Allpowers SP001 21W
21W foldable and ultralight: the little solar panel that maintains a 12V battery and charges phone or power bank anywhere, with no socket or bulk.
Characteristics
- Power: 21 W (monocrystalline)
- Outputs: 12V and USB 5V
- Format: Foldable, ultralight
- Use: 12V battery maintenance, phone, power bank
- 21W foldable, 12V + USB outputs, light
Detailed overview: Allpowers SP001 21W 12V portable solar panel
The Allpowers SP001 is an ultralight 21 W foldable solar panel, designed for top-ups and maintenance. It is aimed at those who want a small, genuinely portable solar energy source: keeping a 12V battery in shape, or charging a phone and power bank far from any socket.
Its flagship use is maintaining a 12V battery. Placed on the dashboard or windscreen of a rarely-used car, a motorcycle or a motorhome in storage, it offsets the battery's natural self-discharge and avoids the nasty surprise of a no-start. It is a particularly useful accessory for classic cars, second vehicles or long parking periods.
It offers two types of outputs: a 12V output for battery maintenance via the supplied clamps or cigarette-lighter plug, and USB 5V ports to directly charge a phone, tablet or power bank. Its monocrystalline cells offer good efficiency for this compact format.
Folding into several sections, it takes on a very compact format that slips into a bag, a glovebox or a backpack, and deploys in an instant. Its featherweight makes it pleasant to carry day to day.
Keep in mind that a 21 W panel is meant for top-ups and maintenance, not fast charging: output depends heavily on orientation and sunlight. Light, discreet and practical, the Allpowers SP001 21W is a clever accessory to avoid flat batteries and keep your small devices charged on the move.
Our tester's review: Julien De Jurquet
The SP001 is a clever little accessory you end up always keeping in the boot. Its primary purpose, maintaining a parked 12V battery (a rarely-used car, a motorcycle, a motorhome in storage), it fulfils very well: placed on the dashboard or windscreen, it offsets self-discharge and avoids the nasty surprise of a flat battery. Its USB 5V outputs also help out charging a phone or power bank during a break out in nature. We like its foldable format and featherweight, which make it easy to take along and store. The limits are obvious and accepted: with 21 W, you are in top-up and maintenance territory, not fast charging, and like any panel, orientation and sunlight make all the difference. To keep a battery charged or help out your small devices, at this sale price, it is a genuinely useful accessory.
Frequently asked questions: Allpowers SP001 21W 12V portable solar panel
It is mainly for maintaining a 12V battery (a rarely-used car, a motorcycle, a motorhome in storage) by offsetting its self-discharge, and for charging a phone or power bank via its USB 5V outputs. It is a top-up accessory, not a fast charger.
Yes, thanks to its USB 5V ports, it directly charges a phone, tablet or power bank in the sun. With 21 W, charging stays slow and depends on sunlight, but it is very handy for portable top-ups.
Yes, it folds into a very compact, ultralight format that slips into a glovebox, a bag or a backpack. It deploys in an instant and sits easily on a dashboard or on the ground.
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Published on 10/07/2026