Solar Product Savings Calculator: How Much Do Solar Gadgets Actually Save You?

At Savzz, we help UK shoppers find working discount codes across hundreds of retailers, from home appliances and garden products to tech, outdoor gear, and beyond. Solar powered products are one of the fastest growing categories in UK retail right now. More people than ever are adding solar lights to their garden, buying portable generators from brands like Jackery, converting vans into off-grid living spaces, and offsetting their EV charging costs with rooftop panels.

The question most people cannot answer is simple: how much does it actually save me?

This calculator answers that question with real numbers. Enter your unit rate, toggle on any solar products you own or are thinking about, and see your annual saving, monthly saving, and CO2 avoided instantly.

Who Is This Calculator For?

This tool is useful for anyone using or considering solar powered products in the UK. It is particularly relevant if you are:

• A homeowner who already has solar garden lights, a solar charger, or a portable solar generator and wants to know what they are actually saving per year
• Considering buying a portable solar generator from brands like Jackery, Bluetti, or EcoFlow and want to understand the real ongoing saving before spending several hundred pounds
• Working from a garden office or converted shed and want to see how much you could save by powering it with solar rather than running a cable from the house
• Living the van life or converting a campervan and want to calculate what your roof-mounted solar setup saves you versus plugging into a hook-up or using shore power
• An EV owner with home solar panels who wants to see in real numbers how much of your charging cost the panels are offsetting
• Someone researching solar products who wants to understand the payback case before buying anything

Who Is This Calculator Not Suitable For?

• Anyone calculating full home solar panel ROI. This calculator covers products and portable systems. It is not designed to calculate the return on a full rooftop solar installation with grid export and feed-in tariffs. For that, Which and the Energy Saving Trust have dedicated tools.
• Commercial or agricultural solar buyers. The figures here are based on typical domestic use. Large scale systems with different usage profiles and tariff structures need a specialist calculation.
• Anyone on an Economy 7 or time-of-use tariff. The calculator uses a single unit rate. If your rate varies by time of day the actual saving from solar will differ depending on when your products are in use.

How to Use the Solar Savings Calculator

Enter your electricity unit rate at the top. The UK average is around 24p per kWh but your actual rate may be higher or lower depending on your tariff. Check your most recent electricity bill for the exact figure.

Then work through the six sections. Each one covers a different type of solar product or setup. Use the Don’t have button to remove anything that does not apply to you. Every remaining section contributes to your total annual saving, which updates instantly as you make changes.

The six sections cover solar garden and pathway lights, solar phone and device chargers, solar power banks, portable solar generators, garden office or shed solar, van life or campervan solar, and EV charging offset by home solar panels.

What Do Solar Garden Lights Actually Save Per Year?

Solar garden lights are the entry point for most people into solar products and they are often dismissed as token eco gestures. The numbers tell a more useful story.

Six solar pathway lights replacing 5W mains-powered equivalents, used for six hours per night across the year, save around 65 kWh of electricity annually. At 24p per kWh that is around £15.60 per year. Not a huge number, but the lights themselves often cost £15 to £30 for a set of six, meaning the payback period is under two years. After that they are saving money indefinitely with no running cost and no rewiring.

Scale that up to a fully solar-lit garden with 20 lights and the annual saving approaches £50 to £60, with zero ongoing electricity cost and no cables to run or maintain.

Solar Security Cameras and Doorbell Cameras: What Do They Save?

Solar‑powered security cameras and video doorbells have become one of the most common solar add‑ons for UK homes. Models like Ring Solar, Eufy Solar, and Arlo Solar eliminate battery charging entirely by keeping the device topped up year‑round.

A typical battery doorbell or camera uses around 2–4 kWh per year when charged from the mains. At 24p per kWh, that’s only 50p to £1 per year in electricity saved, but the real benefit is convenience. No ladders, no charging cycles, and no downtime. For homes with multiple cameras, the avoided charging time adds up quickly.

Solar security accessories are therefore less about financial payback and more about hands‑off reliability, especially for cameras mounted high on exterior walls.

Portable Solar Generators: Jackery, Bluetti, and EcoFlow Explained

The portable solar generator market has grown rapidly in the UK over the last three years. Brands like Jackery, Bluetti, and EcoFlow have brought genuinely capable systems to a consumer price point that was not available five years ago.

Here is what each brand is known for in the UK:

Jackery is the most recognised name in the UK portable solar generator market. Their Explorer range runs from 300Wh units suitable for camping trips and phone charging up to 2000Wh and beyond, capable of powering a fridge, television, and laptop simultaneously. The Explorer 1000 is their most popular model and a genuine workhorse for both van life setups and home backup use. Jackery panels are foldable and designed to pair directly with their generators.

Bluetti sits at the more powerful end of the portable generator market. The AC200P and AC300 models are popular with van lifers and garden office users because of their higher capacity and the ability to daisy-chain additional battery packs. Bluetti units tend to cost more than comparable Jackery models but offer higher continuous power output.

