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solar_modbus_client.py
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from __future__ import print_function
from statistics import mean, StatisticsError
import maya
import time
import datetime
from aggregate import EnergyAggregator
from push_to_datastores import Announcement
from client import CHARGE_CONTROLLER, INFLUX_CLIENT, MQTT_CLIENT
DEBUG = False
SECONDS_BETWEEN_AVERAGES = 20
import paho.mqtt.client as mqtt
CHARGE_STATES = (
"START",
"NIGHT_CHECK",
"DISCONNECT",
"NIGHT",
"FAULT",
"MPPT",
"ABSORPTION",
"FLOAT",
"EQUALIZE",
"SLAVE"
)
class CurrentReader(object):
def __init__(self, high, low, bitdiv):
self.bitdiv = bitdiv
fractional = float(low) / float(2^16)
self.scale = float(high) + fractional
def __call__(self, reading):
return float(reading) * self.scale / self.bitdiv
class VoltageReader(object):
def __init__(self, high, low, bitdiv):
self.bitdiv = bitdiv
fractional = float(low) / float(2^16)
self.scale = float(high) + fractional
def __call__(self, reading):
return float(reading) * self.scale / self.bitdiv
################
announcement = Announcement("solar_controller_readings", INFLUX_CLIENT, MQTT_CLIENT, mqtt_topic_prefix="solar/")
# whours_announcement = Announcement("whours_today", INFLUX_CLIENT, MQTT_CLIENT, mqtt_topic_prefix="house/power/")
transmit_time = time.time()
previous_aggregate_time = datetime.datetime.utcnow()
next_aggregate_time = datetime.datetime.utcnow()
print("Will aggregate at %s" % next_aggregate_time)
next_charge_state_check_time = maya.now()
readings_since_problem = 0
while True:
before = time.time()
try:
result_reading = CHARGE_CONTROLLER.read_holding_registers(0, 68, unit=0x01)
try:
result_list = result_reading.registers
except AttributeError as e:
print("Got {} instead of a good reading (after {} good readings).".format(result_reading, readings_since_problem))
readings_since_problem = 0
continue
except Exception as e:
print("Encountered ({}) while reading (after {} good readings)".format(f, readings_since_problem))
readings_since_problem = 0
continue
else:
if DEBUG or readings_since_problem == 0:
print("Good reading: {}".format(result_list))
elif not readings_since_problem % 100:
print("{} consecutive good readings.".format(readings_since_problem))
readings_since_problem += 1
finally:
CHARGE_CONTROLLER.close()
after = time.time()
if DEBUG:
print("Took %s seconds to read charge controller" % (after - before))
## Voltages
voltage_reader = VoltageReader(high=result_list[0], low=result_list[1], bitdiv=32768)
battery_voltage_reading = float(result_list[24])
array_voltage_reading = float(result_list[27])
battery_voltage = voltage_reader(battery_voltage_reading)
array_voltage = voltage_reader(array_voltage_reading)
## Current
current_reader = CurrentReader(high=result_list[2], low=result_list[3], bitdiv=32768)
array_current = current_reader(result_list[29])
battery_current = current_reader(result_list[28])
amp_hours_today = result_list[67]
announcement.include_for_average("battery_voltage", battery_voltage)
announcement.include_for_average("array_voltage", array_voltage)
announcement.include_for_average("input_current", array_current)
announcement.include_for_average("output_current", battery_current)
if time.time() > transmit_time:
target_voltage = voltage_reader(result_list[51])
charge_state = CHARGE_STATES[result_list[50]]
announcement.include_as_definitive("target_voltage", round(target_voltage, 3))
announcement.include_as_definitive("charge_state", charge_state)
announcement.do_averages()
average_voltage = announcement.influx_payload['fields']['battery_voltage']
# Get yesterday's voltage at this time
v_response = INFLUX_CLIENT.query(
"select battery_voltage FROM solar_controller_readings WHERE time > {}s ORDER BY time ASC LIMIT 1".format(int(maya.when('yesterday').epoch)))
try:
_24h_ago_voltage = list(v_response.get_points())[0]['battery_voltage']
except IndexError:
# For whatever reason, we don't have voltage from 24 hours ago.
print("Voltage from 24 hours ago is unknown.")
