Define outage loads and SOC reserve, compare whole battery arrangements and inverter events, then retain approved transfer tests and measured backup cases.
Choose the loads to be backed up, their daily energy, simultaneous W/VA and startup events. Record the required outage duration, expected initial SOC and whether the PV system can operate while isolated from the grid. Identify any essential service that needs a separate contingency.
Convert AC loads and direct DC consumption to battery demand with supported conversion and standby losses. Use the approved SOC window and available-capacity factor for the actual conditions. Compare finite whole-unit arrangements and retain the exact unit model and allowed interconnections.
Compare the actual inverter’s continuous W/VA and timed peak limits against simultaneous load events. Check minimum loaded and maximum charged battery voltage, continuous/peak DC current and supported battery controls. Where a separate PV controller is used, check its actual input and charging constraints.
Run a chronological PV/load sequence through the usable battery with actual charging and discharging limits. Include low-sun and high-load cases and review the remaining SOC. Separately value any expected tariff benefit while preserving the intended outage reserve and permitted operating modes.
Have the installation commissioned under its manufacturer, electrical and utility requirements. Verify supported isolation/transfer operation, backed-up circuits, load shedding, charging settings and recovery from a controlled outage test. Retain observed behavior and limits without intentionally exceeding battery or inverter ratings.
Save the equipment revisions, usable-capacity basis, reserve settings, commissioning evidence and outage cases. Record alerts and manufacturer-required inspections or service. Review the plan when essential loads, battery condition, seasonal resource or supported firmware behavior changes.
Record continuous and timed AC demand independently of energy. · Check the numerical AC and battery envelope while retaining unresolved compatibility. · Recheck measured load events and actual configured limits.
Retain the outage duration, load priorities and confirmed islanding/transfer capabilities.
Calculate nominal energy/Ah and minimum whole parallel strings. · Save revised load and capacity cases with dates and conditions.
Distinguish the outage discharge window from ending depth of discharge. · Track actual discharge throughput on a fixed reference basis.
Compare the actual MPPT or PWM charging path when that architecture applies.
Track outage unmet load, curtailed energy and final SOC. · Replace planning intervals with a measured controlled outage case.
Value stated self-use/export energy under the actual tariff.
Compare storage-related cash costs and benefits without pricing reliability as invented bill savings.
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Confirm what the proposed equipment and interconnection arrangement actually provide.
Battery voltage, charge settings and controller limits must match the actual equipment.
Keep energy, conversion and operating constraints in the model boundary.
A tariff schedule that leaves a low starting SOC changes the outage case even when battery nameplate capacity stays the same.
Networking, controls and continuous standby can matter over a long outage despite modest instantaneous power.