Preventive Maintenance
Planned technical inspections, functional checks, servicing and replacement of worn parts.
Reduced risk of failures and longer equipment life.
Qerra Care
EV Charging Infrastructure Maintenance and Operational Reliability
Qerra Care provides preventive maintenance, remote monitoring, diagnostics and repair for EV chargers and the associated electrical infrastructure.
Clear responsibilities, defined service levels and predictable maintenance throughout the system lifecycle.
Why Preventive EV Charger Maintenance Matters
EV charging infrastructure is a technical system with ongoing operating costs. Reliability, safety and continuous operation depend not only on a correct installation, but on consistent monitoring and maintenance once the system is in service.
Preventive maintenance does not eliminate every fault. It helps identify developing issues before they lead to unplanned outages or more disruptive failures — reducing unexpected breakdowns, unnecessary downtime, recurring incidents, operational uncertainty and avoidable reactive call-outs.
What Is Qerra Care?
Qerra Care is Qerra's lifecycle service for the technical maintenance and operational reliability of EV charging infrastructure after commissioning. It brings preventive maintenance, technical inspections, remote monitoring, diagnostics, incident response and repair into a single service framework with clearly defined responsibilities and service levels. It includes:
- Preventive and planned maintenance
- Rapid incident response and repair
- Periodic and annual technical inspections
The objective is not simply to repair equipment after a failure, but to reduce unplanned downtime and keep the charging infrastructure in a predictable technical and operational condition.
Everything is delivered under a clearly defined service agreement with specific responsibilities, timeframes and service levels. Qerra Care is not a one-off warranty and is not limited to reactive service — it is a complete operational framework with explicit responsibilities and processes.
What EV Charging Infrastructure Maintenance Includes
Incident Response and On-Site Technical Support
24/7 response to incidents with a guaranteed response time, remote diagnostics where possible and on-site intervention where required.
Faster restoration of normal operation and reduced downtime.
EV Charger Diagnostics and Repair
Fault diagnostics, troubleshooting, corrective maintenance and replacement of defective components.
Safe and reliable system operation over time.
Spare-parts coordination
Stock management and replacement of spare parts.
Repair and maintenance without unnecessary delay.
Periodic and Annual Technical Inspections
Verification of compliance with technical and regulatory requirements as part of lifecycle management.
Sustained safety, reliability and regulatory compliance.
Configuration updates
Latest versions, calibration and validation.
Optimal performance and security.
Remote Monitoring and Early Issue Detection
Telemetry-based monitoring to detect, diagnose and determine the appropriate intervention. Some incidents can be resolved remotely, without a site visit.
Earlier detection and faster technical assessment before an issue affects operation.
Maintaining the Charging Infrastructure as a System
The reliability of a charging point depends on more than the charger itself. Power supply, electrical protection, communications, configuration and software connectivity all form part of the wider charging system.
Qerra Care therefore approaches maintenance in the context of the complete charging infrastructure and the agreed scope of responsibility.
EV Chargers
Technical condition and functionality of AC and DC charging equipment.
Electrical Infrastructure
Electrical components and protection systems included within the agreed service scope.
Communications and Connectivity
Connectivity between charging equipment and the systems used to manage it.
Configuration and Software
Settings and integrations that affect normal charging operation.
Monitoring
Operational visibility and early identification of technical issues.
The exact technical scope depends on the infrastructure and the agreed level of service.
Costs and responsibilities
Maintenance is a paid service.
Qerra Care precisely defines:
- The scope of services included
- Response times (SLA)
- The division of responsibilities between the client and Qerra
Activities outside the agreed scope are billed separately.
Without an active Care programme, Qerra does not assume operational responsibility for continuous operation, monitoring or incident response.
SLA and Operational Reliability
For business-critical charging infrastructure, maintenance should be measurable. Qerra Care therefore defines service levels, response times and responsibilities for technical incidents. The same figures go into the service agreement.
Initial response
≤ 4 hours
within business hours; ≤ 8 hours outside them
On-site diagnostics
≤ 24 hours
for Sofia, Plovdiv, Varna; ≤ 48 hours for other sites
Temporary replacement infrastructure
up to 72 hours
for critical failures and per the agreed scope
Target site-level uptime
99.5%+
measured monthly, excluding planned maintenance
Monthly operational report
5th of the month
monthly report — uptime, incidents, energy, SLA performance
Uptime is the share of time the charging infrastructure is operational. The 99.5%+ figure is a target uptime, measured monthly and excluding planned maintenance. It represents the intended level of availability under the defined service conditions and is not an unconditional guarantee of continuous operation.
