Alectrona
Commercial inverters · over 50 kWpSigen PV M1 three-phase commercial inverters, specified by an engineer-led team for >50 kWp solar, with the maker's shorter track record stated plainly rather than dressed up as bankability.
These are representative example reviews, not yet-collected customer feedback. They are written to illustrate the kind of feedback Alectrona aims to earn and are shown as design placeholders while we gather and verify reviews from our first commercial clients. Alectrona is the commercial solar trading brand of RVTC LTD.
What set Alectrona apart was the documented design pack. We had quotes from three installers, but only Alectrona handed us a full set of drawings, a single-line diagram and a design referencing BS 7671 and the G99 connection process. The whole thing read like an engineering submission rather than a sales brochure. Our M&E consultant reviewed it and signed it off without a single query. That gave the board the confidence to release the capital.
Other firms priced our roof off a satellite image and a desktop guess. Alectrona flew an in-house drone survey, fully insured and flown by a qualified commercial drone pilot, and built a 3D model of the actual roof. It picked up plant, vents and a parapet line that a flat aerial photo had completely missed, which changed the panel layout. I would rather find that out at design stage than on the day the scaffold goes up. The accuracy of that survey is the reason I trusted everything that followed.
As a finance director I was wary of being oversold a system bigger than we could use. Alectrona modelled the array against our actual half-hourly consumption data rather than an annual total, so it is sized to what we genuinely draw on site during the day. They were honest that exporting surplus is worth far less than self-consumption, and built the design around that. The capital case stacked up because the engineering was honest, not because the numbers were inflated.
We were undecided between buying outright, leasing and a PPA. Alectrona laid out all three side by side with the pros and cons of each against our balance sheet, instead of pushing the one that pays them best. They were clear about where a PPA makes sense and where capex wins, and pointed us at our own accountant for the tax treatment. The survey and design took a little longer than I expected, but the thoroughness was worth the wait. Genuinely consultative.
The install crew were tidy and well run, and worked to a clear CDM 2015 plan with a proper site induction and RAMS. What impressed me most was the handover. We received a full commissioning pack with the IEC 62446-1 test results, certification, O&M documentation and an as-built record for our maintenance team. As the people who have to live with this asset for the next twenty years, having that paperwork in order matters enormously. Nothing was left loose.
I expected the usual hard sell and got the opposite. After surveying our site Alectrona told us one roof section was not worth covering because of shading, and that a smaller, well-sited array was the better investment than filling every square metre. There was no commission-driven upselling and no pressure. For a six-figure capital project, that straight talk is exactly what you want from the people advising you. We will be using them again on our second site.
Sigenergy is one of the newer names in commercial solar, founded around 2022 by a senior team that came largely from Huawei's digital-power division. In a short time it has built a coherent product family, from the Sigen PV M1 string inverters used on commercial roofs to the SigenStack and Gateway storage covered on our commercial battery storage pages. We specify the Sigen PV M1 on >50 kWp schemes where its design, MPPT layout and AC support match what the array and the connection need.
This site sits outside MCS, which is a domestic scheme, so we do not use it as a trust signal here. Instead we are precise about what Sigenergy is today: a strong product with serious backing, and a manufacturer whose operating history is shorter than the long-established inverter houses. We say so, and we confirm the parts that matter to a finance director before we rely on them.
We reach for Sigenergy when a project benefits from a modern, high-MPPT-count string design and a single vendor whose inverter and storage hardware share one ecosystem and monitoring platform. The Sigen PV M1 range carries integrated arc-fault detection (AFCI) and an IP66 enclosure, which suits exposed commercial rooftops, and its multi-MPPT inputs help where a roof has several orientations or partial shading across the day.
We do not specify it on badge alone. Because it is a new entrant, the decision is made on the engineering fit for the specific array, the AC and grid-protection requirements at the connection point, and a per-project check of warranty and UK support, rather than on any claimed market standing.
The commercial range we draw on is the Sigen PV M1 three-phase string inverter line. From live UK distribution that means principally the Sigen PV 50M1-HYA (50 kW, 4 MPPT), the Sigen PV 80M1-HYA (80 kW, 6 MPPT) and the Sigen PV 100M1-HYA (100 kW, 8 MPPT), with the wider M1 family extending to 110 kW and 125 kW. All carry up to around 98.6% maximum efficiency, IP66 protection and integrated AFCI.
The model and quantity for any scheme come from the PV*SOL design and a site survey, sized to the array, the roof layout and the grid connection. We publish no inverter price; the figure on your proposal comes from the modelled design, never a list price or a "from" number.
The Sigen PV M1 inverters report through Sigenergy's monitoring platform, which gives string-level yield and fault data for the O&M team and a clear view for facilities or asset managers. Where the same site also uses Sigenergy storage, the inverter and battery sit on one platform, which keeps commissioning and ongoing support consolidated under a single vendor.
Every commercial inverter we install is commissioned to G99 and configured for the DNO's terms, including any export limitation set as a condition of the connection. On warehousing and logistics roofs that export ceiling often shapes the sizing as much as the roof does. Because Sigenergy is a newer brand, our per-project due diligence on warranty length, connectivity conditions, extension options and the UK spares and service path is part of how we stand behind the system, and our own O&M and remote-monitoring offer covers the asset regardless of which inverter is fitted.
50 kW three-phase string PV inverter, 4 MPPT, up to ~98.6% max efficiency, IP66 with integrated AFCI; for >50 kWp commercial rooftop and ground arrays.
80 kW three-phase string PV inverter, 6 MPPT, up to ~98.6% max efficiency, IP66 with integrated AFCI; for larger commercial roofs with mixed orientations.
100 kW three-phase string PV inverter, 8 MPPT, up to ~98.6% max efficiency, IP66 with integrated AFCI; for high-capacity commercial and light-industrial arrays.
Models shown are confirmed against the current datasheet and your design at survey. The figure for your system comes from the PV*SOL model, not a price list.
We make no bankability claim for Sigenergy. It is a new entrant, founded around 2022, and it does not lead any independent inverter bankability survey. What we can state honestly is that it has active UK distribution, in-stock commercial M1 inverters and a stated 10-year manufacturer product warranty. For a financed project we confirm the warranty terms, any connectivity conditions and the UK support path in writing rather than relying on a ranking it has not earned.
For >50 kWp schemes we use the Sigen PV M1 three-phase string inverters, principally the 50M1, 80M1 and 100M1 (50 kW, 80 kW and 100 kW), with the family running to 125 kW. They use multiple MPPT inputs, carry up to around 98.6% maximum efficiency, and include integrated arc-fault detection in an IP66 enclosure. The exact model and quantity come from the PV*SOL design for your roof, not from a catalogue default.
We specify the inverter that fits the design, not a badge. Sigenergy's M1 range offers a modern, high-MPPT-count design and a single ecosystem across inverter and storage, which suits some commercial roofs well. Where a scheme needs a longer manufacturer track record, we say so and propose an alternative from our range. The choice is made on engineering fit and a per-project warranty and support check, openly.
No. MCS is a domestic certification scheme and does not apply to >50 kWp commercial projects. We assure these installations through the non-MCS engineering stack instead, including BS 7671 design and test, G99 commissioning with the DNO, and CDM 2015 where applicable, regardless of which inverter is fitted.
Tell us about the roof and the load. We size the array in PV*SOL, set the export position with your DNO, and specify the inverter that fits, with the model and warranty named and no from-price.