Residential solar costs vary based on whether you choose a grid-connected or a fully independent off-grid setup. Typically, quality grid-connected systems (after STC rebates), without a battery, range from $7,500 for smaller houses to $20,000 for large family homes, but it depends on your energy needs. Full off-grid setups are more significant investments, ranging from $25,000 to $80,000+ depending on power requirements and site complexity.