The 200W rating is based on Standard Test Conditions (STC) — ideal sunlight and temperature. In real-world use, factors like sun angle, high temperatures, shading, wiring losses, and device efficiency can reduce output. Power below 200W is normal and does not indicate a defect.

Simple Series Connection Steps:1. Connect the panels – Attach the positive (+) cable from Panel 1 to the negative (-) cable from Panel 2.2. Use the remaining leads – The unused positive from Panel 2 and negative from Panel 1 become your system output cables.3. Connect to your solar generator – Plug these output cables into the generator’s solar input port.Why series connection works:• Each panel outputs ~22.4V, so two in series provide ~44.8V total.• Voltage stays safely under most 60V power station limits.• Series connection improves MPPT efficiency for faster charging.• Current remains the same (~10.5A) while voltage doubles.Important tips:• Only connect identical panels together for best performance.• Use the included weatherproof connectors for a secure connection.• Face both panels in the same direction for optimal sun exposure.Do I need an extra controller?• No extra controller is needed when connecting directly to a solar generator or power station with a built-in MPPT controller — it automatically regulates voltage and current.• IF you are connecting the panels to a DIY battery system or a unit without an MPPT controller, a separate solar charge controller is Required to protect your batteries.

Yes, they do. There are four pre-drilled holes to make installing the solar panel quick and secure.