Central Inverter Repair  ///  Electronic Board Repair  ///  PAC Test Reports · IEC 61724-1  ///  IGBT Module Refurbishment  ///  PVsyst Modeling  ///  Temperature Corrected PR  ///  Inverter Life Extension  ///  BESS Consulting  ///  Thermal Inspection  ///  24/7 Emergency Response  /// 
Always open — 24/7 emergency response
Central Inverter Specialists · Prague, CZ

YOUR PLANT
IS DOWN.
WE FIX IT.

Specialized repair and life extension for central inverters. Electronic board repair, IGBT module refurbishment, IEC 61724-1 PAC test reports, and PVsyst performance analysis — every hour offline costs money, we respond fast.

15+
Years Experience
24/7
Always Available
7+
Brands Covered
MWs
Capacity Restored
PAC test
What We Do

OUR
SERVICES

From emergency corrective maintenance to structured life extension programs and independent performance certification — we cover the full inverter lifecycle.

01 / Core Service

Central Inverter Service

Corrective and preventative maintenance for central inverters. On-site and remote support. Emergency 24/7 response to minimize production losses.

SatconSiemensREFUsolABBKaco
02 / Board Repair

Electronic Board Repair

Full-spectrum board repair for all inverter brands. Main controller boards, IGBT drivers, V&I measurement boards, HMI displays, AC/DC filter boards, insulation measurement boards.

IGBT DriversHMI DisplaysControl Boards
03 / Module Repair

Semikron SKiiP942 Repair

Testing, service and complete refurbishment of SKiiP IGBT modules. Temperature monitoring, current measurement errors, power supply faults — fully resolved.

SKiiP942GB1203DK01033DK0124
04 / Performance

PAC Test & Data Analysis

Independent Provisional Acceptance Certificate tests per IEC 61724-1. Temperature-corrected PR calculations, PVsyst simulations, P90/P75 studies and energy audit reports.

IEC 61724-1PAC ReportsTCPRP90/P75
05 / Program

Inverter Life Extension

Structured programs to extend operational lifespan of aging central inverters. Reduce capital expenditure on full replacements while maintaining grid reliability.

RefurbishmentTestingComponent Renewal
06 / Consulting

PV & BESS Consulting

Independent technical consulting for PV and battery energy storage projects. Expert assessments, technical due diligence, thermal inspections, and operational optimization.

PV SystemsBESSThermal Inspection
Kaco Inverter — Field Service
Signal Analysis
Isolation Testing
IGBT Module Measurement
Commissioning & Diagnostics
Performance Certification

PAC TESTING &
DATA ANALYSIS

We provide independent Provisional Acceptance Certificate (PAC) testing for solar power plants across Central and Eastern Europe. Our reports give plant owners, investors, and lenders a rigorous, defensible assessment of actual plant performance against contractual guarantees.

All PAC tests are conducted in strict accordance with
IEC 61724-1:2017 — Photovoltaic system performance monitoring — Guidelines for measurement, data exchange and analysis.

Temperature Corrected Performance Ratio

Standard PR calculations can mask the true performance of a plant by ignoring the effect of ambient temperature on panel output. We calculate the Temperature Corrected Performance Ratio (TCPR) — a more accurate and fair metric that removes thermal effects and isolates genuine system losses. This is especially critical for performance guarantee evaluations where contractual thresholds must be met.

Our Methodology

01
On-site sensor installation & data validation
Calibrated irradiance sensors (GTI), module temperature sensors and reference cells are installed and verified against plant SCADA data.
02
Data acquisition over qualifying days
Minimum qualifying days per IEC 61724-1 are accumulated, filtering out periods with grid outages, cloud transients below irradiance thresholds, or sensor anomalies.
03
PVsyst simulation & sensor cross-validation
Measured irradiance and temperature data is cross-validated against PVsyst simulations and historical satellite datasets to detect sensor drift or bias.
04
TCPR calculation & inverter-level analysis
Temperature-corrected PR is calculated at plant and inverter level. Individual inverter PR values are computed to identify underperforming units.
05
Certified PAC report delivery
A full PAC report is delivered with methodology, raw data, calculations, charts, conclusions and a pass/fail determination against the contracted performance guarantee.
PVsystPowered by PVsyst — Industry standard PV simulation software
PAC test equipment
PVsyst irradiance time series
PVsyst GTI correlation
PVsyst panel temperature scatter
Field measurement
On-site irradiance & temperature measurement
Every Major Brand

BRANDS WE
SERVICE

SATCON
Central Inverter
SIEMENS
Central Inverter
ABB
Central Inverter
REFUSOL
Central Inverter
KACO
Central Inverter
SEMIKRON
IGBT Modules
SOLARMAX
Central Inverter
Why PVaudit

TRAINED.
LICENSED.
INSURED.

01

Trained Engineers

Fully trained on central inverters from Satcon, Siemens, SolarMax, ABB, Kaco and more. Direct hardware-level expertise — not generalist knowledge.

02

24/7 Emergency

Every hour of downtime is lost revenue. We respond fast — on-site or remotely — to minimize production losses and get your plant back online.

03

15+ Years Deep

Over 15 years specializing in central inverter repair and PV performance. We've diagnosed every failure mode from IGBT faults to isolation board failures.

04

On-Site & Remote

Whether you need an engineer at the plant or remote diagnostic support, we offer flexible deployment across Central and Eastern Europe.

Get In Touch

LET'S TALK
ABOUT YOUR
INVERTER.

Always open — 24/7 emergency response
Phone / WhatsApp
Email
info@pvaudit.cz
Address
V Dolině 1157/6, Michle
Prague 10, 101 00
Czech Republic
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Messenger
WhatsApp · Signal · FaceTime