What can these 0.32W panels actually power?

Small loads only: a single LED, a tiny motor, a buzzer or trickle-charging a small battery. They cannot charge a phone or run anything that needs meaningful wattage.

Can I connect the five panels together?

Yes. Wire them in parallel to keep 2V and add current (about 800mA total), or in series to raise voltage. Match polarity and use a diode if you charge a battery.

Do I need a charge controller?

Not for driving an LED or motor directly. For battery charging, add a small diode to stop backflow and keep the battery small, since total output is about 1.6W.

Are these panels weatherproof for outdoor use?

They are bare modules without a sealed enclosure, so mount them behind glass or in a housing if they will see rain. Indoor and covered projects are the safer use.

Is $15.49 a good price for five?

At about $3.10 per panel it is in line with other small hobby panels. Lowe's is the only new price found as of November 8, 2026, so compare per-panel cost before buying.