Common signs include: the inverter display is blank or showing a red fault light, error codes on the display, your monitoring app shows zero generation (on a sunny day), or your electricity bills have suddenly increased. Some inverters also send fault notification emails if they are connected to monitoring. If in doubt, contact us — we can often advise on likely cause before attending.

Inverter replacement costs depend on the brand, capacity (kWp), and model. A standard string inverter replacement (3–5kWp) typically costs £600–£1,200 for the unit plus £200–£400 for labour and certification. Hybrid inverter upgrades cost more. We provide a fixed price after diagnosis, before any work proceeds.

In most cases, yes — as long as the replacement inverter is sized correctly for your panel array and string configuration. Switching brands may require minor wiring adjustments and is sometimes an opportunity to improve performance or monitoring capability. We advise on the most suitable replacement options at the diagnosis stage.

Possibly. Most inverter manufacturers offer 5-year standard warranties, extendable to 10 years. If your inverter is within this period, we can assist with the warranty claim process, including providing fault documentation. Note that warranty claims typically require an MCS-certified installation record from the original installation.

Yes — and this is a popular upgrade path. A hybrid inverter replaces your failed string inverter and adds the capability to connect a battery storage system in the future without any further electrical work. If you are considering adding battery storage in the next 5 years, upgrading to a hybrid at replacement time is typically the most cost-effective approach.

Typically between 1 and 3 days — one day for diagnosis and quotation, and the replacement carried out on a subsequent visit once the new inverter is sourced. For well-known brands with good UK stock availability (SolarEdge, Solax, GivEnergy), we can often have the replacement inverter available within 24–48 hours of the diagnosis visit.

Yes — for systems where the inverter has failed completely and the homeowner has no solar generation, we offer priority inverter replacement appointments. We keep stock of the most common inverter models and can often complete emergency replacements within 24–48 hours in East London postcodes including E1, E2, E3, E14, E15, E16, and E17.

Yes — inverter replacement is an ideal time to expand your solar array. If your existing panels are still in good condition but you want to add capacity, we can install additional panels alongside your new inverter. This is particularly useful if your original installer undersized your inverter relative to your roof space.

We maintain local stock of the most commonly replaced inverter brands including SolarEdge, Solax, GivEnergy, and Growatt. For less common brands like SMA, Fronius, and ABB, we source directly from UK distributors with 2–3 day delivery. We will advise you on stock availability at the diagnosis stage so you know the expected timeline.

Yes — new-generation inverters are typically 2–5% more efficient than models from 10+ years ago. A modern inverter also offers better monitoring, remote fault detection, and often panel-level optimisation (in the case of SolarEdge). While the efficiency gain alone may not justify replacement, it is a welcome benefit when replacement is already required.

For a like-for-like replacement of the same inverter model and capacity, DNO notification is usually not required. However, if you are upgrading to a larger inverter or changing from a string to a hybrid inverter, a DNO notification may be required. We handle all DNO communications as part of our replacement service.