Catch Latent Defects While You Can Still Enforce Your Warranty
A battery plant passes its site acceptance test (SAT) on plant level, and the hidden defects pass right along with it. We verify your warranted battery parameters, AC-side at the point of connection, and check your warranty contract for what you can actually enforce. We deliver a shareable, offline-ready report in 48 hours with no live uplink or continuous telemetry stream required.
Manufacturer Baseline
Conventional SAT by manufacturer with hidden blind spots.
vs.
Third-Party Diagnostics
Full cell-level transparency with volytica.
Choose Your Battery Add-On Scope for Standard SAT
Secure your investment before the Commercial Operation Date (COD) with independent basic or pro diagnostics during commissioning.
| Feature Scope | Compliance Check | Diagnostics (The X-Ray) |
|---|---|---|
|
Independent AC-Side Battery KPI Validation Validation of warranted parameters (capacity/SOH, round trip efficiency/RTE). |
✓ | ✓ |
| Warranty Contract Gap Analysis | ✓ | ✓ |
|
Offline-Ready Report in 48h Shareable report, no live uplink or telemetry required. |
✓ | ✓ |
|
100% Bottom-Up DC Diagnostic Assessment down to rack, string, and pack level. |
— | ✓ |
|
Latent Defect & Manufacturing Flaw Detection Surfaces hidden anomalies and outliers before they hit your topline. |
— | ✓ |
| BMS Safety Logic & SoC-Estimation Audit | — | ✓ |
|
Expert-Curated Action Plan For defect rectification. |
— | ✓ |
|
Special Offer: Continuous Battery Monitoring PRO Order before 2026-12-31 |
— | 6 MONTHS FREE |
|
Pricing Tiered pricing based on your total BESS asset capacity. |
Starting at €2,900 + €10/MWh |
Starting at €5,900 + €30/MWh |
Diagnostic Scanning Simulator – See the Difference
Real-World Diagnostic Case Study: Pre-Commissioning Battery Analysis (based on actual volytica field data from a 10 MWh European BESS project). Click the tabs to compare diagnostic depth.
OEM ONLY
Manufacturer Baseline for Site Acceptance Test
Standard SAT
Scope: Plant / Asset level
System Status: PASS
Data Basis: Aggregated AC Output (plant SCADA status reports)
Boundary: DC cell health, thermal distribution, and individualized rack imbalances are unverified.
Impact:
Signing off SAT on the manufacturer protocol alone shifts the burden of proof to the operator, and passes latent defects with it.
VOLYTICA PRODUCTS
Select your scope to close warranty gaps:
BASIC: Compliance
Pro: Diagnostics (Cell X-Ray)
Choose your Plan
VOLYTICA PRODUCTS
Select your scope to close warranty gaps:
BASIC: Compliance
Pro: Diagnostics (Cell X-Ray)
BASIC: Independent Compliance Check
Scope: Third-party AC-level parameter verification & warranty contract review.
System Status: WARRANTY DEVIATION DETECTED
Data Basis: Independent analysis & empirical validation of warranted parameters (e.g., capacity, SoH, RTE).
Boundary: Identifies warranty parameter non-compliance. Pinpointing exact cell/sensor root causes requires diagnostic deep analytics.
Impact:
Provides fast, independent proof of AC performance gaps against warranty contracts to halt handover. Check with your insurer for premium discounts based on independent validation.
VOLYTICA PRODUCTS
Select your scope to close warranty gaps:
BASIC: Compliance
Pro: Diagnostics (Cell X-Ray)
PRO: Diagnostics (The Cell Level X-Ray)
Plant Assessment Example:
Bank 1: PASS
Bank 2: PASS
Bank 3: FAIL (Rack 06: Temp Sensor Issue / +30K Spread)
Bank 4: FAIL (Rack 06: Cell Imbalance / U_diff_avg 182.9% of spec)
Scope: Bottom-up DC diagnostics (cell/rack level), BMS logic validation + 6-month free monitoring.
