29/6/2013 System live at 13:00
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 Mod Cost
Meter, switch and cable I already had
| IP Power Switch
|Din Rail Relay
|Din Rail Enclosure
|2m Female kettle extn lead
|Solar PV - Immersion Data
|Date / Time
|Threshold - Spring
|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|
|Port 1||Immersion Heater|| ON|
|Port 2|| - || OFF|
|Port 3|| - || OFF|
|Port 4|| - || OFF|
|25-03-2017 08:30 ||2000||2015||ON|
|25-03-2017 08:34 ||2400||2037||OFF|
|25-03-2017 09:12 ||2400||2402||ON|
|25-03-2017 13:30 ||2400||2396||OFF|
|Immersion Time||Date / Time ON||Date / Time OFF||Time ON||Total Time On|
|25-03-2017 08:30||25-03-2017 08:34||4||4 mins|
|25-03-2017 09:12||25-03-2017 13:30||258||262 mins|
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