You should have received a link to your online invoice in your order confirmation email:

If you cannot find the confirmation email : 

• check your spam folder
• be sure which email you used when checking out on our website

You can also download your invoice directly from our website if you have created a customer account: 

Please, write your VAT Number after your company name (in the same field), separated by a "-" .

For example :

Name company : "Sunslice SRL - BE0680474695"

Please contact us at : sales@sunslice-solar.com

with following information : 

• Your order (products, color)
• Company details (company name + person of contact , VAT number, address)
• Normal or express shipping

We will send you an invoice by email. Your order can be paid on receipt of the invoice.

Indeed, this can happen.

Usually, two kind of taxes can be requested on receipt : 

• VAT
• Import duties

Before placing your order, please contact us at sales@sunslice-solar.com before proceeding to your order with following information :

• Your order (products, color)
  
• Company details (company name + person of contact , VAT number, address)
• Normal or express shipping

We will send you a Belgian VAT-exempt invoice. 

Please note VAT (with the rate of your own country) and import duties will still be requested at the reception of your order.

Our website allows :

• Credit card payments (VISA / MASTERCARD)
• Bancontact
• Paypal . Can we kindly ask to first consider the two options above before proceeding to Paypal payment. Indeed, a very high transaction fee is charged to us for Paypal payments... Thank you very much !

For bank transaction, please contact us at sales@sunslice-solar.com before proceeding to your order with following information :

• Your order (products, color)
  
• Company details (company name + person of contact , VAT number, address)
• Normal or express shipping

We will send you an invoice by email. Your order can be paid on receipt of the invoice.

You want to charge a specific device but you do not know what Sunslice product (solar charger, generator, powerbank, ...) you should buy to be able to do so ?

No worries : 

1. Please have a look at the technical specifications of the products on their product pages

2. Check if you can find the answer to your question in this FAQ

3. If you still do not know, you can send us an email at contact@sunslice-solar.com

PLEASE add a picture of the charger(s) of the device(s) you want to be able to power. Your charger will look like this for example and we need to be able to read clearly the written specifications on the charger.

Generally, all Sunslice products are water-resistant. This means they can be used in rainy conditions during a reasonable time. 

None of our products can be legally classified as waterproof (IP67) as we usually not have passed the needed tests to obtain these certificates. Why not ? Because of the expensive budget we prefer allow to R&D to effectively improve water-resistancy of our products. However, our products can be used in rainy conditions if not stipulated differently in its user manual.

Generally speaking : 

- Products containing a battery

1. Must not be drowned into water. In case this happens and you manage to get back your product, please dry it completely before turning it on or using it again. In case the charger continues working after the drying process, the devices you will charge with the Sunslice charger will not incur damages. The longevity of the Sunslice charger could be affected, though.
   
   
2. Can be used in rainy conditions, so do not worry if your device is hanging on your backpack for a while when hiking in the rain. Please consider drying the product afterwards to preserve its longevity.

- Products without battery 

1. Do not fear water conditions. Please consider drying the products afterwards to preserve their longevity.

In case your device takes more time to be charged up 100% by a Sunslice charger, this can either be due to a defaulting charger or because of inherent technical specifications of your device.

A smartphone with a larger battery, for example, will take longer to be charged, than a smartphone with a small battery. With time, smartphones integrate larger and larger batteries, which causes longer charging times for recent smartphones.

We constantly try, through enhanced R&D, to make our products evolve with the electronic developments on the market.

The quantitative features claimed by Sunslice about its products use standard devices (smartphones, cameras, tablets, ...) for comparison, like most of the actors in the charging industry do.

Be aware that some (more recent) devices can differ slightly or more significantly from the comparison devices. For example, iPhones will have other specifications than Android devices, according to their integrated battery, the energy consumption when using the phone, the charging speed, etc. Different models within the same brand will also differ on this specifications.

This table gives an idea of the amount of phone charges that can be obtained for a 4'000 mAh (e.g. the Photon) powerbank, depending on the phone model.

Be aware that some recent smartphone will not be able to be charged up 100% by the Photon as they have a very high internal battery capacity.

If a scratch appears on you solar panel, do not worry. Most of the scratches do not affect the solar charging speed. 

In case you notice a drastic change in the solar performances, you can contact us at service@sunslice-solar.com .