else:
voltage_diff = round(average_voltage - _24h_ago_voltage, 3)
announcement.include_as_definitive("24h_voltage_change", voltage_diff)
announcement.transmit()
announcement = Announcement("solar_controller_readings", INFLUX_CLIENT, MQTT_CLIENT, mqtt_topic_prefix="solar/")
transmit_time = time.time() + SECONDS_BETWEEN_AVERAGES
# CHARGE_STATE
# See if it's charge_state time.
# TODO: Charge states are a shitshow.
# if maya.now() > next_charge_state_check_time:
#
# response = INFLUX_CLIENT.query(
# "select charge_state FROM charge_states ORDER BY time DESC LIMIT 1")
# points = response.get_points()
#
# try:
# previous_charge_state_dict = list(points)[0]
# previous_charge_state = previous_charge_state_dict['charge_state']
# except IndexError: # ie, we have no previous charge state.
# previous_charge_state = "UNKNOWN"
#
# if charge_state != previous_charge_state:
# INFLUX_CLIENT.write_points([{"measurement": "charge_states",
# "time": datetime.datetime.utcnow(),
# "fields": {"charge_state": charge_state}}])
# next_charge_state_check_time = maya.now().add(minutes=10)
now = datetime.datetime.utcnow()
if now > next_aggregate_time:
print("Time to aggregate!")
zero_out = charge_state == "FLOAT"
aggregator = EnergyAggregator()
yesterday = maya.when("yesterday").datetime(naive=True)
readings = aggregator.take_readings(begin=yesterday, end=now)
amp_averages = aggregator.get_amp_averages(readings=list(readings), begin=yesterday, end_minute=now)
previous_aggregate_time = next_aggregate_time
# Average voltage over last 24 hours.
v_response = INFLUX_CLIENT.query(
"select battery_voltage FROM solar_controller_readings WHERE time > {}s ORDER BY time ASC".format(
int(maya.when('yesterday').epoch)))
_24h_voltages = [r['battery_voltage'] for r in v_response.get_points()]
if len(_24h_voltages) > 50:
mean_voltage = mean(_24h_voltages)
min_voltage = min(_24h_voltages)
voltage_announcement = Announcement("voltage_24h_averages", INFLUX_CLIENT, MQTT_CLIENT,
mqtt_topic_prefix="solar/")
voltage_announcement.include_as_definitive("24h_average_voltage", round(mean_voltage, 3))
voltage_announcement.include_as_definitive("24h_min_voltage", round(min_voltage, 3))
voltage_announcement.transmit()
else:
print("Don't have enough values from yesterday to determine lookback mean or min.")
# Get the whours for each value.
# We take the average amps through the past 24 hours.
try:
penalty_whours_24 = amp_averages[0][1]['penalty']
shunt_1_whours_24h = amp_averages[0][1]['shunt_1']
shunt_2_whours_24h = amp_averages[0][1]['shunt_2']
shunt_3_whours_24h = amp_averages[0][1]['shunt_3']
whours_announcement = Announcement("shunt_readings_24h_average", INFLUX_CLIENT, MQTT_CLIENT,
mqtt_topic_prefix="energy/")
whours_announcement.include_as_definitive("24h_penalty_whours", round(penalty_whours_24, 3))
whours_announcement.include_as_definitive("24h_shunt1_whours", round(shunt_1_whours_24h, 3))
whours_announcement.include_as_definitive("24h_shunt2_whours", round(shunt_2_whours_24h, 3))
whours_announcement.include_as_definitive("24h_shunt3_whours", round(shunt_3_whours_24h, 3))
whours_announcement.transmit()
except IndexError:
print("Not enough data from 24 hours to do whours lookback.")
# Here we used to aggregate whours since last float. This has proven not to be terribly useful.
# next_aggregate_time = aggregator.go(next_aggregate_time, zero_out=zero_out)
next_aggregate_time = now + datetime.timedelta(minutes=1)
print("Done with aggregation. Will do it again at {}".format(next_aggregate_time))