“We rely on DC grids for high-power charging”

Rein­hausen wants to help cus­tomers oper­ate their charg­ing sta­tion infra­struc­ture eco­nom­i­cal­ly.

For years, MR has been sup­ply­ing mod­u­lar bat­tery invert­ers which are used, for exam­ple, in buffer stor­age units for charg­ing infra­struc­ture. Build­ing on these, Rein­hausen has now brought the high-pow­er charg­er GRIDCON® HPC to the mar­ket. This rapid DC charg­ing sys­tem uses gal­van­i­cal­ly iso­lat­ed AC/DC con­vert­ers to enable intel­li­gent load man­age­ment, the set­up of indi­vid­ual DC grids and even the con­nec­tion to exter­nal DC grids. We spoke with Hol­ger Kret­zschmar, head of sales for this prod­uct seg­ment, and dis­cussed the advan­tages that come from the direct cou­pling of charg­ing sta­tions and bat­tery stor­age units.

Mr. Kretzschmar, what is special about Reinhausen’s strategy for charging infrastructure?

From the begin­ning, we set the goal of cre­at­ing the most effi­cient sys­tem pos­si­ble, with which we can keep the num­ber of con­ver­sions between DC and AC cur­rent as low as pos­si­ble and which is simul­ta­ne­ous­ly equipped for the chal­lenges of the future.

Which challenges do you mean specifically?

In order to lead the dynam­ic start of E‑mo-bil­i­ty, charg­ing infra­struc­ture will need to be scaled mas­sive­ly in the com­ing years both through many more charg­ing points and also through high­er out­puts for busses and cars up to the MW range. In this phase, it becomes sig­nif­i­cant­ly more about high­ly effi­cient solu­tions and max­i­mum flex­i­bil­i­ty. If you car­ry this to its log­i­cal con­clu­sion, you inevitably come to “local DC grids”.

“New approach­es are need­ed to cou­ple DC charg­ing tech­nol­o­gy with renew­able ener­gy pro­duc­tion and buffer stor­age.”

GGRIDCON® HPC is a charg­ing sta­tion with a con­nec­tion to the AC grid on the one hand, but it can also pro­vide a DC grid for oth­er charg­ing sta­tions and for con­nect ing ener­gy accu­mu­la­tors and PV sys­tems at the same time. The con­nec­tion to the AC grid can be flex­i­bly dimen­sioned or even omit­ted entire­ly in cer­tain cas­es.

This opens up many pos­si­bil­i­ties. On the prod­uct side, this type of set­up can achieve an enor­mous effi­cien­cy increase. This is because, no mat­ter where you get your ener­gy in the future, whether from a solar sys­tem, tem­po­rary stor­age in a bat­tery unit, or from an AC or DC grid, you will only ever need a max­i­mum of two con­ver­sion stages. This helps cus­tomers to pay less in fees and to avoid unnec­es­sary con­ver­sion loss­es.

Con­ven­tion­al con­nec­tion to the AC grid.

With tech­nol­o­gy from Rein­hausen: the charg­ing sys­tem from Rein­hausen that enables more effi­cient expan­sion of the charg­ing infra­struc­ture and reduces con­ver­sion loss­es and con­nec­tion fees. Anoth­er advan­tage of the Rein­hausen archi­tec­ture is that it can be inte­grat­ed into DC grids or can be used to set up inde­pen­dent DC grids using the inte­grat­ed invert­er.

The flex­i­bil­i­ty of the sys­tem also helps the ener­gy sup­ply grid, which is becom­ing increas­ing­ly strained. Using bidi­rec­tion­al invert­ers, we can relieve weak grids dur­ing peaks or sup­ply them with solar pow­er and even achieve a sta­bi­liz­ing effect on grid faults. This reduces the costs for grid expan­sion. All of this helps our cus­tomers achieve more eco­nom­i­cal oper­a­tion or even new busi­ness mod­els.

What options do you see here?

For one, local­ly pro­duced renew­able ener­gy can be sold direct­ly to E‑mobility cus­tomers with sig­nif­i­cant­ly high­er mar­gins than pur­chased elec­tric­i­ty from the AC grid. A buffer stor­age unit can also be used for this, of course, in order to get afford­able ener­gy from the grid in times of excess pow­er, for exam­ple, and lat­er feed it back into the grids at a high­er price.

With the same log­ic, thanks to our com­plete­ly bidi­rec­tion­al charg­ing sys­tems, even the unused bat­tery capac­i­ty of parked vehi­cles, for exam­ple at a bus depot, can be used to do this. While the lat­ter is still a top­ic for the future, we can already set up space-sav­ing, afford­able solu­tions for charg­ing these bus­es and cars today with our inno­v­a­tive approach, both in depots as well as along the route.


Hol­ger Kret­zschmar, Head of Sales — Pow­er Qual­i­ty Prod­ucts

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