There are several corporations that sell module components. Each company offers modules with different strengths for different prices.
Offers cheap poor quality components.
Offers affordable components with a combination of very low emissions and reasonable efficiency.
Offers durable components, with high strength, sometimes sacrificing performance.
Offers the most efficient components.
Offers unparalleled strength of components.
High quality components for high prices, focusing on extremely low emissions.
Expensive but quality components, with low power consumption.