Maximizing Solar Energy Efficiency with EcoFlow Stream Microinverters: Managing Excess Generation

In my recent exploration of the EcoFlow Stream Microinverter, an 800W plug-in solar device that converts the output of two solar panels into AC power for residential use, I delved into the topic of wiring panels in series or parallel with the Stream Microinverter to understand the electrical limits of the two MPPT inputs. Building upon that, I am now addressing a common query that people have been posing to me: what happens to the excess electricity you generate but do not utilize?

It is indeed a valid question as it significantly impacts the economic aspect of such a system. Some individuals have even raised the opposite concern – they do not possess a battery or an export agreement and wish to cease their system from feeding power back into the grid entirely. I will be covering both scenarios, along with the necessary paperwork, including the G98 notification and the potential consequences of disregarding it.

Where does the excess actually go?

A grid-tied microinverter like the EcoFlow Stream is designed to synchronize its output with the mains and supply power to a home’s wiring. The generated power is first utilized by the appliances within the house, with any surplus electricity flowing out through the electricity meter and into the local distribution network. The grid can easily accommodate the surplus power from a small system like this without any issues.

However, the issue lies more in the financial realm than the technical one. In the absence of an export tariff, every unit of electricity that leaves your property is essentially given away for free. Your import meter ceases counting while you export, and you do not receive any compensation for the excess power. This was evident in my own testing, where the discrepancy between my electricity generation and usage was clear.

Can you get paid for exported electricity?

While it is theoretically possible through the Smart Export Guarantee (SEG) that mandates licensed suppliers with a certain customer base to offer tariffs for exported electricity, in practice, a plug-in system is unlikely to qualify for such payments. To be eligible for a SEG tariff, the system must be installed by an MCS certified installer using certified products, have a smart meter registered for export recording, and comply with the G98 notification requirements, among others.

For a self-installed plug-in system, meeting these criteria is improbable, thus exporting surplus electricity from such a system typically does not yield any financial benefits. The primary focus with a system of this size should be on maximizing self-consumption rather than chasing export payments.

The G98 notification

Regardless of whether you export electricity or not, any grid-tied generator in the UK must be notified to the Distribution Network Operator through the G98 process. This process involves informing the DNO within 28 days of the installation, and it is essential for grid management purposes to track the generation in each area accurately.

G98 is more of a fit-and-inform process rather than a gate for approval, and it is crucial to comply with this requirement to avoid potential issues in the future. Failure to submit the G98 notification can lead to complications with insurers, property sales, and future electrical work.

Does exporting without a G98 get you into trouble?

While there isn’t an immediate repercussion for exporting without a G98 notification, it can lead to problems down the line. If the DNO discovers unregistered generation during an investigation or if you encounter issues with insurance claims or property transactions, the absence of a G98 record can pose significant challenges. Therefore, it is advisable to complete the G98 notification process to ensure proper compliance and avoid any potential complications.

How to stop your system exporting at all

Some individuals prefer to prevent their system from exporting electricity altogether, particularly if they do not have a battery or SEG eligibility. This can be achieved through various methods, such as adjusting the output limit in the EcoFlow app, integrating smart plugs to match consumption with generation, or investing in a battery solution like the Stream Max, Stream Ultra, or Stream Ultra X.

Configuring the system to eliminate export does not exempt it from the G98 requirement, as the notification is essential for all grid-tied generators regardless of their export status.

Final thoughts

The surplus electricity generated by a plug-in system gets distributed through the grid, and without the necessary qualifications, you do not receive any compensation for the exported power. This underscores the importance of focusing on self-consumption to maximize the benefits of such a system. Additionally, ensuring compliance with the G98 notification process is crucial to avoid potential complications in the future.

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Author Bio:

I am James, a technology enthusiast based in the UK and the Editor and Owner of Mighty Gadget, a tech blog that I have been running since 2007. My passion for technology spans various domains, from computers and networking to mobile devices, wearables, and smart home technologies. With a keen interest in fitness-related tech, I also cover this niche extensively on my blog.

I hold a BSc in Information Systems Design from UCLAN and a Master’s Degree in Computing, providing me with a unique perspective on technology blogging. I aim to deliver engaging and informative content to my readers, leveraging my diverse interests and expertise in technology.

For more updates, you can connect with me on Twitter, Instagram, Facebook, LinkedIn, and Strava.

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