The solar array needs a reasonable amount of non-shaded, unobstructed sun, either for a roof or ground mounted system during peak daylight. A southern exposure is ideal, but east- and west-facing roofs can capture over 80% of the power of a south-facing roof . Geographically, while sunny climates are best, the difference in system output between places like California and Minnesota is only about 20%.

Almost all panels are guaranteed for 25 or 30 years, and experience has shown they last longer than that.

With increases in efficiency and lower cost, most homeowners and many businesses can offset 100% of their usage and, with battery storage, solar can often be the primary power source.

Typically 100 square feet of solar panels will generate 1,000 -1,440 kWh per year.

Grid connected systems can be configured with switching to allow continued home power during an outage. Otherwise, they immediately shut down to protect utility linemen as they work to restore power.

A standard set of tests ensures systems withstand winds up to 125 mph and 1-inch sized hail when the racking system and panels are installed to the manufacturer’s specifications.

Yes, though if you start with some battery backup, it is easier to add more than starting with none because battery systems use a different type of inverter.

Most states have laws prohibiting homeowners associations from preventing solar installations.

Residential installations typically take two to three days although larger and more sophisticated systems can take somewhat longer.  Power is interrupted only briefly so even more involved installations aren’t disruptive.

With batteries, solar can and frequently is the primary power source. Without batteries, the grid powers the home as it would without solar.

Under bright overcast, systems continue to generate 50 – 70% of typical output under.

Not really. While extremely hot climates decrease efficiency, increased daylight ultimately increases production. Conversely, panels operate more efficiently in colder climates, partially compensating for shorter days.  

Because system components have no moving parts and pass strict standardized durability tests, they’re extremely reliable and typically carry 20-30 year warranties. There may be an additional workmanship warranty covering the installation.  

Typically power flows to the home or battery first.

Net-metering is one common method of compensating owners for excess generation.

Excess power from grid tied systems flows to the electric provider. In months where the system generates a surplus, the difference or net, results in a credit determined by the electric provider. Net metering “credits” can be as little as the base rate the utility pays for wholesale power or as generous as the retail rate you pay as a customer.

Net metering is one of several methods to compensate system owners for excess generation which depend on geography and specific utility.

Federal: Homeowners are eligible for a 30% tax credit on the final cost of a solar energy system, after any state or local incentives. Commercial installations can qualify for up to 70% investment tax credits. There may be additional state, local and utility-specific incentives. Businesses can also depreciate solar systems using MACRS.

The total cost for purchasing and installing a solar energy system is based on system size and specific details, with some variance by state and locality within the state. In early 2024, averages range from a low average of $2.50/watt in Texas to $3.50 in Maine, before incentives. Average US system size is about 7 KW; Alternalux residential systems average from 15 – 25 KW.

No, you are not be taxed on solar energy system value as long as the energy produced is used for your property. 

Absolutely, provided you have the unshaded space.