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Updated25/03/2017 13:30 
 


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 25-03-2017 13:30
Threshold - Spring 2400 W
Current Output 2396 W
Peak Output 2903 W
Last Update 24-03-2017
Meter # 1257-43 kwh
Days solar 869
Days Gas 430
Aprrox Savings Ga1 ## 869 days @37p 321.53
# 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  25-03-2017 13:30
PortApplianceStatus
Port 1Immersion Heater ON
Port 2 -  OFF
PortApplianceStatus
Port 3 -  OFF
Port 4 -  OFF

Immersion Data
Date/TimeThresholdOutputAction
25-03-2017 08:30 20002015ON
25-03-2017 08:34 24002037OFF
25-03-2017 09:12 24002402ON
25-03-2017 13:30 24002396OFF


Immersion Time
Date / Time ONDate / Time OFFTime ONTotal Time On
25-03-2017 08:3025-03-2017 08:3444 mins
25-03-2017 09:1225-03-2017 13:30258262 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