Sunsynk Solar Storage Battery Review

Our Sunsynk review is a 10-minute read.

If you’re stuck for time, bookmark this page for later, and read our quick overview below instead.

Overview: Our Sunsynk Battery Review 

If you’re deciding what size Sunsynk battery to buy, you’ll see in our review it’s best to: 

• Buy the smallest possible battery if you want the ultimate balance of cost, self-sufficiency and a short payback period
• Buy the largest storage battery possible if you want the highest levels of self-sufficiency possible (protecting yourself from ever rising energy costs)

Depending on which battery you choose you’ll be looking at electricity bill savings of £712/yr to £747/yr, using a battery combined with a 5.16kWh 12-panel setup. This is based on a household consuming 3,900kWh of electricity per year.

Naturally, the bigger the battery, the higher the cost. Our Sunsynk batteries (including installation by an MCS professional) are priced at £2,495-£4,995.

If investing in a solar battery seems like the right choice, Sunsynk is an excellent option. We featured it in our list of the best solar batteries here. 

With excellent reviews on Trustpilot, a long 10-year warranty and flexibility thanks to their Logger Battery App, Sunsynk continues to be one of the most popular battery brands we install. 

Get your solar panel system spec’d specifically for your property, inclusive of a suitable storage battery, using our solar panel tool here. 

Sunsynk Battery Review

What Size Sunsynk Battery Do You Need?

Solar panel batteries are expensive, so choosing the right size unit is a balance of cost, energy savings and self-sufficiency. In this part of the review, we’ll focus on what size Sunsynk battery you need.

If your focus is on the fastest return on investment, use a small Sunsynk battery, such as the 5.3kWh priced at £2,495... 

A property using 3,900kWh of electricity per annum would need a system like this, a 12-panel 5.16kWh setup:

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The return on investment using different battery types is as follows: 

However, if your focus is on maximising self-sufficiency and protecting yourself from rising energy bills, you’ll want the biggest unit possible; a 10.6kW or 15.9kW. 

Electricity bills rarely go down, as highlighted here by Statista. The average UK electricity bill rose from £539 to £1,152 from 2010-2023. 

The higher your level of self-sufficiency thanks to using a Sunsynk solar battery, the better you protect yourself from rising energy costs. And as energy costs do rise, you’ll find your payback period drops over time too. 

Here are the varied levels of self-sufficiency using different sized batteries for a 3,900kWh consumption household: 

Use our clickable solar panel tool here. You can play around with different battery options to determine the best balance of cost, self-sufficiency and payback period.

How Much Will You Save With A Sunsynk Battery?

Using a Sunsynk solar storage battery in conjunction with your solar panel setup is going to save you £100s per year on your electricity bills.

Back to our example of a 3,900kWh consumption household, we’d expect to see savings of around £712 per year using a small 5.3kWh battery. 

This rises to £744 per year using a medium sized solar battery (10.6kWh) and £747 per year using a large storage battery (15.9kWh).

Use our clickable solar panel configuration tool here…

There, you’ll be able to determine both the cost of the battery and how much you’ll save on your electricity bills. This will vary depending on your household’s electricity consumption.

Sunsynk Battery Costs

Sunsynk is a leading brand in the solar storage battery industry. Yet, their prices sit in the mid-range, which represents excellent value for money. 

It’s worth mentioning at this point the prices below are subject to 0% VAT. The government has introduced a 0% VAT scheme until early 2027 on a range of energy saving materials, including solar batteries. 

However, you’ll need this fitted by a MCS registered installer, and the items you buy can’t be purchased secondhand. Secondhand units and those not fitted by an MCS engineer, won’t be eligible under the 0% VAT scheme (you’ll be paying 20% instead).

All our fitters are MCS registered, so any price you see using our solar panel tool accounts for this 0% VAT scheme.  

Prices for Sunsynk batteries at time of writing, including installation from an MCS registered engineer, are: 

As you can see, the prices for solar batteries vary considerably; the bigger the storage battery is (in kWh), the higher the price. 

Our 2-minute clickable solar panel tool allows you to flick between small, medium and large battery options. You’ll be able to see the difference in: 

Online Sunsynk Reviews

Before investing thousands of pounds in any product, you need to do your research. Luckily, there are various websites where you can check for customer reviews. 

One of the biggest is Trustpilot. Checking for online customer reviews helps to get a gauge on what a company is like, including: 

• Quality of their products
• Prices compared to competitors
• After-sales care when consumers need to use their warranty

If you compare Sunsynk reviews on Trustpilot compared to many other leading brands, you’ll see their reviews are above-par. 

Not only do they have an overall star rating of 4.6, but 83% of customer reviews are rated 5-star. 

Warranty

Alongside online reviews, another important thing to consider when buying a solar storage battery, is warranty.

With a cost of £2,495-£4,995, you’ll want to ensure you’re covered for as long as possible. 

Typical battery warranties sit in the region of 2-5 years. In our opinion, that’s simply not enough insurance to protect your £2,495-£4,995 investment; a 5-year warranty would be the absolute minimum we’d be looking for when purchasing a solar storage battery. 

The majority of the Sunsynk battery range comes complete with a 10-year warranty. And all you’ll need to do to get this warranty, is to use their online warranty registration form here. 

We supply, fit and register Sunsynk battery warranties on behalf of our customers. 

Simply use our solar panel tool to get a fixed price on your system, and we’ll do the rest!

Connect App

The next part of our Sunsynk battery review will focus on the impressive Sunsynk Logger App. This app is designed so you're able to get the most out of your battery, and solar panel system as a whole.

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With the Logger App you'll be able to: 

The Sunsynk Logger App is available on both the Android and Apple store (free of charge): 

• Logger App for Android devices
• Logger App for Apple devices

And that's it for our Sunsynk battery review!

Get quotes for a solar panel system using a Sunsynk battery using our easy to use and clickable solar panel configuration tool here. 

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