Understanding your bottleneck result
Why the lower number always wins
A system's actual maximum output is set by whichever component, battery or inverter, hits its limit first. A 10 kWh battery rated for 1C can theoretically supply 10,000 watts, but paired with a 6,000-watt inverter, the system will never exceed 6,000 watts no matter how capable the battery is on paper, the same hard ceiling that shows up in NREL's power electronics and smart inverter research, where a device's rated output is treated as a fixed operating limit rather than a target to occasionally exceed.
Why oversizing one side isn't automatically wasteful
A battery with more C-rate headroom than the inverter needs isn't a design flaw, since many systems are built with room to add a second inverter or expand later, a scenario the inverter sizing for future battery addition guide walks through directly. The bank voltage selection tool covers a related planning decision worth making at the same time as this comparison.
Why surge ratings deserve a separate check
Continuous and surge bottlenecks aren't always the same component. Once the chemistry is settled, size the bank. The backup runtime estimator in our Battery & Storage section can help you work out the capacity your daily load needs. The voltage sag under load calculator shows what happens to delivered voltage as a system approaches either limit.
What to check next
If the battery turns out to be your bottleneck, the parallel configuration calculator shows how adding a second battery module raises your available C-rate headroom. The same continuous-versus-surge distinction shows up at utility scale, where the DOE's Office of Electricity factors a storage system's power delivery limits into its grid-scale planning guidance.