Solar Inverter Buying Guide India: On-Grid vs Hybrid

The inverter is the brain of your rooftop solar system. Panels make DC power; the inverter turns it into the AC power your home and the grid actually use. Pick the wrong type and you can lose your subsidy and net-metering benefit — so this is the one component worth understanding before you sign.

Here’s the short version. If you want the PM Surya Ghar subsidy and net metering, you need an on-grid (grid-tied) inverter. Most subsidised homes do not need a battery. Choose a hybrid inverter only if power cuts are common and you want backup. Off-grid is for homes with no reliable grid at all — and off-grid does not get net metering.

On-grid vs off-grid vs hybrid

This is the first and most important decision. It affects your bill, your subsidy and your budget.

On-grid exports your extra daytime units to the grid and spins your meter backwards (net metering). It’s the cheapest and most common choice for city homes in Pune, Jaipur or Lucknow. The catch: when the grid goes down, an on-grid inverter shuts off for safety, so you get no backup.

Hybrid does everything on-grid does, plus it charges a battery for backup. You pay more upfront for the battery and a costlier inverter, but you keep the lights and fan running during a cut. Good for areas with regular load-shedding.

Off-grid runs fully on batteries with no grid connection. Since there’s no grid link, there’s no net metering and no subsidy. Only makes sense where the grid is absent or extremely unreliable.

String vs micro inverters

Once you’ve picked the type, there’s the technology choice.

• String inverter — one central box handles a whole “string” of panels. Cheaper, simple, most common for Indian homes. If one panel is shaded, that string’s output can dip.
• Microinverter — a small inverter sits under each panel. Costs more, but shading on one panel doesn’t drag down the rest, and panel-level monitoring is easier. Handy for roofs with a water tank, parapet or tree shadow.

For a clean, unshaded roof, a good string inverter is usually the sensible, value-for-money pick.

Sizing and the DC:AC ratio

Your inverter’s rating (in kW) should roughly match your panel array. Installers often fit a slightly larger panel array than the inverter rating — this is called oversizing, and a common DC:AC ratio is around 1.1 to 1.3. Mild oversizing squeezes more useful output on cloudy mornings and hazy afternoons, because panels rarely hit their peak rating in real Indian conditions.

A rough real-world reference: a rooftop system generates about 4 units per day per kW (roughly 1,400–1,600 units a year per kW). So a 3 kW system makes around 12–15 units a day. Size the system to your annual bill, not just today’s mood — the savings calculator can help you match kW to your monthly units.

A quick example

A Nagpur family using 350 units a month might look at a 3 kW on-grid system. Before subsidy, installed cost is typically **₹55,000–₹75,000 per kW** (indicative 2026 — verify current), so roughly ₹1.65–2.25 lakh. The PM Surya Ghar central subsidy caps at ₹78,000 for 3 kW or more. Payback for a subsidised home is commonly ~3–4 years.

MPPT, monitoring and warranty

MPPT (Maximum Power Point Tracking) is the feature that constantly hunts for the most power your panels can give as sunlight changes. More independent MPPTs (usually 1–2 on home inverters) let you place panels on different roof faces — say east and west — without one side dragging the other down.

Monitoring matters more than people expect. A good inverter shows daily and monthly generation on a phone app, so you’ll notice quickly if output drops. Ask for Wi-Fi/app monitoring and check it works before the installer leaves.

Warranty is your safety net. As a general guide (verify with your brand):

• Panels: ~25-year performance warranty + ~10–12-year product warranty
• Inverters: typically 5–10 years
• Batteries: lithium (LFP) usually lasts longer than tubular lead-acid

Why on-grid is essential for subsidy and net metering

This is where many buyers get confused, so let’s be clear.

• Only on-grid systems qualify for net metering (deemed feasible up to 10 kW for homes under the Electricity (Rights of Consumers) Rules, 2020).
• Only grid-connected, subsidy-compliant systems get the PM Surya Ghar central subsidy — ₹30,000/kW for the first 2 kW + ₹18,000 for the 3rd kW, capped at ₹78,000.
• Panels must be ALMM-listed with DCR (Domestic Content Requirement) cells to qualify. Most subsidised homes use DCR Mono PERC panels.
• Apply for net metering through your DISCOM after installation; approval usually takes ~15–45 days.

One important 2026 note: new PM Surya Ghar registrations closed on 6 June 2026. By mid-2026, 40 lakh-plus homes were solarised and over 1 crore had registered. Don’t rush to register today — instead track your existing application status and watch for the next intake.

Quick buying checklist

• Confirm you want on-grid (subsidy + net metering) unless you specifically need backup.
• Match inverter kW to your array; ask about the DC:AC ratio.
• Check MPPT count, app monitoring, and written warranty terms.
• Insist on ALMM/DCR-compliant panels for subsidy eligibility.
• Compare 3 free quotes on brand, warranty and total ₹/kW before deciding.

Take your time, read the warranty, and never choose on price alone. The cheapest quote often skimps on the inverter — the one part you least want to replace.