It depends.

We avoid providing useless cables as this contributes to electronic waste. So if it is not explicitely mentioned a cable is included when placing the order or on the product page, no cable will be added to your order.

In case you buy a specific cable on our website, we of course will add it to your order.

The differences between the nominal and actual capacity of a power bank are due to several technical and practical factors:

1. Voltage conversion : The nominal capacity of a battery is usually indicated in milliampere-hours (mAh) at a specific voltage (often 3.7V, which is the standard voltage for lithium-ion cells). However, to charge devices, this voltage must be converted to 5V, which is the standard output voltage for USB ports. This conversion causes energy losses, reducing the effectively available capacity.

2. Conversion efficiency : The internal circuits of the power bank convert the battery’s energy from 3.7V to 5V. This conversion is not 100% efficient and leads to an energy loss of 5-15%, or more for lower-quality models.

3. Internal resistance : The internal components of the power bank, including cables and connectors, lead to energy losses due to electrical resistance, especially when the current is high. This reduces the energy available for the device being charged.

4. Temperature : During charging or discharging, the battery can heat up, causing additional energy loss, particularly if the power bank is used in a very hot or cold environment.

5. Natural battery degradation: Over time, battery cells degrade, reducing their maximum capacity. An older power bank will therefore have a lower actual capacity than its initial nominal capacity.

These factors make the actual capacity often lower than the indicated nominal capacity.

• Always store charged
• Charge at least every 3 months to prevent battery damage
• In a dry place at ambient temperature

Understanding Solar Charging Times

When charging a device with a portable solar panel, several factors influence the total charging time. Our calculations consider the solar panel’s output, environmental conditions, and the charging characteristics of each device. Below is an overview of the key elements that affect solar charging performance.

0. Perfect theoretical conditions

In a perfect and theoretical world, the calculation of charging time is very simple :

Charging Time = Capacity (Wh) / Solar Power.

with Capacity (Wh) = Capacity (Ah) * 3.7V (example for smartphone : 3(000 m)Ah * 3.7V = 11.Wh

But be aware that even if this is a very quick way to have an estimation of the charging time, it is not correct because we are not living in a perfect theoretical world :-)To avoid this error, and more importantly to explain as best as possible why this is not correct, we have written this small article below. Don't panic if you are not able to calculate charging times yourself despite reading the article : estimation charging times are displayed below the article.

1. Solar Panel Power Output

Each solar panel has a peak power rating (e.g., 18W), but the actual power delivered to a device depends on real-world conditions. The key limiting factors include:

Sunlight Efficiency Losses

Not all the sunlight that reaches Earth is converted into usable power. Losses occur due to:

• Atmospheric filtering: The angle of the sun, the ozone layer, and other atmospheric effects reduce the sunlight intensity. We estimate a 10% loss.
• Internal inefficiencies: Power is further reduced due to USB conversion (8% loss) and cable resistance (2% loss).

Since these losses are multiplicative, the total efficiency factor is:

(1−0.10)×(1−0.08)×(1−0.02)=0.81(1 - 0.10) \times (1 - 0.08) \times (1 - 0.02) = 0.81(1−0.10)×(1−0.08)×(1−0.02)=0.81

This means the effective power available from the solar panel is:

Peak Power×0.81\text{Peak Power} \times 0.81Peak Power×0.81

Cloud Cover Losses

On cloudy days, less sunlight reaches the panel, further reducing efficiency. We estimate a 50% loss due to clouds, which combines with internal inefficiencies:

(1−0.50)×(1−0.08)×(1−0.02)=0.44(1 - 0.50) \times (1 - 0.08) \times (1 - 0.02) = 0.44(1−0.50)×(1−0.08)×(1−0.02)=0.44

So the effective power available under cloudy conditions is:

Peak Power×0.44\text{Peak Power} \times 0.44Peak Power×0.44

2. Device Charging Limitations

Each device has a maximum input power rating, meaning it can only accept a certain amount of power at once.

• A GoPro with a 1,500mAh battery (5.5Wh) has a maximum input of 5W. Even if the solar panel provides more power, the GoPro will not charge faster than 5W.
• A smartphone may accept up to 10-18W, depending on its fast-charging capabilities.
• USB Port Output Limitation: Even if a solar panel has a high overall wattage, each USB port has a maximum output. For example, the Fusion Flex 18 has two USB-A outputs, each limited to 13.5W (5V/2.7A). A device requiring more power than this will be limited by the port’s output.

