Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- howto:wechselrichter_sma [2014/05/29 11:18] – wf_bitplan.com
+++ howto:wechselrichter_sma [2018/01/25 16:04] – code jau
@@ Zeile 48: / Zeile 48: @@
 </code>
-=== Beispiele ===
+==== Beispiel STP 9000 TL-20 mit SMASpot per Ethernet / Perl->Middleware ====
-== Beispiel STP 9000 TL-20 mit SMASpot per Ethernet / Perl->Middleware ==
@@ Zeile 63: / Zeile 62: @@
 Anbei das Script:
-<code>
+<code perl sma.pl>
 #!/usr/bin/perl
 use LWP::UserAgent;
@@ Zeile 126: / Zeile 125: @@
 </code>
 Um den Eigenverbrauch zu bestimmen bilde ich die Differenz zwischen der Einspeisung, gemessen am Stromzähler. ( mit vzlogger) und der erzeugten Strommenge des SMA. Da der SMA immer etwas verzögert die Werte anzeigt, lege ich nur einen Messpunkt alle 15 Minuten ab: Die Kanäle sind zuvor in der Weboberfläche anzulegen, und mit mysql die channel_id zu selektieren.
+Änderung 04.06.2014: Die Berechnung des Gesamtverbrauchs ist aktualisiert.
-<code bash|Berechnung Eigenverbrauch mit mysql>
+== Originalscript von Markus ==
+<code bash eigenverbrauch.sh>
 #!/bin/bash
 echo '
@@ Zeile 150: / Zeile 151: @@
 echo '
-INSERT INTO `data`( `channel_id`, `timestamp`, `value`) select 8,  timestamp_7,   data_7.value + data_1.value/1000     from (
+INSERT INTO `data`( `channel_id`, `timestamp`, `value`) select 8,  timestamp_1,   (select data.value from data where channel_id = 7 and  data.timestamp <= data_1.timestamp order by timestamp desc limit 1) + data_1.value/1000     from
+(
 SELECT
 max(case when `channel_id`  = 1 then timestamp else 0 end) timestamp_1,
 max(case when `channel_id`  = 7 then timestamp else 0 end) timestamp_7
   FROM `data` where channel_id in (1,7)
-group by floor(`timestamp`/60/1000/15) ) a inner join data data_7 on  timestamp_7  = data_7.timestamp and data_7.channel_id = 7
+group by floor(`timestamp`/60/1000/15)
-inner join data data_1 on  timestamp_1  = data_1.timestamp and data_1.channel_id = 1
+) a inner join data data_1 on  timestamp_1  = data_1.timestamp and data_1.channel_id = 1
-' | mysql --user=vz --password=fdfdfdfdf volkszaehler
+' | mysql --user=vz --password=dsdsdsdsds volkszaehler
 </code>
 auch diese Script wird mit cron gestartet, aber nur ein mal die Stunde.
 <code>
-  * * * *    bash /home/markus/hack/Volksz/eigenverbrauch.bash
+  * * * *    bash /home/markus/hack/Volksz/eigenverbrauch.sh
 </code>
+== Modifiziertes Script (Versuch von Wolfgang) ==
+<code bash eigenverbrauch.sh>
+#!/bin/bash
+# calculate own PV usage
+# Author: Markus 2014-05-20
+# latest version:
+# $Header: /home/wf/smaspot/RCS/eigenverbrauch.bash,v 1.5 2014/05/29 10:17:11 wf Exp wf $
+#
+# get the delete query for the given channel
+#
+deletequery() {
+  local l_channel=$1
+cat << EOF
+  DELETE
+   FROM `data`
+   WHERE `timestamp` =
+     (SELECT MAX(timestamp) FROM data WHERE channel_id = $l_channel)
+   AND channel_id = $l_channel;
+EOF
+}
+#
+# get the insert query for the given channels
+#  l_chanel the channel to insert into
+#    l_c2 - the channel to substract
+#    l_c3 - the channel to substract the value from
+#
+insertquery() {
+  local l_channel=$1
+  local l_c2=$2
+  local l_c3=$3
+cat << EOF
+  INSERT INTO `data`( `channel_id`, `timestamp`, `value`)
+    SELECT $l_chanel,  timestamp_2,   data_3.value - data_2.value /1000
+    FROM (
+      SELECT
+        MAX(CASE WHEN `channel_id` = $l_c2 then timestamp else 0 end) timestamp_2,
+        MAX(CASE WHEN `channel_id` = $l_c3 then timestamp else 0 end) timestamp_3
+        FROM `data`
+        WHERE channel_id in ($l_c2,$l_c3)
+          AND timestamp > (
+            SELECT MAX(timestamp) FROM data WHERE `channel_id` = $l_channel
