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 points are each unavailable for two hours, the total is 20 unavailable unit-hours. If only one point is down for two hours, it is two unit-hours. Unit-hours mean charging points multiplied by unavailable hours; they do not by themselves establish lost revenue or utilisation.
Interactive calculator
Build the annual downtime and service-cost scenario.
Illustrative values are loaded to show the model. Replace every value before using the result in an internal decision. The calculation runs locally in the browser.
Transparent method
Every result can be traced back to four equations.
The model separates technical downtime from field-service effort. It does not hide assumptions behind an industry average.
Annual incidents
Units in scope × incidents per unit and year
Unavailable unit-hours
Annual incidents × average unavailable hours
Failure-derived availability
1 − unavailable unit-hours ÷ available operating unit-hours
Annual operating cost
Downtime impact + first visits + repeat visits + other incident cost
Use one system boundary.
Count charging points, connectors or cabinets consistently. Mixing units produces a percentage that looks precise but has no operational meaning.
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 unit, time base and cost logic are preserved.
- Entered failure frequency
- Average unavailable time per incident
- Operational impact per unavailable unit-hour
- First onsite visit cost
- 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 failure events, unavailable unit-hours, failure-derived availability, first onsite visits, repeat visits, other incident costs and a user-defined improvement 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 time that remains after subtracting the unavailable unit-hours caused by the failure frequency and downtime entered in the calculator. Planned maintenance, overlapping incidents and outage causes outside the model are not added automatically.
Should I enter chargers, charging points or connectors?
Choose one unit and use it consistently across the complete calculation. A cabinet with two simultaneously usable connectors may need to be counted differently from a single charging point, depending on the operational definition used by the network.
How should I value one unavailable unit-hour?
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.