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Off-Grid PV Energy and Battery Dispatch

Size whole PV modules for a daily load and recharge target, then track chronological battery SOC, unmet load and curtailed energy within operating limits.

Use this result well

Inputs that matter
Daily AC load energy (Wh), Daily direct-DC load energy (Wh), AC conversion efficiency (%), Additional daily inverter standby energy (Wh), and 16 more
Output to expect
Off-grid daily PV and recharge balance, Chronological battery dispatch
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Off-grid daily PV and recharge balance

Size a whole-module array for an entered day using the AC/DC load profile, a supported PV-to-bus yield factor and any additional battery recharge energy. Keep daily energy sizing separate from instantaneous power and weather resilience.

Required PV-bus Wh = AC Wh / inverter efficiency + DC Wh + additional standby Wh + stored recharge Wh / charging efficiency; module bus Wh/day = module W × peak-sun-hours × net PV-to-bus yield factor.

Chronological battery dispatch

Track a stated sequence of constant-power intervals through one DC battery bus. Report served and unmet load, curtailed PV and SOC while enforcing energy and charging/discharging power limits.

PV serves the DC-bus load first. Surplus charges at the entered efficiency and power limit; deficits discharge within the SOC floor, efficiency and power limit. Each interval updates stored energy before the next interval.

Updated: September 2026

Example Scenarios

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 3 whole PV modules

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 0 Wh unmet DC-bus load

FAQ

Size a whole-module array for an entered day using the AC/DC load profile, a supported PV-to-bus yield factor and any additional battery recharge energy. Keep daily energy sizing separate from instantaneous power and weather resilience. Track a stated sequence of constant-power intervals through one DC battery bus. Report served and unmet load, curtailed PV and SOC while enforcing energy and charging/discharging power limits.

Use the exact equipment data, measurement point, operating conditions and units described in the selected mode. Record source documents, dates and unresolved conditions in Sources and assumptions. Built-in examples illustrate arithmetic; they are not manufacturer ratings or approved designs.

Use Save planning case for an explicit local history entry. Copy MD keeps current inputs and notes; Download CSV exports the result breakdown. Export portable copies before clearing storage and save a separate case after changing equipment, conditions or measurements.

About Off-Grid PV Energy and Battery Dispatch

Size a whole-module array for an entered day using the AC/DC load profile, a supported PV-to-bus yield factor and any additional battery recharge energy. Keep daily energy sizing separate from instantaneous power and weather resilience. Track a stated sequence of constant-power intervals through one DC battery bus. Report served and unmet load, curtailed PV and SOC while enforcing energy and charging/discharging power limits.