Photovoltaic assembly for installation on a sloped roof, comprising • a plurality of photovoltaic modules (1a, 1b,...), arranged in at least one column parallel to the slope, each photovoltaic module (1a, 1b,...) comprising: ▪ a laminate of rectangular shape, with two slope sides to be placed parallel to the slope of the roof and two horizontal sides to be placed perpendicular to the slope, ▪ a plurality of photovoltaic cells, disposed in the laminate, ▪ at least two monopole junction boxes (15a, 15b) arranged on the side facing the sun of the photovoltaic modules and comprising a first junction box attached respectively at the corner between one of the first or second slope side and a first horizontal side, and a second junction box attached at the corner between the same first or second slope side and the second horizontal side, connected to the photovoltaic cells, the junction boxes (15a, 15b) of the photovoltaic modules (1a, 1b,...) being close to the same slope side of the photovoltaic modules (1a, 1b,...), • connection cables, spanning between the second junction box of a photovoltaic module (1a, 1b,...) and the first junction box of the next photovoltaic module (1a, 1b,...) in the photovoltaic module column, • collecting cables, configured to connect the photovoltaic modules (1a, 1b,...) to an electric collector. • a plurality of photovoltaic modules (1a, 1b,...), arranged in at least one column parallel to the slope, each photovoltaic module (1a, 1b,...) comprising: ▪ a laminate of rectangular shape, with two slope sides to be placed parallel to the slope of the roof and two horizontal sides to be placed perpendicular to the slope, ▪ a plurality of photovoltaic cells, disposed in the laminate, ▪ at least two monopole junction boxes (15a, 15b) arranged on the side facing the sun of the photovoltaic modules and comprising a first junction box attached respectively at the corner between one of the first or second slope side and a first horizontal side, and a second junction box attached at the corner between the same first or second slope side and the second horizontal side, connected to the photovoltaic cells, the junction boxes (15a, 15b) of the photovoltaic modules (1a, 1b,...) being close to the same slope side of the photovoltaic modules (1a, 1b,...), ▪ a laminate of rectangular shape, with two slope sides to be placed parallel to the slope of the roof and two horizontal sides to be placed perpendicular to the slope, ▪ a plurality of photovoltaic cells, disposed in the laminate, ▪ at least two monopole junction boxes (15a, 15b) arranged on the side facing the sun of the photovoltaic modules and comprising a first junction box attached respectively at the corner between one of the first or second slope side and a first horizontal side, and a second junction box attached at the corner between the same first or second slope side and the second horizontal side, connected to the photovoltaic cells, the junction boxes (15a, 15b) of the photovoltaic modules (1a, 1b,...) being close to the same slope side of the photovoltaic modules (1a, 1b,...), • connection cables, spanning between the second junction box of a photovoltaic module (1a, 1b,...) and the first junction box of the next photovoltaic module (1a, 1b,...) in the photovoltaic module column, • collecting cables, configured to connect the photovoltaic modules (1a, 1b,...) to an electric collector.