+          )
+        GROUP by floor(`timestamp`/60/1000/15) ) a
+        INNER JOIN data data_2
+          ON  timestamp_2  = data_2.timestamp
+          AND data_2.channel_id = $l_c2
+        INNER JOIN data data_3
+          ON  timestamp_3  = data_3.timestamp
+          AND data_3.channel_id = $l_c3
+EOF
+}
+# modify according to your volkszaehler mysql database settings
+user=vz
+password=fdfdfdfdf
+db=volkszaehler
+# debug setting
+debug=
+# uncomment to debug sql
+#debug=-T
+# modify to suite your channel settings
+# channel 7 is calculated from as channel 4 - channel 2 / 1000
+deletequery 7     | egrep -v "^#" | mysql --user=$user --password=$password $db $debug
+insertquery 7 2 4 | egrep -v "^#" | mysql --user=$user --password=$password $db $debug
+# channel 8 is calculated from as channel 7 - channel 1 / 1000
+echo "DELETE FROM `data` WHERE channel_id = 8" |  mysql --user=$user --password=$password $db $debug
+insertquery 8 1 7 | egrep -v "^#" | mysql --user=$user --password=$password $db $debug
+</code>
 Und so sieht es aus:
 {{:howto:screenshotsma.jpg?800|}}
-== Beispiel SB 4000 TL-21 + SB 1300TL-10 mit SMASpot und PHP ==
+==== Beispiel SB 4000 TL-21 + SB 1300TL-10 mit SMASpot und PHP ====
+The solution consists of three parts:
+  - the bash script sma2vz
+  - the php script sma2vz.php
+  - the php helper script vzapihelper.php (same as in the youless page)
+the bash script sma2vz has a function configure - this needs to run once you might want
+to configure the here-document part in the function inverters of this script
+there is a help screen available:
+<code bash sma2vz>
+./sma2vz --help
+   usage: ./sma2vz --vzurl=vzurl --cuuid_pwr=x --cuuid_kwh=y
+     [ --daytimeonly --lat=lattitude --lon=longitude]
+     [--loop --delay=delay]
+    | [--help]
+    | [--configure]
+     --vzurl=<url>
+        volkszaehler middleware url
+     --cuuid_pwr=<uuid>
+        channel uuid for power (watt) PV output
+     --cuuid_kwh=<uuid>
+       channel uuid for energy (kwH) PV total
+     --daytimeonly
+       do not post data at night (e.g. if your device does not supply data)
+     --lon=<longitude>
+       plant longitude geo coordinate
+     --lat=<lattitude>
+       plant lattitude geo coordinate
+     --loop
+       poll SMA inverters in a loop
+     --delay=<secs>
+       how many secs to wait between each reading (default: 15 secs)
+     --configure
+       create SMAsport configuration file(s)
+         modify ./sma2vz inverters shell function
+         here document to fit your plant's data
+</code>
+<code bash configure example>
+./sma2vz --lat 51.244 --lon 6.52 --configure
+</code>
+<code bash loop example>
+./sma2vz \
+  --vzurl "http://capri/vz/middleware.php/data" \
+  --cuuid_pwr "7744bbf0-e74d-11e3-9ec7-xxxx" \
+  --cuuid_kwh "460feba0-e74f-11e3-8a0d-xxxx" \
+  --daytimeonly --lat 51.244 --lon 6.52 \
+  --loop --delay 15
+</code>
+<code bash cron example>
+cd /home/wf/smaspot
+/home/wf/smaspot/sma2vz \
+  --vzurl "http://capri/vz/middleware.php/data" \
+  --cuuid_pwr "7744bbf0-e74d-11e3-9ec7-xxxx" \
+  --cuuid_kwh "460feba0-e74f-11e3-8a0d-xxxx" \
+  --daytimeonly --lat 51.244 --lon 6.52 >> /var/log/energymeter.log
+</code>
+<code | logoutput example>
+-06-01 12:52:08 PV:  1409 Watt   6699.801 kwH sun rise:05:21 set:21:42
+-06-01 12:53:07 PV:  2176 Watt   6699.826 kwH sun rise:05:21 set:21:42
+-06-01 12:54:07 PV:  1699 Watt   6699.855 kwH sun rise:05:21 set:21:42
+-06-01 12:55:07 PV:  3375 Watt   6699.898 kwH sun rise:05:21 set:21:42
+-06-01 12:56:07 PV:  3578 Watt   6699.957 kwH sun rise:05:21 set:21:42
+</code>
+Any feedback please to wf (at) bitplan.com - enjoy!
