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solar 8 w voltage: 13.8 v current: 0.6 a peak today: 8 w load 10 w inverter: on (idle) current: 0.8 a peak today: 117 w battery voltage: 12.48 v discharging at 0.1 a 50% generated this week: 0.56 kwh generated last week: 0.02 kwh used this week: 0.7 kwh used last week: 0.02 kwh more ▼ datalogger started: 8th april 2016 generated overall: 156.28 kwh software uptime: 4 hours, 30 minutes, 2 seconds consumed overall: 124.08 kwh raspberry pi uptime: 4 hours, 30 minutes, 7 seconds peak solar power: 431 w total data readings: 2,203,394 peak load power: 199 w last updated 07:30:21 graph: now (live) past 24 hours past week past month may april march february january december november october september august july june may april now 07:00 06:00 05:00 04:00 03:00 21:00 20:00 19:00 18:00 summary this project started some time ago when i became interested in renewable energy and built a wind turbine, and since then has evolved into a self-sufficient solar energy system, reporting real energy data to the internet using a raspberry pi. the generator inside the 24 foot wind turbine itself was frequently problematic and so it is not currently generating. instead, the system is currently comprised of 400 watts of solar power, which charge 2 x 110 amp-hour batteries during the day. these power the entire led lighting fixtures inside the house 24 / 7. although the system is relatively low power, the project as a whole has been a fantastic learning opportunity, and i hope that anyone fascinated by do-it-yourself renewable energy systems find the details here of great interest. my long term plan is to acquire at least 1kw of solar panels, and perhaps have the excess energy redirected to an immersion heater when the batteries are charged. you'll find that almost everything was acquired on ebay, and where possible i have included a price and a link to each piece of equipment required, as well as any useful web resources and source codes. tweets by @sunpoweredhome generating power at present, the system is powered by 4 x 100w monocrystalline solar panels. they are wired in pairs to achieve 40 volts at 10 amps (peak). the panels are located on the the garage roof, bolted into brackets in a way that allows them to pivot. they are currently raised approximately 40 degrees which is a suitable angle for both the winter and summer months. 4 x 100w monocrystalline solar panels: £320 link charging batteries from the solar panels, the cable arrives at a board on which all of the electrical equipment is mounted. a 20 amp rotary switch seperates the solar panel from the charge controller and is used to cut the power whenever maintenance is required. after experimenting with some of the cheaper charge controllers and project kits, i eventually decided that i should invest in something a bit more fancy if i wanted to preserve the health of the batteries and have a reliable system. i discovered the mppt tracer charge controllers by epsolar , an affordable but fantastic product that suited my requirements and more. i was specifically excited to learn that these charge controllers have a communication port , which has made the real-time data monitoring aspect much easier than first envisaged. more information on this can be found below. the battery bank currently consists of 2 x 12v 110ah lead acid leisure batteries wired in parallel. the charge controller uses an mppt charging algorithm to track to best power point of the solar panels. during the bulk charge phase (when the sun comes up and the batteries are low) the charge controller converts the 40 volts from the solar panels into as many amps as possible. once the batteries have reached the configured voltage of 14.4, they remain at this voltage (the constant charge phase) and draw less current as they become more charged. when the charge controller reaches its float charging phase, the batteries are kept at 13.8 volts until the sun goes down. after some research, i learned that it was advisable not to let the batteries fall below a 50% state of charge. in light of this, the controller has been set to cut power to the inverter once the batteries reach 12.1v. 2 x 110ah lead acid leisure batteries: £140 link tracer2210a charge controller: £70 link using the power connected to the load output of the charge controller is a 300w pure sine wave inverter, which converts the 12v dc from the batteries into 230v ac. from this the power goes onto a 4-way socket. inbetween the inverter and the 4 sockets is a backup relay which switches the sockets to mains power should the inverter ever fail or the batteries run flat. this is a simple dpdt 230v relay that i wired according to a simple guide at reuk. plugged into one of the 4 sockets is a cable that goes back towards the house, into the roof, and to the lighting circuit for the entire house. the backup relay ensures the sockets are always live, so the lights in the house never go out! in order to be able to power all of the lights from just a 300w inverter, all the bulbs, 28 in total, have been replaced with low power leds. this reduced the overall power required to light the house from 1.3kw to just 115w, a 91% reduction! mercury 300w pure sine wave inverter: £70 link 28 x led ses, es, gu10 bulbs: £40 link 230v dpdt relay and enclosure: £9 link getting real-time data fitted inside an enclosure is a raspberry pi model b (the credit card sized computer) running linux ( raspbian jessie lite 4.4 ). it is powered by the batteries with a 12-5v usb adapter and has internet access via an ethernet cable coming from the router in the house. there's no screen or keyboard attached to the raspberry pi, but instead it is accessed over the network via ssh, with a client such as putty . i am also able to access it from outside of the network using a dynamic dns service. these are easy to set up providing you have a router that supports one of these services. remote ssh access is useful, because it means i can reboot or make changes to the datalogging program from any location. the epsolar tracer2210a charge controller (including their bn range) has an rj45 port which can be used to connect an optional monitor, or to windows monitoring software. i was able to make the raspberry pi communicate with the charge controller using the pymodbus library and a cheap usb to rs485 adapter. i used one of these usb to rs485 adapters. after cutting the end from an old ethernet cable, i attached the blue and blue-white wires to the adapter (rj45 pins 4 and 5). the program i have written ( source ) continually requests data from the charge controller (solar voltage, solar current, battery voltage, charge current) and posts them to a web address using the urllib2 library. the php webpage, hosted on my web server ( source ) checks the data, calculates the power being generated/consumed in watts, and inserts it into a mysql database. this is repeated around the clock approximately 8 times per minute. the minimal amount of code needed for retrieving data from a tracer charge controller can be seen below. please see the modbus protocol for a full list of registers. from pymodbus.client.sync import modbusserialclient as modbusclient client = modbusclient(method = 'rtu', port = '/dev/ttyusb0', baudrate = 115200) client.connect() result = client.read_input_registers(0x3100,6,unit=1) solarvoltage = float(result.registers[0] / 100.0) solarcurrent = float(result.registers[1] / 100.0) batteryvoltage = float(result.registers[4] / 100.0) chargecurrent = float(result.registers[5] / 100.0) # do something with the data client.close() as well as requesting data from the charge controller, my raspberry pi senses the load current manually using a 30 amp current sensor and an adc (analog to digital converter). this was necessary because the load current data given by the charge controller itself was very eratic, which made it difficult to calculate power accurately. i can only assume this is because the tracer was not designed to power a pure sinewa

