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Commissioning and fault guides for EV chargers, solar inverters and home batteries.

An installer with a question about a charger, an inverter or a battery often rings the distributor first, and the distributor rings you. Lingo turns your installation manuals into step-by-step guides that your technical team checks and publishes. Installers and distributors follow the same guide on WhatsApp, Teams, web or email.

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Lingo

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Installer: Charger keeps cutting its current back when the house is busy. Is the clamp wrong?
Lingo: How many grid clamps are on this phase? 1. One 2. More than one
Installer: 2
Lingo: 1. Keep one grid clamp on this phase. 2. Move the others as your manual shows. 3. Check the arrow points the way your manual shows. 4. Check the reading in the installer menu.

Checking the grid clamps

Published
Start

QUESTION

How many grid clamps are on this phase?

ANSWERS

  1. 1.One
  2. 2.More than one
More than one

FIX

1. Keep one grid clamp on this phase. 2. Move the others as your manual shows. 3. Check the arrow points the way your manual shows. 4. Check the reading in the installer menu.

The installer rings the distributor. The distributor rings you.

Chargers, inverters and batteries usually reach site through a wholesaler or a distributor, so that is where an installer’s question goes first. Where it goes next depends on the brand.

  • The distributor answers for every brand it stocks

    One UK wholesaler of solar, storage and EV chargers gives its account holders a technical support engineer for questions before, during and after an installation, across its whole range.

  • Or sends the installer back to you

    One Irish distributor’s support page lists each manufacturer’s own line for product questions, with numbers in six countries, from Ireland to China.

  • Every manufacturer’s route is different

    Of ten manufacturer support pages we read, one line is open around the clock, one closes for lunch, one takes tickets only through a chatbot and one needs a request number before it will take a call.

A technical advisor at a distributor takes a call on a headset, with a printed installation manual and a boxed charger on her desk.
One guide for both desks Approve a distributor’s numbers and its technical team follows the guides your team published, the same steps the installer gets.

One installation, several rulebooks.

Commissioning a charger or a hybrid inverter means following your manual alongside the wiring regulations, the network operator’s process and, in Great Britain, the smart charging regulations. A guide sends the part of your manual that applies at each step.

Beside a driveway, an electrician crouches to wire a wall charger on the brick front wall of a house, with its cover off.
Earthing The IET Code of Practice for EV charging equipment installation runs to 200 pages in its fifth edition (2023). Your manual says what the charger’s own PEN fault protection does, and a guide sends that part when it applies.
In a garage, an electrician fits a current clamp around the incoming supply cable beside the meter.
Load management One charger manual sets out “CT Golden Rules”: one grid clamp per phase, arrow in the direction of import. Its fix for one warning is “Check CT is installed correctly.”
In a garage, an installer stands looking at a hybrid inverter mounted on the wall above a home battery.
Grid code One inverter maker’s country code overview runs to 71 pages. Great Britain, Northern Ireland and the Republic of Ireland each take a different setting.
An electrician photographs the electricity meter and cut-out in a meter cupboard with his phone.
The network operator In Great Britain, a charger that keeps maximum demand at 60A or less is connected, then notified within 28 days. Above that, the installer applies first. In Northern Ireland the application needs a photo of the cut-out.

Smart charging, in Great Britain

A charge point sold in Great Britain ships with default charging hours outside the weekday peaks of 8 to 11am and 4 to 10pm, and a random delay of up to ten minutes. The owner can change the hours. The regulations do not cover charge points sold in Northern Ireland.

What a guide answers at the charger, the inverter and the battery.

Audits of grant-funded home charger installations for the government found quality “still extremely variable”, with common faults that were “entirely avoidable”. A guide sends the step your manual gives, at the point the installer reaches it.

  • Earthing and PEN fault protection

    What the charger’s built-in protection does, the checks your manual lists when it trips, and how it is reset.

  • Supply clamps and load management

    Where each clamp goes, which way it faces and how to confirm the reading, for the charger, inverter or battery fitted.

  • Connection and app setup

    Wi-Fi, Ethernet or mobile data, pairing with the app and registering the product, in the order your manual gives.

  • OCPP and firmware

    Connecting to a charge point management platform, and what to check when firmware has not updated.

  • Smart charging settings

    In Great Britain, the default charging hours and random delay a charge point ships with, and how the owner changes them.

  • Grid code and country setting

    The setting your manual gives for Great Britain, Northern Ireland or the Republic of Ireland, and the checks when the inverter reports a grid fault.

  • Meter and battery communication

    The checks your manual lists when an inverter loses contact with its meter or its battery.

  • Fault indications

    What a fault on the display means, including residual current and DC leakage trips, and the checks your manual lists for it.

The same answer on the driveway, at the distributor and in your office.

  1. At dusk, an installer reads his phone beside a newly fitted wall charger, with a car plugged in on the driveway.01

    On the driveway

    The installer messages your number, says which charger is fitted and gets the steps one at a time, without waiting for a call back.

  2. At a wholesaler’s trade counter, a member of staff talks to an electrician, with boxed chargers and inverters on the racking behind.02

    At the distributor

    Distributor staff you approve follow the same published guides, so the answer an installer gets does not depend on who picks up.

