12V solar panels charging kits for caravans, motorhomes, boats, yachts, marine

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For the first time since we have owned the boat (28 years), we have more power than we need. Fantastic, and thanks again.

John (Weybridge, Surrey, UK) - May 2015

We are a trusted supplier to thousands of UK clients

We are a trusted supplier to thousands of UK clients

Caravans and motorhomes

Where to start?

When looking for the ideal solar panels for your motorhome, caravan or RV, a dizzying amount of measurements, mathematical diagrams and choices are thrown at you from all directions.


  • Free electricity generation
  • Silent power
  • Zero reliance on fossil fuel (petrol or gas) 

Standard Test Conditions (STC)

 Conditions such as light intensity, temperature and wind to test solar panel output in a laboratory 

The difficulties relating to solar panel purchases are usually down to misinterpreted information or greediness from the supplier. In this article, we will provide:

- Helpful tips on how to maximise the energy output from a solar kit;

- Describing different solar panels and how to install them;

- Advice on the size of solar panel and size of controller you will need;

- Extra products for the solar charging process.

Tips to get the maximum energy output from your new solar kit

Power (W)

Watts (W) = Current in amps (A) x voltage in Volts (V)

Energy (Wh)

Watt hours (Wh) = Power in watts (W) x time in hours (h)

Battery capacity (Ah)

Amp hours (Ah) = Energy in watt hours (Wh) / voltage in Volts (V)

Many complaints about solar panels are that they are too expensive, do not work all the time, and do not create enough electricity when it is required. These points are all valid if an incorrect solar power system is purchased. For example, a trickle charge solar power kit will not create enough charge to top up a battery that is being used constantly all year round by large electrical appliances. This small mistake becomes an expensive one if a larger solar kit is needed instead.

There are several easy tips to get the best from your purchase and increase the electricity potential:

The Sun - Solar panels require bright, direct sunlight to be able to produce the maximum electricity,

Position outside - This may seem straightforward, but positioning solar panels behind windows may reduce the output of the solar panel by 50%,

Reduce inefficiencies - Shortening the length of cable, buying a better controller or enlarging your battery capacity can make more electricity ready for you to use,

Take your time - Do some research and follow this guide so that you will have a better idea of the best system for your specific needs.

Different types of solar panels

The market for solar panels is increasing rapidly. Every year, new panels are being created that increase the efficiency and maximise the energy output. The two main players are monocrystalline and polycrystalline. These are the names given to how the solar cells are manufactured using different structures of crystals. The panels themselves look very different and can be rigid or flexible (please click on the photos for more info).


• Mould and attach to any surface

• Walk on them without damage

• Waterproof and salt water-resistant


• Strong aluminium frame

• 4 mounting holes for installation

• Waterproof and salt water-resistant

Polycrystalline PV panels

Solar cells are made from many crystals, producing a bumpy and metal flake appearance. Panels may be slightly larger

Monocrystalline PV panels

Solar cells are made from a single silicon crystal, producing a continuous colour throughout. Panels may be slightly smaller

How do I attach solar panels to my vehicle roof?

There are several ways to attach solar panels to your motorhome or caravan roof. The rigid panels have four mounting holes to fit four metal brackets that screw securely into your roof. Flexible panels would require self-tapping screws (not supplied by Photonic Universe) to be positioned in the white plastic corners of the panel itself.

If you would prefer not to make any holes in the roof of your vehicle, you can mount your panels using plastic corner and side brackets. These would have to be stuck down using a suitable adhesive (again, not supplied by Photonic Universe, but we recommend Sikaflex). The plastic mounts can be used for both rigid and flexible panels, however flexible panels can also be stuck directly to your roof if required. Velcro and zippers are also alternative methods of attachment.

What if I do not want a permanent solar panel on my roof?

