Home / Guides / Inverters Compared

Solar inverter types compared: string, hybrid, off-grid & micro

"Which inverter is best" is the wrong first question — it's really "which inverter type fits how I use electricity." Brand and model matter, but the type you need is set by your grid reliability and whether you want battery backup. Here's how the four main types actually differ.

String (on-grid) inverters

One central inverter handles the output of an entire string of panels wired together. This is the simplest, cheapest, and most widely installed type, and it's the natural fit anywhere grid power is reliable and net metering is available — the grid does the job a battery would otherwise do. The trade-off is that string inverters shut down automatically during a grid outage, by design, so they can't back-feed power into lines utility crews may be working on. If outages are rare where you live, this is usually the best value per kW installed.

Hybrid inverters

A hybrid inverter manages solar input, battery charging and discharging, and grid import/export all through one device. Many are sold "battery-ready" — you can install one now and add batteries later without swapping the inverter — which is a big part of their appeal in areas with unpredictable outages: you get net metering economics most of the time, and battery backup on the days it actually matters. This flexibility, plus the added electronics, is why hybrids typically cost noticeably more than an equivalent string inverter.

Off-grid inverters

Built for locations with no grid connection at all, off-grid inverters and their battery banks have to be sized to carry the full household load through nights and cloudy stretches on their own, with no fallback. That means more battery capacity, more conservative sizing margins, and a higher total cost than a grid-connected system of the same panel wattage. Off-grid only makes sense where there genuinely is no reliable grid to connect to — using it purely as a backup strategy where hybrid would work is usually overspending.

Microinverters

Instead of one central inverter, a small inverter is fitted to each individual panel. The main advantage is that shading or a fault on one panel doesn't drag down the output of the whole string — each panel operates independently, which also makes panel-level monitoring straightforward. That granularity comes at a higher cost per watt and more electronics on the roof itself, so microinverters are most often chosen for roofs with partial shading or complex angles rather than as a default choice.

What to actually check before buying, beyond the brand

• Efficiency rating. Quality inverters across brands typically land in a 96–99% conversion efficiency range — a percentage point matters less than warranty and support.
• Warranty length. 5 years is standard; 10 or more is increasingly common on hybrid models and worth prioritizing, since the inverter is the component most likely to need service over the system's life.
• MPPT count. More independent MPPT (Maximum Power Point Tracking) inputs let the inverter handle panel strings facing different directions or under different shading without dragging each other down.
• Surge / overload handling. Check the rated surge capacity against the peak load you calculated above — this is exactly what the calculator's inverter sizing figure is for.
• Local service network. An inverter with excellent specs but no local support or spare parts is a worse practical choice than a slightly less efficient one your installer can service quickly.
• Net metering / grid-code approval. Confirm the specific model is approved by your local utility for grid export before you buy — this varies by country and even by region.

Established manufacturers commonly available across South Asian, Middle Eastern and global markets include Huawei, Growatt, Sungrow, Solis, GoodWe, SMA and Fronius, among others — all make both string and hybrid models. Rather than chasing a single "best" brand, match the type to your grid situation first, then compare specific models on the checklist above.