Tips on Choosing Solar Chargers
Several popular solar panel options are available:
- Panels only, either rigid or semi-flexible
- Panels with integrated storage batteries
- Panels with independent (separate) storage batteries
The main variables to consider:
Surface area: The larger the solar panel, the more sunlight it collects and the faster it gets converted to power stored in a battery. A smaller panel, though easier to pack, takes longer to charge a battery. Large surface area is also best for conditions such as cloud cover or the low-angled, low-intensity light in winter, or when logistical constraints limit how long you can have it exposed to sun. Charge times can vary from 4 to 16 hours of sunlight for the same battery, depending on surface area and light conditions.
Output capacity: Solar panels are rated in watts. The higher the number, the more electricity is generated during a given time period.
Semi-flexible or rigid panels: Semi-flexible solar panels can be folded or rolled up for easy transport and open up to provide a greater surface area than many rigid panels. Consider, too, a solar panel’s attachment options so you can securely attach it to your backpack, bike, kayak or tent.