Very honorable practice: Fixing the HW-Bugs at the source, and keep the SW as intended. Many companies behave differently - they develop faulty HW, and later fix that by SW! ;-)
You can use it to charge your car from a house connection/power bank, but is it also possible to charge your power bank from a charging station because something like this would be interesting for many people who are out and about with their e-bikes, e-scooters, etc. in order to then charge them again be able
Adapters for this do exist for both type 1 and type 2. Got to be careful with them in the US as EV chargers are usually wired as 220V not 110, thankfully something like an ebike charger will probably support both voltages just fine but it's something to watch out for
I tested directly supplying mains to my Tesla and it really didn't like it! It was not happy with any circumstance where there was mains before it had called for it.
Julian, I really do find your videos fascinating. I hope one day I will be able to totally understand what is going on. Keep up the good work and, "Duh, Duh, Duh, Dut.... Duh, Duh!! Charge It!! (That is supposed to be a Bugle and the battle cry). :-)
Congratulations on the project. I am also implementing an ac charger, ampacity of 32 A. I am using esp32 and 4N35 to generate pwm +12/-12 VPP, with 1 kHz. To identify whether a vehicle is connected and whether the vehicle is ready for charging, I am using an LM393 (two comparators), one set to 9.4 volts and the other to 6.3 volts. The LM393 output is open collector. In the ESP32 used with GPIO with PULLUP, when it goes to logic level "0", I make the decisions. Everything works very well. I just noticed that on the CP pin, the signal is no longer +12/-12 but a positive signal of +12 VDC (1khz)? It seems that my LM393 circuit is harvesting the negative part of the wave. How did you check the voltages on the CP pin?
Not LM393, It is diode after EVSE CP output. And you should measure CP PWM 6V/3V with respect to 1. Cathode of Diode (same as these are connected2.74k, 1.3k, and 270 ohms ). 2 Ground (other end of these are connected2.74k, 1.3k, and 270 ohms). Now you measure CP signal across 1 and 2.
This project is fascinating, but I can't remember when Julian started using Arduino in this project. I do recall how the original intent was to do the whole thing without Arduinos... :)
So it really needs -12v ? can't just do +12v and gnd? I want to use the most minimal circuit I can get away with for the CP signal. I have a few l298 chips that can output -12v and +12v as motor control, that seems the simplest way if -12v is required. what you think.
Nice project Julian. It is 2022 though so you should probably ditch that Arduino and use a esp8266 or an esp32 and then you can give it wifi capability and put up a webpage to control it remotely from your phone or a computer and/or feedback useful information like temperature of the live relay...
I found that opto-relays are very slow, but then they are design to mimic relays. other opto-couplers are a lot faster. i tried to put a rs232 signal through the opto-relays and it just did not work at all. more swings than roundabouts :-)
Hi, would it be possible to please explain the Arduino connections? I am trying to replicate the circuit using an Arduino Mega, and was a bit confused. The 5V and 0V connection can be supplied through the analog pins of Arduino and the "Out" pin should be the digital PWM pin? Is that understanding correct? Many thanks in advance
The standard allows changing during charging. This is quite common too. A lot of charge points default to 1kW at initial connection and then ramp up to their final target. Also quite common if you have a charge point with 2 connectors serving two bays, if just one is in use then it supplies upto 7.2kW, but when the second is in use, it'll switch to 3.6. There's also some charge points that pull shenanigans according to available solar
Yes the current can be varied without stopping the charge session. That's important for the next stage - varying the charge current to match the output from my solar panels.
@@JulianIlett The fact that this isn't already implemented ubiquitously on all EVSE, on all Vendors baffles me... No, you have to buy a home energy management system with cloud connection to automate this "intelligent" charging.
@@michac3796 It's definitely better this way - then you control how 'intelligent' the system is. There's nothing worse than being stuck with some vendor's definition of what is intelligent and you having no control over what it decides to do!
@@stevefox3763 In EV's the power for your audio comes from your "normal" 12V battery, just like your IC car. So no difference. Stop trying to look for excuses for staying with IC cars, you Luddite.
@@fredstarkey3425 i know that, im not an idiot but maybe you are seeing as name calling is your level. You think power is infinite in an EV and you think it has the headroom to handle the massive current draw and in violent pulses at that on the 12v system? Why dont you try Spiking your system with 250A 150 times a min for hours every week and see how it copes.
@@JulianIlett Brilliant thanks, now I remember 😊. When I finally get my EV conversion running I want to charge it from solar panels too so if you manage to crack it please share.
@@JulianIlett I forgot to mention I have a Solar iBoost on my system that diverts spare solar power to my hot water tank instead of sending it to the grid. I think it works by sensing the current direction at the meter but I've no idea how it knows how much power to send to the hot tank as I don't think it is connected to the inverter. I guess it maybe ramps up slowly and then maintains a steady current to the immersion heater when it reaches equilibrium. Are you planning to do something similar.
Very honorable practice: Fixing the HW-Bugs at the source, and keep the SW as intended. Many companies behave differently - they develop faulty HW, and later fix that by SW! ;-)
If you can vary current you can add PV monitoring to charge the car only when there excess of power from PV system.
You can use it to charge your car from a house connection/power bank, but is it also possible to charge your power bank from a charging station because something like this would be interesting for many people who are out and about with their e-bikes, e-scooters, etc. in order to then charge them again be able
Adapters for this do exist for both type 1 and type 2. Got to be careful with them in the US as EV chargers are usually wired as 220V not 110, thankfully something like an ebike charger will probably support both voltages just fine but it's something to watch out for
I tested directly supplying mains to my Tesla and it really didn't like it! It was not happy with any circumstance where there was mains before it had called for it.
