Solar power is an excellent fit for garden offices and studios. A modest system of 2 to 4 panels combined with a battery can power lighting, monitors, broadband equipment and device charging throughout the working day, often without any mains connection required.
The UK garden office boom has created a practical problem: how do you power a workspace at the bottom of the garden without running expensive cable back to the house? Solar power offers a clean, cost-effective solution, and in many cases it works out cheaper than a mains connection, especially if the office is more than 10 to 15 metres from the house.
How Much Power Does a Garden Office Need?
Start by listing the electrical loads you need to run. A typical office setup might include:
- Monitor or laptop: 30 to 150W
- Router or broadband equipment: 10 to 20W
- LED lighting: 10 to 30W
- Phone and device charging: 10 to 30W
- Desk fan or small heater (seasonal): 50 to 1,500W
Excluding heating, a typical home office setup draws 100 to 250W at peak and far less when screens are on standby. Over an 8-hour working day, this amounts to roughly 0.5 to 1.5 kWh of daily consumption.
Sizing the Solar System
Panels
For a typical 1 kWh daily consumption and UK conditions (averaging around 3 peak sun hours per day annually), you need approximately:
1 kWh / 3 hours / 0.8 efficiency = 0.42 kW or 420W of panels
Two 220W panels on the office roof would comfortably meet this. In winter, output drops significantly, so three or four panels are advisable for year-round confidence.
Battery
A battery allows you to work in the morning before the sun is fully up, and in the evening after it drops. Size the battery at 1 to 2 times your daily consumption: 1 to 2 kWh of lithium capacity is ideal for most garden offices. This gives you a day of autonomy in poor weather and acts as a buffer between solar generation and your working pattern.
Inverter and Charge Controller
A hybrid inverter or an all-in-one unit handles solar input, battery management and AC output. For a small office, a 1,000W to 2,000W inverter is sufficient. If you want mains power as an occasional backup, a hybrid unit can accept a grid input while still prioritising solar and battery.
Can You Run Heating from Solar?
Electric heating is high-demand. A 1,500W panel heater running for several hours a day can require 6 to 9 kWh daily, far beyond what a small solar system can reliably provide, especially in winter when solar generation is at its lowest. The pragmatic approach is to insulate the office well, use a low-wattage infrared panel heater and supplement with solar where possible, accepting that winter days may require mains backup.
Installation Considerations
- Panel placement: if the office roof faces south or south-west, mount panels directly on it. East or west-facing roofs still work but produce 15 to 20% less.
- Roof loading: check the structure can take the weight; standard 400W panels weigh around 20 to 22 kg each
- Cable runs: keep DC cable runs short to minimise resistive losses; use appropriately rated cable
- Planning permission: solar panels on outbuildings are generally permitted development in England, but check with your local authority if in a conservation area
Portable Power Station Alternative
If you want to test the concept before committing to a fixed installation, a portable power station like the EcoFlow DELTA 2 paired with two 220W panels is a ready-to-run system that requires no installation. You can move it, expand it and repurpose it. For a studio used a few days per week, this approach may be all you need.
Cost and Payback
A basic solar system for a garden office with two to four panels, a battery and an inverter typically costs between £1,500 and £4,000 depending on specification. Compare this to the cost of a mains cable installation, which can run to £2,000 to £5,000 or more depending on the distance and groundworks required. In many cases, the solar system costs less and generates free power for 20 or more years.
