Resources and tools / EVSE operations
What Does Charger Downtime Cost Your Network?
Enter your number of charging points, fault frequency and time to restore service. Compare two scenarios to see how downtime and service effort change; the calculator uses your assumptions.
Test scenario: ten charging points
If ten charging points are each unavailable for two hours, their downtime adds up to 20 hours. If only one charging point is down for two hours, the total is two hours. This sum across charging points does not by itself establish lost revenue or utilisation.
Interactive calculator
Build the annual downtime and service-cost scenario.
Replace the illustrative inputs with your operating values before using the results. Calculations run locally in your browser.
Transparent method
Every result can be traced back to four equations.
Technical downtime and field-service effort are calculated separately.
Annual incidents
Number of charging points × fault incidents per charging point per year
Downtime hours across all charging points
Annual incidents × average downtime per incident
Failure-derived availability
1 − downtime hours across all charging points ÷ entered operating hours across all charging points
Annual operating cost
Downtime impact + first visits + repeat visits + other incident cost
Use one system boundary.
Count either individual charging points or whole charging stations. Use the same basis for the number, incidents, downtime and cost throughout the calculation.
Use your internal value.
Revenue, contractual exposure, customer impact and operational disruption are different quantities. Enter the value used by the actual decision owner.
Expose diagnosis quality.
A repeat visit adds travel, labour, access and delay. The model keeps its rate and cost visible instead of burying them in a flat service estimate.
Do not confuse a target with evidence.
The target process becomes credible only after field measurements confirm the downtime, visit and cost assumptions used here.
From exposure to execution
Uptime improves through a controlled service process, not through a percentage alone.
Use the cost model to prioritise the workflow. Then test the charging station with defined steps, measured values and a reproducible result before it returns to service.
Commission correctly
Verify charging functionality and electrical safety after installation before the station enters normal operation.
Diagnose independently
Reproduce the charging process without relying on a customer vehicle and isolate whether the station behaves as expected.
Verify the repair
Repeat the relevant charging, fault and safety checks before the service case is closed.
Inspect periodically
Use a guided workflow and retained reports so recurring checks remain comparable across technicians and sites.
System boundary
Know what the result includes. Know what remains outside.
A useful uptime model is explicit about exclusions. Add external outage causes only when the same counting basis, time period and cost logic are preserved.
- Entered failure frequency
- Average downtime per incident
- Cost impact per downtime hour per charging point
- First onsite visit cost per incident
- Repeat-visit frequency and cost
- Other entered incident cost
- User-defined service improvement scenario
- Planned maintenance windows
- Overlapping incidents and partial derating
- Grid or site power outages
- Backend, payment or telecom availability
- Vehicle-specific interoperability effects
- Spare-parts lead time outside entered downtime
- Contractual or regulatory exclusions
- EV simulation for supported charging interfaces
- Functional charging checks
- Selected fault simulations
- Electrical safety checks in released configuration
- Commissioning and maintenance workflows
- Repair verification
- Stored and transferable test results
Prioritise exposure.
Compare sites, service regions or equipment groups with one consistent operating definition.
Expose repeat work.
Separate first-visit effort from the cost and delay caused by unresolved cases.
Connect field cost to validation.
Use recurring failure patterns to refine commissioning, diagnostics and product verification.
Test the assumption.
Compare a quote-based improvement cost with gross avoided cost and simple payback.
FAQ
Charger uptime calculator questions.
Use the model for orientation and scenario review. Use contractual definitions, operational data and verified field evidence for formal reporting.
What does the Charger Uptime Calculator calculate?
It estimates annual fault incidents, total downtime across the charging points or whole charging stations counted, failure-derived availability, onsite service costs and a user-defined scenario. It is a planning model, not an accounting statement or an SLA measurement.
What is failure-derived availability?
It is the share of entered operating hours that remains after subtracting the total downtime across the charging points or whole charging stations counted. This downtime follows from the incident frequency and duration you enter. Planned maintenance, overlapping incidents and other outage causes are not added automatically.
Should I count charging points or whole charging stations?
For this model, a charging point can charge one vehicle. Count connectors separately only if they can be used independently at the same time. When counting whole charging stations, base incidents, downtime and cost on the entire station. The selector does not convert existing values; check all inputs after changing it.
How should I value one hour of downtime?
Use the value approved by the organisation responsible for the business case. It can represent lost contribution, customer compensation, operational disruption or another internal value. Do not treat a generic market value as a fact for your network.
Continue from technical context
Turn the information into the next engineering decision.
Continue to the relevant application, current product scope or responsible comemso team.