Many homeowners know they need to embrace the solar revolution, but they're rightly concerned about investment-heavy changes to their property. Recent changes in UK regulations now allow the public to install basic solar installations without major changes to the home's electrical services, in a solution branded as plug-in solar.
A complete plug-in solar kit, powered by a top-tier microinverter like the HiFlow or HiFlow Pro from Hoymiles, provides a solid first step for those who want to reduce electricity costs without major costs or changes to the property. That last point is critical for renters, where permanent changes might not be possible.
For those looking to reduce their monthly electricity charges, what should they be looking for?
What should consumers look for when buying a plug-in solar kit?
The first, somewhat obvious point is that it needs to save you money, because power is becoming more expensive, not less. But all solar solutions should do this to some extent, so what should a solar solution have to make it the one to buy?
1. Find a known brand for the 'heart' of your kit
The old adage that you get what you pay for has never been truer than with solar installations. Choosing a company with a solid track record and a strong understanding of the technology is critical. Hoymiles has been a global provider of solar and energy storage solutions since 2012, serving customers in more than 190 countries and regions.
With more than a decade of experience in residential microinverter technology, you can be confident the equipment has the right specifications and certifications and will help you start your journey on the right foot.
2. Look for convenience
Before the recent regulation changes, all solar installations required experienced electricians to install them, increasing costs and making them unsuitable for renters.
Solutions like the Hoymiles HiFlow and HiFlow Pro range come with a 5-metre UK Type G plug ready to connect to the home (10m and 20m optional). Homeowners no longer need an electrician for installation or a full project-management approach; plug-in solar makes it simple. With a HiFlow or HiFlow Pro microinverter, self-deployment is straightforward, letting you start benefiting from free solar power immediately.
3. Choose compliant solutions
Simply ordering the best-priced panels and microinverters from an online retailer might be a recipe for disaster. What you want is a kit where the panels and microinverter are built to work efficiently and reliably, delivering the power advantages you expect.
It’s worth checking that the kit is listed as compliant on the ENA Type Test Register, not just Individual components. The complete device or kit must comply with the Interim Product Specification and be listed as compliant on the ENA Type Test Register before you place it on the market. And a G98 listing for the microinverter alone does not establish compliance for the complete plug-in kit.
Good sources for compliant kits that use the Hoymiles HiFlow series microinverter include Smith Bros, City Plumbing, Thunder Energy, and InstaGroup.
4. Pick technology that's easy to manage
Once you are up and running, feedback on the system and what it's achieving is paramount. With Hoymiles, the S-Miles Home App provides easy-to-understand monitoring via Bluetooth and over WiFi, showing you exactly what solar power is contributing and when.
Not all solutions give users the tools to monitor and manage system performance in real time, even when away from the property, but the Hoymiles infrastructure does.
Key benefits of Hoymiles solar equipment
- A brand that people know and trust
- Convenient solutions that won't confuse buyers
- Compliant hardware that delivers on the quoted specifications
- A phone app-centric solution that's easy to configure and manage
Hoymiles HiFlow and HiFlow Pro
We’ve already concluded that, as a brand, Hoymiles ticks the experience and track record boxes, so it's time to look at their plug-in solar offerings and why they might be right for you.
The entry-level solution is the HiFlow 800(HF-800-WB), a basic 800W microinverter with a single MPPT that costs around £120. The maximum input voltage is 100V, and the maximum DC input current is 16A. This lets you connect up to two 520W panels in series, as long as the combined voltage and current stay within the quoted ranges.
With up to 97% peak efficiency and a twelve-year warranty, this is a perfect solution for deployments where the two panels are in the same orientation, like on a balcony or wall/fence mounted.
For those with complex scenarios, Hoymiles offers Pro 2-in-1 Series with two MPPT inputs or 4-in-1 models with four MPPTs, substantially increasing the number of panels they can support. These are especially useful when panels are shaded at certain times of day or are in multiple locations.
This hardware is ENA registered and includes the cables you need to connect it to a mains socket.
How much can I save?
The predicted savings, assuming an average UK cost per kWh of 26.35p and a self-consumption rate of 40%, work out to 851.61 kWh and an annual saving of £89.76. That might seem modest, but in the first quarter of 2027 it is predicted to rise to 30.28p per kWh, increasing the annual saving to over £103.
Solar panels are remarkably cheap, with some brands being less than £100 for 465W panels. Even with the mounting hardware or garden frames, the full investment should be returned in around three to four years. That period will be shorter if electricity prices go higher, which seems highly likely.
If you pay more than that amount or add a battery to make more of the power usable, you might save more.
But actual savings depend on the installation location, panel orientation, consumption patterns, and system configuration.
If the baseline power use of the home is less than the generation, which on a good day it probably will be, then unless you have an agreement, the Smart Export Guarantee (SEG) in the UK, then without a battery any excess will be exported to the grid for free.
So, if you plan to go beyond a two-panel system, you might consider an installation where you can earn money for the power you export to the network.
Overall, the Hoymiles HiFlow inverters and their associated accessories deliver a solid foundation for those wishing to deploy a solar solution without excessive investment, something many people should consider.
Beyond the first step
Overall, Hoymiles HiFlow inverters and accessories provide a solid foundation for those who want to deploy a solar solution without a major investment. That makes them precisely the products many people should consider.