Home battery installers in Mercer Island, WA

What it really costs in Mercer Island

A typical tesla powerwall 3 (13.5 kwh), installed costs $14,500 installed. Most jobs land between $11,500 and $18,500 (one powerwall 3 (13.5 kwh, integrated hybrid inverter), backup gateway/backup switch, wiring, mounting, permit, interconnection paperwork, commissioning. expansion units extra (~$6,000 each). excludes main-panel or service upgrade (+$3,000-$5,000 where needed) and solar.). With the biggest rebate on offer here ($10,000), a typical job could cost you as little as $4,500.

Cost sources: EnergySage - Tesla Powerwall 3 review (typical installed ~ $13,473, ~ $998/kWh); EnergySage - 2026 cost of energy storage in New Jersey ($1,074/kWh; 13 kWh avg $13,963, range $11,869-$16,057); EnergySage - 2026 cost of energy storage in Connecticut ($1,167/kWh). Rebates come with conditions (equipment, income, approved contractor), so check each program.