Build actual load and recharge cases, compare whole PV and battery arrangements, check equipment limits and track chronological shortages and recovery.
Record each load’s energy, operating schedule and total simultaneous real/apparent power. Include communications, controls, standby and seasonal use. Define which loads are essential, how long they must run without replenishment and what fallback is available when the energy target cannot be met.
Obtain monthly climate data and a supported array-plane resource or yield model for the operating seasons. Choose explicit low-resource and recovery cases. Size whole modules for load plus additional stored-energy recovery, counting inverter, PV-path and charging losses once.
Calculate battery demand from AC/DC loads, autonomy, actual starting SOC, lower SOC limit and available capacity at the relevant temperature and age. Compare whole identical-unit arrangements within the documented series and parallel limits, then confirm the actual operating-voltage and current envelopes.
Select the actual MPPT or PWM controller model and compare its separate voltage, current, power and battery limits. Check the inverter’s AC events and battery envelope. Review module temperature correction, feasible strings and cable constraints using equipment documentation and the applicable electrical design.
Simulate an explicit sequence of PV and DC-bus load intervals from the chosen initial SOC. Inspect every interval’s unmet load, curtailment and final SOC under actual charge/discharge power limits. Refine coarse intervals around peaks and transitions, then use a longer validated time-series model for service reliability.
Have the system installed and commissioned through the applicable qualified process, including protection, charging profiles, low-voltage response and backup operation. Retain equipment revisions, design cases and measured load/PV/battery data. Revisit the cases after load changes, seasonal shortages or battery-condition changes.
Build a daily PV/DC-bus load case and a chronological interval profile. · Calculate whole-module daily energy requirements and expose a zero-yield deficit. · Track chronological battery dispatch, unmet energy and curtailed PV. · Save measured interval cases for comparison with the design sequence.
Keep continuous and timed peak watts/VA separate from daily watt-hours. · Compare AC W/VA, peak duration and required DC supply current.
Retain the location and monthly horizontal climate evidence.
Use the correct irradiation plane and integration period.
Calculate required nominal Wh/Ah and finite whole-unit arrangements. · Revise the energy case when load, capacity or allowed SOC changes.
Record the SOC window and charge-throughput basis independently.
Check actual MPPT or PWM input and charging constraints.
Find feasible whole strings on each independent MPPT input.
Compare the full-loop drop, adjusted ampacity and terminal/voltage ratings of actual candidates.
Reconcile measured or modeled AC energy intervals where that measurement boundary applies.
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Use the stated averaging period and resource quantity; a climate average does not preserve chronological weather.
PV voltage, short-circuit current, charging current and battery settings are separate constraints.
Use explicit array, conversion and operating assumptions when interpreting energy simulations.
A large battery may survive a deficit but still take longer than expected to recharge while serving the next day’s load.
Averaging a short large load across a whole day can hide the power limit that actually prevents operation.