Residential solar installations typically cost between $2. Factors like roof type, system size, and local labor prices drive these variations. A 6-kilowatt system, common for households, may cost between $15,000 and $24,000 before incentives or tax. NLR analyzes the total costs associated with installing photovoltaic (PV) systems for residential rooftop, commercial rooftop, and utility-scale ground-mount systems. This work has grown to include cost models for solar-plus-storage systems. Federal Tax Credit Urgency: With Congress proposing to end the 30% federal tax credit after 2025, homeowners. Switch to solar with a system built for you. Join over 8,000 people who received a free, no obligation quote in the last 30 days. The federal 30 % Section 25D tax credit ended on 2025-12-31 — 2026 buyers do not receive the.