Mobile DC charger

[apolyshow]

Good morning everybody from Greece,

I am new at your forum, dont know too much and i will apreciate your help if you can offer to me .
One of my customers, need a movable DC Charger to power up empty electric car batteries that cant be moved .
So he needs to charged them just a littkle bit and then drive them to a stable charger for the rest of charging .
Is there someone that could help me find what do i need to build it ?

[uhi22]

Do you think of CCS? Or Chademo? Is AC charging no option?

[0tik]

There are open source CCS controllers on car's side. If anyone made one for charger side, it could be possible to use onboard AC chargers as a DC source.
AC power source -> stack of OBC chargers -> CCS Comms-> vehicle. So basically unlimited power (and limited voltage by OBC hardware)

[zippy500]

sounds like he needs a small petrol genny with a granny charger, saw a vid where a guy used a genny on his stranded tesla he only needed a couple of miles to get to the charging station

[elsamuse]

Good morning everybody from Greece,

I am new at your forum, dont know too much and i will apreciate your help if you can offer to me .
One of my customers, need a movable DC Charger to power up empty electric car batteries that cant be moved .
So he needs to charged them just a littkle bit and then drive them to a stable charger for the rest of charging .
Is there someone that could help me find what do i need to build it ?

Do you want to make it yourself, or buy it?

[uhi22]

There are open source CCS controllers on car's side. If anyone made one for charger side, it could be possible to use onboard AC chargers as a DC source.
AC power source -> stack of OBC chargers -> CCS Comms-> vehicle. So basically unlimited power (and limited voltage by OBC hardware)

The open source solution for the charger side exists: FoccciCape on a beaglebone running pyPLC. As starting point e.g. github.com/uhi22/DiDeBoCCS

[0tik]

Oh my god this is brilliant. Solves the "80% charge limit" complaint ever since first EVs rolled onto the streets. Loads of people were complaining that they can't set a limit to charge to 80% (or 50% for long term storage). If soc is being sent out by the CCS/type-1/2 socket of the car during AC charging then you can make a mitm plug or entire proprietary evse brand and make a fortune on it. Although I suspect that nowadays it could be that nobody stresses over charging to 100% anymore... Oh wait- New cars probably have this option already and old cars with chademo don't send out soc over AC port.

[Matoleno]

Good morning everybody from Greece,

I am new at your forum, dont know too much and i will apreciate your help if you can offer to me .
One of my customers, need a movable DC Charger to power up empty electric car batteries that cant be moved .
So he needs to charged them just a littkle bit and then drive them to a stable charger for the rest of charging .
Is there someone that could help me find what do i need to build it ?

Hi, depending on your requiremens (mainly charging power/speed), skill set and budget, there are multiple options...

Quick question to start with - why DC? could you not use the onboard AC charger in the car?
Or are you trying to charge directly a HV battery (outside of a donor vericle)? this will make it lot more complicated.

Option 1 - AC charging (based on Dala's Battery Emulator) - would allow 7kW single phase or 2okW 3 phase AC changing
- get a big enough EV battery (from the compatible list)
- battery emulator
- HV AC inverter (from the compatible list - for example 25kW Deye HV 3phase inverter)

Option 2 - DC chagring- start with the AC option as above and add commercial EV DC charger
- all of the above from option 1 (if more power is needed just add extra inverter)
- standard DC charger (like Delta DC wallbox 50KW or Evec 40kw) - you will find units from about 20KW to about 50kW

Option 3 - DC charging DYI - start with the AC option as above and add commercial EV DC charger
- all of the above from option 1 (if more power is needed just add extra inverter)
- DYI DC charger (I have built mine with Rpi using Uhi's PyPLC + Arduino DUE to control Tesla Gen 3 OBC and other bits and pieces..

The option 3 has lot of chalanges.. (I know I worked through most of them.. my solution works-ish, but its messy)