Alectrona
Commercial inverters · over 50 kWpSungrow is the largest PV inverter maker by shipment volume and the brand that leads BloombergNEF's 2025 Inverter Bankability Survey. We cite that survey precisely: it rates the inverter supplier, and it is separate from the BloombergNEF module Tier 1 list.
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.
Sungrow Power Supply Co., Ltd, founded in Hefei in 1997, is the largest PV inverter maker in the world by shipment volume. It shipped around 143 GW of PV inverters in 2025, an estimated 30% of the global market, and reported total revenue of roughly CNY 89 billion for the year with net profit up about 22%, so there is no financial-standing question to caveat here. For commercial solar above 50 kWp it gives us a continuous three-phase string range, from a 50 kW unit up to 150 kW on the 1100 Vdc CX platform, and a 1500 Vdc machine at 350 kW for large ground-mount.
It is also the one brand in our inverter line-up that carries a current, citable inverter-bankability claim. Sungrow ranked first in BloombergNEF's 2025 Inverter Bankability Survey, the sixth time it has done so. We set that out precisely below, including what the survey does and does not measure, because the credible thing to do with a strong claim is to state it accurately rather than inflate it.
We specify Sungrow when a commercial scheme rewards scale, a deep three-phase range and a supplier a financier will recognise. The CX units carry a high MPPT count for their size, from 5 trackers on the SG50CX up to 12 on the SG125CX-P2, which lets us group strings cleanly across a roof with several pitches, orientations or shading zones and hold yield across the array. The enclosures are IP66 with C5 anti-corrosion, which suits exposed or coastal commercial roofs, and the larger CX models allow generous DC-to-AC oversizing where the load profile justifies it.
The bankability standing matters where a lender or finance director is in the room. Sungrow ranked first in BloombergNEF's 2025 Inverter Bankability Survey, with 100% bankability recognition among the financiers, technical advisers and EPCs surveyed, and it has now taken that top spot six times. That survey assesses the inverter supplier on warranty backing, support, lead times and financial stability. It is a different question from the BloombergNEF Tier 1 PV-module list, which is a module financeability scheme, so we never call a Sungrow inverter "Tier 1". Where a scheme rewards EU provenance or the deepest plant-control stack instead, we put Fronius or SMA forward and say so. We still confirm the exact warranty term and the current supplier standing for the proposed model before contract, because the standard warranty length varies by model and UK purchasing channel.
The commercial range we draw on is the SG CX three-phase string family on the 1100 Vdc platform. It runs from the SG50CX (50 kW, 5 MPPT, up to 98.7% peak efficiency) through the SG75CX-P2 (75 kW, 8 MPPT) and the SG110CX workhorse (110 kW, 9 MPPT, up to 98.7%) to the SG125CX-P2 (125 kW, 12 MPPT, with a recommended PV input around 175 kW for high oversizing) and the SG150CX at the top of the C&I band. All carry IP66 protection with C5 anti-corrosion and Type II DC and AC surge protection. For large ground-mount and utility arrays we step up to the SG350HX, a 1500 Vdc machine at 350 kW with up to 16 MPPT, up to 99.01% peak efficiency and reactive support that holds in weak grids.
Several designations now carry a current -P2 revision, the SG75CX-P2 and SG125CX-P2 among them, so we specify the exact P2 or non-P2 datasheet the distributor actually supplies rather than assuming a generation. The model, count and DC-to-AC ratio come from the PV*SOL model built off your site survey, not from a catalogue line, and we publish model, power, phase, MPPT count and efficiency, never a price.
Sungrow CX and HX string inverters report through iSolarCloud, the manufacturer's web and app monitoring platform, connected by the WiNet-S communication module over Wi-Fi, Ethernet or RS485, with smart string-current monitoring and device-level diagnosis. Larger plants add a Sungrow data logger for fleet-level monitoring. Plant-level export control and grid services are handled at the logger or EMS layer rather than at the inverter alone, so for any site with a DNO export limit we confirm the specific G99 export-limitation architecture against the connection conditions rather than assuming module-level capability. Every commercial inverter we install is commissioned to G99 and configured to the DNO agreement, and where the connection carries an export limit we hold the agreed limit at the logger or EMS layer.
