Compare the total cost of ownership between a battery energy storage system (BESS) and a diesel generator. Find out which option is cheaper over time based on your daily energy needs.
It depends on utilization. A battery has a high upfront cost but near-zero marginal cost per kWh after charging. A diesel generator has a low upfront cost but high ongoing fuel and maintenance costs. For frequent daily use over more than 3–5 years, a battery system typically becomes cheaper. For rare backup use (under 100 hours/year), a diesel generator often wins on total cost.
Divide the total lifetime cost (upfront capital + replacements + fuel + maintenance + electricity for