If you're thinking about using solar, Harbor Freight is NOT your friend, nor are their panels particularly inexpensive in a dollar per watt analysis. Generating electricity from sunlight requires direct sunlight, not just ambient reflected light coming in through a window.
Being a rental tenant, I would suggest your options are rather limited by what is in your lease agreement. I would suggest you start with the basics and obtain a Kill-A-Watt device and determine where you are spending your money on electricity. There are plenty of modern electronic devices which quietly use energy and drive your electric bill up, whether you are actually using the device or not. Unplugging devices or putting them on a switched power strip is cheaper than spending money to collect sunshine. I spent several months lowering my consumption before I ever started collecting sunshine.
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