DIY Home EVSE

[widodh]

I am not sure what version you are refering to but here is the latest experimental code form GITHUB and the stable code from google code...
GITHUB line 1222 svclvl = 1; // L1
https://github.com/lincomatic/open_e.../open_evse.pde

code.google line -1223 svclvl = 1; // L1 same line should also be added to line 1208
http://code.google.com/p/open-evse/s.../open_evse.pde

Ah, you are right!

I prefer Github btw, much easier to use GIT with branching I'll probably send you a couple of patches to make 3-phase easier.

[TEG]

This almost looks home made:
[EV Tradin' post] - EVSE J1772 Charging Station for Electric Vehicles
EVSE J1772 Charging Station for Electric Vehicles, Leaf ,Volt and Focus | eBay

[hcsharp]

This almost looks home made:

That's because it IS homemade.
Only rated for 25A??? It looks like a lot of phantom load when charging and not charging. I'll bet that thing consumes 15 or 20 watts when it's charging (on top of what's going to the car).

[widodh]

I finally got my 3-phase 40A relays and hooked it up to see if it worked.

It works, but it seems the load is to high for the EVSE board. My multimeter is showing me that the relays is using about 450mA, while the board is designed for 300mA, correct?

The big black thing labeled "MPD D107E" gets warm and starts to make a "sissing" noise.

Next to the relays connection there is a 12V/GND connection on the board. What is the maximum load for that? If that can handle the 450mA better I'll probably buy a small relays in between to switch on the big relays.

[Chris1howell]

I finally got my 3-phase 40A relays and hooked it up to see if it worked.

It works, but it seems the load is to high for the EVSE board. My multimeter is showing me that the relays is using about 450mA, while the board is designed for 300mA, correct?

The big black thing labeled "MPD D107E" gets warm and starts to make a "sissing" noise.

Next to the relays connection there is a 12V/GND connection on the board. What is the maximum load for that? If that can handle the 450mA better I'll probably buy a small relays in between to switch on the big relays.

450ma @ 12V (5.4W) is far too much. The OpenEVSE Power supply is only 4W. The OpenEVSE board and Adafruit LCD use less than 1.5w leaving more than 2.5w for the relay... The D107E is he DC/DC converter for the pilot. It is probibly getting hot due to a voltage drop when the relay kicks in... Is your relay avaliable with a 230v coil? You can use a much smaller relay to switch 230V to your 3 phase relay and stay within the 4W.

[widodh]

450ma @ 12V (5.4W) is far too much. The OpenEVSE Power supply is only 4W. The OpenEVSE board and Adafruit LCD use less than 1.5w leaving more than 2.5w for the relay... The D107E is he DC/DC converter for the pilot. It is probibly getting hot due to a voltage drop when the relay kicks in... Is your relay avaliable with a 230v coil? You can use a much smaller relay to switch 230V to your 3 phase relay and stay within the 4W.

I can't return the relay anymore, it was a special order.

The 230V version is also much more expensive.

I think I'll take a doorbell transformer which outputs 12V 1A and use a small relay to use the doorbell transformer to turn on the big relay.


12V doorbell transformer ----> Relay connected to EVSE ----> Big relay

[EV_de]

Try one of these :

small solidstate relais 12V DC IN -> 48V DC 0,5A out

http://catalog.weidmueller.com/procat/Product.jsp;jsessionid=2DC616337944A5B290917AE029AA7141?productId=%28[8950970000]%29&page=Product

or

http://www.elektro4000.de/Neue-Artik...0::237129.html

[mitch672]

Just an FYI, OpenEVSE released new firmware that allows setting the pilot amperage via a 1 button menu system, viewed on a 2X16 RGB LCD display, see the homepage for pictures: http://code.google.com/p/open-evse/

Also in the news Leviton is now selling 30A J-1772 cable, 25' long for $126, this has brought down the price of building a 30A portable OpenEVSE to a little over $400, see my build link below, which has been updated with the new lower cost Leviton J-1772 cable: http://code.google.com/p/open-evse/w...SE_by_mwolrich

Mitch

[widodh]

Just an FYI, OpenEVSE released new firmware that allows setting the pilot amperage via a 1 button menu system, viewed on a 2X16 RGB LCD display, see the homepage for pictures: http://code.google.com/p/open-evse/

Also in the news Leviton is now selling 30A J-1772 cable, 25' long for $126, this has brought down the price of building a 30A portable OpenEVSE to a little over $400, see my build link below, which has been updated with the new lower cost Leviton J-1772 cable: http://code.google.com/p/open-evse/w...SE_by_mwolrich

Mitch

Nice!

I'm still working on my 3-phase version, but that should be up and running in about 4 weeks I think.

[dwegmull]

My own EVSE is done! I started this effort before I was aware of the open EVSE project; however I decided to continue with my own design mostly for my own education. While the J1772 part itself was fairly strait forward, the GFCI, was another matter...
I can confirm that off the shelf GFCI "donut" modules designed for hot tubs do not work with the Roadster! The unit I bought did provide a nice coil that I ended up using with my own circuit.
I put all my design notes (including schematic and source code) in one document here: J1172 Design Notes - Google Docs
Here is a picture of the finished unit: