Solar Guides
Practical guides for planning, sizing and wiring a solar system, whether it is going on a roof, a van or a cabin.
Is Plug-in Solar Legal in the UK?
Yes, from 27 August 2026 up to 800 VA. The socket route, G98 evidence, the extension lead ban and the building exclusions
Read GuideBest Plug-in Solar Kits UK
Who is selling plug-in solar in the UK, what it costs, and the compliance checklist to run before buying
Read GuideBalcony Solar UK
What a balcony kit is, the 800 VA socket route as it applies to a balcony, rail and wall brackets and the consent they need, and what a vertical panel actually makes
Read GuideHow to Size an 800W Plug-in Kit
Occupancy versus the 800 VA cap on a UK plug-in or balcony kit, because export is unpaid
Read GuideHow Many Batteries Do I Need for Solar?
Days of autonomy, chemistry and voltage, with worked van and cabin examples
Read GuideWhat Size Charge Controller Do I Need?
MPPT amp rating, then the cold-morning Voc that destroys a controller
Read Guide
Solar Sizing Calculator
Free solar and off-grid sizing calculators
Tools
- Solar System Size Calculator
- Plug-in Solar Savings Calculator
- UK Solar Map
- World Solar Map
- Sun Path Calculator
- Off-Grid Load Calculator
- Battery Bank Size Calculator
- Battery Bank Runtime Calculator
- Charge Controller Sizing Calculator
- Inverter Sizing Calculator
- Solar Panel Series vs Parallel Calculator
- Solar Panel Output Calculator
- Solar Payback Calculator
- DC Voltage Drop Calculator
- Solar Cable Size Calculator
- AWG to mm2 Conversion Calculator
- PV Fuse and Breaker Sizing Calculator
- Energy Cost Calculator (kWh)
- Watt Hour Calculator
- All Tools
Guides
Resources
More Calculators
- Electrical Calculators AC wiring, voltage drop and cable sizing tools
- Flow Rate Calculator Pump, pipe and flow rate tools
© 2026 Solar Sizing Calculator. All rights reserved. A Nomogram Works site.