+<code bash sma2vz>
+#/bin/bash
+# SMAspot with Volkszaehler
+# WF 2014-05-29
+# $Header: /home/wf/smaspot/RCS/sma2vz,v 1.8 2014/06/01 10:49:38 wf Exp wf $
+#
+# get a configuration
+#  param 1: bluetooth address
+#  param 2: name of configuration/plant
+#  param 3: "USER" password for SMA device
+#  param 4: latitude of plant
+#  param 5: longitude of plant
+#  param 6: path to output files of SMAspot
+#
+smaspot_config() {
+ local l_btaddr=$1
+ local l_name=$2
+ local l_password=$3
+ local l_lon=$4
+ local l_lat=$5
+ local l_path=$6
+cat << EOF
+################################################################################
+#                ____  __  __    _                    _
+#               / ___||  \/  |  / \   ___ _ __   ___ | |_
+#               \___ \| |\/| | / _ \ / __| '_ \ / _ \| __|
+#                ___) | |  | |/ ___ \\__ \ |_) | (_) | |_
+#               |____/|_|  |_/_/   \_\___/ .__/ \___/ \__|
+#                                        |_|
+#
+#  SMAspot.cfg - Configuration file for SMAspot.exe
+#  SMAspot - Yet another tool to read power production of SMA solar inverters
+#  (c)2012-2014, SBF
+#
+#  DISCLAIMER:
+#  A user of SMAspot software acknowledges that he or she is receiving this
+#  software on an "as is" basis and the user is not relying on the accuracy
+#  or functionality of the software for any purpose. The user further
+#  acknowledges that any use of this software will be at his own risk
+#  and the copyright owner accepts no responsibility whatsoever arising from
+#  the use or application of the software.
+#
+################################################################################
+# SMA Inverter's Bluetooth address
+# Windows: smaspot -scan
+# Linux  : hcitool scan
+# IMPORTANT FOR SPEEDWIRE USERS: COMMENT OUT BTADDRESS (PUT # IN FRONT)
+BTAddress=$l_btaddr
+# SMA Inverter's Speedwire IP address
+# If IP_Address is not set or is 0.0.0.0 SMAspot will try to detect the speedwire inverter by broadcast
+# If IP_Address is set to a valid IP, SMAspot will try to connect directly to that IP without broadcast detection
+#IP_Address=0.0.0.0
+# User password (default 0000)
+Password=$l_password
+# MIS_Enabled (Multi Inverter Support: Default=0 Disabled)
+# +------------+-------+-------------+
+# | #Inverters | NetID | MIS_Enabled |
+# +------------+-------+-------------+
+# |      1     |   1   | Don't Care  |
+# +------------+-------+-------------+
+# |      1     |   >1  |      0      |
+# +------------+-------+-------------+
+# |      >1    |   >1  |      1      |
+# +------------+-------+-------------+
+MIS_Enabled=0
+# Plantname
+Plantname=$l_name
+# OutputPath (Place to store CSV files)
+#
+# Windows: C:\TEMP\SMA\%Y
+# Linux  : /home/sbf/Documents/sma/%Y
+# %Y %m and %d will be expanded to Year Month and Day
+OutputPath=$l_path/%Y
+# OutputPathEvents (Place to store CSV files for events)
+# If omitted, OutputPath is used
+OutputPathEvents=$l_path/Events
+# Position of pv-plant http://itouchmap.com/latlong.html
+# Example for Ukkel, Belgium
