Balcony Solar Kit 800W with 2.24 kWh Storage
Balcony PV kit with Marstek B2500 2.24 kWh storage and Marstek M2-800 800 W AC microinverter with 2 MPPTs. The microinverter is declared compliant with CEI 0-21.
Italy regulatory note: this system must not be described as “Plug & Play” under CEI 0-21, which reserves that category for systems with nominal power ≤350 W. Any use of ARERA's Comunicazione Unica must be checked on the final PV configuration; the TICA threshold is nominal plant power <800 W.
This balcony PV kit with storage includes two photovoltaic modules, a Marstek M2-800 microinverter and a Marstek B2500 2.24 kWh battery.
Marstek M2-800 microinverter
The M2-800 is a single-phase microinverter with 800 W maximum AC output, 2 independent MPPTs, 60 V maximum DC voltage, IP67 protection and monitoring. The manufacturer states 96.5% maximum conversion efficiency and MPPT efficiency up to 99.8%. The model is listed as compliant with CEI 0-21.
Important: 800 W inverter output does not automatically mean simplified connection
For Italian TICA and ARERA Comunicazione Unica rules, eligibility must not be assessed from inverter AC power alone. For a photovoltaic plant, the nominal plant power is determined according to ARERA definitions from the rated power of the installed PV modules. The simplified procedure applies to plants with nominal power below 800 W, not equal to 800 W.
Therefore, the total rated power of the modules actually supplied and the final plant configuration must be checked before relying on the simplified procedure. CEI 0-21 compliance of the microinverter is necessary but does not by itself make the plant automatically eligible.
Not “Plug & Play” in the Italian regulatory sense
CEI 0-21:2026-07 defines Plug & Play generation systems as systems with nominal power ≤350 W and direct plug connection to a dedicated socket arranged according to the standard. A system of this size must therefore not be marketed as P&P under Italian rules.
Main specifications
| Microinverter | Marstek M2-800 |
| Maximum AC output | 800 W |
| MPPT | 2 independent |
| Maximum DC voltage | 60 V |
| Maximum inverter efficiency | 96.5% |
| MPPT efficiency | up to 99.8% |
| Ingress protection | IP67 |
| Storage | Marstek B2500, 2.24 kWh |
| PV modules | 2 modules; check the rated power of the supplied configuration |
| Microinverter compliance | CEI 0-21 |
Connection and documentation
The kit may include an AC cable with Schuko plug, but the presence of a plug does not turn an 800 W system into a CEI 0-21 Plug & Play system. Connection to the customer's electrical installation, protections, circuit and distributor requirements must be checked for the actual configuration. Depending on the case, the distributor may require the CEI 0-21 declaration, final single-line diagram, installation declaration of conformity and the applicable operating regulation/notification form.
