Alectrona
Commercial inverters · over 50 kWpSolis brings a broad, continuous three-phase commercial string range from 30 kW to 150 kW, from a maker ranked third worldwide by 2024 PV inverter shipments.
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.
Solis is the brand name of Ginlong Technologies, a Chinese manufacturer that has built string inverters since 2005 and is now one of the largest by shipment volume. Wood Mackenzie ranked Ginlong Solis third in the world for PV inverter shipments in 2024, and the company passed 100 GW of cumulative shipments in the first half of that year. In Wood Mackenzie's first-half 2025 manufacturer ranking, a scored assessment of factors such as after-sales service, R&D and supply-chain stability, Solis placed fifth.
For commercial solar above 50 kWp, Solis gives us a deep, continuous three-phase string range. We specify it where the engineering case favours a flexible, well-stocked string platform at a sensible capital cost, and we set out below exactly what those rankings do and do not mean.
We specify the inverter that fits the design, and Solis earns its place on range and availability. Its three-phase line runs without a gap from a 30 kW unit up to 150 kW, and the larger S6 models carry up to ten independent MPPTs. On a commercial roof split across several pitches and orientations, that MPPT count lets us group strings cleanly and hold yield across the array, rather than forcing the layout to suit the inverter. On a roof carried across several pitches, the up-to-ten-MPPT S6-GC(80-125)K lets us group the strings by orientation, so an east bank and a south bank each track their own maximum power point instead of being pulled onto a shared input. That keeps the morning and afternoon yield from fighting each other, and it means a soiled or shaded section drops only its own tracker rather than the whole inverter. The larger S6 units are rated to 1100 Vdc with an IP66 enclosure, so they sit on an exposed commercial roof without a separate weather cabinet, and the transformerless topology keeps the unit light and efficient. Where a roof is heavily shaded or cluttered we weigh that string approach against the module-level route covered on our SolarEdge page, and we specify whichever the survey supports.
It is also a practical choice on lead time and whole-life cost. As a high-volume maker with established UK distribution, Solis stock is readily procurable, and the string-inverter architecture keeps a single point of failure contained to one unit on a large site. We confirm the warranty term and the current support position for the exact model on every project before it is specified.
The commercial range we draw on is the Solis S6 three-phase family, led by the S6-GC3P(40-60)K (40 to 60 kW, four to five MPPT) and the S6-GC(80-125)K (80 to 125 kW, eight to ten MPPT, 1100 Vdc, IP66), with the S6-GC3P(125-200)K family taking the rooftop range up to 150 kW and beyond. The S5 30 kW triple-MPPT unit is the entry point to three-phase, and the 5G PRO platform (80 to 110 kW) covers utility-scale string duty on ground-mount and large-roof arrays.
The right unit, count and DC-to-AC ratio come from the PV*SOL model for your roof, not from a catalogue line. Every figure on this page is taken from the manufacturer datasheets and is confirmable; we publish model, power, phase and MPPT count, and we do not publish a price.
Solis commercial inverters ship with the SolisCloud monitoring platform, giving per-string and per-MPPT visibility, alarms and remote firmware support, which we use for commissioning sign-off and ongoing performance reporting under an O&M agreement. The three-phase units meet G99 for grid connection, and where the DNO sets an export limit we configure dynamic export control (see G100 export limitation) so the site stays within its agreed limit without curtailing self-consumption.
As the specifying and installing contractor we own the support relationship, so a fault routes through us rather than a manufacturer call centre. We hold the monitoring access, handle warranty claims and DNO correspondence, and keep the as-built records that a financier or facilities team needs over the asset's life.
40 to 60 kW three-phase string inverter, 4 to 5 MPPT, up to 98.7% peak efficiency, for commercial rooftop PV.
80 to 125 kW three-phase string inverter, 8 to 10 MPPT, up to ~98.7% peak efficiency, 1100 Vdc, IP66; suits large or multi-pitch commercial roofs.
125 to 200 kW three-phase string family; the 150 kW unit carries 7 MPPT, up to 98.8% peak efficiency, for high-density commercial and light utility arrays.
30 kW three-phase string inverter, triple MPPT, transformerless; the entry point to the commercial three-phase range.
80 to 110 kW three-phase utility-scale string inverter, 1100 Vdc, IP66; for ground-mount and large-roof 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.
Solis is an established global inverter maker by scale. Wood Mackenzie ranked it third worldwide for PV inverter shipments in 2024, and fifth in its first-half 2025 manufacturer ranking, a scored assessment of factors such as after-sales service, R&D and supply-chain stability rather than volume alone. Both measure scale and manufacturer quality, not bankability. The most recent independent bankability placing we hold dates to BloombergNEF's 2019 inverter survey, so we do not claim a present-day bankability ranking; the inverter-bankability survey is led by Sungrow, not Solis. We confirm the current standing for the exact model before any project where a financier requires it.
The commercial lead is the Solis S6 three-phase range: the S6-GC3P(40-60)K and the S6-GC(80-125)K with up to ten MPPT, rising to the 150 kW unit in the S6-GC3P(125-200)K family. The 30 kW S5 triple-MPPT unit covers smaller three-phase loads, and the 5G PRO platform at 80 to 110 kW handles utility-scale string duty. The model, count and DC-to-AC ratio are set by the PV*SOL design for your roof.
The S6-GC(80-125)K models carry between eight and ten independent maximum-power-point trackers. On a commercial roof with several pitches, orientations or shading zones, that lets us group strings so each section is optimised separately, which protects overall yield compared with an inverter that forces the whole array onto fewer trackers.
We do. As the specifying and installing contractor, Alectrona holds the SolisCloud monitoring access, handles warranty claims and DNO correspondence, and keeps the as-built records. A fault routes through us, not a manufacturer call centre, and we confirm the warranty term for the exact model on every project before it is specified.
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.