+Latitude=$l_lat
+Longitude=$l_lon
+# Calculate Missing SpotValues
+# If set to 1, values not provided by inverter will be calculated
+# eg: Pdc1 = Idc1 * Udc1
+CalculateMissingSpotValues=1
+# DateTimeFormat (default %d/%m/%Y %H:%M:%S)
+# For details see strftime() function
+# http://www.cplusplus.com/reference/clibrary/ctime/strftime/
+DateTimeFormat=%Y-%m-%d %H:%M:%S
+# DateFormat (default %d/%m/%Y)
+DateFormat=%-%m-%d
+# DecimalPoint (comma/point default comma)
+DecimalPoint=point
+# TimeFormat (default %H:%M:%S)
+TimeFormat=%H:%M:%S
+# SynchTime (default 1 = On)
+# If set to 1 the Inverter time is synchronised with pc time
+# Some inverters don't have a real-time clock
+SynchTime=1
+# SunRSOffset
+# Offset to start before sunrise and end after sunset (0-3600 - default 900 seconds)
+SunRSOffset=900
+# Locale
+# Translate Entries in CSV files
+# Surpported locales: de-DE;en-US;fr-FR;nl-NL;es-ES;it-IT
+# Default en-US
+Locale=de-DE
+# Timezone
+# Select the right timezone in date_time_zonespec.csv
+# e.g. Timezone=Europe/Brussels
+Timezone=Europe/Berlin
+###########################
+### CSV Export Settings ###
+###########################
+# With CSV_* settings you can define the CSV file format
+# CSV_Export (default 1 = Enabled)
+# Enables or disables the CSV Export functionality
+CSV_Export=1
+# CSV_ExtendedHeader (default 1 = On)
+# Enables or disables the SMA extended header info (8 lines)
+# isep=;
+# Version CSV1|Tool SMAspot|Linebreaks CR/LF|Delimiter semicolon|Decimalpoint comma|Precision 3
+# etc...
+# This is usefull for manual data upload to pvoutput.org
+CSV_ExtendedHeader=1
+# CSV_Header (default 1 = On)
+# Enables or disables the CSV data header info (1 line)
+# dd/MM/yyyy HH:mm:ss;kWh;kW
+# This is usefull for manual data upload to pvoutput.org
+# If CSV_ExtendedHeader is enabled, CSV_Header is also enabled
+CSV_Header=1
+# CSV_SaveZeroPower (default 1 = On)
+# When enabled, daily csv files contain all data from 00:00 to 23:55
+# This is usefull for manual data upload to pvoutput.org
+CSV_SaveZeroPower=1
+# CSV_Delimiter (comma/semicolon default semicolon)
+CSV_Delimiter=semicolon
+# CSV_Spot_TimeSource (Inverter|Computer default Inverter)
+CSV_Spot_TimeSource=Inverter
+# CSV_Spot_WebboxHeader (Default 0 = Off)
+# When enabled, use Webbox style header (DcMs.Watt[A];DcMs.Watt[B]...)
+CSV_Spot_WebboxHeader=0
+#################################
+### Online Monitoring Systems ###
+#################################
+#
+# In the future, multiple online monitoring systems can be defined
+# Here we can activate the ones we like
+#
+################################
+### PVoutput Upload Settings ###
+################################
+# PVoutput (default 0 = Disabled)
+# Enables or disables the upload functionality to pvoutput.org
+# When enabled, be sure to use -u switch on the command line
+PVoutput=0
+#PVoutput_SID
+#Sets PVoutput System ID
+PVoutput_SID=
+#PVoutput_Key
+#Sets PVoutput API Key
+PVoutput_Key=
+# VoltageLogging sets AC or DC logging.