If you do not like the idea of permanently fixing a solar panel on your vehicle, then we also offer Folding Solar Charging Kits. These are completely waterproof, battery-charging kits made of two rigid panels, a controller and cables that can be erected quickly on sunny days and folded away when you are back on the road. If you would like one of these kits, follow the next section closely and choose which size kit is appropriate for your needs.


What size solar panel?

When it comes to solar panels, size does matter. If you are intending to power all the appliances in your motorhome or simply want to top-up your leisure battery, the amount of solar panels and the size (in Watts) will be important. The table below is a quick and easy guide to guage the size of a solar panel required for everyday appliances in your motorhome or caravan (appliances include: 5 LED lights; small TV; hot water pump; gas-fired & electric fridge; 300W inverter charging two or three appliances; 600W inverter charging four appliances):-

Solar panel size (watts) Appliances

Please note: this is a helpful guide and any purchases that are made using this material are the responsibility of the consumer.

Do I need a solar charge controller?

The solar charge controller (or regulator) is needed for all solar panels over 10W because it controls the voltage and current between the solar panel and the battery from overcharging and reverse current flow. All solar charge controllers are rated in amps (e.g. 5A controller) and show the voltage tolerance (e.g. 12V).

There are many different types of solar charge controllers on the market today. You can choose from:

  • 5A - 60A PWM solar charge controllers - These are perfect for connecting solar panels to one leisure battery
  • Dual battery controllers - Needed for multiple batteries in a solar power system
  • MPPT controllers - Increases the amps output, so the solar panel works at up to 95% efficiency

When choosing your controller, the watts and voltage rating of the controller are the most important numbers to find. Make sure that the controller can withstand the total amount of volts from your panel(s). Also, if you are thinking about adding more panels to your system in the future, you will need to purchase a controller that can cope with the added voltage.

Here is a guide to choosing the appropriate size solar charge controller for your solar power system (please click on the photo to go to the relevant controller webpage):-

Solar Panel

1 Battery (Standard)

1 Battery (Waterproof) 2+ Batteries Max. Efficiency










Please note: this is a helpful guide and any purchases that are made using this material are the responsibility of the consumer.

For more information about solar charge controllers, please click on the link below:

How to choose...A Solar Charge Controller

Do I need a battery?

As your solar panels can only generate power during the day, a battery is an excellent way
to store all the electricity you generate, so it can be used at any time. Your motorhome or caravan will already have an engine battery or leisure battery, but do you need another? If you are draining your battery to 12.2V, then it is necessary to buy another battery to cope with the load.

When choosing your batteries, we recommend that 250W of solar power will require one 100Ah battery to store the electricity generated. We offer two different types of battery:-

  • AGM - Non-spillable and possibly the safest battery on the market. They have a long-life, and hold charge very well.
  • GEL - Better recovery from deep-discharge and can operate at temperatures down to -10oC. They are vibration proof and can even be stored on their side.

We advise our customers to buy batteries from the same supplier and of the same capacity when connecting them in a battery bank. This is because batteries of different sizes or ages can have negative effects on each other when they are connected. 

Do I need an inverter?

An inverter is a small device that can convert battery power (DC), to standard 240V mains electricity (AC). This makes it possible to power all of your favourite electronic appliances like a TV, fridge, radio, lights, or to charge a mobile phone and laptop.

If you would like to charge and use these appliances, then an inverter is the only option. You can choose an inverter based on:

  • The power consumption of your load

    Alternating Current (AC) Power

    The most common form of electricity through home plug sockets

    Direct Current (DC) Power

    Produced by solar panels and batteries. This has to be converted to AC if it is to be used by electrical appliances

  • The input voltage
  • Type of inverter

To consider these factors and understand more, please read the following article:

How to choose...DC to AC inverter

Next steps

Now that you have got an idea about the size of solar panel and the size of controller for charging your batteries on your motorhome or campervan, why not have a look at our online shop for kits that include cables and mounting accessories so that you can start creating your own solar energy.