A 5 kW solar system can produce very different amounts of electricity depending on location, sunlight, roof orientation, shading, equipment, weather, and system losses. That is why a single national production number can be misleading. How much electricity does a 5 kW solar system produce? A useful starting point is the system’s expected production ratio.…

Most residential solar panels are designed to operate for decades. The important distinction is that a panel’s useful life does not end on a specific birthday: its electricity output gradually declines over time. How long do solar panels last? A practical planning range for modern residential solar panels is about 25 to 30 years, and…

The solar payback period is the amount of time it takes for the financial savings from a solar system to recover the system’s net cost. It is one of the most useful calculations for comparing a solar investment with simply continuing to buy electricity from the grid. How do you calculate solar payback? A simple…

Short answer: There is no single national price that accurately describes every residential solar project. A home’s solar cost depends on system size, equipment, installation and permitting, financing…

Learn how to estimate the number of solar panels your home may need using electricity use, solar resource, system losses, and panel wattage.