24 per watt on a solar inverter, not including labor costs. Most solar panel contractors charge around $50 to $100 per hour. . Small Residential Systems (3-5 kW): These systems typically use inverters ranging from 3 to 5 kW, with prices ranging from $1,000 to $2,000. Additionally, the introduction of AI-driven smart inverters and IoT-based monitoring systems is contributing. . Unlock the full potential of your solar energy system with our high-quality solar inverters. The Sunny Tripower X, available in power classes from 20 to 30 kW, excels in rooftop and ground-mounted installations.