DNSP export planning calculator
Compare entered inverter export, minimum site load and DNSP export limit values for Australian solar export planning records.
Pnet = max(Pinv - Pload, 0); Headroom = Pdnsp - Pnet; Utilisation = Pnet / Pdnsp x 100; Iexport = Pnet x 1000 / (Fphase x V)- DNSP export limit is entered by the user.
- Minimum site load is an entered planning value unless measured separately.
- Three-phase current uses square root of 3 as the phase factor.
- The worksheet does not approve network connection or inverter settings.
| Variable | Meaning | Unit | Use |
|---|---|---|---|
| Pinv | Inverter export | kW | Entered inverter export capacity or planning value. |
| Pload | Minimum site load | kW | Entered site load assumed to offset export. |
| Pnet | Planned net export | kW | Inverter export minus minimum site load, not below zero. |
| Pdnsp | Entered DNSP export limit | kW | User-entered DNSP or project export limit value. |
| Headroom | Export headroom | kW | Entered DNSP limit minus planned net export. |
| Utilisation | Limit utilisation | % | Planned net export divided by the entered DNSP limit. |
| Fphase | Phase factor | factor | Use 1 for single phase and square root of 3 for three phase. |
| V | Voltage | V | Entered 230 V or 400 V project basis. |
| Iexport | Export current | A | Planned net export converted to current using selected phase basis. |
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DNSP export planning calculator technical guide
Compare entered inverter export, minimum site load and DNSP export limit values for Australian solar export planning records.
Use this page when a solar project needs a DNSP export planning record before discussing export control, inverter scheduling, AC cable review or network documentation. The page compares entered values; it does not decide whether export is allowed.
DNSP Export Planning Boundary
This calculator does not approve network connection, DNSP export limits, inverter settings, protection settings, commissioning outcomes or product configurations. It records arithmetic from values entered by the user.
| Task | Use this page? | Why |
|---|---|---|
| Export headroom | Yes | This page owns entered DNSP limit minus planned net export. |
| Limit utilisation | Yes | It shows planned net export as a percent of the entered limit. |
| Inverter sizing ratio | No | Use the inverter sizing record for DC/AC ratio. |
| AC cable voltage rise | No | Use inverter AC cable voltage drop once current and route data are known. |
| DNSP approval | No | Network rules and approval outcomes are external. |
Data Checklist
| Value | Where it normally comes from | Stop if |
|---|---|---|
| DNSP export limit | DNSP condition, application note or project record | The value is not current or site-specific. |
| Inverter export | Inverter schedule, product record or export-control basis | The capacity basis is unclear. |
| Minimum site load | Planning record, measurement basis or control strategy | It is being treated as guaranteed without source. |
| Phase and voltage | Supply context or project schedule | The current conversion basis is wrong. |
Review Workflow
- Identify the DNSP planning reference from the application, inverter schedule or design note.
- Select single-phase or three-phase context and confirm the voltage basis.
- Enter the DNSP export limit only as a user-supplied comparison value.
- Enter inverter export and minimum site load values from the source record.
- Read planned net export, headroom, utilisation and export current together.
- If headroom is negative, review export-control assumptions, DNSP requirements and inverter data outside this calculator.
- Keep the exported worksheet with the DNSP source, site load source and reviewer details.
Worked Records
| Situation | Inputs | Result | Record use |
|---|---|---|---|
| Three-phase headroom review | 10 kW limit, 13 kW inverter export, 2 kW minimum site load, 400 V | 11 kW planned net export, -1 kW headroom, about 15.88 A | Stop for export-control and DNSP review. |
| Single-phase inside limit | 5 kW limit, 6 kW inverter export, 2 kW minimum site load, 230 V | 4 kW planned net export, +1 kW headroom | Useful planning record before source review. |
| High site load case | 15 kW limit, 12 kW inverter export, 14 kW minimum site load | Zero planned net export | Check the site-load assumption before relying on it. |
Australian Context
Solar export planning in Australia can be controlled by DNSP connection conditions, AS/NZS 4777 inverter context, product settings, commissioning requirements and local authority expectations. This page keeps the arithmetic visible while leaving those external decisions outside the calculator.
Stop Points
- DNSP export limit source is missing or out of date.
- Minimum site load is not a reliable project value.
- Export headroom is negative.
- Three-phase current is calculated with a single-phase voltage basis or vice versa.
- The result is being used as network approval or inverter-setting approval.
Three-phase export headroom review
A commercial PV export record compares 13 kW inverter export with a 10 kW entered DNSP limit and 2 kW minimum site load.
- Reference
- DNSP-PLAN-1
- Phase
- Three phase
- DNSP export limit
- 10 kW
- Inverter export
- 13 kW
- Minimum site load
- 2 kW
- Planned net export11 kW
- Export headroom-1 kW
- Limit utilisation110%
15.88 A export current on the entered phase and voltage basis.
The planned net export is above the entered DNSP limit, so export controls and source values need review.
- DNSP limit is entered by the user.
- Minimum site load is a planning value.
- Network approval remains outside the worksheet.
Single-phase inside entered limit
A small inverter record keeps planned net export below the entered limit after minimum site load is considered.
- Reference
- DNSP-PLAN-OK
- Phase
- Single phase
- DNSP export limit
- 5 kW
- Inverter export
- 6 kW
- Minimum site load
- 2 kW
- Planned net export4 kW
- Export headroom1 kW
- Limit utilisation80%
17.39 A export current on the entered phase and voltage basis.
The entered values sit within the limit, while the source records still need project and DNSP review.
- Single-phase voltage basis is entered as 230 V.
- The site load offset is not guaranteed operation.
- The result is not approval.
High site load planning case
A planning case uses a high minimum site load to show when net export is clamped to zero.
- Reference
- DNSP-PLAN-LOAD
- Phase
- Three phase
- DNSP export limit
- 15 kW
- Inverter export
- 12 kW
- Minimum site load
- 14 kW
- Planned net export0 kW
- Export headroom15 kW
- Limit utilisation0%
0 A export current on the entered phase and voltage basis.
The arithmetic records zero planned net export, but the load assumption should be checked before relying on it.
- The high site load is deliberately entered.
- Measured operation may differ from planning values.
- DNSP and product settings remain external.