How to run your home using V2L

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  • #275730
    Brydo
    Participant

      Not sure how safe this is but worth a read I think. I got it from a site called “Speak EV”

      Next Door Neighbour and I are both using our MG4s to power the house by V2L. (Car wired back to house via a Breaker that islands the house when the car is discharging), so 3 position switch between mains and consumer unit P1 Main P0 All Off P2 Car. so has to switch through disconnect in either direction.

      The Kia EV6 topped out at 3.5kw any more and it tripped.

      Today we decided to push the MG4s as far as we could.. As he was finding it was staying on above 3.5kw output.

      With a meter on the input, we ran 2x 600w IR Heating Panels f+ 1x400w IR Heating panel for 1.6kw

      At the same time boiling a 2.5Kw Kettle and running a 2Kw Induction Cooker Hob

      General Load of Lights TVs and Computers plus other ancillaries 800w

      Gave 6.9 Kw output. ran that stable with no issues, threw on a toaster and it kicked out and shut down, started up again as soon as the toaster load was removed.

      So it seems the MG4 is happy with a 7Kw output. Much much better than expected. Was expecting no more 3.5 max

      Making it a lot more viable as a full house running V2L

      Also let me say this test was done with a proper type 2 V2L adaptor wired up with 6mm cable and direct back to the house with 6mm armoured cable. Please dont try and pull more than a couple of Kw from those Ebay Plug in type2 to3 pin adaptors.

      The only person who got all his work done by Friday was Robinson Crusoe.
      Anything i post over three lines long please assume it is an article lol.

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    • #275736
      kezo
      Participant

        On your last V2L thread a while ago, I suggested you could use a manual changeover/transfer switch (mains-off-generator orcar for example) or as they have done.

        Not as I want to really get involved in this but, its not all as initially seems. It involves a bit of resistor trickery across two pins (wires) in the wiring of the the plug and the correct sized cable matched to what resisitor you are using, so not to overload the cable ?

        #275766
        Brydo
        Participant

          I noticed that on some hybrid inverters there is a port for a generator, you may have answered this above lol, but does a generator plug directly into the inverter it does it have to go through some magical wizardry before hand.

          Why can’t a cable directly from your BEV charging port go into the generator port on the inverter. Obviously for using V2L for powering an item like a tv the energy needs to be converted to AC but an inverter will convert the DC from the car battery to AC, so a cable from car directly to inverter, is that way to simple a solution for the magical world of electrics?

          The only person who got all his work done by Friday was Robinson Crusoe.
          Anything i post over three lines long please assume it is an article lol.

          #275777
          kezo
          Participant

            Don’t forget transfer switch’s have been around far longer than any EV or battery storage. The term generator means exactly that – a diesel/petrol generator, allthough they can be used for anything that require 2 seperate power sources.

            All thats needed with a generator in a inlet box connecting the genny plug to it and is wired to the consumer unit for example (similar to a socket). A generator outputs the same power as the grid. In the event of a powercut an automatic tranfer switch would switch to the generator position and automatically start the generator.

            With an EV or battery storage and inverter would be needed, in the same way an inverter is needed (cars onboard charger) to convert AC to DC or vice versa. This incurs losses during the conversion. A generator doesn’t, as there is current conversion.

            If your car is capable of V2L, there is no reason it can’t be connected to the generator input of an hybrid inverter and setting limits in the hybrid invertor to stay below the car’s maximum continuous V2L. However in a similar way as a petrol or diesel generator you would have a “socket” externally to connect the vehicle V2L cable into.

            Don’t get confused with earlier comments where the MG4 has something like 2.2kW V2L but, you suggested people were pulling 7kW. This is different and requires a bit of trickery, by using a resistor in the circuit, the V2L load can be increased.

             

             

             

             

            #275784
            Brydo
            Participant

              Something like this? From “EV Caboed”

              The only person who got all his work done by Friday was Robinson Crusoe.
              Anything i post over three lines long please assume it is an article lol.

              #275785
              Brydo
              Participant

                EV cables

                The only person who got all his work done by Friday was Robinson Crusoe.
                Anything i post over three lines long please assume it is an article lol.

                #275788
                Brydo
                Participant

                  The only person who got all his work done by Friday was Robinson Crusoe.
                  Anything i post over three lines long please assume it is an article lol.

                  #275789
                  kezo
                  Participant

                    Type 2 charging cable plug pinout (also type 1 & 3)

                    We are interested in pins marked:

                    CP – Control Pilot (current limit)

                    PP – Proximity pilot (plug present)

                    PE – Protective Earth

                    There is a resistor present in a charging cable across PP & PE. The value of the resistor tells the car how many amps/current to draw when charging so not overload the cable by drawing too much current….

                    13A granny charger – will have a resistor value of typically 1.5k ohm 0.5w, which tells the car not to take more than 2.3kW. The Electric Vehicle Supply Equipment has a recommended interpretation range of between 1 to 2.7k ohms. (I will put this in brackets for the rest)

                    20A (16A common) – 680 ohm 0.5w resistor (330-1k ohmes interpretation range)

                    32A – 22 ohm 1w resistor (150 – 330 ohm interpretation range)

                    Are you following me 🙂

                    Now the interesting bit – You can turn that charging cable into a V2L cable by simply changing the value of the resistor across PP and PE!

                    By replacing the resistor, that exists across PP & PE with a resistor of a suitable value, it will be technically achievable to have a V2L lead rated at 7kW! However, it may be necessary to put a link or resistor across terminals CP & PE but, I won’t be going into this any further!

                     

                     

                     

                     

                     

                     

                     

                     

                     

                     

                     

                    • This reply was modified 1 month ago by kezo.
                    #275840
                    Brydo
                    Participant

                      I’m I following you Kayzo, am I following you? Absolutely I’m right behind you. But in the unlikely circumstance that I might be LOST, I contacted the company and there’s their reply.

                       

                      The only person who got all his work done by Friday was Robinson Crusoe.
                      Anything i post over three lines long please assume it is an article lol.

                      #275849
                      kezo
                      Participant

                        Manufacturers mainly state, not to exceed the stated V2l load, which you now know is governed by a resitor for charge/discharge, to match the current capacity of the cable.  Could it be they didn’t feel obliged to tell you as a company, because of the liable risk ?

                        You can buy V2L leads with a commando plug at other end rated at the manufacturers V2L spec, which can be plugged into a commando socket, that is wired to say the generator terminal of an hybrid invertor or to a storage battery and then setting the correct parameter in the menu’s so not to pull more Amps or by using the correct size cable and a suitable resistor, this can increase the output but, not always.

                        I have edited the end of previous post now that you have seen resitor values needed. Although much of the information is available by looking in the right places, I didn’t really want to go into as stated at the beginning of the thread as, although a relatively simple modification, its not something someone should be doing unless they have knoweledge of the principle of resitors and how they work, along with the skills to carry out the work safely and by using the right equipment. Thats my opinion anyway, however I’m happy to provide them for educational purposes in the future 🙂

                         

                         

                        #275856
                        Brydo
                        Participant

                          @kezo Although I’m now an expert I will be getting an electrician to carry out the work. That’s assuming Motability have a V2L car in the scheme that I like and there’s no guarantee of that.

                          Thanks for indulging my niche interests it’s much appreciated.

                          I can’t for the life of me understand why more members aren’t interested.

                          The only person who got all his work done by Friday was Robinson Crusoe.
                          Anything i post over three lines long please assume it is an article lol.

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