Julian, I really do find your videos fascinating. I hope one day I will be able to totally understand what is going on. Keep up the good work and, "Duh, Duh, Duh, Dut.... Duh, Duh!! Charge It!! (That is supposed to be a Bugle and the battle cry). :-)
Congratulations on the project. I am also implementing an ac charger, ampacity of 32 A. I am using esp32 and 4N35 to generate pwm +12/-12 VPP, with 1 kHz. To identify whether a vehicle is connected and whether the vehicle is ready for charging, I am using an LM393 (two comparators), one set to 9.4 volts and the other to 6.3 volts. The LM393 output is open collector. In the ESP32 used with GPIO with PULLUP, when it goes to logic level "0", I make the decisions. Everything works very well. I just noticed that on the CP pin, the signal is no longer +12/-12 but a positive signal of +12 VDC (1khz)? It seems that my LM393 circuit is harvesting the negative part of the wave. How did you check the voltages on the CP pin?
Not LM393, It is diode after EVSE CP output. And you should measure CP PWM 6V/3V with respect to 1. Cathode of Diode (same as these are connected2.74k, 1.3k, and 270 ohms ). 2 Ground (other end of these are connected2.74k, 1.3k, and 270 ohms). Now you measure CP signal across 1 and 2.
This project is fascinating, but I can't remember when Julian started using Arduino in this project. I do recall how the original intent was to do the whole thing without Arduinos... :)
So it really needs -12v ? can't just do +12v and gnd? I want to use the most minimal circuit I can get away with for the CP signal. I have a few l298 chips that can output -12v and +12v as motor control, that seems the simplest way if -12v is required. what you think.
Pure Magic in the title
@@2000jago The 'magic' is what is implied
Nice project Julian. It is 2022 though so you should probably ditch that Arduino and use a esp8266 or an esp32 and then you can give it wifi capability and put up a webpage to control it remotely from your phone or a computer and/or feedback useful information like temperature of the live relay...
There's no need for this to be 'internet connected'. I'll be using an nRF24 wireless link between the solar panels and the car charger.
I found that opto-relays are very slow, but then they are design to mimic relays. other opto-couplers are a lot faster. i tried to put a rs232 signal through the opto-relays and it just did not work at all.
more swings than roundabouts :-)
TTL Time to live (TTL) Would be better With low Speed opto-couplers However Ethernet opto-couplers can Do much Faster (10GBits)
Morning :-)
@@fredflintstone1 well a good morning Fred it is ;-)
are you going to make it Ocpp compatible?
Can you tell me how to make charger for lifepo4 battery which is 38.4 v means 12 cells in series and 12ah capacity 43.8v charger ?
Hi, would it be possible to please explain the Arduino connections? I am trying to replicate the circuit using an Arduino Mega, and was a bit confused. The 5V and 0V connection can be supplied through the analog pins of Arduino and the "Out" pin should be the digital PWM pin? Is that understanding correct? Many thanks in advance
Can you change the charge current while it's charging or do you have to stop and start it?
The standard allows changing during charging. This is quite common too. A lot of charge points default to 1kW at initial connection and then ramp up to their final target. Also quite common if you have a charge point with 2 connectors serving two bays, if just one is in use then it supplies upto 7.2kW, but when the second is in use, it'll switch to 3.6. There's also some charge points that pull shenanigans according to available solar
Yes the current can be varied without stopping the charge session. That's important for the next stage - varying the charge current to match the output from my solar panels.
@@JulianIlett The fact that this isn't already implemented ubiquitously on all EVSE, on all Vendors baffles me...
No, you have to buy a home energy management system with cloud connection to automate this "intelligent" charging.
@@michac3796 It's definitely better this way - then you control how 'intelligent' the system is. There's nothing worse than being stuck with some vendor's definition of what is intelligent and you having no control over what it decides to do!
What model of scope is that. The size is great for the type of things I would use a scope for.
You can find similar scopes on Ali Express for under 50 USD.
super videi
YAY
Ev are an interesting new take on motoring but i worry about the day im forced into one because of my love of audio :(
How is your love of audio impacted by EVs?
Eh?
@@sailingoctopus1 the massive demand on power.
@@stevefox3763 In EV's the power for your audio comes from your "normal" 12V battery, just like your IC car. So no difference. Stop trying to look for excuses for staying with IC cars, you Luddite.
@@fredstarkey3425 i know that, im not an idiot but maybe you are seeing as name calling is your level.
You think power is infinite in an EV and you think it has the headroom to handle the massive current draw and in violent pulses at that on the 12v system?
Why dont you try Spiking your system with 250A 150 times a min for hours every week and see how it copes.
I love this series but can't for the life of me remember why you're doing it. 😕
1. To learn how car chargers work.
2. To charge the car with the same number of Watts that the solar panels are producing.
@@JulianIlett Brilliant thanks, now I remember 😊.
When I finally get my EV conversion running I want to charge it from solar panels too so if you manage to crack it please share.
@@JulianIlett Got solar panels coming soon, just ggot to work out how to convert 240V's in to diesel ;-)
@@JulianIlett I forgot to mention I have a Solar iBoost on my system that diverts spare solar power to my hot water tank instead of sending it to the grid. I think it works by sensing the current direction at the meter but I've no idea how it knows how much power to send to the hot tank as I don't think it is connected to the inverter. I guess it maybe ramps up slowly and then maintains a steady current to the immersion heater when it reaches equilibrium. Are you planning to do something similar.
👍