Tesla has cut the price of their popular Solar battery, the Powerwall 2, by $650 to $11,700 including supporting hardware. This is the listed price on their website for direct sales to customers and does not include installation costs.
While this 5% reduction in costs won’t transform the business case for a household to install a solar battery, this is a good sign that batteries are once again decreasing in price as manufacturing production increases.
As recorded by Solar Choice’s battery pricing index the cost to install batteries with your Solar PV system have actually increased in cost over the last 2 years.
In some states there are rebates available to help with excessive costs of installing batteries.
This article gives a complete guide to the rebates available, state by state