Split PV Module Shutdown Circuit to Cut Cable Losses
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Solution Overview
Problem
Existing photovoltaic systems require additional extension cables and terminals for shutdown apparatuses, increasing cable length and losses, which is inefficient and costly.
Innovation Solution
A shutdown apparatus for photovoltaic modules is designed with two parts connected via a cable, allowing for series connection without additional extension cables, reducing total cable length and losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shutdown apparatus is arranged in the photovoltaic system, then safety is improved, but cable length and cable losses increase
Solution Approach 1:
The shutdown apparatus is divided into two separate parts: a first part connected to the positive electrode and a second part connected to the negative electrode. This segmentation allows each part to be independently installed near the photovoltaic module terminals, eliminating the need for long extension cables while maintaining the shutdown function.
Solution Approach 2:
A cable connects the first part and second part of the shutdown apparatus, serving as an intermediary element. This internal cable is much shorter than the external extension cables previously needed, as it only needs to bridge the two parts of the shutdown apparatus rather than extending from the module to a remotely located shutdown device.
2Reliability
If a shutdown apparatus is arranged in the photovoltaic system, then safety is improved, but cable cost increases
Solution Approach 1:
By segmenting the shutdown apparatus into two parts that can be independently installed near the photovoltaic module, the patent eliminates the need for long extension cables and additional terminals, thereby reducing the quantity of cable material required and lowering overall cable cost.
3Reliability
If additional extension cables and terminals are used for shutdown apparatus, then shutdown function is achieved, but installation time increases
Solution Approach 1:
The segmented design allows the first and second parts of the shutdown apparatus to be independently installed and connected directly to the positive and negative electrodes respectively, eliminating the need to install additional extension cables and terminals. This streamlined installation process significantly reduces installation time.
4Reliability
If additional extension cables and terminals are used for shutdown apparatus, then shutdown function is achieved, but device complexity increases
Solution Approach 1:
The patent divides the shutdown apparatus into two functional parts that can be independently installed and connected, eliminating the need for additional extension cables and terminals. This segmentation simplifies the overall device structure and reduces the number of components required.
Data Source
AI summary
A shutdown apparatus for a photovoltaic module, and a photovoltaic system. The shutdown apparatus includes: a first part and a second part; the first part or the second part includes a shutdown circuit; and the first part and the second part are connected via a cable; the first part includes a negative input terminal and a negative output terminal, and the second part includes a positive input terminal and a positive output terminal; the negative input terminal and the positive input terminal are respectively used for connecting to a negative electrode and a positive electrode of a corresponding photovoltaic module; and the positive output terminal and the negative output terminal are respectively used for being connected in series to different shutdown apparatuses.