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Dec 14
2010
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Part 3 in a series of 4 posts from Dr. Nicole Peill-Moelter, the Director of Environmental Sustainability at Akamai, in which she documents what she learned while deploying a solar system on her home in California. This segment covers financing options for solar systems, buy vs. lease and rebate and tax considerations. This is great stuff...thanks Nicole.
Financing Options
Now that you're nearly ready to call the sales rep, let's look at various financing options that are available.
PV solar companies now offer residential consumers financing options that make solar affordable for most anyone with sufficient electricity consumption, roof space and the right location. These options include outright purchase of a system and system lease (or power purchase agreement). What's best for you will depend on your situation including how long you plan to own your property, how much you can put down upfront and what your goals are, e.g., saving money or using renewable energy.
Outright Purchase
Outright purchase of a system may make sense for you if you can afford the capital outlay upfront and plan to be in your home for twenty or more years. For example, a 5.0 KW system can cost in the neighborhood of $30,000, not including rebates and tax credits. You are responsible for the maintenance, monitoring and repair of the system. Since there are no moving parts, systems are generally low maintenance, requiring only cleaning of the PV panels and keeping the panels free of shading. Although PV panels typically degrade less than 1% per year PV panels are warranteed for twenty years, and usually operate much longer than that. Inverters have 10-year warrantees. A twenty- to thirty-year amortization of your system usually results in a very favorable return on investment (ROI), e.g., energy costs of <$0.06/KWH. You can also borrow money for the system which will lower the ROI but can still make sense given the strong ROI for systems used for 20-30 years.
Even if you will be in your home less than 20 years, PV systems improve the property value so you can extract the residual value of the PV system when you sell. Some cities are considering incorporating financing of the PV system into the home's property tax thereby tying the system to the home not the original buyer which overcomes a common financing hurdle.
Because you will own the system and be responsible for its operation, repair and performance you should thoroughly vet the PV and inverter technology and manufacturers. For example, I learned that some cheaper PV panels can be of inferior quality resulting in leakage of the panels which decreases or ruins their performance. This is important if you want your system to last beyond the warrantee period. In another example, micro inverter technology enables conversion of the DC electricity to AC at each panel. The advantage of this is that if one panel is shaded or is not operating the other panels will still operate at full performance. This is not so when the panels are linked together connecting to a single inverter as is the case for most systems. If one panel is shaded or non-operable they all are. Micro inverters are more expensive but may be worth it in the long run - especially if your roof is shaded.
System Lease
For those who cannot afford or don't want to outlay the full capital cost of a system upfront, more and more companies are offering a system lease, or power purchase agreement. In this case the PV solar company owns, installs and is responsible for the system. It also guarantees the annual output of the system for the life of the lease which is likely to be 10-15% less than the actual output. One of the financial advantages of this purchase option is the PV
solar company can take advantage of the business writeoffs associated with the system such as equipment depreciation which is not the case for a private owner.
Lease agreements can range from zero down, 50% down to 100% down. The advantage of 100% down is there are no finance charges which lower the ROI. The lease allows you to lock in a guaranteed rate for your energy (KWH) which is not the case with your current situation. At the end of the lease you can opt to renew the lease or have the system removed.
Unlike a purchased system the PV and inverter technology is not so critical for a leased system. This is because the PV vendor guarantees the system output. So it doesn't matter if you have a Ferrari or a Honda on your roof, it will get you where you want to go.
Rebates and Tax Credits
State rebates and federal tax credits help offset the cost of a PV system. Rebates vary state by state and over time. In California the California Solar Initiative (CSI) rebate has been in place for years and subsidizes systems under 1 MW on a per watt basis, e.g., 35¢/Watt. This subsidy is reduced over time as the installed base of PV increases. The federal tax credit is 30% of the cost of the system and is realized in the year that the system is installed.
If you purchase the system you are eligible for these rebates and tax credits. If you lease a system you transfer the rights to these financial incentives to the PV vendor. These incentives in addition to capital equipment depreciation and other business deductions enable PV vendors to reduce the cost of a PV system to consumers.





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