As a renewable energy specialist, I have a deep understanding of the solar industry and its pricing trends. The cost of a solar system can vary greatly depending on a multitude of factors such as the location, the quality of the equipment, the installation process, and the current market conditions. Let's delve into the specifics of what influences the cost of a 4kW solar system.

Solar Panels: The panels themselves are a significant part of the cost. High-efficiency panels tend to be more expensive but can generate more electricity over their lifetime, which can offset the higher initial cost.

Inverters: Inverters are crucial as they convert the DC power produced by the solar panels into AC power for your home. The type of inverter—string, microinverters, or power optimizers—affects the cost.

Mounting Systems: The method of mounting the panels can also affect the price. Roof-mounted systems are common, but ground-mounted systems may be necessary for some properties and can have different costs.

Labor Costs: The cost of labor can vary significantly by region and the complexity of the installation. Some areas may have higher labor rates, and more complex installations will naturally cost more.

Permits and Inspections: These are necessary for a legal installation and can add to the cost. Some installers include these in their quote, while others may charge separately.

Local Incentives and Rebates: Many regions offer incentives to encourage solar adoption. These can significantly reduce the out-of-pocket cost for homeowners.

Solar Tax Credit: The federal investment tax credit (ITC) in the U.S. allows homeowners to deduct 26% of the cost of installing a solar energy system from their federal taxes, which can greatly reduce the net cost.

Considering the information provided, as of March 2017, the cost for a 4kW solar system in the U.S. ranged from $2.95 to $3.50 per watt. This translates to a pre-tax credit cost of between $11,800 and $14,000. However, this figure is outdated, and the actual cost today could be lower due to technological advancements and increased competition in the market.

It's important to get multiple quotes from different installers to compare not only the price but also the quality of the equipment, the warranty, and the reputation of the company. Additionally, consider the long-term savings and environmental benefits that a solar system can provide.

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How much does a 4kW solar system cost fully installed? 4kW (kilowatt) solar systems typically sell in the US (as at March 2017) for between $2.95 and $3.50 per watt meaning a cost of between $11,800 and $14,000 before the 30% solar tax credit.read more >>