EcoFlow has built a reputation for fast charging, their DELTA series can recharge from solar in around two hours under good conditions, which matters when you have a limited window of sunlight. Their RIVER series is more compact and popular for camping and weekend use.

What all three brands share is the ability to power appliances that most people would not associate with portable solar. A 1000Wh generator can run a small fridge for eight to twelve hours, a laptop for twenty or more hours, and a coffee maker for several cycles. The Jackery Explorer 2000 Pro can power a kettle or microwave briefly. These are not emergency gadgets anymore, they are practical power solutions for off-grid living.

The calculator above shows how many times per week you fully recharge your generator via solar and works out the equivalent mains electricity cost that saves you each year.

Powering a Garden Office with Solar

The post-pandemic shift to home working has made the garden office one of the most common home additions in the UK. Most are powered by a cable run from the house, adding to the household electricity bill for lighting, a laptop, router, and heating.

A solar setup for a typical garden office, covering LED lighting, a laptop, and a router, draws around 150 to 250 watts during working hours. At six hours per day for five days per week across the year that comes to around 230 to 390 kWh annually. At 24p per kWh that is between £55 and £94 per year off your electricity bill.

A practical garden office solar setup for this level of use typically involves a 400W solar panel paired with a 1000 to 1500Wh battery storage unit. The upfront cost is around £600 to £900 for a quality system. At £70 to £90 per year saving, the payback period is seven to ten years. Lower electricity bills going forward and the flexibility to work without mains power makes it appealing to more people than the pure payback calculation suggests.

Van Life and Campervan Solar: What You Need to Know

Van life is the lifestyle trend that has made rooftop solar genuinely mainstream in the UK. Converting a panel van or motorhome into a liveable space almost always involves roof-mounted solar panels because the alternative, running on a leisure battery that needs regular hook-ups or engine charging is expensive and limiting.

A typical UK van conversion uses between 100W and 400W of roof-mounted solar. Here is what each level covers in practice:

100W: Enough for LED lighting, phone and laptop charging, and a small 12V fridge on longer summer days. Tight on cloudy UK days and not enough for a larger fridge or heating system. Good for weekend use or as a starting setup.

200W: The most common setup for full-time UK van lifers. Covers LED lighting, laptop, phone charging, a 12V compressor fridge running continuously, and some USB device charging. Comfortable in spring and summer. Tight in December and January without supplementary charging.

400W: A comfortable full-time setup for most UK conditions. Covers all of the above plus a diesel heater controller, camera charging, and other small devices. Many full-time van lifers run 400W paired with a 200Ah lithium battery for reliable power year round.

600W and above: Larger motorhomes, horse boxes, and converted buses. At this level you are powering everything including a small inverter for mains appliances, water pump, and climate control systems.

The saving calculation in the solar calculator is based on the solar generation offset against the cost of buying the equivalent electricity from a hook-up or shore power connection at a campsite, which typically costs between 30p and 50p per kWh. At that rate the saving from generating your own power is higher than the household electricity saving would suggest.

Solar and EV Charging: The Free Fuel Calculation

If you have home solar panels and an EV, charging your car during daylight hours using solar generated electricity is one of the best financial combinations available to UK homeowners right now.

The maths is straightforward. The average EV uses around 3.5 miles per kWh of electricity. Someone driving 150 miles per week needs around 43 kWh per week to charge their car. At 24p per kWh from the grid that costs around £10.32 per week or £536 per year.

If 50% of that charging comes from home solar during daylight hours, the annual saving on EV charging alone is around £268. At 75% solar offset it reaches £402 per year. For someone who works from home and can charge during peak solar hours, a higher offset percentage is realistic for most of the year.

The calculator uses your weekly mileage and estimated solar offset percentage to work out this saving alongside your other solar products, giving you a combined annual total that reflects the full picture of what solar contributes to your household finances.

Are Solar Products Worth Buying? The Payback Question

Whether solar products are worth buying depends on how you measure worth. Here is a straightforward breakdown by product type:

Solar garden lights (£15 to £50 for a set): Payback period of one to three years depending on what they replace. After payback they cost nothing to run. Worth it for almost everyone with outdoor space.

Solar phone charger (£30 to £80): Small annual saving of £1 to £5 from the electricity avoided. Worth it primarily for camping, travel, and emergency use rather than pure electricity saving.

Solar power bank (£40 to £120): Similar to the charger. The electricity saving is modest but the usefulness outdoors and in power cuts makes the case on functionality rather than pure financial return.

Portable solar generator, 1000Wh (£600 to £1,000): Annual saving of £50 to £150 depending on use. Payback period of four to ten years on electricity saving alone. The case is stronger when you factor in the cost it saves on campsite hook-ups, generator fuel, or the value of having backup power at home.

Garden office solar setup (£600 to £900): Annual saving of £55 to £94. Payback period of seven to ten years. Worth it if you work from the office regularly and plan to stay in the property long term.

