Grid Point Designs
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I can help you AJ, we have experience in this arena.
Charging a DIY battery from EV charger
- Thread starter Freep
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I'm still just planning my RV setup, not started the build. I would like to see a design with all the parts that I need to charge my 48v battery bank from EV charger. 11kw is enough since that would charge my entire battery bank within an hour. I'm planning 10kwh battery bank.
Goboatingnow
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The short answer is you can’t, EVSE is either mains or specialised high power DC. This requires a very special home unit and is high voltage DC with protocol transfer via CAN ( chademo) or power line protocol ( CCS)
None of this is suitable for your project
I don't understand. What is the difference between charging a large van system of say 20 vs a tesla. Isn't a tesla the same thing but bigger?
Are you saying that their method is good but the quality of the parts is inadequate? Zendure on kickstarter is claiming they will have ev charging on their larger systems. I wonder what their workaround is?
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Goboatingnow
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Firstly the “ thing on your wall “ is NOT a charger. The charger is is you car.
A standard domestic types 1 or type 2 ( these merely refer to the plug format ) is simply a form of standard AV mains supply. In practice it’s just an extension socket. It’s NOT a chsrger
Vigo
Solar Addict
An EVSE is just a fancy ‘passthrough’ for the 240vac mains. It just communicates with the car before sending it mains voltage, the car’s onbord hardware converts the mains to dc suitable for its battery. Excepd dc fast charging as mentioned.
So the simplest way to use it is to have 240vac to ‘your battery voltage here’ charger onboard your vehicle. It would need to ‘spoof’ the evse into turning on. Getting an adapter cord that has that built in (is that a thing?) would let you run your onboard charger from that.
So the simplest way to use it is to have 240vac to ‘your battery voltage here’ charger onboard your vehicle. It would need to ‘spoof’ the evse into turning on. Getting an adapter cord that has that built in (is that a thing?) would let you run your onboard charger from that.
Ampster
Renewable Energy Hobbyist
Yes there are devices that can do that, if that was your question> The OP could look at suppliers for that niche market.
By which you mean an inverter/charger that would also have the capacity to accept current from a standard household 120v outlet? Or, would it require 2 separate devices? And further, if I had for e.g. a 20kwh system I should be looking for the largest inverter/charger I can afford to max the transfer rate? That evse company I mentioned earlier carries a number of different connectors along the lines of the j1772. Is that the type of thing you were referring to when you said "adaptor cord"?
Ampster
Renewable Energy Hobbyist
The term EVSE refers to Electrid Vehicle Service Equipment and it is typically in the US a J1772 plug connected to the charging station which is just a relay and some communication devices that turn on the relay to provide 240 volts AC and communicate to the vehicle the appropriate current to draw. As @Vigo menmtioned it is just a passthrough.
That term may also apply to equipment that can provide Direct current.
Ampster
Renewable Energy Hobbyist
I don't think that term includes an inverter or charger. As mentioned above, it is just a passthrough that has some communication.
I'm sure I misunderstand, but I thought this type of communication had to go through my inverter/charger.
Ampster
Renewable Energy Hobbyist
In the case of an EV the communication is between the charger in the car and the EVSE on the wall. In the case of the original poster if he wants to use an EVSE with a J1772 plug to charge a DIY battery then all he needs is an interface card, a J1772 socket and the Charger for his DIY battery. The interface card may need to be set up. We have not heard from the original poster in six months so I assume he found a solution What is your application? If it is an RV you could just use the typical 14-30 or 14-50 plug to connect to typical RV Park pedestals. The most important part of the communication is the EVSE communicating its capacity to the onboard charger so that the onboard charger does not overload the circuit. Is your question specific to an application with a charger that can draw 40 Amps or more? If so then you may need some communication to the charger in the event you plug into an EVSE which has a smaller capacity than 50 Amps. I presume you are getting the support from evseadapters for your application for that part of the communications?
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Goboatingnow
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If you just want mains AC no pint in using a type 1/2 EVSE , I mean just plug the charger into the standard AC socket
I want every possible source
Goboatingnow
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It’s just a source of mains !
Well, I looked up interface cards. It reminds me of my professor saying that if I wanted an A on my 40 page paper about the Jesuits trying to convert the Chinese to Christianity in 1500 I would have to develop my argument through their understanding of Quantum Mechanics.
Goboatingnow
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To activate a type 1 or 3 EVSE Is very simple it needs a resistor to ground on the control pulse.
This enables the contactor to allow mains to flow. This assumes your not interesting on determine mains power availability but just used a fixed consumption.
I built such a circuit into the handle of my j17772 connector to my leaf so that I can charge from any mains plug.
This enables the contactor to allow mains to flow. This assumes your not interesting on determine mains power availability but just used a fixed consumption.
I built such a circuit into the handle of my j17772 connector to my leaf so that I can charge from any mains plug.
And this did not interfere with its type 2 properties.
Goboatingnow
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What properties type 2 refers to the connector
