Do microinverters really produce more energy?

On a shaded or multi-orientation roof, yes — commonly 5-25% more across a year, because losses are confined to the affected panel instead of the whole string. On a single unshaded plane the difference is small, sometimes slightly favouring the string inverter on raw conversion efficiency. The gain is a function of your roof, not of the technology.

Are microinverters harder to replace?

Yes. They sit on the racking beneath a module, so replacing one means removing a panel and working at height. The offset is that a failure costs you one panel rather than the entire array, and most carry 25-year warranties against a string inverter's 10-12. Reliability is better; the repair itself is worse.

Can I mix string and microinverters in one system?

On separate arrays, yes — it is reasonably common to put microinverters on a shaded roof plane and a string inverter on a clean one. What you cannot do is mix them within a single string. Each sub-array needs its own interconnection point, so mention this early in your permit and utility application.

String Inverter vs Microinverter: Which One Should You Choose?

One shaded panel drags down a whole string. Microinverters fix that at roughly double the cost — here is when the shade is worth paying for.

A string inverter is one box on a wall converting the DC from an entire row of panels. Microinverters are small units mounted behind each panel, converting to AC at the module. The difference that decides most installations is what happens when one panel is shaded — and how complicated your roof is.

The Christmas-lights problem

Panels wired in series carry the same current, so a string performs roughly like its weakest member. Shade one panel with a chimney at 4pm and the whole string's output drops, not just that panel's share. On a simple unshaded south-facing roof that never happens and a string inverter is fine. On a roof with a chimney, a vent stack, a dormer or a tree, it is a daily loss.

Microinverters break the string entirely: each panel converts independently, so a shaded module only costs you that module. That is the core of the argument, and it is a real one.

The comparison

	String inverter	Microinverters
Cost for 8 kW	$1,200 – $2,200	$2,400 – $3,600
Shade tolerance	Poor — string-level losses	Excellent — per panel
Panel-level monitoring	No (without optimisers)	Yes
Warranty	10 – 12 years typical	25 years typical
Replacement	One accessible box	On the roof, under a panel
Rapid shutdown compliance	Needs optimisers or shutdown devices	Built in
Multiple roof orientations	Needs separate strings/MPPTs	Handles it natively
Efficiency	96 – 98%	95 – 97%

The rapid-shutdown factor that often settles it

Recent NEC editions require module-level rapid shutdown on rooftop arrays, so firefighters can de-energise roof conductors. Microinverters satisfy this inherently — there is no high-voltage DC on the roof to shut down. A string inverter needs DC optimisers or dedicated shutdown devices added at each module, which closes much of the price gap.

So the honest cost comparison on a modern rooftop install is microinverters versus string inverter plus optimisers, not string inverter alone. Once you account for that, microinverters often lose their price disadvantage entirely. Confirm what your jurisdiction's adopted code requires before pricing either — it is covered in the installation guide.

The maintenance trade nobody mentions

A string inverter is one component in an accessible place, and when it fails in year twelve you replace one box. Microinverters distribute that risk — a single failure costs you one panel's output rather than the whole array — but the failed unit is bolted to racking underneath a module on your roof. Higher reliability, much more annoying repair.

For a DIY installer, that argues for microinverters on a roof you would rather not go back onto, and for a string inverter on a ground mount where access is trivial.

Choosing

String inverter — one unshaded roof plane, simple layout, ground mount, or budget is the binding constraint
Microinverters — any meaningful shading, multiple roof orientations, complex roof, or you want panel-level monitoring
String plus DC optimisers — a middle path with per-panel optimisation and rapid-shutdown compliance, keeping one central inverter
Hybrid inverter — a different question entirely: that is about battery backup, covered in hybrid inverters explained

Whatever you choose, size it against your loads rather than your array — how to size an inverter — and check it against your service panel's backfeed limit in the 200A service guide. Target specs for your own system are on the inverter role page.