+# Possible values are:
+# NONE (disabled)
+# MAX(AC) (default)
+# AC(PH1) or AC(PH2) or AC(PH3)
+# MAX(DC) or DC(ST1) or DC(ST2)
+VoltLogging=MAX(AC)
+# InverterTemp (default 0 = disabled)
+# Enables or disables the upload of the inverter's temperature
+InverterTemp=0
+# InverterTempMapTo (default v5 = Use standard PVoutput Temperature Graph)
+# In Donation Mode only, map inverter's temperature to extended data field (v7..v12)
+# For more info, see http://pvoutput.org/help.html#donations
+InverterTempMapTo=v5
+# CumulativeEnergy (default 0 = Today's Energy)
+# Set the cumulative flag = 1 when you wish to pass lifetime energy or 0 for today's energy
+# WARNING!!! DO NOT CHANGE THIS FLAG DURING DAYLIGHT AS THIS WILL MESS UP YOUR PVOUTPUT GRAPHS
+CumulativeEnergy=0
+EOF
+}
+#
+#inverters
+#
+inverters() {
+# insert your data from
+#   hcitool scan | grep SMA
+#
+# first  column is bluetooth address
+# second column is the name of the device (here just the wattage is used)
+# third  column is the password for "USER" that the SMA Device expects
+# fourth column is the latitude
+# fifth  column is the longitude
+cat << EOF
+:80:25:24:xx:xy 1300Watt password /home/wf/smaspot
+:80:25:29:xx:xy 4000Watt password /home/wf/smaspot
+EOF
+}
+#
+# create configuration files
+#
+configure() {
+  checklonlat "configure"
+inverters | while read btaddr name password path; do
+  echo "creating ${name}.cfg for bluetooth addr $btaddr" 1>&2
+  smaspot_config $btaddr $name $password $lon $lat $path > ${name}.cfg
+done
+}
+#
+# get the sma meter reading
+#
+getsmameter() {
+  # temp filename base for SMAspor result
+  tmp=/tmp/smaspot$$
+  # read data from all inverters
+  inverters | while read btaddr name password path; do
+    # single shot run of SMAspot with no CVS export
+    # uncomment to debug
+    #echo "running smaspot with ${name}.cfg for bluetooth addr $btaddr"
+    ./SMAspot -v -nocsv -cfg${name}.cfg > ${tmp}_${name}
+    # the lines we need look like:
+    #  EToday: 3.358kWh
+	  #  ETotal: 5151.294kWh
+    #  Total Pac   :   0.442kW
+    # let's filter the result with awk
+    cat ${tmp}_${name} | awk '
+# set the field separator fitting the x: y format
+BEGIN        { FS=":";doublequote="\x22" }
+# check the input lines for the three patterns and remove
+# the unit at the end - assign to the three variables
+# etoday, etotal and totalpac
+/EToday:/    { etoday  =$2;gsub("kWh","",etoday)   }
+/ETotal:/    { etotal  =$2;gsub("kWh","",etotal)   }
+/Total Pac/  { totalpac=$2;gsub("kW" ,"",totalpac) }
+# at the end of all lines print out a single json formatted result line
+END          {
+                printf("{%s,%s,%s}\n",
+                  json("etoday",etoday),
+                  json("etotal",etotal),
+                  json("totalpac",totalpac))
+             }
+# helper function to create json name values
+function json(name,value,result) {
+  # trim value
+  gsub(" ","",value);
+  result=quote(name)":"quote(value);
+  return result
+}
+# helper function to quote a string
+function quote(s,result) {
+  result=doublequote s doublequote;
+  return result
+}'
+  rm ${tmp}_${name}
+done
+}
+#
+# show usage
+#
+usage() {
+cat << EOF
+   usage: $0 --vzurl=vzurl --cuuid_pwr=x --cuuid_kwh=y
+     [ --daytimeonly --lat=lattitude --lon=longitude]
+     [--loop --delay=delay]
+    | [--help]
+    | [--configure]
+     --vzurl=<url>
+        volkszaehler middleware url
+     --cuuid_pwr=<uuid>
+        channel uuid for power (watt) PV output
+     --cuuid_kwh=<uuid>
+       channel uuid for energy (kwH) PV total
+     --daytimeonly
+       do not post data at night (e.g. if your device does not supply data)
+     --lon=<longitude>
+       plant longitude geo coordinate
+     --lat=<lattitude>
+       plant lattitude geo coordinate
+     --loop
+       poll SMA inverters in a loop
+     --delay=<secs>
+       how many secs to wait between each reading (default: 15 secs)
+     --configure
+       create SMAsport configuration file(s)
+         modify $0 inverters shell function
+         here document to fit your plant's data
+EOF
+  exit 1
+}
+#
+# show error and exit
+#
+error() {
+  local l_msg=$1
