When selecting solar panels, don't just go by price. Panels can vary by size, wattage, brand, warranty, performance and materials. Because of this, you should thoroughly research all the solar panels and select the highest quality one rather than the cheapest one. Purchase the highest quality panels that your budget will allow.
Keep your solar panels clean. If your solar panels are dirty or obstructed in any way, they won't work as well. Keep an eye on your solar panels and clean them if they're not quite looking their best. Hosing them down occasionally will ensure that they are much more efficient.