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Old or Faulty Solar PV System? The solution.

  • Writer: Regis Brun
    Regis Brun
  • Dec 23, 2025
  • 3 min read

Reprise d'une installation Enphase pour un ajout de batteries Sigenergy.
Reprise d'une installation Enphase pour un ajout de batteries Sigenergy.

Old or Faulty Solar PV System? REGIS ELECTRIC Repairs and Upgrades Existing Installations


Many solar photovoltaic (PV) systems installed 10, 15 or even 20 years ago are now partially or completely out of service.Faulty inverters, dead batteries, obsolete equipment or poorly designed systems are unfortunately very common today.

At REGIS ELECTRIC, we specialize in the diagnosis, repair, refurbishment and modernization of existing solar PV installations, including old, non-functional or abandoned systems.


Common Problems with Old or Non-Working Solar Installations


We regularly work on solar installations suffering from:

  • faulty or non-repairable inverters

  • little or no solar production

  • damaged or unsafe batteries

  • multiple independent systems installed over time

  • obsolete or non-compliant electrical equipment

  • lack of monitoring or maintenance

  • installations left unsupported after the original installer disappeared


These issues affect both residential properties and more complex installations.


Replacing a Faulty Solar Inverter: How Much Does It Cost ?


This is one of the most frequently asked questions.


As a general indication:

  • replacing a 3 kW single-phase solar inverter usually costs around €1,000 incl. VAT, supply and installation included

  • the final price depends on the brand, accessibility, existing wiring and the overall condition of the installation


Important note: A faulty inverter can sometimes hide other underlying issues (panel defects, insulation faults, outdated protections).That is why a professional diagnosis is always recommended before replacing equipment.


Solar PV Diagnostic: A Necessary First Step


REGIS ELECTRIC offers an on-site professional solar diagnostic to accurately assess the condition of your installation.

Diagnostic Pricing

  • €80 excl. VAT: travel cost

  • €80 excl. VAT: technical labour for the diagnostic


This diagnostic allows us to:

  • assess the condition of the solar panels

  • test the inverter and electrical protections

  • check cabling and system safety

  • identify which components can be reused

  • determine whether a simple repair or a full refurbishment is required


A proper diagnostic prevents unnecessary replacements and inaccurate quotations.


Does an Old Solar Installation Need to Be Fully Replaced? Not Necessarily.


Contrary to what is often said, an old solar PV system does not always need a complete replacement.

Our approach is based on:

  • a detailed analysis of the existing installation

  • reusing solar panels whenever possible

  • replacing only faulty or obsolete components

  • restructuring the system to make it reliable, clear and scalable


Our goal is simple: restore solar production at the right cost, without unnecessary work.


Centralising and Modernising Old Solar Installations


Many older solar systems are overly complex due to multiple modifications over time.

REGIS ELECTRIC offers centralised modern solutions, including:

  • a next-generation inverter

  • intelligent energy management

  • a back-up system in case of grid failure

  • battery storage adapted to your needs

  • real-time monitoring via smartphone


This approach improves:

  • reliability and safety

  • ease of maintenance

  • energy security

  • future upgrade possibilities


A Scalable Solar System, Without Constraints


All our refurbished installations are designed to be fully scalable:

  • additional batteries can be added later

  • solar panels can be replaced progressively

  • system power can be increased

  • integration with EV chargers or other equipment


You invest in a solid, future-proof foundation, without being forced into unnecessary expenses.


Local Solar PV Repair Services in the Alpes-Maritimes (06)


REGIS ELECTRIC provides solar PV diagnostics, repairs and refurbishments throughout the Alpes-Maritimes (06), including:

  • Valbonne

  • Mougins

  • Mouans-Sartoux

  • Grasse

  • Vence

  • Saint-Jeannet

  • Antibes

  • Cannes

  • Vallauris

  • Le Tignet and surrounding areas


Our local presence allows fast intervention on faulty or ageing solar installations.


Why Choose REGIS ELECTRIC ?


  • Over 20 years of experience in electrical and solar installations

  • Specialist in repairing and upgrading old solar systems

  • Honest and transparent diagnostics

  • Reliable, compliant and long-lasting solutions

  • One clear objective: 100% customer satisfaction


We regularly intervene after poorly designed or abandoned installations.Our role is to restore confidence in solar energy through solid and tailored solutions.


Is Your Solar Installation No Longer Working ?


Before considering a full replacement, request a professional solar diagnostic.

REGIS ELECTRIC will help you:

  • understand the real condition of your installation

  • assess repair or refurbishment costs

  • safely restore solar production


Contact us via our dedicated page:https://www.regiselectric.fr/contact



 
 
 

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