20kW solar battery prices typically range from around $18,000 to $29,000. This depends on a few factors, including: While the base unit itself can cost $16,000 to $27,000, that doesn't include installation and wiring ($1,500 to $3,000) or backup integration ($800 to. The 20kW solar battery price in Victoria / Melbourne stays aligned with national averages: Most homeowners choose Tesla or Sonnen. South Australia = the battery capital of Australia. JPC Solar offers the exceptional Alpha M5 20kWh battery which delivers outstanding value for customers with substantial energy requirements who need reliable. The average residential electricity price was approx. If you're considering saving yourself from outages or making money selling your excess electricity collected from your roof, a 20 kW capacity provides impressive long-term savings benefits.