1. Sign up for a customer account, either through the orange "Rewards" icon at the base of the page or through the customer account icon

2. Redeem a 200 points welcome bonus via the orange "Rewards" button for a £5 discount code on your first order

Please note, occassionally it may take a few minutes for your welcome bonus points to be generated. If this is the case, please wait a few moments and refresh the page.

You can work this out in 3 simple steps.

1. Calculate how much energy you need per day
2. Add on a buffer to account for cloudy/rainy days
3. Divide by sunlight hours per day to calculate solar panel size

Step 1: Work out how much energy you expect you're going to use per day in Watt Hours (Wh).

Example: an isotherm fridge running continuously, charge my iPhone and MacBook once.

• Isotherm Fridge: Dometic 12V fridge specifications show energy consumption as 299.5Wh per 24 hours
• iPhone: iPhone 13 has a 12.4Wh battery, to be charged once per day
• Macbook: MBP 2021 16-inch has a 99.6Wh battery, to be charged once per day

Total: 299.5+12.4+99.6 = 411.5Wh per day needed

Note, if you're planning to power your whole home you can simply check your energy consumption on your utility bill for this step.

Step 2: Add on a buffer to calculate solar power required per day

We usually try to account for cloudy/rainy days where we won't be collecting as much solar power. A pretty safe bet is to assume that one day of sun should give us enough energy to power 3 days worth of activity.

Example: the amount of solar power to collect per day = 411.5Wh x 3 days = 1234.5 Wh needed to collect on a sunny day.

Step 3: Calculate the total solar panel wattage required by dividing by strong sunlight hours per day.

Divide your buffer electricity demand per day by the amount of hours of sunlight available to calculate the total size of panels required.

Example: Assuming 5 hours of good sunlight, 1234.5/5 = 246.5W. Therefore a 250W Solar Panel will provide enough electricity on a sunny day to power your fridge, charge your iPhone and Macbook for 3 days.

Battery Size

This calculation will also show you how large a potential battery you require.

Example: 3 days of storage = 1234.5Wh. To convert to Amp Hours (Ah), you can use the simple formula Watts = Volts x Amps. Therefore capacity required in Amp hours is 1234.5/12V battery = 102.875Ah.

Remember, a lithium battery can be fully discharged with little degradation, meaning it can use its full capacity. A lead-acid battery should never be discharged more than 50%. This means that you will need double the lead-acid battery's stated capacity to get the same power storage capability as a lithium one.

The MC4 connectors on the back of our panels are plug and play. Please head over to our Installation Tips page to find out more.

We test every panel individually prior to dispatch, however there may be times where you want to check that your panel is performing as expected.

Before you start:

• Find the Open Circuit Voltage (Voc) and Short Circuit Current (Isc) ratings on the back of your panel
• Have a multimeter to hand and understand how to use it; check you're using appropriate settings for the power you expect to measure
• Check that sunlight conditions are suitable for producing readings on your system. To obtain the rated output of your panel you will need maximum sunlight falling directly onto the panel. Remember, no sun no power.

Please note, viewing readings through a charge controller will not give an accurate performance of your solar power, as the current and voltages are controlled to optimise for your battery's state of charge (SOC).

Check 1: Open Circuit Voltage (Voc)

• Disconnect the solar panel completely from the battery and regulator
• Angle the solar panel towards the sun
• Ensure that the multimeter is set to measure Volts
• Measure the voltage between the +ve and -ve terminals by connecting the negative contact from the voltmeter to the negative on the panel and the positive contact on the voltmeter to the positive on the panel

Check 2: Short Circuit Current (Isc)

• Disconnect the solar panel completely from the battery and regulator
• Angle the solar panel towards the sun.
• Ensure that the multimeter is set at 10A, at least to start with. You can change the setting later if required.
• Measure the current by connecting the +ve lead on the voltmeter to the +ve on the panel and the -ve from the voltmeter to the -ve on the panel

For whatever reason, if your panels are not providing the results you expect, please contact us for further advice.

We want to make it easy for the DIY-curious to install their own solar power and reduce reliance on the grid.

We do that by 1) sourcing the highest quality A+ grade monocrystalline solar panels and supporting components at affordable prices 2) providing information on how to install solar systems by yourself in a concise and simple way.

We will only ever supply A-grade monocrystalline solar panels and high quality accessory items. Our products are sourced from all over the world, predominantly Western Europe and South Asia. We take pride in identifying the highest quality factories to manufacture our products.

We're a UK-registered company. Our head office address is 210 Mare Street, London, E8 3RD. Company number 13949136.

After each order, we'll send you an email with key order information and contact details. If an email has not been received, please check your junk folder.

Our reputation and customer service is extremely important to us. If you have any concerns about the quality of a product or service, please do not hesitate to contact us so that we can resolve the issue. You can get in touch with our support team via email: support@photonomy-solar.com

Deliveries are processed and dispatched within 1-2 working days. Free delivery is available on all orders over £30.

Orders within the U.K can take 5-7 business days to arrive. Further delivery details will be provided in your confirmation email. Our delivery partners are Parcelforce Worldwide and FedEx.

We will endeavour to honour every order, however some parts of the UK are currently outside of our delivery range such as the Channel Islands.

You can change or cancel your order anytime before it is dispatched. All queueing orders placed within our cut-off time of 13:00 (GMT) are packed and dispatched within 1-2 working days.

If your order has shipped and not yet been received, due to having been damaged or lost in transit, we will ship your order again at no extra cost, however no cancellation can be applied. Refund can be applied to your order until the item has been received and returned to the original sender address.

We accept all returns within 14 days of purchase. Returns must be unopened, in their original packaging and returned to the original sender address. Once received, refunds will be paid in full, minus any delivery costs.

All photonomy solar panels are covered by a 12 year product warranty, guaranteeing products are free from defects in workmanship during that period. Should a product be faulty due to workmanship, the product will be replaced at our cost. In the event of a faulty product, please contact our customer support: support@photonomy-solar.com