What Are Your Proxies for Solar PV System Quality?

The One Small Detail That Defines Quality

In South India, we have a saying—“If you have to check if the rice is cooked, checking one grain is enough.” I’m sure most cultures have a variation of this process.

Why am I talking about carbohydrates in a solar industry article?

My goal is to identify the one piece of equipment or process that best represents top-quality work.

The MC4 Connector—A Small But Crucial Component

My choice goes to the humble connector.

Usually called the MC4 connector, it was named after the company that invented it—Multi Contact (now Staübli) in 2004. The name has become a generic term for this type of product, like Google, Xerox, or Fevicol.

For people outside the industry, the MC4 connector is used to connect two DC cables—either between solar panels or from panels to inverters. It prevents loose connections, ensures system safety, and reduces the risk of electric arcs or fires.

The Hidden Cost of Cheap Components

An MC4 connector costs around $1 per piece, even for the best brands, and accounts for less than 0.001% of the total system cost.

Yet, I often see installers—regardless of size, region, or project scale—choosing the cheapest options available.

That feels crazy to me. These small components barely impact system costs but play a huge role in long-term reliability. Yet, compromises are made.

Invest in Quality Where It Matters Most

My strong recommendation: Always use the best products where cost impact is low but quality impact is high.

What should you measure to see if your rice is cooked well or your pasta is al dente? 🙂

Write in your thoughts. Until next time!

(PS: I’m not sponsored by any company, nor do I have an interest in recommending products—yet. Do your own research.)

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