Specific SLA values are confirmed after the site audit and depend on access, connectivity and contract scope.
SLA parameters
A commitment, not a promise
Reaction time
24 h
Guaranteed response time for critical events.
Uptime target
99.5 %
Backed by the maintenance contract.
Monitoring
24 / 7
Continuous status observation per station.
Preventive checks
2× / year
Scheduled on-site inspections and calibration.
A proactive approach
Qerra Care is built on continuous monitoring, early detection of issues and preventive maintenance.
- Telemetry and analytical models detect signs of degradation, communication issues or unusual behaviour before they turn into a real operational incident.
- Maintenance shifts from reactive intervention to planned, controlled prevention — reducing unplanned downtime, improving reliability and extending equipment life.
01
Monitoring
24/7 telemetry
02
Analysis
deviations · trends
03
Intervention
planned · preventive
04
Review
report · adjustment
Integration with Qerra OS
Maintenance data is synchronised with Qerra OS, creating a single management platform.
Integrated analytics support energy management, capacity planning and operational optimisation.
Qerra's APIs provide direct connectivity and integration with your corporate systems for ticketing, asset management and financial reporting.
Operational framework and responsibilities
- Responsibility starts with the maintenance described in the service agreement and ends when the infrastructure is handed back to the client.
- Predictable costs and documented continuous operation are key to the long-term value of the asset.
Infrastructure without predictable maintenance stops being infrastructure.
What we don't do
Discipline in scope is a condition for the reliability Qerra promises.
- We do not take on Qerra Care for infrastructure we have not designed or have not approved through an audit.
- We do not offer Qerra Care without a prior technical audit of the site and infrastructure.
- Qerra Care is not a 'pay-per-incident' service — it is a long-term subscription with a fixed monthly commitment.
- We do not recommend hardware we cannot reliably support operationally in the region.
- We only work with a clear allocation of responsibilities between the client, the distribution system operator and Qerra.
How to get started
01
Initial consultation
The Qerra team reviews your infrastructure, operating conditions and site needs.
02
Analysis and recommendation
We prepare a needs analysis and a recommendation for the optimal package of services.
03
Service agreement
We clearly define the scope of the service and our responsibilities in the agreement — your guarantee for continuous operation.
04
Activation
When Qerra Care is active, you get 24/7 monitoring, preventive maintenance and a guaranteed response to incidents.
Maintenance for Existing Charging Infrastructure
Qerra can take responsibility for existing charging infrastructure installed by another contractor, subject to a prior technical assessment and approval. The assessment establishes the current technical condition of the infrastructure and determines the scope of responsibility that Qerra can reasonably undertake.
Frequently Asked Questions
EV charger maintenance can include preventive checks, remote monitoring, diagnostics, technical intervention, repair and periodic inspections depending on the agreed scope and SLA.
Maintenance frequency depends on the equipment, utilisation, operating environment and agreed service plan. Under Qerra Care, preventive maintenance is performed according to the selected service level and agreed schedule.
Preventive maintenance is planned to identify developing issues and reduce the risk of unplanned downtime. Corrective maintenance takes place after a fault or incident and focuses on diagnostics and restoring normal operation.
Yes, subject to a prior technical assessment and approval. This establishes the current condition of the infrastructure and the scope of responsibility Qerra can reasonably undertake.
Qerra Care can cover AC and DC charging infrastructure depending on the equipment, its technical condition and the agreed service scope.
An SLA defines agreed service levels such as response times, incident priorities and responsibilities. It makes maintenance performance measurable and predictable.
Where the equipment and connectivity allow it, some issues can be identified remotely. This supports faster incident assessment and helps determine whether an on-site intervention is required.
Need Reliable Maintenance for Your EV Charging Infrastructure?
We will assess your existing infrastructure, operational requirements and required service level and propose an appropriate Qerra Care scope.
With Qerra Care you get more than maintenance — you get predictable long-term, reliable operation and lower operating costs.
Infrastructure without predictable maintenance gradually becomes an operational risk.