (a "string"). The inverter optimises for the entire string, not individual panels.

How it works: Panels are connected in a chain. The inverter sees the total voltage and current of the string and converts it to AC. If one panel is shaded, it limits the current for the entire string — the "Christmas light effect."

Pros: - Lower cost: ₹30,000–₹60,000 for a 5 kW inverter - Proven technology with 10–15 year track record - Single point of installation and maintenance - Higher overall efficiency when all panels receive equal sunlight - Compatible with battery storage (hybrid models available)

Cons: - Shading on one panel reduces output of the entire string - No panel-level monitoring (unless you add optimisers) - Single point of failure — if the inverter dies, the whole system goes down - Less flexible panel layout — panels in a string must face the same direction and have the same tilt

Micro-inverters

A micro-inverter is a small inverter mounted behind each individual panel. Each panel operates independently, converting its own DC to AC.

How it works: Every panel has its own inverter. If one panel is shaded, only that panel's output drops — the others continue producing at full capacity. Output from all micro-inverters is combined at the AC bus.

Pros: - Panel-level optimisation — each panel operates at its own maximum power point - Shading on one panel does not affect others - Panel-level monitoring — you can see exactly which panel is underperforming - More flexible layout — panels can face different directions with different tilts - No single point of failure — if one micro-inverter fails, the rest keep producing

Cons: - Higher cost: ₹5,000–₹8,000 per panel (₹30,000–₹48,000 extra for a 6-panel system) - More components on the roof — each one is a potential point of failure - Harder to service — requires roof access to replace a failed unit - Most micro-inverters are not compatible with DC-coupled battery systems - In hot climates, roof-mounted electronics can run hot, potentially shortening lifespan

The shading question

This is the deciding factor for most installations.

If your roof has zero shading from 9am to 4pm year-round: A string inverter will give you the same total energy as micro-inverters, at lower cost and with simpler maintenance. There is no performance advantage to micro-inverters in this scenario.

If your roof has partial shading (chimney, vent pipe, neighbouring building, tree): Micro-inverters can recover 5–25% of the energy that a string inverter would lose. For a 5 kW system losing 15% to shading, that is roughly ₹8,000–₹12,000 per year in recovered energy — paying for the micro-inverter premium within 3–5 years.

If your roof has multiple orientations (e.g., east + west): Micro-inverters let each panel track its own peak independently. A string inverter would need two separate strings and a dual-MPPT model, which narrows the cost gap.

Hybrid string inverters — the middle ground

Modern hybrid string inverters with dual MPPT (Maximum Power Point Tracking) can handle two independent strings, each facing a different direction. Add panel optimisers (like SolarEdge) to a string system, and you get panel-level monitoring and shade management without switching to micro-inverters.

This is increasingly our recommendation for Indian rooftops: a dual-MPPT hybrid inverter with optimisers on shaded panels only. You get most of the shade benefit at a fraction of the full micro-inverter cost, plus battery compatibility.

Our recommendation

• •Clean, unshaded roof, single orientation: String inverter. Save the money.
• •Partial shading or multiple orientations: Dual-MPPT hybrid inverter + selective optimisers.
• •Heavy, complex shading: Full micro-inverter system. The energy recovery justifies the cost.
• •Adding battery storage: Stick with a hybrid string inverter. DC-coupled batteries are significantly more efficient than AC-coupled alternatives.

At BrightBeam, we stock PowerHub hybrid inverters with dual MPPT and Wi-Fi monitoring, plus optimiser add-ons for shaded panels. We assess your roof during the free site survey and recommend only what you actually need — nothing more.