5 Mistakes Businesses Make When Going Solar (And How to Avoid Them)

Businesses make 5 mistakes when going solar, and we’re here to clear up how to avoid them! Solar panels for business premises are everywhere right now, and for good reason, energy costs have gone up, and generating your own power just makes sense. 

But here's the thing: not every business gets it right the first time; some end up with an undersized system, others choose the wrong installer, and a few don't even realise they qualified for a grant until it's too late.  

So, before you sign anything, let's go through the most common mistakes UK businesses make when installing commercial solar panels, and how you can steer clear of them.

Mistake #1: Not Getting a Proper Energy Audit First

A lot of business owners jump straight to "how many panels do I need?" Without understanding their energy consumption patterns, this isn’t the right approach. 

Before any commercial solar panel installation, you need a clear picture of how much electricity your business uses, when you use it, and where the biggest draws are. A proper energy audit gives your installer the data they need to design a system that actually matches your needs, not one that's guessed at. 

Skip this step, and you risk ending up with a solar PV system that's either too small to make a dent in your bills or oversized in a way that wastes your budget.

Mistake #2: Choosing the Cheapest Quote Without Checking Credentials

Solar is a competitive industry, and that's bringing a flood of installers into the market, and not all of them good.

Going with the lowest quote might feel like the smart financial move, but it can backfire badly if the installer cuts corners on equipment quality or workmanship.

Always check that your commercial solar panel installer is MCS certified (Microgeneration Certification Scheme), since this affects your eligibility for certain incentives and warranties. Ask for references from other commercial clients, not just residential ones, commercial solar installations are a different beast entirely.

Mistake #3: Ignoring Roof Condition and Structural Load

This one catches a lot of businesses off guard, ignoring roof conditions and structural load, especially with roofs that weren't always built with the extra weight in mind. This means repairs or reinforcement are essential, and it’s far cheaper to sort it out before installation than after. 

A good installer will assess structural load capacity as part of the site survey, and if yours doesn't mention it at all, that's a red flag worth asking about.

Mistake #4: Overlooking Battery Storage

Plenty of businesses install commercial solar panels and stop there, without considering solar battery storage. The problem is, most businesses use more electricity during the day when demand is high, but they also generate excess solar energy during quieter hours. Without storage, that extra energy often just gets sold back to the grid for a fraction of its value. 

Adding battery storage lets you store that unused energy in a battery storage system (BESS) and draw on it during peak times or after the sun goes down, which can significantly boost your overall savings over time. 

Mistake #5: Missing Out on Government Grants and Tax Relief

Financial support still exists for businesses installing solar, from the Annual Investment Allowance (AIA) to various regional grant schemes, but a surprising number of businesses never claim it because they don't know it exists.

This is where working with an experienced commercial solar panel installer really pays off, since they usually know exactly what's available and how to apply. 

Don't assume you're not eligible! Ask directly and get it in writing before you commit to anything. 

So, What Should You Do Instead?

Here's a simple checklist to keep your solar project on track:

• Get an energy audit before requesting quotes
• Compare at least three MCS-certified installers
• Ask specifically about roof condition and structural suitability
• Discuss battery storage options, even if you don't install it right away
• Ask about grants, tax relief, and financing options upfront

Commercial solar panels can genuinely transform how much a business spends on energy, but only when the project is planned properly from day one. Rushing into it or cutting corners to save a bit of money upfront tends to cost more in the long run.

What could your organisations next steps be?

Going solar is one of the better long-term decisions a business can make right now, but we wouldn’t recommend rushing into blindly. 

Take the time to understand your energy needs, vet your installer properly, and make sure you're not leaving any grants or incentives on the table.

For businesses looking for straightforward, honest advice on commercial solar panel installation, it's worth reaching out to specialists like Excel Energy, who work with commercial clients across the UK.