+  local l_hint=$2
+  echo "error $0: $l_msg" 1>&2
+  echo "  you might want to $l_hint !" 1>&2
+  exit 1
+}
+#
+# check that longitude and lattitude are supplied
+#
+checklonlat() {
+  local l_title="$1"
+  if [ "$lon" == "" ]
+  then
+    error "option --lon" "supply lon longitude setting for $l_title to work"
+  fi
+  if [ "$lat" == "" ]
+  then
+    error "option --lat" "supply lat lattitude setting for $l_title to work"
+  fi
+}
+# defaults
+delay=15
+maxloops=1
+daytimeonly=0
+# check command line arguments
+while [ $# -gt 0 ]
+do
+  arg="$1"
+  #echo "$arg"
+  case "$arg" in
+     --help)
+       usage
+       ;;
+     --vzurl)
+       vzurl="$2"
+       shift
+       ;;
+     --cuuid_pwr)
+       cuuid_pwr="$2"
+       shift
+       ;;
+     --cuuid_kwh)
+       cuuid_kwh="$2"
+       #echo $cuuid_kwh
+       shift
+       ;;
+     --daytimeonly)
+       daytimeonly=1;
+       ;;
+     --lat)
+       lat="$2"
+       shift
+       ;;
+     --lon)
+       lon="$2"
+       shift
+       ;;
+     --delay)
+       delay=$2
+       shift
+       ;;
+     --loop)
+       maxloops=10000000;
+       ;;
+     --configure)
+       echo "creating configuration files"
+       configure
+       exit
+       ;;
+     *)
+       echo >&2 "Invalid argument: $1"
+       exit 1
+     ;;
+   esac
+   shift
+done
+# check that options are set
+if [ "$vzurl" == "" ]
+then
+  error "option --vzurl is missing" "check and use volkszaehler middleware url"
+fi
+if [ "${cuuid_pwr}" == "" ]
+then
+  error "option --cuuid_pwr is missing" "check the uuid for the PV power (Watt) channel"
+fi
+if [ "$cuuid_kwh" == "" ]
+then
+  error "option --cuuid_kwh" "check the uuid for the PV energy (kwH) channel"
+fi
+if [ "$daytimeonly" -eq 1 ]
+then
+  checklonlat "daytimeonly"
+fi
+loop=0
+while [ $loop -lt $maxloops ]
+do
+  # get the SMA meter readings
+  getsmameter | php sma2vz.php --vzurl=$vzurl --cuuid_pwr=$cuuid_pwr --cuuid_kwh=$cuuid_kwh --daytimeonly=$daytimeonly --lat=$lat --lon=$lon
+  # sleep a while
+  if [ $maxloops -gt 1 ]
+  then
+    sleep $delay
+  fi
+  loop=`expr $loop + 1 `
+done
+</code>
+<code php sma2vz.php>
+<?php
+  /**
+   * read meter data from SMA device
+   * and post it to volkszaehler
+   * $Header: /home/wf/smaspot/RCS/sma2vz.php,v 1.6 2014/06/01 10:40:27 wf Exp wf $
+   */
+// common code for reading and posting
+require __DIR__.'/vzapihelper.php';
+  /**
+   * check the daytime values
+   */
+  function daytime($latitude,$longitude) {
+    $result=array();
+    // 08:53 CEST
+    // $time_format = 'H:i T';
+    // 08:53
+    $time_format = 'H:i';
+    // find time offset in hours
+    $tzoffset = date("Z")/60 / 60;
+    $zenith = 90+(50/60); // True sunrise/sunset
+    // determine sunrise time
+    $sunrise = date_sunrise(time(), SUNFUNCS_RET_STRING, $latitude, $longitude, $zenith, $tzoffset);
+    $sunrise_time = date($time_format, strtotime(date("Y-m-d") . ' '. $sunrise));
+    // determine sunset time
+    $sunset = date_sunset(time(), SUNFUNCS_RET_STRING, $latitude, $longitude, $zenith, $tzoffset);
+    $sunset_time = date($time_format, strtotime(date("Y-m-d") . ' '. $sunset));
+    // check whether it's daytime
+    $sunrise_epoch = date_sunrise(time(), SUNFUNCS_RET_TIMESTAMP, $latitude, $longitude, $zenith, $tzoffset);
+    $sunset_epoch  = date_sunset(time(), SUNFUNCS_RET_TIMESTAMP, $latitude, $longitude, $zenith, $tzoffset);
+    $time_epoch = time(); // time now
+    $result["daytime"]=($time_epoch < $sunset_epoch and $time_epoch > $sunrise_epoch);
+    $result["rise"] = $sunrise_time;
+    $result["set"] = $sunset_time;
+    $result["time"] = date("Y-m-d H:i:s",time());
+    return $result;
+  }
+  $loop=0;
+  // possible command line options
+  // --vzurl= --cuuid_pwr= --cuuid_kwh= --daytimeonly
+  $longopts=array("vzurl:","cuuid_pwr:","cuuid_kwh:","lat:","lon:","daytimeonly:");
+  $shortopts="";
+  $options=getopt($shortopts,$longopts);
+  // the volkszaehler middleware url
+  $vzurl=checkoption("vzurl",$options);
+  // channel uuids
+  // power (watts)
+  $cuuid_pwr=checkoption("cuuid_pwr",$options);
+  // energy (kWh)
+  $cuuid_kwh=checkoption("cuuid_kwh",$options);
+  // daytimeonly?
