Dual head J1772 electric vehicle charging station / splitterDesigned by Geppetto Electronics in United States of America
What is it? The J1772 Hydra is a two headed J1772 electric vehicle charging station. There are two board variants. One is a standalone charging station that plugs in (or is hardwired) into a standa...Read More…
The J1772 Hydra is a two headed J1772 electric vehicle charging station. There are two board variants. One is a standalone charging station that plugs in (or is hardwired) into a standard 208/240 volt electric circuit. The other has a J1772 inlet and can be used to share an existing J1772 charging station with two vehicles.
The Hydra has two operating modes. In the "Sharing" mode, when both cars request power, each is given 50% of the available power. When one car finishes, the other car is boosted up to 100% power. In the "Sequential" mode, one car is given 100% power until it finishes, and then the other car is given an opportunity to charge.
The EVSE variant includes a real-time clock and timer system - particularly helpful for two EV households that have time-of-use electric metering. You can charge both cars overnight without switching the plug in the middle of the night!
The splitter variant is intended to be used to share charging stations that are already installed and operating. It can be configured with separate power (120/208/240VAC 50/60Hz) so that the host EVSE is only turned on when a car wants power, or it can be configured to obtain power from the host EVSE (turning it on immediately on connection).
Both Hydras operate in full compliance with the J1772 and all relevant safety standards. The EVSE variant includes a ground-fault detector, and both variants include a ground impedance testing and stuck relay detection system. Both variants also include ammeters to insure that neither car draws more power than it is allowed at any given moment (and to show how much current each car is drawing). The firmware of the Hydra insures that the available current (either as indicated by a host EVSE for the splitter variant, or as configured by the installer for the EVSE variant) is never exceeded.
The heart of the hydra is two PCBs - an HV / power board that has all of the high voltage components, and a logic/display board with the rest of the circuitry. An FFC cable connects the two.
This item is just the two circuit board assemblies. To build a complete Hydra, you must add a chassis/enclosure, two two-pole contactors, two J1772 cable/plug sets, two current transformers, a power distribution manifold and and a number of other wiring components and cabling. See the documentation for a full rundown on what you need. The Hydra boards assemblies themselves are fully assembled, so the rest of the construction requires no soldering.
I leased an EV because there were charging stations at the office and the idea of having half my commute expenses paid for by the company was attractive. Unfortunately, the charging stations were oversubscribed, and a great number of users were cars that charged at 3.3kW - effectively only using half of available power of the charging station. The J1772 Hydra was born to allow the charging stations to be fully utilized. Later, we leased a second EV, and I created the EVSE variant to allow us to charge both of them at once without having a separate "host" EVSE.
To my knowledge, the J1772 Hydra remains unique. It's the only solution to seamlessly share a J1772 charging station with two cars while still remaining fully compliant with the J1772 specification and all relevant safety standards, and one of only two available double-headed, single circuit charging stations (and the other one is intended for public, commercial installations).
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Dmitriy | Oct. 5, 2017
Lansing | Jan. 20, 2016
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