Note that moderation is recommended. Especially when switching to soy milk on a regular basis. Consulting your family physician is also a good idea. Ask how much of soy milk you can drink in a day. Keep in mind avoiding the negative effects.
Solar panels have a lifespan of more than 20 years, depending on atmospheric conditions. They will pay for themselves in less than half of that time, and you will notice the reduction in your electric bill from the very first month.