As the specifying and installing contractor we own the support relationship. We hold the iSolarCloud access, handle warranty claims and DNO correspondence and keep the as-built records a financier or facilities team needs over the asset's life. Sungrow has a UK entity, Sungrow Power UK Ltd, issuing UK warranty documentation, and the range is stocked through mainstream wholesalers including Midsummer; we confirm the installer's actual purchasing channel and the current stock and lead time for the specific SG CX or SG350HX SKU before we quote.
50 kW three-phase string inverter, 5 MPPT, up to 98.7% peak efficiency, 1100 V max DC, IP66 with C5 anti-corrosion; the entry size in the CX C&I band for >50 kWp arrays when paralleled.
75 kW three-phase string inverter, 8 MPPT, up to 98.5% peak efficiency, 1100 V max DC, IP66 with AFCI 2.0 and C5 anti-corrosion; current P2 generation superseding the original SG75CX.
110 kW three-phase string inverter, 9 MPPT, up to 98.7% peak efficiency, 1100 V max DC, IP66 with Type II DC and AC SPD; the workhorse C&I unit for larger commercial roofs.
125 kW three-phase string inverter, 12 MPPT, up to 98.5% peak efficiency, 1100 V max DC, IP66; recommended max PV input around 175 kW for high DC-to-AC oversizing, current P2 generation.
350 kW three-phase string inverter, up to 16 MPPT, up to 99.01% peak efficiency, 1500 V max DC, IP66 (NEMA 4X); 1500 Vdc class for large ground-mount and utility arrays, stable in weak grids.
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.
Yes, and it is the one brand in our line-up with a current, citable inverter-bankability claim. Sungrow ranked first in BloombergNEF's 2025 Inverter Bankability Survey, with 100% bankability recognition among respondents, the sixth time it has taken the top spot. That survey rates the inverter supplier on warranty backing, support, lead times and financial stability. It is not the BloombergNEF Tier 1 PV-module list, which is a separate module financeability scheme, so we do not describe a Sungrow inverter as Tier 1. We still confirm the warranty term and current supplier standing for the exact model before any financed project.
For >50 kWp roofs we lead with the SG CX three-phase string range on the 1100 Vdc platform: the SG50CX (50 kW, 5 MPPT), SG75CX-P2 (75 kW, 8 MPPT), SG110CX (110 kW, 9 MPPT) and SG125CX-P2 (125 kW, 12 MPPT), up to the SG150CX. For large ground-mount and utility arrays we step up to the 1500 Vdc SG350HX at 350 kW with up to 16 MPPT and up to 99.01% peak efficiency. The model, count and DC-to-AC ratio come from the PV*SOL design for your site.
Those are two separate things, and we keep them apart. Sungrow is the largest PV inverter maker by shipment volume, around 143 GW in 2025 at roughly 30% global share, and it leads BloombergNEF's 2025 Inverter Bankability Survey. Neither makes it module Tier 1, because the BloombergNEF Tier 1 list is a PV-module financeability scheme that does not apply to inverters at all. So we cite the shipment scale and the inverter-bankability ranking precisely, and we never label a Sungrow inverter Tier 1.
The standard term varies by model and UK channel, so we confirm it per project rather than quote a blanket figure. Commercial documentation indicates a 5-year baseline on the string range, extendable by paid extension up to a total of 25 years, while some UK channels advertise 10 years as standard on specific SKUs. We verify the issued warranty document for the exact model and purchasing channel before contract, then register and document it at commissioning so it is active from handover. Note also that several models carry a current -P2 revision, so we confirm the precise SKU the distributor supplies.
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.