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Porth, Newquay, Cornwall. UK  Tell A Friend
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Updated27/04/2017 19:30 
 


Solar PV - Immersion Heater




29/6/2013 System live at 13:00

Project:- Use excess electric generated to heat the hot water

I heat the hot water by gas, which on average costs 37p per day, based on a sample of 7 days (10th to 17th June 2013), can this be reduced ?

Yes hopefully especially in summer, I wrote an extra script to deal with this, it checks the current output agaist a threshold figure, if its below this nothing happens if above, it switches an ip power switch on which in turn operates a relay putting the immersion heater on, should the output fall below the threshold it switches off the ip relay and contactor and immersion heater, the script checks every 2 minutes output against threshhold setting.

The immersion heater is 3 kw, appears to take less than an hour to heat water,so unless brillant sunshine there will be usage from the grid, say max 1kw that equates to 12.6p, still a possible saving of 25p. Ideal solution would be a 1kw element thereby increasing the time over threshold.

Script and ip power relay installed and electrical work completed. Scripting work not finished, when complete this page will show status of immersion heater/solar pv heating.

immersion

immersion control ip switch

 Immersion Mod Cost

 including p&p
 Meter, switch and cable I already had

IP Power Switch Ebay £112-98
Din Rail Relay Ebay £14-95
Din Rail Enclosure Ebay £4-95
2m Female kettle extn lead Ebay £2-39
  Total £135-27

Solar PV - Immersion Data
Date / Time 27-04-2017 19:42
Threshold - Spring 2700 W
Current Output 84 W
Peak Output 3623 W
Last Update 27-04-2017
Meter # 1306-73 kwh
Days solar 899
Days Gas 434
Aprrox Savings Ga1 ## 899 days @37p 332.63
# Meter since 29th June 2013, updated most days
## Approx saving on gas,averaged 37p per day


Solar - IP Power Switch Output Port Status  Last Update  27-04-2017 19:42
PortApplianceStatus
Port 1Immersion Heater OFF
Port 2 -  OFF
PortApplianceStatus
Port 3 -  OFF
Port 4 -  OFF

Immersion Data
Date/TimeThresholdOutputAction
27-04-2017 09:26 27002802ON
27-04-2017 13:40 27002414OFF
27-04-2017 13:42 27002803ON
27-04-2017 13:44 27002505OFF
27-04-2017 14:00 27002948ON
27-04-2017 14:02 27001872OFF
27-04-2017 14:12 27003620ON
27-04-2017 14:14 27002676OFF
27-04-2017 14:16 27003179ON
27-04-2017 14:34 27002516OFF
27-04-2017 14:36 27003263ON
27-04-2017 14:38 27002012OFF
27-04-2017 14:46 27002877ON
27-04-2017 14:50 27001593OFF
27-04-2017 15:28 27003020ON
27-04-2017 15:30 27002489OFF
27-04-2017 15:38 27002811ON
27-04-2017 15:40 27001400OFF


Immersion Time
Date / Time ONDate / Time OFFTime ONTotal Time On
27-04-2017 09:2627-04-2017 13:40254254 mins
27-04-2017 13:4227-04-2017 13:442256 mins
27-04-2017 14:0027-04-2017 14:022258 mins
27-04-2017 14:1227-04-2017 14:142260 mins
27-04-2017 14:1627-04-2017 14:3418278 mins
27-04-2017 14:3627-04-2017 14:382280 mins
27-04-2017 14:4627-04-2017 14:504284 mins
27-04-2017 15:2827-04-2017 15:302286 mins
27-04-2017 15:3827-04-2017 15:402288 mins

Log

4/1/2016 - One string connected, other faulty, no immersion heating.
2/2/2014 - Added Status of the ip power switch ports
29/6/2013 - Electrical work completed, live at 13:00, then the fog rolled in off the sea.
23/6/2013 Started on addition to script to show minutes on and total time over threshold.

Page under construction - updated 2nd February 2014
Update to display ip switch port status