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How to choose a 12 V solar panel kit

Updated: October 2026

You have a leisure battery going flat in a caravan on the drive, a van between trips, or a shed lamp that fades after a grey week. On amazon.co.uk the boxes look alike: a panel, a small controller, and a price from about £39 to £210. A 12 V solar panel kit in that range charges a 12 V battery. Finish this page knowing whether you are maintaining a stored battery, covering a light weekend, or trying to live from the roof. The [Solar panel kit comparison](/hub/electrical-equipment/solar-panel-kit) lists the seven kits once that class is clear. Watts, the controller, and the parts still missing from the box should narrow the list before you compare models.

You have a leisure battery going flat in a caravan on the drive, a van between trips, or a shed lamp that fades after a grey week.

Our top picks

ECO-WORTHY ECO-WORTHY 240W solar panel kit

Best overall

ECO-WORTHY ECO-WORTHY 240W solar panel kit
8.5/10about £164.49
View offer
DOKIO DOKIO 100W foldable solar panel kit

Rank 2

DOKIO DOKIO 100W foldable solar panel kit
7.5/10about £79.99
View offer
ECO-WORTHY ECO-WORTHY 25W 12V solar panel kit

Rank 3

ECO-WORTHY ECO-WORTHY 25W 12V solar panel kit
6.8/10about £38.99
View offer
On this page
  1. 1.What a 12 V kit is for
  2. 2.Match watts to the job
  3. 3.Controller, brackets, and the parts still to buy
  4. 4.How to read a listing that disagrees with itself

What a 12 V kit is for

A 12 V solar panel kit here is a shop set of panels, a charge controller, and cables, often with brackets, sold to charge a battery in a caravan, van, boat, or shed. A grid-tied array on a house is a different purchase. MCS put a certified home installation at just over £7,000 on average in 2025. None of these kits carries that certificate, and buying one does not put you on the Smart Export Guarantee.

Match watts to the job

Hold three bands until the job is honest, then open the model table. More watts still drop hard in a British December. About 25–30 W is storage. On 19 October 2026 the ECO-WORTHY 25 W kit was £38.99 and the Hoysicy 30 W kit was £39.99, each with a PWM controller. A single 100 W kit is light camping. The rigid Hoysicy and the folding DOKIO were both £79.99. The DOKIO packs into a fabric case and has no tilt stand. Around 240–390 W is the band for several days living in the van: the KOLLNIUN 240 W at £129.99, the ECO-WORTHY 240 W at £164.49, and the ECO-WORTHY 390 W bifacial kit at £209.99. If the roof is already the plan, the solar panel kit for a campervan takes the brackets and the leisure battery from here.
ECO-WORTHY ECO-WORTHY 240W solar panel kit

Testsieger

ECO-WORTHY ECO-WORTHY 240W solar panel kit
8.5/10about £164.49
View offer

Controller, brackets, and the parts still to buy

Every kit in this comparison ships with a PWM controller. PWM is a fair match for a small lead-acid maintainer in open sun. It is a weaker match when the array grows, the roof picks up shade, or the battery is lithium. The 12 V on the title is the battery system, and panel voltage runs higher. One KOLLNIUN reviewer reports an input limit of about 23 V on the 12 V setting and so paralleled the two panels. Brackets are a separate spend from watts. ECO-WORTHY and KOLLNIUN include them. The DOKIO leaves them out, and it has no tilt stand. When you join the controller to the posts, follow how to connect a solar panel kit for the order and the fuse.

How to read a listing that disagrees with itself

The title wattage is what most people sort by, so check it against the bullets. The ECO-WORTHY 240 W listing, £164.49 on 19 October 2026, disagrees with itself on whether the panels are 100 W or 120 W. Until the carton matches one of those pairs, the title is a claim. The 390 W listing clashes in the same way: the title says two 195 W panels, and a spec field says 340 W. With the band, the controller, and the wattage wording settled, the best solar panel kit page names a kit for a job inside it.

Common questions

Does a solar panel kit include the charge controller?
The seven kits here do. Each is sold with a PWM controller and cables. The Hoysicy 30 W bullets mention AGM, flooded, and gel, and a review on that listing says lithium is unsupported.
Is 25 W or 30 W enough to keep a stored leisure battery alive?
Often, when the battery is already healthy and the load is self-discharge plus an alarm or tracker. The ECO-WORTHY 25 W and Hoysicy 30 W kits are that class, about £39, and both include PWM. The Caravan Club's on-site figure is about 40 W, so these two sit at the low end of pitching use.
Is 100 W enough for a weekend, or do I need two panels?
A 100 W kit can cover lamps, phones, and a small fan for a weekend if the leisure battery starts charged and the panel is out of deep shade. Both 100 W kits here were £79.99. Step up to a 240 W-class pair for a compressor fridge, a diesel heater fan, or several cloudy days.
Why do the daily kilowatt-hour claims assume four hours?
Sellers multiply nameplate watts by four and print the result as energy per day. Warmerbills adds about 25% headroom and states that four hours is not a year-round UK promise.
Should the controller be PWM or MPPT on an unshaded shed?
PWM is a reasonable included controller for a small lead-acid float charge in open sun, which is how every kit here is built. A clear shed roof removes shade as a reason to swap. A larger array or a lithium battery remains a reason to look at MPPT.
What is not in the box?
The leisure battery and a mains inverter are absent from every kit in this set. Sealant, a cable gland, and a fuse beside the battery positive are often extra, even when brackets are included. ECO-WORTHY and KOLLNIUN include brackets. The folding DOKIO has a fabric case and no tilt stand.
Do I need planning permission or an MCS certificate for a van kit?
A kit on a van leisure battery charges that battery without an MCS certificate. MCS applies to incentive-linked installed systems, the home jobs that averaged just over £7,000 in 2025. A van roof sits outside the house-roof planning question.

Related pages

PWM vs MPPT

Solar panel kit

Best solar panel kit for a 12 V battery in Britain

Solar panel kit for a campervan roof or your pitch

How to connect a solar panel kit to a 12 V battery

Sources

Public UK sources and the amazon.co.uk listings used for this comparison. Prices and star ratings are the listing lines from 19 October 2026.

  1. GOV.UK: Register energy devices in homes or small businesses (retrieved 19 October 2026)
  2. legislation.gov.uk: GPDO 2015 Schedule 2 Part 14 (retrieved 19 October 2026)
  3. GOV.UK: VAT Notice 708/6, energy-saving materials (retrieved 19 October 2026)
  4. GOV.UK: VAT on energy-saving products (retrieved 19 October 2026)
  5. National Grid: G98 microgeneration (retrieved 19 October 2026)
  6. Electrical Safety First: solar panels (retrieved 19 October 2026)
  7. MCS: why certification matters (retrieved 19 October 2026)
  8. Azeco: PWM versus MPPT charge controllers (retrieved 19 October 2026)