Usable capacity is an operating decision, not just a label
Battery specifications often list nominal energy, usable energy and a permitted depth of discharge. Those numbers are related but they are not interchangeable. A system may technically support a deep discharge while the installer or owner deliberately keeps a reserve for backup, warranty protection or outage resilience. When comparing batteries, record the usable energy available under the proposed operating profile rather than dividing nominal kilowatt-hours by daily consumption. The battery runtime calculator can then use a more realistic available-energy figure.
Cycle life depends on more than the headline cycle count
A published cycle-life figure normally assumes a defined temperature, charge or discharge rate, state-of-charge window and end-of-life threshold. Two products can both advertise thousands of cycles while being tested under materially different conditions. Daily cycling at moderate power in a climate-controlled space is not the same duty as repeated high-power cycling in a hot garage. Melnti therefore treats cycle figures as manufacturer test evidence, not a promise that every installation will age identically.
Reserve settings change both backup readiness and daily throughput
A higher minimum state of charge leaves more energy available for an unexpected grid outage but reduces the battery energy available for normal self-consumption or time-of-use shifting. A lower reserve can improve daily utilization but may leave less emergency runtime. The right setting depends on outage frequency, critical loads, tariff structure and whether the system can automatically change reserve targets before severe weather. Review the related reserve-for-outages vs self-consumption comparison before treating one percentage as universally optimal.
Model the operating window explicitly
For a serious quote, record nominal capacity, manufacturer-stated usable capacity, configured minimum state of charge, maximum state of charge if limited, expected daily throughput, peak charge/discharge power and installation temperature range. Then test both a normal day and a backup day. This makes battery sizing auditable and prevents a sales proposal from using the largest nameplate number for one calculation and a smaller realistic number only after installation.