When talking about electric vehicle charging, discussions often focus on power, charging time, or infrastructure sizing. Yet one metric remains little known, even though it’s crucial for fleet operators: the charging station availability rate.
So, what exactly is it? How does Chargepoly calculate it? And why is it strategic for truck and bus fleet operators? Here’s the breakdown.
What is the availability rate?
The availability rate measures the time a charging station is fully operational and accessible for charging. It’s usually expressed as a percentage over a given period (e.g., a month or a year).
A station with a 99% availability rate means it was fully functional 99% of the time, excluding planned maintenance or technical/network outages caused by external factors.
How does Chargepoly calculate it?
At Chargepoly, this metric is not an estimate — it is based on reliable real-time data collected via our technical supervision platform.
Our difference? Unlike all-in-one systems, our architecture is distributed: a shared Power Unit and multiple charging satellites. This design allows us to monitor and calculate availability at two levels:
- Power Unit: measures power availability
- Each satellite: measures availability of individual charging points
Here’s how we do it:
- 24/7 monitoring of all equipment (satellites + PU) via our platform
- Automatic detection of anomalies, downtime, or performance drops
- Exclusion of planned maintenance periods (communicated in advance to the client)
- Precise calculation of the ratio between actual uptime and expected operating time, for each element (PU and satellites)
This granular monitoring enables us to optimize overall station reliability and deliver a high, objectively measured level of service.
Why is a high availability rate so important?
For fleet managers, every minute of downtime at a charging point or any drop in performance can have operational and financial consequences:
- Operational reliability: Scheduled charging must start and finish on time; otherwise, entire routes may be compromised.
- Cost optimisation: Unavailable stations can create extra costs (lost work hours, rescheduling, alternative solutions).
- Driver confidence: A reliable network motivates field teams — they don’t have to wonder, “Will it work today?”
- Return on investment: Downtime means underutilized infrastructure. Maximising availability ensures faster ROI.
Chargepoly aims for >99% availability
Our stations are designed to last, with an industrial approach to reliability:
- Adaptable architecture to ensure service continuity
- Preventive maintenance through full monitoring and tailored alerts
- Responsive, committed technical support
- Robust design to withstand fleet demands (high power, intensive use, outdoor conditions)
Our target: exceed 99% availability, and we’ve already achieved this on multiple customer installations.
In summary
The availability rate is a key performance indicator for any charging station. At Chargepoly, it is rigorously measured, continuously monitored, and optimized, taking into account both power and individual charging points.
Because fast charging is good, but charging delivered on time, as planned, is even better.
Manage a truck or bus fleet and looking for a reliable, sustainable, turnkey charging infrastructure? Let’s talk!