+  $daytimeonly=checkoption("daytimeonly",$options);
+  if ($daytimeonly) {
+    $latitude=checkoption("lat",$options);
+    $longitude=checkoption("lon",$options);
+  }
+  $jsonlines=file("php://stdin");
+  $tmeter=array();
+  foreach ($jsonlines as $line_nume => $json) {
+    // get the meter reading
+    $meter=json_decode($json, true);
+    #var_dump($meter);
+    foreach ($meter as $name => $value) {
+      if (!array_key_exists($name,$tmeter))
+        $tmeter[$name]=0;
+      $tmeter[$name]+=$value;
+    }
+  }
+  #var_dump($tmeter);
+  //array(3) { ["etoday"]=> float(2.52)
+  // ["etotal"]=> float(6632.462)
+  //["totalpac"]=> float(2.478) }
+  $etotal=$tmeter["etotal"];
+  $totalpac=$tmeter["totalpac"]*1000;
+  if ($daytimeonly) {
+    $daytime=daytime($latitude,$longitude);
+    if (!$daytime["daytime"]) {
+      printf("%s after sunset: %s wait for sunrise: %s\n",$daytime["time"],$daytime["set"],$daytime["rise"]);
+      exit(2);
+    }
+  }
+  # total wattage of all inverters
+  post2vz($vzurl,$cuuid_pwr,$totalpac);
+  # total kwh of all inverters
+  post2vz($vzurl,$cuuid_kwh,$etotal);
+  if ($daytimeonly) {
+    printf("%s PV: % 5d Watt % 10.3f kwH sun rise:%s set:%s\n",$daytime["time"],$totalpac,$etotal,$daytime["rise"],$daytime["set"]);
+  } else {
+    printf("PV Current/Total: %4.0f Watt %.3f kwH\n",$totalpac,$etotal);
+  }
+  exit(0);
+?>
+</code>
+<code php vzapihelper.php>
+<?php
+  /**
+   * vzapi helper functions
+   * $Header: /home/wf/youless/RCS/vzapihelper.php,v 1.3 2014/05/30 06:57:23 wf Exp $
+   */
+  /**
+   * get a curl channel
+   */
+  function curl($url) {
+    //  Initiate curl
+    $ch = curl_init();
+    // Disable SSL verification
+    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
+    // Will return the response, if false it print the response
+    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+    // Set the url
+    curl_setopt($ch, CURLOPT_URL,$url);
+    return $ch;
+  }
+  /**
+   * read the given url
+   * @param $url:the url to read from
+   */
+  function readUrl($url)  {
+    $ch=curl($url);
+    // Execute
+    $result=curl_exec($ch);
+    return $result;
+  }
+  /**
+   * post to the given url
+   */
+  function postUrl($url,$fields) {
+     $ch=curl($url);
+     $fields_string="";
+     //url-ify the data for the POST
+    foreach($fields as $key=>$value) {
+      $fields_string .= $key.'='.$value.'&';
+    }
+    rtrim($fields_string, '&');
+    curl_setopt($ch,CURLOPT_POST, count($fields));
+    curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
+    $result=curl_exec($ch);
+    return $result;
+   }
+   /**
+    * post data to vz middleware
+    *   param 1: vzurl - middleware url of volkszaehler
+    *   param 2: channel uuid
+    *   param 3: value to post
+    */
+   function post2vz($vzurl,$cuuid,$value,$debug=false) {
+     // post data to middleware according to:
+     // http://wiki.volkszaehler.org/development/api/reference
+     // adapt timestamp to volkszaehler conventions
+		 $timestamp=time()*1000;
+     # first
+     $posturl=$vzurl."/".$cuuid.".json";
+     $fields=array("ts"=>$timestamp,"value" => $value );
+     $presult=postUrl($posturl,$fields);
+     if ($debug) {
+       echo $presult;
+     }
+   }
+  /**
+   * check that option $opt is available in $options
+   * return the value if available
+   */
+  function checkoption($opt,$options) {
+    if (array_key_exists($opt,$options))
+      return $options[$opt];
+    else
+      die("option $opt missing!\n");
+  }
+?>
+</code>