3. Practical Charging Example

Example 1 : Charging a GoPro

Let’s take the Fusion Flex 18 solar panel (18W) charging a GoPro with a 1,500mAh battery (5.5Wh) and a maximum input allowed by the GoPro of 5W.

Step 1: Calculate Actual Solar Power After Sunlight Efficiency Losses

The total losses from sunlight efficiency include:

• Atmospheric filtering losses: 10%
• Internal inefficiencies (USB conversion + cable resistance): 8% and 2%

Since these losses are multiplicative rather than additive, the total efficiency factor is:

(1−0.10)×(1−0.08)×(1−0.02)=0.81% --> 19% losses.

This means the effective solar power is:

18W × 0.81 = 14.58W

Step 2: Check USB Port Output Limitation

• Each USB-A port on the Fusion Flex 18 has a maximum output of 13.5W.
• Since 14.58W > 13.5W, the actual available power per USB port is limited to 13.5W.

Step 3: Determine Charging Power for the GoPro

• The GoPro has a maximum charging input of 5W, meaning it cannot charge faster than 5W.
• Since 5W is lower than the available 13.5W, the GoPro will charge at 5W.

Step 4: Calculate Charging Time

• Charging time in full sunlight: 5.5Wh/5W=1.1 hours5.5Wh / 5W = 1.1 \text{ hours}5.5Wh/5W=1.1 hours

Step 5: Adjust for Cloudy Conditions

Cloud cover introduces additional 50% losses, which combine with internal inefficiencies. The total efficiency factor becomes:

(1−0.50)×(1−0.08)×(1−0.02)=0.44

Effective solar power in cloudy conditions=18W×0.44=7.92W

• The USB port limitation of 13.5W still applies, but since 7.92W < 13.5W, the effective available power is 7.92W.
• Since 7.92W > 5W, the GoPro still charges at 5W.
• Charging time remains: ~1.1 hours.

Example 2 : Charging a Smartphone

Now, let’s take the Fusion Flex 12 (12W) charging a smartphone with a 3,000mAh battery (11.1Wh) and a maximum charging input of 18W.

Step 1: Calculate Actual Solar Power After Sunlight Efficiency Losses

The Fusion Flex 12 has a peak power of 12W. Applying the total efficiency factor of 0.81 (accounting for atmospheric and internal losses):

Effective solar power=12W×0.81=9.72W

Step 2: Check USB Port Output Limitation

• Each USB-A port on the Fusion Flex 12 has a maximum output of 12W (5V/2.4A).
• Since 9.72W < 12W, the actual available power remains 9.72W (limited by sunlight efficiency, not the port).

Step 3: Determine Charging Power for the Smartphone

• The smartphone has a maximum charging input of 18W, meaning it can charge at up to 18W if enough power is available.
• The available power is only 9.72W, which is lower than the 18W the smartphone can accept.
• Final charging power: 9.72W (limited by available solar power).

Step 4: Calculate Charging Time

• Charging time in full sunlight: 11.1Wh / 9.72W = 1.14 hours

Step 5: Adjust for Cloudy Conditions

Using the total efficiency factor of 0.44 (cloud cover + internal losses):

Effective solar power=12W×0.44=5.28W

• The USB port limitation (12W) still applies, but since 5.28W < 12W, the effective available power is 5.28W.

• The smartphone can accept more than 5.28W, so it charges at 5.28W.

• Charging time in cloudy conditions:

  11.1Wh / 5.28W = 2.1 hours

Since the sun conditions are never really 100%, one can suppose the charging time for a smartphone will be between 1.14 and 2.1 hours.

We can ship worldwide thanks to BPOST, our trusted distribution partner. 

Please note that different areas are subject to different shipping tarifs and that import taxes may apply.

