Does this choose an inverter?

No. It records DC/AC ratio from entered values only. Product selection, input compatibility and manufacturer instructions remain separate.

What ratio range should I use?

Enter the project or product basis being reviewed. The calculator does not generate a universal target range.

Why is export limit separate from ratio status?

Export limits can come from DNSP or project conditions and may require separate export-control review. They do not change the DC/AC ratio arithmetic.

Can this approve a DNSP application?

No. DNSP connection and export outcomes remain external checks.

What should be exported?

Export the array capacity, inverter capacity, entered ratio range, ratio result, export-limit note and reviewer details.

Solar inverter sizing record calculator

DCAC = Pdc / Pac; Ratio = DCAC; MinMargin = Ratio - Rmin; MaxMargin = Rmax - Ratio; ExportMargin = Elimit - Pac

PV array capacity and inverter capacity are entered by the user.
The target ratio range is a project comparison value.
Export limit is optional and does not decide network approval.
The worksheet does not select or approve an inverter.

Formula variables
Variable	Meaning	Unit	Use
Pdc	PV array DC capacity	kW	Entered PV array capacity.
Pac	Inverter AC capacity	kW	Entered inverter AC capacity.
DCAC	DC/AC ratio	ratio	PV array DC capacity divided by inverter AC capacity.
Ratio	DC/AC ratio	ratio	Same ratio reported as the primary result.
Rmin	Minimum entered ratio	ratio	User-entered lower ratio comparison value.
Rmax	Maximum entered ratio	ratio	User-entered upper ratio comparison value.
MinMargin	Minimum ratio margin	ratio	Calculated ratio minus entered minimum.
MaxMargin	Maximum ratio margin	ratio	Entered maximum minus calculated ratio.
Elimit	Entered export limit	kW	Optional user-entered DNSP or project export value.
ExportMargin	Export-limit margin	kW	Entered export limit minus inverter AC capacity.

Solar inverter sizing record calculator technical guide

Compare entered PV array DC capacity with inverter AC capacity, DC/AC ratio targets and export-limit notes for Australian solar project records.

Use this page when a solar project record needs a clear DC/AC ratio worksheet before the result is carried into an inverter schedule, quote note, design review or export-limit discussion.

Inverter Sizing Boundary

This calculator compares entered PV array capacity with entered inverter AC capacity. It does not select an inverter, confirm product compatibility, assign strings to MPPT inputs, assess clipping, approve export controls or decide DNSP connection outcomes.

Where this record sits
Related task	Use this page?	Why
DC/AC ratio record	Yes	This page owns the entered capacity ratio and margins.
PV string voltage	No	String voltage depends on module data, temperature and equipment voltage limits.
Export limit comparison	No	Use the export limit worksheet for net export margin and current.
Inverter AC cable run	No	Use the inverter AC cable voltage-drop worksheet once current and route data are known.
Product approval	No	Product compatibility and manufacturer requirements remain external.

Data Checklist

Inverter sizing source values
Value	Where it normally comes from	Stop if
PV array DC capacity	Array schedule, module count or project record	The capacity basis is not clear.
Inverter AC capacity	Inverter datasheet or schedule	The entered value is from a different model.
Ratio range	Project or product review basis	The range is copied without source.
Export limit	DNSP condition, project note or export-control record	It is being treated as approval.

Review Workflow

Identify the inverter sizing record reference.
Enter PV array DC capacity and inverter AC capacity on the same kW basis.
Enter the ratio range being used for this worksheet.
Enter export limit only as a comparison note when a source value exists.
Read DC/AC ratio and both ratio margins.
If the ratio is outside the entered range, review array capacity, inverter capacity and source basis.
Review export-limit warnings separately from the ratio status.

Worked Records

Inverter sizing examples
Situation	Inputs	Result	Record use
Residential record	13.2 kW array, 10 kW inverter, 1.0-1.4 ratio range	DC/AC ratio 1.32	Inside the entered range, with export-limit note visible.
High-ratio review	17 kW array, 10 kW inverter, 1.0-1.4 range	Ratio 1.70	Outside the entered range; stop for product and design review.
Commercial schedule	30 kW array, 25 kW inverter, 1.0-1.35 range	Ratio 1.20	Useful as an inverter schedule record.

Stop Points

PV array capacity is not tied to a module count or array schedule.
Inverter capacity is copied from a different product variant.
Ratio range has no project or product source.
Export limit is being used as a connection approval decision.
The ratio result is being treated as final product compatibility.

Array DC capacity: 13.2 kW
Inverter AC capacity: 10 kW
Entered ratio range: 1 to 1.4

DC/AC ratio1.32
Minimum margin0.32
Maximum margin0.08

DC/AC ratio1.32

Export-limit margin is -5 kW.

The ratio is inside the entered range, while the export-limit note still needs separate review.

Array and inverter capacities are entered from source records.
The ratio range is user-entered.
No product or DNSP approval is made.

Array DC capacity: 17 kW
Inverter AC capacity: 10 kW
Entered ratio range: 1 to 1.4

DC/AC ratio1.7
Minimum margin0.7
Maximum margin-0.3

DC/AC ratio1.7

Export-limit margin is 0 kW.

The ratio sits above the entered maximum and should be reviewed against product and project data.

The export limit is entered separately from the ratio range.
The worksheet does not choose inverter model or string allocation.
Manufacturer documentation remains controlling.

Array DC capacity: 30 kW
Inverter AC capacity: 25 kW
Entered ratio range: 1 to 1.35

DC/AC ratio1.2
Minimum margin0.2
Maximum margin0.15

DC/AC ratio1.2

No export-limit comparison was entered.

The ratio is within the entered range and can be exported with the capacity source records.

Entered export limit can be 0 when not used for comparison.
The ratio record is only arithmetic.
AS/NZS and DNSP requirements remain outside the calculator.