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4.77 out of 5
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  • 23/02/2022

    It arrived well packaged and delivery was quite fast. Features a sealable pouch to store cables or thin USB devices. The two output ports line inside the pouch. Output port support up to 9V. It is waterproof and the build quality is pretty good. The SP-B21 model doesn't come with any accessory such as carabiners or charging cable. By using carabiners you can hang this solar panel to a backpack and use it during walking. Unlike other solar panels, this can be folded while the carabiners are attached. Solar panels are more efficient if the panels are at a 90 degree angle to the sunlight beams. I adjusted the panels at almost a 90 degree angle to the winter cloudy sun, ran a test and got a max of 1.5A 5V output power. It wasn't the sunniest day so in summer sun the output power will be greater than this. I'm a big fan of solar power so the iMars SP-B21 is very beneficial while camping. I'm happy with this portable solar panel USB charger because I can always charge my Li-ion Ni-MH batteries and phones during the day. The brand also has more powerful chargers with four panels and DC output for laptop charging. I suggest to use solar panels in combination with a power bank or a smart battery charger.

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  • 09/05/2022

    Quick delivery and no hassles. The equipment even works through the windshield and with clouds in the sky (it's known to be a long charge). Today, the first field tests in the full sun. However, quick charging also works needed strong sun. I am very happy with the purchase so far, we will see how it goes with the endurance.

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  • 21/03/2022

    Purchased merchandise came in 5 days, it's a pretty great result! Thanks a lot, the equipment's working, and I hope it lasts as long as possible. It was hard for me to get the nominal parameters but I checked straight away: 21.03.2022 hours. 16, cloudless skies, I managed to get at the top (depending on the angle of setting relative to the sun rays) of up to 1.5 A. An average of 170mAh in 10 min. This value will be even better in the summer. Maybe someone could use that data. Overall the equipment a bit smaller than the A4 card, light, for camping or going out into the mountains to recharge powerbank is sure to come in handy as an alternative in case of a "W". Thank you again.

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  • 24/02/2022

    I got this in time and in perfect condition. Really high quality material. It charged my phone even in dim light, however, I have not fully tested it yet but seems to work. There are two regular USB connectors in the top pouch. Also it comes with small loops to attach it on something.

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  • 10/12/2021

    Seriously, I am amazed by the quality or the product (and packing). I wasnt able to use it ( i just got it and its dark) but the quality is just great. I will try to use it during day and will add how it works.

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  • 06/04/2022

    Заряжал Redmi note 8 pro смартфон был включен, в пасмурную погоду, переменной облачности - за 1,5 часа зарядился на 12% считаю это нормальным.

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  • 11/02/2022

    Towar cały z małą skazą mam nadzieję ,że będzie działać.Dziękuje za szybką realizację.Sprawdzajcie dokładnie towar przed wysyłką ,aby uniknąć takich sytuacji.

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  • 04/03/2022

    Evertyhing fine, looks like good quality, a bit more quality needed near charging ports. But for this price pretty nice. The charging in sun is really slow, so looks like not 21wats but like 13-15wats in total.

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  • 21/06/2022


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  • 19/04/2022

    Made well, even in bad weather it charges my phone.So far so good.

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