 Afghanistan, Åland Islands, Albania, Algeria, American Samoa, Andorra, Angola, Anguilla, Antarctica, Antigua and Barbuda, Argentina, Armenia, Aruba, Ascension, Asia/Middle East, Asia/Middle East/North Africa, Australia, Austria, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Bonaire, Saint Eustatius and Saba, Bosnia and Herzegovina, Botswana, Bouvet Island, Brazil, British Indian Ocean Territory, Brunei Darussalam, Bulgaria, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Canary Islands, Cape Verde, Cayman Islands, Central African Republic, Ceuta, Chad, Chile, China, Christmas Island, Cocos (Keeling) Islands, Colombia, Comoros, Congo, Congo. The Democratic Republic of the, Cook Islands, Costa rica, Croatia, Cuba, Curaçao, Cyprus, Czech Republic, Denmark, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Ethiopia, European Union, Falkland Islands (Malvinas), Faroe Islands, Fiji, Finland, France, French Guiana, French Polynesia, French Southern Territories, Gabon, Gambia, Georgia, Germany, Ghana, Gibraltar, Great Britain, Greece, Greenland, Grenada, Guadeloupe, Guam, Guatemala, Guernsey, Guinea, Guinea-Bissau, Guyana, Haiti, Heard Island and McDonald   Islands, Holy See (Vatican City State), Honduras, Hong-kong, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Isle of Man, Israel, Italy, Ivory Coast, Jamaica, Japan, Jersey, Jordan, Kazakhstan, Kenya, Kiribati, Korea (North), Korea (South), Kosovo, Kuwait, Kyrgyzstan, Lao. People's Democratic Republic, Latvia, Lebanon, Lesotho, Liberia, Libyan Arab Jamahiriya, Liechtenstein, Lithuania, Livigno, Luxembourg, Macao, Macedonia, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Melilla, Mexico, Micronesia. Federated States of, Moldova, Monaco, Mongolia, Montenegro, Montserrat, Morocco, Mozambique, Myanmar, Namibia, Nauru, Nepal, Netherlands, Netherlands Antilles, New Caledonia, New Zealand, Nicaragua, Niger, Nigeria, Niue, Non European Union, Norfolk Island, North Africa, Northern Mariana Islands, Norway, Oman, Pakistan, Palau, Palestinian Territory. occupied, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Pitcairn, Poland, Portugal, Puerto Rico, Qatar, Rest Of Africa, Rest of Europe, Rest of the world, Reunion, Romania, Russia, Rwanda, Saint Helena, Saint Kitts and Nevis, Saint lucia, Saint Martin, Saint Pierre and Miquelon, Saint Vincent and the Grenadines, Samoa, San Marino, Sao Tome and Principe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, South Georgia and the South Sandwich Islands, Spain, Sri lanka, Sudan, Sudan (South), Suriname, Svalbard and Jan Mayen, Swaziland, Sweden, Switzerland, Syrian Arab Republic, Taiwan. Province of China, Tajikistan, Tanzania. United Republic OF, Thailand, Timor-Leste, Togo, Tokelau, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Turks and Caicos Islands, Tuvalu, Uganda, Ukraine, United Arab Emirates, United States, United States Minor Outlying Islands, Uruguay, Uzbekistan, Vanuatu, Venezuela, Viet nam, Virgin Islands. British, Virgin Islands. U.S., Wallis and Futuna, Western Sahara, Yemen, Zambia, Zimbabwe

We do our best to ship you your orders as fast as possible!
 

For deliveries to Belgium, it usually takes between 24 and 72 hours. 

For other European countries, delays vary between 3 to 7 days depending on the speed of the local services. 

To the USA, delays usually take between 4 to 7 days.

Please note delays due to postal services can occur and are out of our control despite our best efforts!
During peak season (end of year especially), delays may be longer due to high volumes handling by our logistics partners and transporters.

To offer our customers the most advantageous shipping rates, we are mainly using BPost International mailing service. For express shipping or "exact deadline shipping" , please select "UPS express delivery" or "accelerated shipping" in the checkout settings.

After placing your order, you should have received an automatic confirmation email from us.

In this email, you can click the link "Follow my order" to get access to your order status and tracking updates.

We are very sorry for the delay.
Please consider waiting 2-3 days before worrying. We usually ship out within 24h after receiving an order,  but sometimes some additional time can be needed.

Please first check the tracking link that is included in the confirmation email you should have received when we shipped out your order. It also could be in another email, sent by us or by our transporter or logistic partner.
Please check your spams in case you cannot find any email with tracking link.

In case your order tracking link indicates that the shipment has not moved from a stage to another since more that 10 business days, please contact us at service@sunslice-solar.com .