  3. A technical support advisor on a headset reads an installation manual at his desk, with a boxed inverter beside his monitor.03

    In your office

    A question no guide covers reaches your team by email, and they reply in the same conversation. They can then add the answer to a guide.

Solar and battery installations are at record levels.

Two installers fix solar panels to the mounting rails on a pitched tiled roof.

  • 291,000

    solar installations in the UK in the 12 months to August 2026, the most in any 12 months since 2012

  • 40,000+

    battery storage installations certified by MCS in 2025, almost double the previous record

  • 412,682

    home charger installations funded by government grants since 2013. Privately funded chargers are not counted

From your installation manual to the installer’s phone.

  1. 1

    You send the documents for one product

    The installation manual, commissioning steps, fault table, app and connectivity guides, and any service bulletins. The three current charger and inverter manuals we read run to 50, 51 and 56 pages.

  2. 2

    Lingo drafts a guide for each task

    A guide is a short sequence of questions and fixes. It asks which product and which supply the installer has, and the answer decides the steps that follow.

  3. 3

    Your technical team checks and publishes

    They check each draft against the manual, correct it and publish it. When a manual or the firmware changes, they edit the guide or unpublish it.

  4. 4

    Installers and distributors message a WhatsApp number

    From a phone number you have approved. Lingo confirms the product, asks the guide’s questions one at a time and sends the steps. They can ask for a person at any point.

Checking the grid clamps

Published
Start

QUESTION

How many grid clamps are on this phase?

ANSWERS

  1. 1.One
  2. 2.More than one
More than one

FIX

1. Keep one grid clamp on this phase. 2. Move the others as your manual shows. 3. Check the reading in the installer menu.

What stays with your team.

A guide carries what your documents say. Questions that depend on the design of an installation, the network operator or an inspection go to a person in one step.

In a training room, a manufacturer’s engineer shows two electricians the wiring inside a charger mounted on a practice board.
Your judgement stays yours Your team decides which questions get a guide and which come straight to them. A guide can pass any of these to a person.

  • Earthing design

    Whether an installation relies on the charger’s own PEN fault protection, an earth electrode or another measure depends on the supply and the site.

  • Network operator applications

    Anything that needs approval before connection, such as a charger that takes the maximum demand above 60A, or storage above 3.68kW under G99.

  • Export limit settings

    Under G100, export limit settings may only be changed with the network operator’s written agreement. A guide can stop there and pass the installer to you.

  • Backup supply and island mode

    They depend on how the installation was designed.

  • Faults that keep coming back

    A contactor fault, or a PEN fault that returns after a reset, needs someone to look at the installation.

  • Warranty

    Claims go to your team or your authorised distributor, as you set out.

Your team decides what an installer is told.

  • You choose what gets a guide

    A procedure you would only talk a trained installer through by phone can be left out, or can end by passing the installer to your team.

  • You choose who can use it

    Access can be limited to the phone numbers you approve: installers, distributor staff and service partners, added one at a time or imported as a list.

  • You keep a record

    Each conversation is kept with the person’s name and number, the product and the guide used, so you can see what each distributor is being asked.

  • You set the hours for people

    Lingo answers at any time. A request for a person reaches your team in the hours you set. Outside them the installer gets your out-of-hours message.

Questions charger, inverter and battery manufacturers ask

Our installers already have an app and a portal. What does Lingo add?

The documented steps from your manuals, in order, on WhatsApp, Teams, web or email, for the product and supply in front of the installer, at any hour. Every conversation is kept, and a person from your team is one message away. Lingo works from what the installer tells it, on any phone, so it runs alongside your app and your monitoring portal.

Can our distributors use it?

Yes. Approve the phone numbers of a distributor’s technical staff and they follow the same published guides as your own team. A question no guide covers comes to your team, so you see what each distributor is being asked.

Do guides cover Great Britain, Northern Ireland and the Republic of Ireland?

Where your documents do. A guide can ask where the installation is before it sends a step, so the installer gets the setting your manual gives for that grid. Applications to the network operator stay with the installer and your team.

Can it cover older chargers and inverters?

Yes, where the documents exist. Each product has its own guides, and the installer is asked which product and version they have.

Can we keep homeowners out?

Yes. Access can be limited to phone numbers you approve, added one at a time or imported as a list.

How much work is it for our team?

Checking drafts against the manual is the main work. Your team corrects and publishes each guide, and chooses which tasks to start with.

How is it priced?

By the number of products you support, from £500 a month for five products. There is no setup fee, and no limit on installers, distributors or conversations.

Further reading

Sources, read 16 October 2026: installation manuals from two charger makers and one inverter and battery maker; one inverter maker’s country code overview (April 2025); the support pages of ten manufacturers and three distributors; IET, Code of Practice for Electric Vehicle Charging Equipment Installation, 5th edition (2023); The Electric Vehicles (Smart Charge Points) Regulations 2021; MCS, Notifying DNOs; NIE Networks, EVs and heat pumps; National Grid, Customer Export Limitation Schemes; Cenex, Domestic Chargepoint Audit for OZEV; DESNZ, Solar photovoltaics deployment in the UK, August 2026; MCS, The 2025 Low Carbon Landscape; DfT, Grant schemes for electric vehicle charging infrastructure statistics, 1 July 2026.

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