OP
chriswarhurst
Let me know when you have developed one - i will be very interested
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Discuss Immersion Heater - PV electricity in the Central Heating Systems area at ElectriciansForums.net
I too spoke with Crydom some months back, the problem with PWM is inherently the speed of the sampling rate is too fast for the Crydom Thyristor circuit to recover, and therefore would not work.Methley, have you successfully got the Crydom working via PWM and filter? Crydom advised me "The analogue DC input is sensed by a micro-controller, a PWM input would either not be recognized or falsely interpreted. The PWM signal would have to be converted to DC signal." which led me to doubt that a filter would give a clean enough input, and as a result might damage or overheat it.
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That sounds very plausible and does make it less attractive if you are offsetting the cheapest fuel - mains gas. Same problem there has always been with solar water heating: loads in the summer and not enough in the winter. And you could also argue that offsetting gas consumption with electricity is not very environmentally friendly. I did ponder the idea of overriding the freezer thermostat to reduce its consumption from the grid at night, but of course that's a fairly small fixed load and has the additional complication of not liking to be short cycled.Was surprised at how little the potential savings were, though. Checking the gas meter these past few weeks without heating on, converting to kWh, and plugging in the cost per unit I reckon about 50p per day on HW. In summer its likely HW will max out on the temp stat part way through the day and in winter it'll struggle to put much surplus into the HW tank. So maybe 1/3 of the annual cost will be saved - say £60 - which is worth having but limits options - yeah I know its a crude calculation but probably not wildly out.
There is a 5V version available.an Op-Amp to double the voltage.
There is a 5V version available.
Ah sorry of course - the correct part would be an MCPC2425A or an MCPC2450A, neither of which RS sell.Taken a look. Its a burst fire controller, not a proportional controller.
Excellent stuff! Would love to see the circuit diagram.
Ah sorry of course - the correct part would be an MCPC2425A or an MCPC2450A, neither of which RS sell.
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