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What are portable solar batteries?
Portable solar energy storage systems have entered the market as an efficient, innovative, and sustainable solution for energy consumption. They’ve become a practical, easy-to-access clean energy alternative that’s gaining ground among the options for making the most of solar power while engaging in outdoor activities.
These devices store electrical energy from small solar panels —either built-in or external. In turn, they can power or charge devices such as small appliances, mobile phones, and even low-demand electrical installations.
They’re easy to transport and operate. That’s why their designs are becoming increasingly compact and lightweight, aiming to make them practical and portable —perfect for use while travelling, hiking, or during emergencies when no power outlets are nearby.
How do they work?
Pure simplicity. Their operation is straightforward, yet highly effective and efficient. Small solar panels (integrated or connected) capture solar energy and convert it into electricity through the photovoltaic effect. This electricity is then stored in the portable solar battery —most often lithium-based— offering high energy density and greater durability.
Some models include AC outlets, DC outputs, or USB ports, allowing you to charge a wider range of electronic devices. Other batteries can be charged via the power grid when there’s no sunlight, helping optimise charging time and making them more flexible as a tool.
Are portable solar batteries worth it?
That depends on how you plan to use them. If you often do outdoor activities, travel frequently for work or leisure, live in areas where the electricity supply is irregular or prone to outages, or simply need a backup or auxiliary power source, then portable solar batteries will be worth it and a very useful investment.
They’re an ideal complement to a home or travel emergency kit. Plus, their use contributes to a more decentralised, cleaner ‘energy routine’.
There’s no doubt these batteries are a valuable resource for adventurers and those living in or frequently visiting rural areas. However, they’re not powerful enough to cover the electricity needs of an entire home; Their speciality is low-power consumption.
Here are more reasons why these small energy generators are worth it:
They make better use of energy
By running on solar power, they don’t depend on grid electricity and can take advantage of peak sunlight hours for charging —then supply stored energy at night or on cloudy days, making them sustainable. They use clean, free energy (i.e., from the sun) to power your devices without consuming electricity from conventional sources.
Some models feature smart charge controllers to optimise performance and prevent energy loss.
They help lower your electricity bill
Yes, they can also save you money on your home electricity bill. Still, the impact will depend on the battery’s size and capacity, as well as how often and for what purposes you use it. They can complement a home system and help optimise self-consumption.
Although they’re designed mainly for outdoor use and short charging periods, portable solar batteries can also serve as a household backup, charging mobile phones, game consoles, and laptops or powering low-demand LED lighting —savings that can add up over time.
If your goal is to significantly reduce home electricity costs, the best option is to install a home photovoltaic self-consumption system and take advantage of the plans and rates Endesa offers —especially the Tu Casa Solar Virtual rate. This particular plan gives you all the benefits of self-consumption without the need to install solar panels, saving you the hassle of construction and administrative procedures.
They’re not expensive
They are getting cheaper. With more designs and models on the market, portable solar battery prices have become more competitive. Therefore, you have the possibility of finding very affordable options —always depending on their storage capacity and features.
Of course, the simplest models, designed just for charging phones, will cost less than high-capacity, high-performance units capable of powering larger appliances and laptops. Their durability and the savings they can generate at home can offset the initial investment.
Prices for this type of battery generally range from €100 to €500 or more, depending on storage capacity, connection ports, weight, ease of use, size, durability, and other factors. And… what’s truly priceless is their positive environmental impact.
They take up little space
Compact, lightweight, and durable designs —combined with practicality and ease of use— are among their top qualities, making them perfect to carry in your pocket or backpack while hiking or in your luggage during business trips.
Some weigh just over one kilogram —ideal for charging a phone or tablet— while others are larger and weigh between 5 and 10 kg, making them perfect for laptops and small appliances.
They require no maintenance
Maintenance is minimal; just clean the small solar panels regularly to remove dust or dirt that could block sunlight. Always store them in dry, cool, well-ventilated spaces after use.
It is important to avoid letting them fully discharge —especially if they use lithium batteries. There’s no need to completely drain them before recharging.
If properly used and maintained, a portable solar battery can last up to 10 years.
Key points to consider when choosing a portable solar battery
To make the right purchase for your needs, consider these key factors:
- Battery type: Lithium batteries are usually lighter and more durable than lead-acid batteries.
- Storage capacity (Wh or mAh): you should know how much energy can be stored, because more capacity means you can charge more devices —and the more recharges you’ll get.
- Output power (W): Determines the type and model of devices you can connect.
- Solar charging time: Knowing how long it takes to recharge the battery using solar panels or using a plug before it’s ready to use again is an important aspect to consider. Some models take longer than others to fully charge with solar power.
- Compatibility with external solar panels: Some models come with extra panels you can connect to speed up charging. Panels can also be purchased separately.
- Weight and size: this is an essential point to check if you’ll use it often for trips and outdoor activities, as it affects portability.
- Number and type of outputs: USB, AC, DC, wireless charging, and other options make the battery more versatile.
Tips for getting the most out of your portable solar battery
Follow these tips to maximise the performance and extend the lifespan of your device:
- Find an optimal charging location. Place panels where they get the best sun exposure during peak sunlight hours.
- Avoid frequent full discharges. While lithium batteries can handle it, it’s best to keep them between 20% and 80% charge. Avoid overcharging and use original or compatible chargers.
- Keep solar panels clean to maximise energy capture and ensure a full battery charge for better performance.
- If you won’t use it for a while, store it with a partial charge (about 50%) in a dry place away from extreme temperatures.
- Use responsibly. This includes avoiding connecting devices that exceed the battery’s maximum output capacity. Remember to always check specifications before plugging in.
Portable solar batteries have entered the market as a versatile, affordable, sustainable, and efficient way to harness solar energy in your everyday life. They offer the convenience for travel and outdoor activities, reduce your energy footprint, and can even help you save money on your electricity bill —all while keeping your devices charged.
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You don't need to adapt to Endesa's tariffs because they adapt to you. If you go to our catalogue you can compare the different tariffs for yourself. Or if you prefer, you can answer a few questions and we will take care of comparing all the different electricity and gas tariffs and then make a customised recommendation.
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