EnerCollege

Today in response to the call of green travel and to alleviate pollution of automobile exhaust, electric vehicles have gradually seep into people's routine life and become a necessity. As things are at the moment, the main power source for the popular electric vehicles in the market is utility grid, however, the increasing number of electric vehicles will inevitably cause grid pressure and lead to some kind of limitation for EV charging. To resolve this conflict and also improve the efficient use of energy, solar charging is introduced to ATESS EV charging technology.

Today solar energy storage inverter undoubtedly has been a common choice for residential and industrial power supply, for now there are two ways to construct medium to large-scale applications: one is to use single high-power inverter; the other is to use several smaller inverters in parallel. Single high-power inverter might have disadvantage in volume, quality, installation and other aspects. In addition, the reliability of single high-power scheme is relatively poor, one error may make the whole system paralyzed. Therefore, the technology of parallel connection is worth being applied in wider field.

Usually, in a home or building installation, regular load appliances and EV charger together share the power limit from the grid; building load equipment is first priority, so the EV charger will need to limit its loading power dynamically according to variations of the building's load power in such cases. It ensures the load equipment operation meanwhile keeping the EV charged at maximum available power.

In the previous ATESS white paper, we have introduced the automatic power distribution function of the ATESS EV charger. There are usually household or office appliance in the installation site, and the installation is limited by the total power distribution capacity. Then what can we do to ensure normal use of the load and with the premise of not exceeding the total power? The key is that the EV charger needs to have dynamical adjusting function, to automatically tune the charging power according to the load capacity.