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Author Topic: Solar thermal compared to Solar PV  (Read 1162 times)
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« Reply #15 on: March 16, 2020, 05:58:19 PM »

Letís leave out solar for now.

Using resistive heating for space-heating and hot-water is insane. If you wanted to maximise your energy costs, that is what youíd do. An ASHP would save a vast amount of money.

Next consider insulation. If a construction or renovation was conducted with such extreme economic restraint that it used resistive heating for HW and SH then I guess the same shortsightedness was applied to insulation.

The payback for an ASHP vs resistive, and insulation can be as short as a year. Once youíve sorted those you can look into solar, the payback for which is... much longer.

12x JA Solar 340Wp panels (total 4080Wp)
Lux Power inverter charger
5x PylonTech 2000 2.4kWh batteries (total 12kWh (11kWh usable))
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« Reply #16 on: March 16, 2020, 10:35:07 PM »

Letís leave out solar for now.


 thread name is
Solar thermal compared to Solar PV


1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
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« Reply #17 on: March 18, 2020, 10:28:37 PM »

His leccy bill is £500/MONTH  Assuming HW is £400/month and the HP saves 66% then we have a saving of £3168/YEAR  thats well less than a yrs payback !!


Just a doggone second! 1500+ VAT is just the purchase cost. WHat about installation. Siting it. Electrical supply. Piping HW to and from it. etc. etc.
None of that is free, and must not be forgotten.

21 tube Kloben Panel/250L Megaflow, 1.68kWp Solar PV - 7 x 240W Sanyo Panels. Morso Squirrel WBS
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« Reply #18 on: March 19, 2020, 09:45:33 AM »

If hot water for showers is a major fraction then shower heat exchangers would be well worth looking at as well. It's worth looking at all the different options carefully though - doing all at the same time might mean that some of them won't be viable.
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