On behalf of Swedish green-tech company Charge Amps, an electro engineer student at the Ångström Laboratory of Uppsala University has written a master's thesis of 30 academic points on the topic "Electric Car Charging in and adjacent to residential properties". The aim was to examine how to vigorously expand charging infrastructure in residential and office buildings. The mathematician Mr Joakim Munkhammar, PhD in EV charging at the University of Uppsala, decided that a laboratory and modelling would best be based on six connected boxes at (3.7kW) 16A with a 3-phase installation and with the six most common EVs and plug-in hybrids.
- For some time Charge Amps hypothesis has been that an installation of online charging boxes with load balancing over phases and allocation of charging current between the vehicles and the hours of the day can and will facilitate many EVs without risking any unwanted power peaks. This has now been academically tested and we are pleased to present the results for condominiums and commercial properties, says Charlotte Eisner, CEO of Charge Amps.
In his master’s thesis, Andreas Lundgren has proven that the same-storage-effect is such that the charging of six electric vehicles in a property with a 1-phase 16A charging box per car, even without load control, works without giving rise to costly power peaks for the mains. (The interleaving effect, or same-storage-effect, is the maximum power drawn taking into account that electrical consumers in a loading area are not charging/using the power lines all at the same time during the day. With Charge Amps solution for load balancing and -control of six electric cars or more, in groups of six parking spots, with 3-phase installation of HALO Wallbox™ kW the threshold for property owners was found to be low. This, is good news for the property owners of apartment buildings and commercial properties, and good for taking on the CO2 emissions in order to reach the 2030 climate goal.
UPTEC ES16 016
Degree project 30 points in June 2016
Electric Car Charging adjacent to residential property modeling of the storage effect
Subject examiner Joakim Munkhammar
Supervisor Charlotte Eisner