Solar water heater / immersion diverter (Myenergi Eddi, Solar iBoost+): If you already have rooftop solar panels, an immersion diverter is one of the strongest financial upgrades available. Instead of exporting excess solar to the grid for a few pence, a diverter sends that energy into your hot water tank.

A typical UK household can divert 800–1,500 kWh per year, worth £190 to £360 at 24p per kWh. With device costs around £300 to £500, the payback period is often 1.5 to 3 years, making it one of the fastest‑returning solar add‑ons currently available.

Van life rooftop solar (£300 to £800 installed): Annual saving of £200 to £600 depending on usage compared to campsite hook-up costs. Payback period of one to three years for full-time van lifers. One of the clearest financial cases for solar at this price point.

Tips for Getting Solar Products at the Best Price

• Buy Jackery, Bluetti, and EcoFlow during their sale events. All three brands run regular promotions, especially around Amazon Prime Day in July, Black Friday, and their own brand sale events. Discounts of 20% to 45% on generator and panel bundles appear several times per year.
• Buy solar garden lights in multipacks. The per-unit price on a set of ten or twenty lights is almost always lower than buying individual lights. End of summer sales in August and September bring the best prices on garden solar lighting.
• Check Savzz before buying any solar product from a UK retailer. We list working discount codes for home appliance retailers, garden and outdoor brands, and tech stores where solar products are stocked. A working code can take 10% to 20% off an already discounted price.
• Look for bundle deals on generators and panels. Jackery and Bluetti both sell bundle packages combining a generator with matching solar panels at a lower price than buying separately. These are almost always the best value entry point for a portable solar setup.
• For van life solar, buy the panels and batteries separately from specialist suppliers. Van conversion solar panels from specialist suppliers like Bimble Solar or Photonic Universe are often cheaper than branded portable panel equivalents at the same wattage. A 200W rigid panel for a van roof typically costs less than an equivalent foldable portable panel.

The Smarter Way to Go Solar: Calculate First, Then Find a Code

The calculator gives you the real annual saving based on your specific situation. Once you know which products make sense for you, the next step is making sure you are not paying more than you need to.

At Savzz we round up working discount codes for home appliance retailers, garden and outdoor brands, and tech stores across the UK. Whether you are buying your first set of solar garden lights or investing in a Jackery generator for your van conversion, search Savzz before you checkout. There is a good chance we have a code that will bring the price down.

Browse our garden and outdoor deals, home appliance vouchers, and gardening promo codes for current offers on solar and outdoor products.

Frequently Asked Questions

How much do solar garden lights save per year in the UK?

It depends on how many lights you have and what they replace. Six solar pathway lights replacing 5W mains equivalents save around £15 per year at the current UK average rate. Twenty lights save around £50 per year. The bigger saving is in installation, solar lights need no wiring and no ongoing electricity connection.

Is a Jackery worth buying in the UK?

For camping and off-grid use, yes for most people. For home backup and garden office power, it depends on how often you use it and how much electricity it replaces. The calculator above lets you enter your generator capacity and weekly solar recharges to see the exact annual saving. A Jackery Explorer 1000 used three times per week saves around £50 to £90 per year on electricity depending on your unit rate.

Can a portable solar generator power a full house?

No, not a typical UK home. A 2000Wh generator can power a fridge, television, laptop, and lighting for several hours but cannot run high-draw appliances like electric ovens, showers, or tumble dryers for meaningful periods. It is designed for selective essential power rather than whole-home supply.

How much solar do I need for a van conversion in the UK?

For a basic setup covering lighting, phone and laptop charging, and a small fridge, 200W of roof-mounted solar with a 100Ah lithium battery is a practical starting point. For full-time living in all seasons, 400W of solar with a 200Ah battery is more comfortable. The UK’s limited winter daylight means a higher capacity system pays back faster for full-time van lifers.

Can I charge my EV with solar panels?

Yes, if you have home solar panels and charge during daylight hours. The saving depends on how many miles you drive, your EV’s efficiency, and what percentage of your charging happens during solar generation hours. The calculator’s EV section shows your annual saving based on your actual mileage and estimated solar offset percentage.

What is the best time of year to buy solar products in the UK?

Amazon Prime Day in July and Black Friday in November are consistently the best times for portable solar generators from Jackery, Bluetti, and EcoFlow, with discounts of 20% to 45% appearing reliably. Solar garden lights are cheapest in August and September as retailers clear summer stock. Checking Savzz year-round catches promotions outside the main sale windows too.

Who built this calculator?

The Savzz Solar Product Savings Calculator was built by the team at Savzz.co.uk, a UK discount code and money-saving site. We built it because most solar saving calculators online focus entirely on rooftop panel installations and ignore the growing market for portable generators, garden office setups, van life solar, and EV charging offsets. This calculator covers all of them in one place. It is completely free with no sign-up required.