Microinverters for plug-in solar compared

A microinverter for plug-in solar should do three things: convert the panels’ direct current into grid-quality alternating current up to the legal cap, disconnect safely when the grid fails and carry the certificates that prove both for your country. Everything else, such as the number of inputs, monitoring and app features, is secondary. This page explains what to look for on a data sheet and how the common designs differ.

The criteria that matter

Criterion	Where to find it	Why it matters
Rated AC output (VA)	data sheet, ‘output’	must not exceed the limit in your country, often 800 VA
Max. output current (A)	data sheet	consistent with the cap; about 3.5 A at 800 VA and 230 V
Number of MPPT inputs	data sheet	one per panel avoids shading losses between panels
Max. input power per input	data sheet	must suit your panels’ rating
Input voltage range	data sheet	panels must stay inside it, also in cold weather
Grid protection and certificates	declaration of conformity, certificates	proves disconnection on grid failure and approval for your country
Monitoring	manual	Wi-Fi, Bluetooth, local access or cloud only
Configurable output	manual	allows setting the limit that applies where you live
Ingress protection	data sheet	outdoor use needs a suitable IP rating
Warranty	manufacturer terms	inverters often carry shorter warranties than panels

Rated output and the 800 VA cap

Most kits sold for European markets today use an inverter rated at 800 VA, matching the limit in Germany and Great Britain. Some models can be configured to lower levels, which matters for countries with a different cap. The reasons behind the limit are explained in the 800 W limit.

Inputs and MPPT

Each input with its own maximum power point tracker (MPPT) optimises one panel independently. With two panels on two inputs, shade on one does not pull down the other. Four-input models allow more panels or panels facing different directions, for example east and west. The total output stays capped, so extra inputs pay off mainly through better morning, evening and winter yield.

Grid protection and certificates

Every grid-tied inverter must switch off when the grid fails, so that it never feeds into a dead network. In Great Britain, small generators must comply with Engineering Recommendation G98; in Germany, the rules are set out in the grid connection standard VDE-AR-N 4105. Ask for the manufacturer’s declaration of conformity and certificates for your country, and be cautious with products that only promise compliance in a product listing. For Great Britain, the legal framework for plug-in devices is the statutory instrument SI 2026/848; see our UK and Ireland rules page.

Monitoring and offline operation

Most microinverters report output to an app. Designs differ in an important way:

• Local access over Wi-Fi or Bluetooth keeps working if the manufacturer’s servers go offline.
• Cloud only means data and sometimes settings depend on an online account.
• Integration with home automation systems is possible for some models through local interfaces; check the manual.

The inverter keeps producing power without an app connection in either case; what you lose is visibility and, sometimes, the ability to change settings.

Common designs

Design	How it works	Typical use
Two-input microinverter	two panels, one inverter, plug to socket	standard plug-in kit
Four-input microinverter	up to four panels or two orientations	larger panel sets behind the same cap
Inverter integrated in a battery	panels charge the battery, its own inverter feeds the socket	all-in-one balcony storage
Battery between panels and inverter	battery passes DC on to an existing microinverter	retrofit to an existing kit

Well-known manufacturers of standalone microinverters for plug-in kits include Hoymiles, APsystems and Deye; several battery makers such as Anker SOLIX, Zendure and EcoFlow build the inverter into their storage units. Their model ranges change often, so read the current data sheet for the exact figures. Storage designs are compared in battery systems compared.

Before you buy

1. Check the legal output limit in your country and whether the inverter can be set to it.
2. Match inputs and input power to your panels.
3. Ask for certificates for your country, not just a CE mark.
4. Decide whether you need local monitoring without a cloud account.
5. Compare warranty periods.

New to the topic? Start with how plug-in solar works.