A 200w solar panel typically measures around 1.5 meters in length and 1 meter in width. The exact dimensions may vary depending on the manufacturer and the specific model of the panel. However, some portable 200 watt solar panels may be more compact. For example, Anker 531 Solar Panel is only 570 x 602 x 60 mm when folded and 602 x 2130 x 20 mm unfolded. This size allows for efficient capture of sunlight and generation of electricity, making them a popular choice for residential and commercial applications.

The solar panels 200 watt can produce up to 200 watts of power under ideal conditions. However, the actual power output may vary based on factors such as sunlight intensity, angle of installation, and environmental conditions. On average, a 200watt solar panel can generate around 500-800 watt-hours of electricity per day. This is enough to power small appliances, charge electronic devices, and meet basic energy needs in various off-grid or portable applications.

The number of batteries you need for a solar panel 200 watt system depends on your energy storage requirements. To determine the number of batteries, you'll need to consider factors such as how much power is generated, the battery capacity, voltage, and desired backup power duration.

Generally, for 200 watt solar panel kits that produce around 500w to 800w power per day, you could consider using 1 or 2 500Wh deep cycle lithium batteries to store the energy generated, or choose Anker portable power stations with LifePo4 batteries for long-term storage and use.

A solar panel for 200 watts has the potential to run a 12V fridge depending on the fridge's power consumption and usage. It's essential to consider factors such as the fridge's energy efficiency, compressor starting current, and daily usage patterns. To ensure optimal performance, it's better to use two 200watt solar panels or four 100w solar panels like Anker Solar Panel 625, or you may need to supplement the 200 w solar panel kit with a battery bank for energy storage, especially during low sunlight periods.

A solar panel 200w system can provide a decent amount of power for an RV, depending on your energy needs. For example, it can help charge your RV batteries and run essential appliances like lights, fans, and small electronics.

However, the sufficiency of 200 w solar panels will vary based on your power consumption, the size of your RV, the duration of your trips, etc. To ensure the 200 watts solar panel provides enough energy for all your RV needs regardless of the weather, it's better to use solar generators together for peace of mind on the road. 

If you also want to use this panel for home backup, you can connect it to a solar battery that supports your whole-house generator.