Since it's tax time and most of our boats meets the requirement for a primary or secondary residence. After reading the fed's requirements for energy storage "
The federal tax code does not explicitly reference energy storage, so stand-alone energy storage systems do not qualify for the tax credit. However, the IRS issued Private Letter Rulings in 2013
, which address energy storage paired with PV systems. In both cases, the IRS ruled that the energy storage equipment when paired with PV met the statutory definition of a "qualified solar electric property expenditure," as was eligible for the tax credit. It is important to note that Private Letter Rulings only apply to the taxpayer who requested it, and do not establish precedent. Any taxpayer considering the purchase of an energy storage system should consult their accountant or other tax professional before claiming a tax credit. "
It seems that if you connect a Solar panel to your battery bank then the cost of batteries, and all associated equipment is all qualified for the tax credit. ( If purchased in the tax year) Without the solar panel not so much. Just another reason to go solar