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Solar Power Systems
There are three primary types of solar electric power systems which can be integrated into your residence or business. One is called a "utility-tie" system, the other is called a "utility-interactive" system and then what we commonly call a "stand alone" system. Read below for more information about the differences between these types of solar electric systems.

Utility-tie (or Grid-tie)
This system does not have a battery or related battery equipment. It has one function only. It feeds all electric power generated by the solar panels through a synchronous utility-grade inverter and offsets the power you would normally consume from the utility company. It slows, stops or reverses your utility meter depending on the time of day, the loads present and the size of the solar system installed. This is an extremely popular system because there are no batteries to replace and the system costs less than its "utility-interactive" counterpart. It essentially wakes up in the morning and shuts down in the evening. For areas where there are few utility power failures or if you already have a back up generator this is an ideal system. These systems start at about $4,500 for a small entry-level, but expandable unit to tens of thousands of dollars depending on the size. They are simple in nature, comprised primarily of the solar panels and synchronous utility grade inverter.
 

Utility-interactive
This system has a battery and additional controls. It can both, (1) feed into the utility meter to slow or reverse it when excess power is present, and (2) it can provide back up power during utility failures. This is basically the same type of system used in homes that are completely off-grid. Depending on the size of this system and the appliances or devices requiring power it can support an entire home or just the items that are considered the most necessary during power failures. These systems are more expensive because of the battery reserve capacity and additional controls required in the system. Typically, depending on the amount of battery reserve these systems cost about 30% or more than a comparable utility-tie system, however in areas with frequent utility failures these fully automatic, silent power systems can be a great advantage. These systems start at about $5,000 to $7,000 for a relatively small, but expandable system.

Stand alone
A stand alone system is typically used when there is no public utility power available. A fueled generator is often used for supplemental short term support or to shave peak loads, but otherwise this system is fully independent of the power grid and thus there is no interaction whatsoever with the public grid. The size of the solar array, other system components and the battery reserve capacity is dictated by the electrical usage of the property, the amount of reserve for periods of little or no sun and the climatology of the area. These systems start at about $5,000 to $7,000 for a relatively small, but expandable system, however very small cabin sized systems can be as low as $2,000.

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