# Run Air Conditioning on Solar Panels | London Costs

> Cooling demand peaks within an hour of solar generation. What size array runs air conditioning in London, what it costs, and why a battery covers the evening.

*Climate Shield London — https://climateshieldlondon.co.uk/air-conditioning-solar-panels/. Verbatim from the page; this is the same content, not a summary.*

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![Solar panels on tilted ballasted frames on a London flat roof](https://climateshieldlondon.co.uk/assets/img/own/solar-flat-roof-tilt-1400.webp)

# Air conditioning run on your own solar

Cooling demand peaks within an hour of solar generation. It is the best match between a load and a panel that exists in a British house, and almost nobody points it out.

Call 020 3393 1661 [WhatsApp us](https://wa.me/447976704160?text=Hi%20Climate%20Shield%2C%20I%20want%20air%20conditioning%20and%20solar%20together.)

## Brands we work with

![Daikin](https://climateshieldlondon.co.uk/assets/img/brands/daikin.ce47c11f.webp) ![Mitsubishi Electric](https://climateshieldlondon.co.uk/assets/img/brands/mitsubishi-electric.2977d309.webp) ![Samsung](https://climateshieldlondon.co.uk/assets/img/brands/samsung.3b6b3325.webp) ![Bosch](https://climateshieldlondon.co.uk/assets/img/brands/bosch.7d80a7ce.webp) ![Vaillant](https://climateshieldlondon.co.uk/assets/img/brands/vaillant.573f9864.webp)

Yes. A 5 kW living room air conditioner draws about 1.2 kW while it is cooling, and a 5.1 kWp array in London is producing three to four kW on the afternoons you want it. The generation and the demand arrive at the same hour.

Running that unit for 6 hours on a hot day costs about £2 off the grid at 26p per kWh. Off your own roof it costs nothing, and on the days it is not hot the same panels are cutting the rest of the bill.

## Why the timing works

This is the whole argument, in one table.

| Time | What the roof is doing | What the cooling is doing |
| --- | --- | --- |
| 9am | Ramping up, about 1.5 kW | Off, or barely on |
| 12pm | Near peak, 3 to 4 kW | Starting, about 1 kW |
| **2pm to 5pm** | **Peak, 3 to 4 kW** | **Peak, 1 to 2 kW** |
| 7pm | Falling, under 1 kW | Still running |
| 10pm | Nothing | Bedroom unit, about 0.6 kW |

The two rows in bold are why this pairing is worth doing. Everything from 7pm onwards is the argument for a battery rather than an argument against solar.

## What it looks like on a London roof

Most of what we fit is a flat roof on tilted ballasted frames, which needs no penetration of the roof covering at all.

![Ballast trays laid out on a flat roof before the panels go on](https://climateshieldlondon.co.uk/assets/img/own/solar-ballast-trays-840.webp)

### Ballasted, not bolted

The trays are weighted with sand rather than fixed through the membrane, so the roof warranty is untouched and nothing is drilled.

![MPPT meter reading 116.8 watts from a panel during commissioning](https://climateshieldlondon.co.uk/assets/img/own/solar-commissioning-meter-840.webp)

### Every string tested

Each string is metered at commissioning and the reading goes in your handover pack. A panel that is underperforming on day one is found on day one.

![Fox ESS inverter and isolators mounted on a plywood backboard](https://climateshieldlondon.co.uk/assets/img/own/inverter-and-isolators-840.webp)

### Hybrid inverter as standard

Specified so a battery can be added later without replacing it. That decision costs a few hundred pounds now and saves well over a thousand later.

## Price the solar side

Panels, inverter, scaffolding and MCS certification, from our own rate card. The cooling is priced separately.

How big an array?

Add storage?

£3,900*to*£5,050

Supplied, fitted and commissioned, MCS certified under registration NIC-601634. 0 per cent VAT until 31 March 2027. Scaffolding is included; a roof we can reach safely off a ladder comes in under this.

Send this on WhatsApp Call 020 3393 1661

Every figure on this site is an estimate based on published UK market ranges and our own installation experience. It is not a quotation. The price you are given after the free survey is the price you pay.

## Running cooling on your own generation

### Can solar panels really run air conditioning?

A 2.5 kW bedroom unit draws about 0.6 kW while it is cooling and a 5 kW living room unit about 1.2 kW. A 5.1 kWp array on a clear June afternoon is producing three to four kW. So yes, comfortably, and with generation left over.

The reason it works so well is timing rather than size. The hottest part of the day is the sunniest part of the day, which means the load and the generation arrive together without any storage at all.

### What about the evening, when it is still hot?

That is what a battery is for, and cooling is the load that justifies one fastest. Generation collapses around six in the evening; a west-facing bedroom is still warm at ten.

A 5 kWh battery adds £2,040 to £2,335 and covers roughly four to eight hours of one unit running.

### Does it work in winter, when the heating matters?

Less well, and it is worth being straight about that. A London array in December produces perhaps a fifth of what it produces in June, at exactly the time heating demand is highest.

So the honest position is that solar makes cooling nearly free and makes heating cheaper rather than free. Both are worth having; only one of them is a headline.

### Do I need a special inverter or a special air conditioner?

No. The panels feed the house's electricity supply and the air conditioning draws from it like anything else. There is no direct connection between them and nothing bespoke to buy.

The one specification decision worth making early is a hybrid inverter rather than a string inverter, so a battery can be added later without replacing it.

## One survey, both systems, one price

If you want both, doing them together saves a second set of scaffolding, a second electrical isolation and a second visit. We survey for both at once.

Call 020 3393 1661 [WhatsApp us](https://wa.me/447976704160?text=Hi%20Climate%20Shield%2C%20I%20would%20like%20a%20survey%20for%20air%20conditioning%20and%20solar%20together.)

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