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Forum: Portugal

May 23rd 2022, 5:39 pm

Replies: 37

Solar Water Preheater?

Views: 2,130

Posted By liveaboard

Re: Solar Water Preheater?

Nice, I like it.
It looks like your angle is too flat for winter, but it's hard to tell in the photo.

Forum: Portugal

May 18th 2022, 12:45 pm

Replies: 37

Solar Water Preheater?

Views: 2,130

Posted By liveaboard

Re: Solar Water Preheater?

yes; the times a heatpump can make a lot of heat is when you don't need much heat.
They make noise, they're complex and expensive.
When solar pv costs so little, I think (the actual math needs real...

Forum: Portugal

May 18th 2022, 8:18 am

Replies: 37

Solar Water Preheater?

Views: 2,130

Posted By liveaboard

Re: Solar Water Preheater?

Ah, sorry for not reading your post more carefully.
I want to use it to heat and cool the house; I'll put the panels at 50 or 60 degrees so as to get the highest possible power in winter, when I...

Forum: Portugal

May 15th 2022, 11:11 pm

Replies: 37

Solar Water Preheater?

Views: 2,130

Posted By liveaboard

Re: Solar Water Preheater?

The ratings are fantasy of course, but not as bad as 25% unless it's an overcast day.
In which case, thermal panels won't do much either.

I thought 50% would be more realistic, but users I've...

Forum: Portugal

May 13th 2022, 10:43 pm

Replies: 37

Solar Water Preheater?

Views: 2,130

Posted By liveaboard

Re: Solar Water Preheater?

That's what I used to think, but now PV panels are 50 cents per watt.
2000 watts, 1000 euros.
The wire is much easier to run than an insulated pipe, and 20 meters or more is no problem (long...

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