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This article will cover the main practices when doing electrical design with PVcase fixed tilt system and operating principles behind electrical connections.
In general, there are two actions that can be used to connect strings to electrical devices - Auto generate or Semi-auto generate.
Auto generate connects strings to electrical devices based on user defined configuration and PVcase's automatic algorithm. An example below shows the operating principle of automatic generation when 8 strings are being connected to one string inverter. Color coding indicates the final connections.
The software starts connecting strings from the opposite side to the fame alignment and tries to fill up one full device without having to connect frames from different rows ( 1 ). At the end of the row the algorithm sees that there's a lack of strings for a fully connected device ( 2 ) and keeps them unconnected until it encounters a similar situation on another row ( 3 ). This algorithm results in for the most part evenly connected strings and practically connected left-over strings that are close to the alignment side.
In situations when the amount of strings per device does not divide per frames evenly, electrical connections are made with the same logic - trying to fit a fully connected device per row and leaving out strings. In the example below, a frame holds 4 strings but the combiner box connects 10 strings. In this case, for the most part of the area we have 1 combiner box per row and 1 combiner that connects leftover strings from each row.
Semi-auto generate lets the user assign strings to devices based on their own assessment by requiring to select particular strings for each electrical device. This gives a lot of flexibility in situations when the layout is too complicated or simply not suitable for auto generation (example below).
ⓘ Semi-auto generate works well with AutoCAD layiso command. Using it on module frames leaves only string indications.
Automatic generation algorithm works well for the most part but can introduce these unpractical situations in which combination of auto and semi-auto generation must be used:
1. Frames are connected far from each other.
In some cases auto generation finds missing strings for another connection quite far apart:
In this case, semi-auto generation on some frames and auto generation on rest of the frames can reconfigure the connection:
2. Even connections are intended to be placed from alignment side
When user prefers to leave uneven connections at the opposite side of alignment, auto-generate function should be used in two parts - first step is to use auto generate only on evenly connected frames ( 1 ). Second step is to select the rest of the strings ( 2 ).
Final output is reversely connected area ( 3 ).