Optimizing Technologies for Solar Energy System : Split Cell Solar Modules

Solar technology is improving across all facets of the typical solar installation. In this article, we’ll discuss half-cut solar cells, a variation on standard silicon solar cells that can help improve solar panel performance.

 

What are half-cut solar cells?

 

Just as bifacial solar panels and PERC solar cells provide small boosts in the efficiencies of silicon solar panels, implementing half-cut cells in solar panels can help improve the power output of a solar panel system. Half-cut solar cells are exactly what their name suggests – they are traditional silicon solar cells that have been cut in half using a laser cutter.

Half-cut cells provide several benefits over traditional solar cells. Most importantly, they offer improved performance and durability. Performance-wise, half-cut cells can increase panel efficiencies significantly. And are more physically durable than the traditional ones; because they are smaller in size, they’re more resistant to cracking.

Due to these advantages, solar panels built with half-cut solar cells have the potential to provide quicker solar payback periods for property owners installing solar energy systems. Especially for installations where shading and limited space are constraining factors, half-cut cells can make a solar panel installation even more worth the upfront cost.

 

How do half-cut solar cells improve panel performance?

There are a few main ways that half-cut cells can boost solar panel output and performance:

1. Reduced resistive losses

One source of power loss when solar cells convert sunlight into electricity is resistive losses or power lost during electrical current transport. Solar cells transport current using the thin metal ribbons that cross their surface and connect them to neighboring wires and cells, and moving current through these ribbons leads to some energy loss. By cutting solar cells in half, the current generated from each cell is halved, and lower current flowing leads to lower resistive losses as electricity moves throughout cells and wires in a solar panel.

 

2. Higher shade tolerance

Half-cut cells are more resistant to the effects of shade than traditional solar cells. This is not due to the cells being cut in half, but rather a result of the wiring methods used to connect half-cut cells in a panel. In traditional solar panels built with full cells, the cells are wired together in rows, known as series wiring. In series wiring schemes, if one cell in a row is shaded and not producing energy, the entire row of cells will stop producing power. Standard panels typically have 3 separate rows of cells wired together, so shade on one cell of one row would eliminate a third of that panel’s power production.

(photo for Wiring scheme for a standard solar panel. Source: www.solarquotes.com.au)

There are three separate “rows” of cells wired together in parallel. 

Half-cut cells are also wired in series, but because panels made with half-cut cells have double the number of cells (120 instead of 60), there are also double the number of separate rows of cells. This type of wiring allows panels built with half-cut cells to lose less power when a single cell is shaded because a single shaded cell can only eliminate a sixth of the total panel power output.