panel expansion

[bug]

Can anyone help with my conundrum.At present I have a twenty tube (47mmx1500mm) navitron panel it's been up for 4/5 years I Was happy with the out put until my brother installed a thirty tube (58mm x 1800mm)panel and is getting so much better results we both have similar set ups, pipe runs/tanks etc. I know his is obviously going to be higher output but my question is..... do I go for putting another 20 tube panel up (so I will have 40 x 47mm x 1500mm)or start again with a 30 tube 58mm x 1800mm panel. I have looked at the outputs and it seems that 2x20tubes is still less than 1x30 tubes ofcourse   an additional 20 tube panel would be the cheaper option but I don't want to regret it for the sake of saving a few quid. Hope this makes some sort of sense and I would like to see any comments you all have.

[2807]

Hello bug

do I go for putting another 20 tube panel up (so I will have 40 x 47mm x 1500mm)or start again with a 30 tube 58mm x 1800mm panel. I have looked at the outputs and it seems that 2x20tubes is still less than 1x30 tubes ofcourse   an additional 20 tube panel would be the cheaper option but I don't want to regret it for the sake of saving a few quid. Hope this makes some sort of sense and I would like to see any comments you all have.

As a general rule, if I understand correctly, a 58mm tube has about 1.5 times the output of a 47mm tube - so 30 x 58mm tubes will have the same output as 45 x 47mm tubes.

What about adding a 30 x 47mm panel to give you just a bit more output than your brother.

2807

[micko]

Its all on what you need and space available, in my opinion the bigger the better. Just link the two together.

[bug]

HI,Cheers for the comments
I did think about putting a 30x 47mm x 1500mm panel linked to the existing 20 x 47mm x 1500mm but I was a little confussed/ worried about the temperature differential betwixt the two as only one manifold sensor up on the roof. Would I need to locate the sensor in the largest panel for it to work properly ?

[2807]

Hello bug

I did think about putting a 30x 47mm x 1500mm panel linked to the existing 20 x 47mm x 1500mm but I was a little confussed/ worried about the temperature differential betwixt the two as only one manifold sensor up on the roof. Would I need to locate the sensor in the largest panel for it to work properly ?

Why would there be a temperature differential betwixt the two? Unless you are thinking about plumbing them in parallel? I would simply plumb them in series & make sure that the temperature sensor was as near the "exit" end of the flow as I could get it.

2807

[micko]

As above