PV array and BESS on the same interconnection, gated together
Commissioning software for solar-plus-storage where the PV array and the battery system share one interconnection point but have to be commissioned and proven on two different test regimes.
A hybrid plant pairs a PV array with a co-located BESS behind a single point of interconnection, with a hybrid inverter or shared PCS coordinating charge, discharge and export. Deskely holds the solar side and the storage side in one register with a shared interconnection gate, so the plant's dispatch and grid-support functions are proven together rather than each half assuming the other is ready.
- Assets
- PV array, BESS, hybrid inverter or shared PCS
- Test
- PV commissioning, BESS commissioning, dispatch test
- Interface
- Shared point of interconnection
- Gate
- Combined COD across both technologies
Choose your project type
The problem
Two commissioning regimes, one interconnection point, and neither vendor is responsible for proving they work together.
The PV EPC contractor commissions strings, combiner boxes and inverters against a solar test regime; the BESS integrator commissions racks, PCS units and fire suppression against a storage test regime; both hand off to a shared point of interconnection and a hybrid control system neither one owns end to end.
When each side's commissioning records live in separate systems, nobody can confirm that the plant's dispatch logic — charging from excess PV, discharging on a grid signal, ramp-rate control — actually works before the interconnection agreement is tested at the shared meter.
Deskely holds PV and BESS assets in the same register with a shared interconnection tag, so combined COD readiness reflects both technologies and the control logic that ties them together, not just whichever side finished first.
Setting up the register
PV blocks, BESS containers and the hybrid controller are tagged assets sharing one interconnection gate.
Single line diagrams covering both the PV array and the BESS are parsed into one register, so every string, inverter, battery rack and PCS unit carries its position relative to the shared point of interconnection.
Pre-energisation checklists for the PV side and the storage side are templated separately, respecting their different test regimes, while a combined dispatch and control logic test template sits above both, testing the functions that only exist because the two systems are paired.
The hybrid inverter or energy management system (EMS) controlling charge, discharge and export limits is tagged as its own asset with its own commissioning sequence, linking the PV and BESS registers rather than sitting outside either.
Execution
PV commissioning, BESS commissioning and dispatch testing are gated independently, then proven together.
String testing and inverter commissioning on the PV side run in parallel with battery rack acceptance and PCS commissioning on the storage side, each against its own test regime and its own vendor punch list.
Once both sides report mechanical completion, dispatch logic testing verifies the EMS charges the BESS from excess PV generation, discharges on schedule or grid signal, and respects ramp-rate and export limits set by the interconnection agreement.
Findings from dispatch testing are logged against the EMS or hybrid inverter tag rather than against either the PV or BESS side alone, so a control logic fault is not mistakenly chased as a PV or storage hardware defect.
Combined COD and handover
The asset owner inherits one plant, not two commissioning files that happen to share a substation.
PV commissioning reports, BESS safety and PCS records, and EMS dispatch test results all export from the same register, so the combined COD evidence pack demonstrates both technologies and their coordination in one submission to the utility.
Because dispatch logic is tracked as its own tested function rather than assumed from separate PV and BESS sign-off, the operations team inherits confirmed evidence that grid-support functions work as designed from day one.
Every signature carries a name, role and timestamp, which is what the interconnection agreement's commissioning requirements and the asset owner's lenders both expect before combined COD is declared.
The dossier
PV and storage prove out as one coordinated grid asset, not two generators sharing a meter.
A hybrid plant's interconnection study assumes the PV inverters and the BESS's PCS behave as one asset at the point of common coupling. The dossier holds ride-through, ancillary service qualification and settlement metering as distinct record sets so each counterparty's audit finds the evidence it needs.
Inverter commissioning report
PV inverter AC output and anti-islanding protection meet the equipment list
at first AC energisation of the PV side
PCS commissioning report
the BESS power conversion system charges, discharges and dispatches within its rated envelope
at first energisation of the storage side
Coordinated ride-through test record
PV inverters and PCS respond together to a simulated voltage or frequency disturbance as one asset
during the interconnection study's ride-through verification
Ancillary service qualification test record
frequency response, fast frequency response or black start performance meets the contracted pass criteria
at ancillary service qualification, repeatable on grid operator request
EMS dispatch and telemetry verification record
the energy management system correctly coordinates and reports combined plant output to SCADA
before the hybrid plant is released to coordinated operation
Settlement metering traceability record
energy and capacity revenue streams reconcile to the specific inverter, PCS or EMS record they came from
at commercial operation, ongoing through revenue metering audits
How it runs
From two vendor scopes to one proven hybrid plant.
Hybrid programmes reward a register that treats the interconnection and the dispatch logic as their own gated scope, not an assumption layered on top of two separate commissioning files.
- 01
Model both technologies
PV blocks, BESS containers and the hybrid inverter or EMS modelled as linked subsystems sharing one interconnection tag.
- 02
Parse combined single line diagrams
PV and BESS single line diagrams drafted into one register showing each asset's position relative to the shared point of interconnection.
- 03
Template both test regimes plus dispatch
PV and BESS test templates instantiated separately, with a combined dispatch and control logic test template layered above both.
- 04
Gate combined COD on proven coordination
Combined COD reported only once PV, BESS and dispatch logic all carry signed evidence, with punch tracked to closure across all three.
FAQ
Questions about Solar-plus-storage hybrid scopes.
Keep reading
Solar and energy storage commissioning
The full sector view: string testing, grid connection, statutory sign-off and the terminology behind them.
Read moreITR records
Pre-energisation checklists and functional performance test records defined once per equipment type and instantiated across every inverter, string and rack.
Read moreCertificates
Mechanical completion, ready-for-energisation and handover-to-operations certificates issued from signed records.
Read moreOther solar and energy storage project types: Utility-scale solar farm commissioning, Commercial rooftop solar commissioning, Battery energy storage system (BESS) commissioning, Floating solar (floatovoltaics) commissioning, Solar tracker system commissioning, Solar substation and grid connection commissioning, Green hydrogen electrolyser commissioning, Carbon capture and storage (CCS) commissioning, Biogas and biomass plant commissioning.
