Abstract: A method for installing a maximum power point tracking (MPPT) controller is provided. The method includes acquiring an occlusion area proportion of a photovoltaic string in a photovoltaic system, optimizing the occlusion area proportion to generate a target occlusion area proportion, determining a target position from the photovoltaic string according to the target occlusion area proportion, and installing the MPPT controller at the target position.

Abstract: The photovoltaic cell sheet includes: a cell sheet body having a first end and a second end opposite to each other in a width direction of the cell sheet body, wherein the first end of the cell sheet body is provided with a plurality of sawtooth spacing along a length direction of the cell sheet body; a first main gate arranged at one side of front and back sides of the plurality of sawtooth and serving as a first electrode; and a second main gate arranged at another side of the front and back sides of the cell sheet body and serving as a second electrode, wherein the second main gate is adjacent to the second end of the cell sheet body.

Abstract: A method for installing a maximum power point tracking (MPPT) controller is provided. The method includes acquiring an occlusion area proportion of a photovoltaic string in a photovoltaic system, optimizing the occlusion area proportion to generate a target occlusion area proportion, determining a target position from the photovoltaic string according to the target occlusion area proportion, and installing the MPPT controller at the target position.

Abstract: The disclosure provides a method for preparing an electrode film layer on a surface of a solar cell substrate. The method includes: a) obtaining a metal electrode material melt by heating and melting a metal electrode material under a vacuum condition; b) bombarding the metal electrode material melt with an ion source at low energy, so that it is sputtered and deposited on the surface of the solar cell substrate to form the electrode film layer; in which the energy of low energy bombarding is 30 eV to 80 eV.

Abstract: An in-situ flash evaporation film forming apparatus for a perovskite solar cell includes a platform; a substrate disposed on the platform and configured to form a film layer; and a cavity cover movably disposed up and down on the platform, and being able to enclose the substrate into a closed cavity surrounded by the cavity cover and the platform, a vacuum pipe being disposed on the cavity cover and being able to communicate the closed cavity with a vacuum pump.

Abstract: An additive used in catalytic cracking of hydrocarbons, which is in the form of homogeneous liquid and comprises a composite metal compound, wherein said composite metal compound consists of the oxides, hydroxides, organic acid salts, inorganic acid salts or metal organic complex compounds of at least one of the 1st group metals and at least one of the 2nd group metals, wherein the 1st group metals are selected from the group consisting of the metals of the IIIA, IVA, VA, VIA groups of the Element Period Table, boron, silicon, phosphorous and tellurium; wherein the 2nd group metals are selected from the group consisting of alkali-earth metals, transition metals, and rare earth metals, is disclosed. A process of catalytic cracking of hydrocarbons, utilizing the additive is also disclosed. The additive can passivate metals and promote the oxidation of CO, and is operated easily with production cost decreased.

Abstract: An additive used in catalytic cracking of hydrocarbons, which is in the form of homogeneous liquid and comprises a composite metal compound, wherein said composite metal compound consists of the oxides, hydroxides, organic acid salts, inorganic acid salts or metal organic complex compounds of at least one of the 1st group metals and at least one of the 2nd group metals, wherein the 1st group metals are selected from the group consisting of the metals of the IIIA, IVA, VA, VIA groups of the Element Period Table, boron, silicon, phosphorous and tellurium; wherein the 2nd group metals are selected from the group consisting of alkali-earth metals, transition metals, and rare earth metals, is disclosed. A process of catalytic cracking of hydrocarbons, utilizing the additive is also disclosed. The additive can passivate metals and promote the oxidation of CO, and is operated easily with production cost decreased.