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Porth, Newquay, Cornwall. UK  Tell A Friend
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Updated18/10/2017 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 18-10-2017 18:20
Threshold - Autumn/Winter 2500 W
Current Output 6758400 W
Peak Output 3589 W
Last Update 18-10-2017
Meter # 1520-82 kwh
Days solar 1016
Days Gas 487
Aprrox Savings Gas ## 1016 days @37p = £375.92
# 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  18-10-2017 18:20
PortApplianceStatus
Port 1Immersion Heater OFF
Port 2 -  OFF
PortApplianceStatus
Port 3 -  OFF
Port 4 -  OFF

Immersion Data
Date/TimeThresholdOutputAction
18-10-2017 10:40 25002602ON
18-10-2017 10:44 25001750OFF
18-10-2017 10:48 25002540ON
18-10-2017 10:50 25002461OFF
18-10-2017 10:54 25002536ON
18-10-2017 11:02 25002150OFF
18-10-2017 11:06 25002549ON
18-10-2017 11:14 25002491OFF
18-10-2017 11:16 25002536ON
18-10-2017 11:20 25001696OFF
18-10-2017 11:22 25002565ON
18-10-2017 11:24 25001339OFF
18-10-2017 11:42 25002509ON
18-10-2017 11:46 25002206OFF
18-10-2017 11:50 25002591ON
18-10-2017 11:52 25002220OFF
18-10-2017 13:30 25003044ON
18-10-2017 13:32 25001033OFF
18-10-2017 14:02 20002304ON
18-10-2017 14:04 2000953OFF
18-10-2017 15:24 20002010ON
18-10-2017 15:26 20001973OFF


Immersion Time
Date / Time ONDate / Time OFFTime ONTotal Time On
18-10-2017 10:4018-10-2017 10:4444 mins
18-10-2017 10:4818-10-2017 10:5026 mins
18-10-2017 10:5418-10-2017 11:02814 mins
18-10-2017 11:0618-10-2017 11:14822 mins
18-10-2017 11:1618-10-2017 11:20426 mins
18-10-2017 11:2218-10-2017 11:24228 mins
18-10-2017 11:4218-10-2017 11:46432 mins
18-10-2017 11:5018-10-2017 11:52234 mins
18-10-2017 13:3018-10-2017 13:32236 mins
18-10-2017 14:0218-10-2017 14:04238 mins
18-10-2017 15:2418-10-2017 15:26240 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