Integrating EV SOC (State of Charge) data: OVMS

[glynhudson]

For demandshaper to be useful for EV charge scheduling the demand shaper ideally needs to know the current SOC (state of charge of an EV). Unfortunately it's not possible to obtain SOC data via the J1772 EV charging protocol.

Various EV's have different proprietary API's retrieve SOC. The API's are often unpublished and reverse engineered. We will try and add support for all EV's (starting the Tesla). However, as a first implementation we have tested integrating with OVMS (Open vehicle Monitoring system). OVMS is an open-source hardware/software telematics platform that supports many types of EV's and is totally independent to the manufacturer.

See OVMS user guide

Data can be retrieved from OVMS via their mobile app, MQTT or HTTP rest API (if using dexters-web OVMS server, default in Europe). See issue openvehicles/Open-Vehicle-Monitoring-System-3#178

Here is an example API call to retrieve OVMS data:

https://dexters-web.de/api/call?fn.name=ovms/export&fn.vehicleid=XXXXXX&fn.carpass=XXXXX&fn.format=csv&fn.types=D,S&fn.last=1
Example responce:

#FILE,d.csv
rec_time,0,doors1,doors2,lockunlock,tpem,tmotor,tbattery,trip,odometer,speed,parktimer,ambient,doors3,staletemps,staleambient,vehicle12v,doors4,vehicle12v_ref,doors5,tcharger,vehicle12v_current
2019-03-13 17:44:08,0,192,0,5,11,0,12,0,434390,0,0,11,0,1,1,14.41,0,12.6,0,0,0,18
#FILE,s.csv
rec_time,0,soc,units,linevoltage,chargecurrent,chargestate,chargemode,idealrange,estimatedrange,chargelimit,chargeduration,chargeb4,chargekwh,chargesubstate,chargestateN,chargemodeN,chargetimer,chargestarttime,chargetimerstale,cac100,charge_etr_full,charge_etr_limit,charge_limit_range,charge_limit_soc,cooldown_active,cooldown_tbattery,cooldown_timelimit,charge_estimate,charge_etr_range,charge_etr_soc,idealrange_max,chargetype,chargepower,battvoltage,soh
2019-03-13 17:44:08,0,28.0,M,0,0,stopped,standard,24,0,0,0,0,0,13,21,0,0,0,0,57.22,0,0,0,0,-1,0,0,0,0,0,0,0,0.00,368.50,86

rec_time	0	soc	units	linevoltage	chargecurrent	chargestate	chargemode	idealrange	estimatedrange	chargelimit	chargeduration	chargeb4	chargekwh	chargesubstate	chargestateN	chargemodeN	chargetimer	chargestarttime	chargetimerstale	cac100	charge_etr_full	charge_etr_limit	charge_limit_range	charge_limit_soc	cooldown_active	cooldown_tbattery	cooldown_timelimit	charge_estimate	charge_etr_range	charge_etr_soc	idealrange_max	chargetype	chargepower	battvoltage	soh
17:44:08	0	28.0	M	0	0	stopped	standard	24	0	0	0	0	0	13	21	0	0	0	0	57.22	0	0	0	0	-1	0	0	0	0	0	0	0	0.00	368.50	86

rec_time	0	doors1	doors2	lockunlock	tpem	tmotor	tbattery	trip	odometer	speed	parktimer	ambient	doors3	staletemps	staleambient	vehicle12v	doors4	vehicle12v_ref	doors5	tcharger	vehicle12v_current
2019-03-13 17:44:08	0	192	0	5	11	0	12	0	434390	0	0	11	0	1	1	14.41	0	12.6	0	0	0	18

[TrystanLea]

Example code to request and parse data to json

<?php

$vehicleID = "";
$carpass = "";

$csv_str = file_get_contents("https://dexters-web.de/api/call?fn.name=ovms/export&fn.vehicleid=$vehicleID&fn.carpass=$carpass&fn.format=csv&fn.types=D,S&fn.last=1");
$csv_lines = explode("\n",$csv_str);

$headings1 = explode(",",$csv_lines[1]);
$data1 = explode(",",$csv_lines[2]);

$headings2 = explode(",",$csv_lines[4]);
$data2 = explode(",",$csv_lines[5]);

$data = array();

for ($i=0; $i<count($headings1); $i++) {
    if (is_numeric($data1[$i])) $data1[$i] *= 1;
    $data[$headings1[$i]] = $data1[$i];
}

for ($i=0; $i<count($headings2); $i++) {
    if (is_numeric($data2[$i])) $data2[$i] *= 1;
    $data[$headings2[$i]] = $data2[$i];
}

print json_encode($data,JSON_PRETTY_PRINT);

[glynhudson]

Implemented in 234b38d

[glynhudson]

[KommyKT]

I insatlled emoncms on rpi4 and now in daemondshaper get the following error:
EmonCMS Error

Message: Error: Syntax error, unrecognized expression: .input[name=batterycapacity
Route: Lib/jquery-1.11.3.min.js
Line: 2
Column: 12802
Error: {"line":2,"column":12757,"sourceURL":"http://192.168.1.253/Lib/jquery-1.11.3.min.js"}

How can i add batterycapacity input. i have a OVMS in my car. Now set dexters webpage for V2 server and Server v3 to rpy via mqtt on OVMS .