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Whois Information

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Domain name:
solarpoweredhome.co.uk

Data validation:
Nominet was able to match the registrant's name and address against a 3rd party data source on 06-May-2016

Registrar:
Fasthosts Internet Ltd [Tag = LIVEDOMAINS]
URL: http://www.fasthosts.co.uk

Relevant dates:
Registered on: 17-Apr-2016
Expiry date: 17-Apr-2020
Last updated: 18-Mar-2018

Registration status:
Registered until expiry date.

Name servers:
ns106.eukdns.com
ns107.eukdns.com

WHOIS lookup made at 07:30:53 01-Sep-2018

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  REFERRER http://www.nominet.org.uk

  REGISTRAR Nominet UK

SERVERS

  SERVER co.uk.whois-servers.net

  ARGS solarpoweredhome.co.uk

  PORT 43

  TYPE domain

DOMAIN

SPONSOR
Fasthosts Internet Ltd [Tag = LIVEDOMAINS]
URL: http://www.fasthosts.co.uk
Relevant dates:

  CREATED 17-Apr-2016

  CHANGED 18-Mar-2018

STATUS
Registered until expiry date.

NSERVER

  NS106.EUKDNS.COM 5.77.47.2

  NS107.EUKDNS.COM 5.77.47.3

  NAME solarpoweredhome.co.uk

DISCLAIMER
This WHOIS information is provided for free by Nominet UK the central registry
for .uk domain names. This information and the .uk WHOIS are:
Copyright Nominet UK 1996 - 2018.
You may not access the .uk WHOIS or use any data from it except as permitted
by the terms of use available in full at https://www.nominet.uk/whoisterms,
which includes restrictions on: (A) use of the data for advertising, or its
repackaging, recompilation, redistribution or reuse (B) obscuring, removing
or hiding any or all of this notice and (C) exceeding query rate or volume
limits. The data is provided on an 'as-is' basis and may lag behind the
register. Access may be withdrawn or restricted at any time.

  REGISTERED no

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