Was macht ein effizientes Ladegeraet aus?

What defines an efficient charger?

Efficiency is one of the most important aspects in the development of our products. This factor not only influences the value, durability and stability of a charger, but also contributes significantly to reducing the total costs of ownership (TCO).

High efficiency during the entire charging process

In the development process of the 22 kW innolectric On-Board Charger, we paid special attention to the efficiency behaviour during the entire charging process. An important factor here was that the efficiency level over the entire power range is more than 94 percent. The maximum efficiency is above 96 percent. The innolectric On-Board Charger thus represents the benchmark as a charger in the power class up to 22 kW.

Various factors enable high efficiency

The consistently high efficiency reduces power dissipation in the device and therefore also heat generation. The energy drawn from the mains for the charging process is optimally used for charging the battery in the most efficient way – it arrives exactly where it is needed.


The high degree of efficiency is made possible by several components. On the one hand, the sophisticated concept of the internal circuit design ensures optimum heat distribution in the charger. The highly efficient architecture of the On-Board Charger results in a compact product size, low charging losses and a minimal load on the cooling system. On the other hand, semiconductors based on silicon carbide technology enable the excellent efficiency of the On-Board Charger. This modern technology is the reason why the installed semiconductors work significantly more effective than comparable components.

Multiple advantages in using an efficient charger - a use case

Manufacturers and operators of commercial vehicles in particular benefit from the highly efficient results, which lead to lower life cycle costs. This can be illustrated by an explicit use case:


A manufacturer of municipal vehicles with 66 kWh battery capacity integrates in his vehicles on the one hand the innolectric On-Board Charger with 96 % efficiency at 22 kW and on the other hand an alternative device with 93 % efficiency. There is therefore a difference in power loss of 3 %. The municipal vehicles are in operation 300 days a year and are accordingly recharged 300 times a year. The charging cycle is 3 hours.


With a 3% efficiency advantage, which the innolectric On-Board Charger has over the alternative device, 2 kWh are already saved per charging process. At an electricity price of 20 cents per kWh, this is 40 cents that the customer saves for each three-hour charging process. So if the vehicle is charged on 300 days a year, the savings amount to up to 120 euros a year. This saving is due alone to the higher efficiency of the On-Board Charger.

Contact innolectric

Note: Our use case consideration does not take into account any further possible savings in the overall vehicle system that can be achieved due to the higher efficiency. These are to be considered depending on the application. Please contact us for an analysis of your vehicle concept.


Are you also interested in further information about our innolectric On-Board Charger? We will continue our product discussions and presentations even in the current situation. Please contact us if you are interested in a web meeting.

Savings caused by the high efficiency of the innolectric On-Board Charger Calculation (numbers taken from the use case)
Saving electricity at a difference of 3 % power loss 22 kWh * 3 % = 0.66 kWh
Effective saving electricity with 3 hours charging time 0,66 kWh * 3h charging time = approx. 2 kWh saving per charging process
Saved money with 3 hours charging time and a price of 20 Cent per kWh 2 kWh * 20 Cent electricity price = 40 Cent savings per charging process
Saved money at 300 charges for 3 hours per year 40 Cent * 300 charges per year = 120 € savings per year