Plug-in Solar vs Traditional Roof Solar: Costs, ROI, and Compliance
Choosing between a DIY plug-in solar kit and a traditional roof-mounted solar array depends on your budget, property ownership, and energy consumption profile.
Direct Comparison
| Feature | Plug-in Solar Kit (G98) | Traditional Roof Array (MCS) |
|---|---|---|
| Peak Power Output | Capped at 800W AC | Uncapped (typically 3kW – 6kW+) |
| Typical Upfront Cost | £450 – £850 | £5,000 – £9,000+ |
| Installation | DIY / Plug & Play | Professional Electrician & Scaffolding |
| Notification Requirement | Simple G98 Form to DNO | DNO Notification/Approval + MCS Sign-off |
| Export Payments (SEG) | Typically No | Yes (MCS Certificate required) |
| Portability | High (ideal for renters) | Permanent |
| Average Payback | 4.5 – 8 Years | 7 – 11 Years |
Which System Fits Your Needs?
- Choose Plug-in Solar if: You live in a flat, rent your home, have limited capital budget, or want to offset your home’s continuous daytime base load (fridge, internet, standby devices) with minimal hassle.
- Choose Traditional Roof Solar if: You own your home, have high daytime electricity demands, wish to integrate EV charging or large home storage batteries, and want to monetize excess grid export via formal export tariffs.