Since the relay simply acts as a switch for the mains voltage, replacing two 100 watt 150 ohm resistors with a 600 watt resistor is a simple problem to solve.
300 watts / 220 volts is 1.36 amperes. The definition of a watt.
220 volts / 300 ohms is 0.73 amperes. Ohm's Law.
So now you need to check the rating on the solid state relay.
If it can handle the 1.36 amperes, then you need change nothing else.
If it can't, then replace it with one that can.
Since your bill of materials says it can handle 25 amperes, you are just fine simply replacing the old heating elements with the new one.
On Wed, Feb 25, 2015 at 1:00 PM, Andy Morgan <andrew.r.morgan@gmail.com> wrote:
Yeah, fair enough.--
I've attached the original circuit schematic in a .gif format, which is the only one I can find. And a rough BOM in a .txt file with as much relevant information as I could provide. The difference in the circuit schematic is that the two resistors would be replaced by the cartridge heater.
The mains power supply is 230V, 50Hz for New Zealand (you were close with Australia), and apparently the peak voltage would be 325V (230*sqrt(2)), though I'm not sure if that last bit of information actually helps.
Thanks for your help John (and I don't mean that sarcastically).
Andy.
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