Oilpan4
Gold Member
Posts: 715
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: automatically ajusting EVSE for off-grid/current sensing

Mon Apr 29, 2019 10:23 pm

48v at 410ah is a very impressive battery bank. Are you sure you don't want to go off grid?

I only have a little 24v 255ah warehouse tug battery for powering my water well setup.
2011 white SL leaf with 2014 batt.
Chargers: Panasonic brick moded for 240v, duosida 16a 240v and a 10kw setec portable CHAdeMO
Location: 88103

BrockWI
Posts: 775
Joined: Fri Mar 28, 2014 6:28 am
Delivery Date: 28 Mar 2014
Leaf Number: 423875
Location: Green Bay, WI.
Contact: Website

Re: automatically ajusting EVSE for off-grid/current sensing

Tue Apr 30, 2019 4:46 am

I would like to, but I would need a LOT more solar (and not much more space) and a lot more batteries. Most of our useage is the geothermal heat pump that pulls 5 kw running :)
3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 200k miles - 52 mpg lifetime
EVSE level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@90k miles - 54.71Ahr - 83.64SOH - 78.44Hx - 237GID

ripple4
Posts: 80
Joined: Tue Sep 18, 2018 1:45 pm
Delivery Date: 18 Sep 2018
Location: Toledo, Ohio

Re: automatically ajusting EVSE for off-grid/current sensing

Mon May 13, 2019 11:47 am

The EVSE control box came in and opened it it up to find tie points on the board and documented where i got the signals. LED 2 did not have a test point, so i jumped on the current limiting resistor but it broke off, so i put in a through hole resistor to repair it, it was ugly, then i used black RTV to stick the wires to the board and that was mess too. I got a used j1772 handle and 20' cord off ebay and will connect it in to test it on the car. I don't have 240v at my soldering station, but i did have a 480/240 --> 120 .1KVA control transformer, I connected it backwards to power up the 240v only evse. if it works it works.

working on the code now, the flashing LEDs is a tricky angle i didn't expect, looks like i'll have to read the input twice, 1/2 second delayed, and see if its different between each reading. i'll put the code up once its done.

https://ibb.co/BcJQPWL
Image

ripple4
Posts: 80
Joined: Tue Sep 18, 2018 1:45 pm
Delivery Date: 18 Sep 2018
Location: Toledo, Ohio

Re: automatically ajusting EVSE for off-grid/current sensing

Thu May 30, 2019 11:15 am

It works! today i plugged it in and it charges the car OK, so it functions as a EVSE which is the first requirement. the time delay between when the current is changed and the car changes its draw is between an instant and about 2 seconds, so very responsive to changes. the 6 interface pins are pulled into a round connector on the side so it can be disconnected.

Image

here is a youtube video of the controller adjusting the current up to the maximum. not all of the features have been tested. the clamp-over current sensor is giving me trouble, its a learning process.



https://youtu.be/bjBkcHM5C0w

ripple4
Posts: 80
Joined: Tue Sep 18, 2018 1:45 pm
Delivery Date: 18 Sep 2018
Location: Toledo, Ohio

Re: automatically ajusting EVSE for off-grid/current sensing

Tue Jul 09, 2019 10:24 am

the code is pretty well sorted out, getting the hall effect current sensor to read well was very tricky, had to use someone else's RMS calculations, but it reads very accurately now. the controller increases and decreases EVSE pilot signal commanded current to maximum available supply or the maximum EVSE current of 16a which ever is lower. in the code I have it setup for a 18 amp max, and if the current gets close to 18a it sets the current to 6amps, and then auto increases to 16 amps on the EVSE or until it reaches the maximum allowed current without going over.

https://github.com/ripple4/auto-ajustab ... ontrol.ino

Image

I have to simulate an AC current draw using a 10a variac and a load bank, but at least i am demonstrating getting the system to increase, decrease and hold a EVSE charge current.

https://youtu.be/QjijG0nJKng

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