# WERCHTAY 300W Monocrystalline Solar Panel

Source: https://www.ranked10.co.uk/tech/best-solar-panels/werchtay-300w-solar-panel
Ranked #9 in "Best Solar Panels 2026: 10 Ranked, and Where the Wattage Doesn't Add Up": https://www.ranked10.co.uk/tech/best-solar-panels

- Price: £123.49 (checked on Amazon UK on 2026-09-16)
- Amazon rating: 4.5 from 8 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0FJXT14Y7?tag=ranked10-21

The WERCHTAY 300W Monocrystalline Solar Panel is a single 300W panel rather than a kit, priced at £123.49 in our guide of ten. It sits at number 9, and it carries the cheapest cost per watt of the ten: about 41p per watt, against 98p for the most expensive panel in the guide.

On this listing the title and the specification field agree with each other — both say 300 Watts — and the numbers back that up: 15.88 Amps at 18.9 Volts works out at roughly 300W. That is not true of every panel in this guide, where a 200W kit has shown 'Maximum Power: 100 Watts' and a 390W kit has shown 340W. What does not line up here is the headline power and the panel's own efficiency. The listing claims 25% efficiency and gives the panel as 1354 x 767 mm, which is just over one square metre. At 25% efficiency, a panel that size comes out nearer 260W, so the 300W headline sits above what the listing's own efficiency figure and its own dimensions imply. The daily figure has the same shape: 'approximately 1200 WH/day under 4 hours of full sunlight' is exactly 300W multiplied by four hours, with nothing set aside for heat, wiring or mounting angle.

Everything on this page comes from the Amazon listing for this panel — its title, bullets, specification fields, ratings and reviews — and not from any testing we carried out ourselves.

## Specification

| Field | Value |
|---|---|
| Price | £123.49 (about 41p per watt) |
| Rating | 4.5 out of 5 from 8 ratings |
| Maximum Power | 300 Watts |
| Efficiency | 25% |
| Amperage Capacity | 15.88 Amps |
| Maximum Voltage | 18.9 Volts |
| Dimensions | 135.4 x 76.7 x 3 cm (1,354 x 767 x 30 mm) |
| Spare part availability | 25 Years (as listed) |

## Questions people ask

**Is the WERCHTAY 300W actually 300W?**

The title and the specification field both say 300 Watts, and 15.88 Amps at 18.9 Volts works out at about 300W. The harder figure to follow is efficiency: 25% across the stated 1354 x 767 mm works out nearer 260W, so the 300W headline sits above what the panel's own efficiency figure implies.

**How much power does it produce in a day?**

The listing says about 1,200 Wh/day under 4 hours of full sunlight. That is exactly 300W multiplied by four hours, so no allowance is made for losses.

**What comes in the box?**

The Included Components field says '300w solar panel' — one panel, one pack. The bullets also mention a pre-installed diode, a pair of 90 cm cables and an IP68 waterproof junction box. No controller, mount or inverter is listed.

**What are the dimensions and weight?**

1354 x 767 x 30 mm and 12.1 kg. WERCHTAY describes this as a 12.5% smaller footprint and 17.2% lighter weight than comparable panels, without naming which panels it is comparing against.

**What warranty does WERCHTAY offer?**

The Manufacturer Warranty Description says '2 year manufacturer'. A separate field lists 25 Years for EU Spare Part Availability Duration.

**Can it be used off-grid, on a boat or in a van?**

The listing says the module is designed for off-grid power systems and can be connected in series or parallel, and it names boats, RVs, trucks, trailers and balcony power stations as intended uses.