Corrigendum: 3 or 4 weeks after installation, the module does not work anymore!
He always load the small-12V 7.2A battery, but the output has blown and is short-juice.
It only served to feed two small GU5.3 5W LED bulbs, for 2 minutes in the evening and ditto in the morning, so really not much.
And of course no turning back because 30 days are exceeded and the seller "Ando ---" refuses the Service Department!