Sirius SI-4KIT100 Mode D'emploi page 48

6. Configuration of 2 kits in serie
It is possible to connect 2 kits maximum in serie. The connection of 2 kits
in serie requires an AC extension cable (not included).
The ADEME guide for the installation of plug & play self-
consumption kits recommends not exceeding 900W per standard
socket circuit in accordance with current electrical standards (socket
circuit wired in 2.5mm2 copper and protected by a 20A thermal circuit
breaker) to avoid thermal overload.
The distance between every two micro-inverters should meet the length
of AC cables. The length of each AC cable should not exceed 1.4 m.