Taking over an orphaned commercial solar system

An orphaned system is a commercial solar or storage installation whose original installer is no longer there to support it. The company has folded, been sold on, or simply stopped returning calls. The panels keep generating, but nobody is accountable for the wiring, the inverters, the monitoring or the warranties, and the paperwork that proves the install was done properly is often missing.

That is a common position for a finance or facilities director to inherit, and it is a solvable one. We take the system on: it is diagnosed first, by the group's separate diagnostics and repair arm, then Alectrona puts right what the survey finds and carries the asset forward under a written maintenance contract. The rest of this page sets out that sequence, and what you are holding at the end of it.

Most owners find out they are orphaned at an awkward moment, and the instinct is either to panic or to leave it alone. An orphaned array is rarely an emergency, but it is a clock. The useful response is a short, ordered set of steps that put you back in a position to decide, and none of them commits you to anything.

• Find out what you actually have. Locate whatever paperwork exists: the handover pack, the electrical and commissioning certificates, the G99 connection records, the equipment list. Gaps are normal and are not a blocker, but knowing what is missing is the starting point.
• Stop trusting the old performance figures. The monitoring login has usually gone with the installer. Until someone can see the system properly, the generation on your bill is the only honest signal you have, so assume nothing about whether the roof is earning what it should.
• Get eyes on it before a fault becomes expensive. A commercial array is a live electrical generator on an occupied building, and a first inspection needs neither the manufacturer portal login nor the original installer, so nothing has to be recovered from the firm that walked away before it can happen. Acting early catches a developing fault while it is still cheap, and while it is still a maintenance question rather than an insurance one.

Those three steps cost you nothing and leave every option open. What follows on this page is the route most owners take once they have done them.

A solar array is a long-life asset, and an unsupported one quietly loses value. A tripped string, a failed inverter or a dropped monitoring link can sit unnoticed for months, so the first sign is usually a bill that has crept back up. Without anyone watching the system, an underperforming roof looks the same as a healthy one until you read the meter.

The deeper risk is the things you cannot see. Field-made MC4 connectors are one of the most common fault categories on field-built arrays, and a corroded pin is a leading cause of the heat and arcing behind rooftop fires. When the installer is gone, so is the record of what was fitted, how it was tested and what is still under warranty. An orphaned system is usually undocumented as well as unsupported, and that is what a takeover puts right.

Beyond the generation you quietly stop earning, two costs sit behind an unsupported system. Manufacturer warranties on the panels and the inverters may still be live, but the registration and the route to make a claim usually went with the installer, so a failure that should have been covered becomes a bill you pay yourself. And an un-actioned fault on a live rooftop generator is something your insurer cares about as much as your accountant does, which is why getting the system looked at matters ahead of whatever the repair turns out to cost.

Adoption is not the only way back to control, and the choice stays yours. The decision comes down to one thing: whether you want to know where you stand before committing, or would rather hand the whole problem to one team.

If you want to decide before committing, an independent audit is the honest first look. It checks the design against the as-built reality, measures performance against what the roof should produce, and reviews the safety and compliance the missing paperwork was meant to prove. The written report is yours to act on however you choose, including with a third party.

In practice many owners start there and move to a takeover once they have read the report, though you do not have to. If you already know you want the system adopted and supported, the takeover set out below opens with its own diagnostic and covers the same ground.

We start by establishing what you actually have, because the brochure and the as-built rarely match. Solar Tech Support runs the diagnostic: a brand-agnostic inspection of the array, the inverters, the protection and the monitoring, across whatever hardware the original installer used.

• An in-house drone survey of the roof or site, flown by our own pilot, fully insured, to inspect the array without a roof access scaffold
• A full electrical and performance diagnostic against the relevant component standards, finding the faults, the safety issues and the lost generation
• A plain written report of what is wrong, what is at risk and what it will take to put right, with no obligation to have us do the work
• The remedial work itself, then ongoing operations and maintenance under a written contract, so the asset has a named owner again

Independence is easy to assert, so it is worth setting out where it actually comes from. Solar Tech Support is a repair business rather than an install business, and it earns its living on hardware other companies fitted, so a diagnosis that finds a single failed connector is as good a day's work to it as one that finds a dead array. It also carries no house brand to sell you in place of what is already on your roof, which is the incentive that quietly shapes most second opinions in this trade. Across a high volume of orphaned systems it has usually seen the fault before, so the report tends to name the part rather than the symptom.

Where remedial work is needed, our Qualifying Supervisor reviews the install report before sign-off. They are a fully AM2-trained electrician, and the engineer who did the work never signs themselves off. That independent review is how a fault gets caught before it goes back on your roof, and it is the same discipline we apply to a new build.

Once the system is put right, it moves onto a maintenance footing rather than back into limbo. We monitor performance through Sentinel, our own free monitoring app, so a fault is found early rather than at the next quarter's bill, and the diagnostic depth of Solar Tech Support sits behind it if something needs a hands-on visit.

The arrangement is set out in a written maintenance contract with one accountable group across diagnosis, repair and ongoing care. You inherit a documented system with a phone number that gets answered, which is the thing the original installer stopped providing.

The reason a takeover can rebuild a missing record is that the original install was meant to meet published standards, so the diagnostic re-checks the array against those same standards rather than against the installer's word for it. The electrical inspection works to BS 7671, the UK wiring regulations, covering the DC and AC sides, the isolation, the earthing and bonding, and the protective devices that a fire or a fault depends on. The array-specific testing follows IEC 62446-1, the standard that defines the commissioning and periodic tests for a grid-connected PV system, including the string insulation resistance, the open-circuit voltage and the polarity checks that a field-built array is most likely to have wrong.

Where the system exports to the grid, the connection sits under a G99 agreement with the distribution network operator, which across Yorkshire and northern and north-eastern Lincolnshire is Northern Powergrid. An orphaned system often has a G99 connection whose paperwork left with the installer, so part of re-documenting the asset is confirming the connection terms and the protection settings still match what the network agreed. Reading what each of these tests means in plain terms is covered in the commercial solar guides; the point of the takeover is that the array is measured against them again, not assumed to still pass.

Remedial work on a commercial roof is construction work, so a takeover is run as a project under the Construction (Design and Management) Regulations 2015 rather than as an informal repair visit. That sets out who is responsible for planning the work, controlling the risks of working at height and around live DC, and handing over the right information at the end. For a finance or facilities director it means the legal duties that sit on you as the party commissioning the work are accounted for from the outset, not discovered afterwards.

The site assessment that drives that plan starts in the air. Our in-house drone pilot holds the A2 Certificate of Competency and a General VLOS Certificate, and is fully insured, so we can survey the condition of an unfamiliar array and read the roof for hazards before anyone climbs onto it, without standing up a scaffold just to look. That capability is ours rather than a subcontractor's, which is why it can be brought to bear early on a system we did not build. The detail of that survey is on the 3D drone survey page, and the broader assessment route, where you want a report before committing, is the independent audit.

The lasting value of a takeover is that the asset stops being a black box. When the work is signed off you receive the documents the original installer was meant to leave and did not: the electrical test certificates to BS 7671, the array commissioning results to IEC 62446-1, an updated record of the inverters, strings and protection as they now stand, and the warranty position on the equipment that remains. That record is what lets the next engineer, a buyer's surveyor or a funder understand the system without starting from scratch again.

From there the array sits under a written maintenance contract with planned re-inspection, so the documentation stays current rather than ageing back into the state you inherited. How that ongoing footing works is set out under operations and maintenance. The combined effect is that an undocumented, unsupported system becomes a documented one with an accountable owner, which is the gap the original installer left behind.