I'm having a think about this.
I see the controller has provision for an off-peak supply to feed the long element, which is good. Presumably you have an economy 7 type of tariff, giving cheap night-time electricity, and no gas boiler.
So normally, you would want to heat the lower element every night, during the off-peak period.
But now you have solar panels, you would want to supply the long element whenever the iBoost is providing voltage, which will never be at night.
So you need the iBoost to be connected to the load terminals for the long element, bypassing the timer.
You will still need the timer for those 200 days a year when the sun doesn't shine and you want to use off-peak power.
If I was doing it, I'd want a 20A junction box, something liker the wiring centres used in central heating. It would not be tidy to do it inside the timer unit. And some warning labels to say the load side of the timer might be live even when the timer said "off," unless you incorporate changeover relays.
is there a neater way?
I see the controller has provision for an off-peak supply to feed the long element, which is good. Presumably you have an economy 7 type of tariff, giving cheap night-time electricity, and no gas boiler.
So normally, you would want to heat the lower element every night, during the off-peak period.
But now you have solar panels, you would want to supply the long element whenever the iBoost is providing voltage, which will never be at night.
So you need the iBoost to be connected to the load terminals for the long element, bypassing the timer.
You will still need the timer for those 200 days a year when the sun doesn't shine and you want to use off-peak power.
If I was doing it, I'd want a 20A junction box, something liker the wiring centres used in central heating. It would not be tidy to do it inside the timer unit. And some warning labels to say the load side of the timer might be live even when the timer said "off," unless you incorporate changeover relays.
is there a neater way?
