The cost for such systems can range from €7,000 to €25,000. The wide price range accounts for variations in system size, panel type, and installation complexities. How much does a 100kW solar power plant cost? 100kW solar power plant prices US$75,252- Gel battery design. Note: If you need a quote for lithium battery design,please contact solar@pvmars. Over the 25-year lifetime of the solar panels, this equates to a total savings of $775,625. Battery storage: Lithium-ion vs. lead-acid significantly impacts cost and. This high-power, low cost solar energy system generates 100,300 watts (100 kW) of grid-tied electricity with (170) 590 watt Axitec XXL bi-facial model PS590M8GF-24/TNH, SMA Sunny High-power three-phase inverter (s), DC string combiners, 24/7 monitoring,.