Is Solar and Battery Storage Worth It on the Isle of Man?

Solar PV with battery storage can be worth it on the Isle of Man if you have a suitable roof or land and use a good share of your power at home. Before you buy, get the potential savings, grid dependency and payback period calculated for your property.

Picture two houses on the same road with the same panels on the roof. In one, the family is out at work and school all day, the panels pump out power to an empty house, and by teatime they are back to buying almost everything from the grid. In the other, someone works from home, the washing machine runs at lunchtime and a battery soaks up what is left for the evening. Same kit, very different results.

That is why "is solar worth it?" never has a one-word answer. It depends on your roof or land, how you use electricity and what you want the system to do. Here is how we help people across the Isle of Man work it out before they spend a penny.

Start with How You Use Power

Solar panels make electricity during daylight hours. The power that is most valuable to you is the power you use yourself, because every unit you use from your own panels is a unit you are not buying from the grid.

So the first questions are about your household, not the panels:

• When are you home? If someone is in during the day, more of the solar power gets used as it is made.
• What runs in the daytime? Washing machines, dishwashers and other appliances can often be timed to run when the panels are producing.
• What does your evening look like? If most of your use is after dark, a battery becomes far more important.
• Are things likely to change? A new extension, a growing family or working from home all shift the picture.

Your recent electricity bills are a great starting point. They show how much you use, and that is what any sensible calculation is built on.

Roof, Barn or Ground: Where the Panels Go

The next question is where the panels will sit. We install roof, barn and ground-mounted arrays, and plenty of properties on the island have more than one option.

• House roofs: The most common choice. The direction the roof faces, its pitch and any shading from trees, chimneys or neighbouring buildings all affect how much it will generate.
• Barns and outbuildings: Larger roofs on agricultural buildings or outbuildings can take bigger arrays and keep the house roof clear.
• Ground-mounted arrays: If you have the land, panels in a field or garden can be positioned at the angle and direction that suits them best, without the limits of an existing roof.

Panels still generate in daylight when it is overcast, just less than on a bright day. That is one reason we look at your actual site rather than relying on a rule of thumb.

What a Battery Adds

Without a battery, any solar power you do not use straight away goes back out to the grid. With a battery, that surplus is stored and used later, typically in the evening when the panels have stopped producing and most households use the most power.

We fit battery storage with hybrid inverters. The inverter turns the power from your panels into the kind your home uses and manages the battery, deciding when to charge it and when to draw from it. Having one unit doing both jobs keeps the installation neat and makes it easier to manage.

A battery is not right for everyone. If you are home all day and already use most of what the panels make, the extra cost may not pay its way. If your home sits empty until the evening, it can make a real difference to how much of your own power you actually use.

Cost, Savings and Payback

The cost of a solar and battery system depends on the number of panels, whether you add a battery, and how and where the array is mounted.

Every property is different, so before you commit we calculate three things for yours:

• Potential savings: How much less you are likely to buy from the grid, based on the system size and how you use power.
• Grid dependency: How much of your electricity will still come from the grid once the system is running, with and without a battery.
• Payback period: Roughly how long it will take for those savings to cover the cost of the system.

If the numbers do not stack up for your home, we will tell you. A system that looks good in a brochure but does not suit your property is no good to anyone.

Questions to Ask Before You Buy

Whoever you speak to, these questions will help you compare quotes properly:

• Have the savings been worked out for my property? A figure based on your own usage and site is worth far more than a general estimate.
• Do I need a battery, and how big? Ask what the system looks like with and without one.
• Is my consumer unit up to it? Adding solar and storage means connecting new equipment to your installation, so the board needs to be in good condition.
• What does the price include? Panels, mounting, inverter, battery, wiring, isolators and testing should all be clear.
• What guarantee comes with the work? Our workmanship is covered by a 12-month guarantee, and our quotes are free and valid for 30 days.

Frequently Asked Questions