(a)  The tax credit on each system as provided for in this chapter shall be determined as follows:

(1)  Photovoltaic systems:

(i)(A)  Photovoltaic systems shall have a minimum module size of twenty-four (24) square feet; and

(B)  Be connected to a battery storage system or be grid interconnected;

(ii)  Qualifying systems shall receive a tax credit of:

(A)  Twenty-five percent (25%) of the cost of the system.

(iii)  The maximum cost of the system shall not exceed fifteen thousand dollars ($15,000); provided, systems costing more than fifteen thousand dollars ($15,000) will receive a tax credit based on a fifteen thousand dollar ($15,000) system cost.

(2)  Solar domestic hot water systems:

(i)(A)  Solar domestic hot water systems shall have a minimum collector area of thirty-four (34) square feet; and

(B)  A solar storage tank that is at least eighty (80) gallons.

(ii)  Qualifying systems shall receive a tax credit of:

(A)  Twenty-five percent (25%) of the cost of the system.

(iii)  The maximum cost of the system shall not exceed seven thousand dollars ($7,000); provided, systems costing more than seven thousand dollars ($7,000) will receive a tax credit based on a seven thousand dollar ($7,000) system cost.

(3)  Active solar heating systems:

(i)(A)  Active solar space heating systems shall have a minimum collector area of one hundred twenty-five (125) square feet; and

(B)  A system for storing and/or distributing the heat to the living area of the house.

(ii)  Qualifying systems shall receive a tax credit of:

(A)  Twenty-five percent (25%) of the cost of the system.

(iii)  The maximum cost of the system shall not exceed fifteen thousand dollars ($15,000); provided, systems costing more than fifteen thousand dollars ($15,000) will receive a tax credit based on a fifteen thousand dollar ($15,000) system cost.

(4)  Wind energy systems:

(i)(A)  Wind energy systems must have a rotor diameter of at least forty-four inches (44?); and

(B)  Have a minimum factory rated output of at least two hundred fifty (250) watts at twenty-eight (28) mph.

(ii)  Qualifying systems shall receive a tax credit of:

(A)  Twenty-five percent (25%) of the cost of the system.

(iii)  The maximum cost of the system shall not exceed fifteen thousand dollars ($15,000); provided, systems costing more than fifteen thousand dollars ($15,000) will receive a tax credit based on a fifteen thousand dollar ($15,000) system cost.

(5)  Geothermal systems:

(i)  Geothermal systems must have either a coefficient of performance of 3.4 or greater or an efficiency ratio of sixteen (16) or greater. All geothermal systems must have a commissioning sign-off by the manufacturer or distributor of the equipment to verify the proper installation and performance of the system. All geothermal systems must meet the following standards:

(A)  ARI/ASHRAE/ISO-13256-1 for water to air geothermal systems;

(B)  ARI/ASHRAE/ISO-13256-2 for water to water geothermal systems;

(C)  ARI/ASHRAE/ISO-13256 GWHP for groundwater heat pumps;

(D)  ARI/ASHRAE/ISO-13256 GLHP for closed loop heat pumps;

(ii)  Qualifying systems shall receive a tax credit of:

(A)  Twenty-five percent (25%) of the cost of the system.

(iii)  The maximum cost of the system shall not exceed seven thousand dollars ($7,000). Provided, systems costing more than seven thousand dollars ($7,000) will receive a tax credit based on a seven thousand dollar ($7,000) system cost.

(b)  For purposes of the tax credit, the cost of the renewable energy system shall be the net cost of acquiring the system, and shall not include:

(1)  Unpaid labor including the applicant’s labor;

(2)  Operating and maintenance costs;

(3)  Land costs;

(4)  Legal and court costs;

(5)  Patent search fees;

(6)  Fees for variances;

(7)  Loan interest;

(8)  Service contracts;

(9)  Cost of moving a used renewable energy system from one site to another;

(10)  Cost of repair or resale of a system;

(11)  Any part of the purchase price that is optional, such as an extended warranty or an upgraded monitoring system; and

(12)  Delivery fees.