System Status: CRITICAL LATENT DEFECT LOCATED
Data Basis: Full DC-side telemetry analysis (cell voltages, thermal metrics) & BMS safety/SOC log audit.
Boundary: 6-month free monitoring requires data push to volytica’s standard APIs.
Impact:
Verifiable, cell-precise proof to enforce OEM warranty repairs and eliminate long-term capacity losses prior to final acceptance sign-off. Includes expert action plan and 6 months verification monitoring.
Download BESS SAT Scope & Pricing Overview
Get immediate access to the full scope breakdown and capacity-based pricing tiers as a PDF.
✦ Special Offer ✦
Get 6 months of free PRO Monitoring¹ with every SAT Diagnostics (PRO) order placed before Dec 31, 2026.
¹ Data must be pushed towards volytica’s standard APIs.
Please leave your details to receive the overview as pdf:
Built for IPPs and utilities, VPPs and aggregators, insurers, banks and lenders.
FAQ about Our BESS SAT Service
We step in during the final commissioning phase, right before the Commercial Operation Date (COD) and final sign-off. While your Engineering, Procurement, and Construction (EPC) partner handles the physical setup and grid integration, volytica performs an independent, data-driven diagnostic check of the AC and DC systems (depending on package) to verify all warranted performance parameters and audit your warranty contract for gaps in enforcement.
For all utility-scale systems starting at 10 MWh, independent site acceptance test diagnostics are essential.
A battery energy storage system (BESS) is a multi-million-euro capital expenditure (CapEx) investment with strict long-term warranty conditions. Unidentified cell degradation, state of charge (SoC) miscalibrations, and capacity shortfalls before the commercial operation date (COD) can directly jeopardize your long-term return on investment.
Comprehensive volytica SATs account for less than 0.01%–0.1% of total CapEx, making them one of the most cost-effective risk mitigation steps before final EPC sign-off.
A FAT (Factory Acceptance Test) usually takes place at the manufacturing facility before shipping.
An SAT (Site Acceptance Test) occurs on-site after the system has been installed and connected to auxiliary power or the grid during commissioning.
Requirements for our SAT diagnostics:
Neither on-site presence nor a live plant uplink is required. We simply process the standard log files that are generated during your SAT performance and load tests, uploaded via a secure shared folder. You will receive your shareable PDF report within 48 hours.
Note: Providing these standard test logs is typically part of your EPC’s standard commissioning scope and should be delivered without additional vendor charges.
Our transparent pricing consists of a fixed base fee plus a capacity-based rate (€/MWh). Larger assets automatically benefit from volume discount tiers (up to 1 GWh+). Download the Pricing & Scope Overview above for the complete rate schedule.
Basic Compliance Check:
Validates key AC-side performance metrics (e.g., capacity/state of health [SoH], real-time energy [RTE]) against your commercial agreements. Provides a legal/technical gap analysis of your warranty contract.
PRO Diagnostics (Cell X-Ray):
Includes everything in the BASIC check, plus a 100% bottom-up DC-level audit down to the rack, string, and pack levels. This feature detects hidden cell imbalances, temperature sensor anomalies, and BMS logic/SoC calculation errors. It also delivers an expert-curated action plan for rectifying OEM defects.
When you order the PRO Diagnostics SAT scope before December 31, 2026, you receive 6 months of continuous PRO Battery Monitoring at no additional cost.
To activate the free monitoring period, your system must push telemetry data to volytica’s standard APIs following successful commissioning.
Lenders and insurance underwriters increasingly require independent third-party verification before Financial Close or Commercial Operation Date (COD).
Presenting a comprehensive, cell-level diagnostic audit proves risk mitigation, helps prevent catastrophic thermal events, and can be used to negotiate lower insurance premiums.
Yes. In addition to identifying enforcement gaps in your current project, our expert review provides concrete, reusable text suggestions and best-practice clauses that you can integrate into future BESS procurement and O&M contracts.
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