Solar greenhouse heaters

Hi,
With the advance in solar panel technology has anybody used it to power a greenhouse heater if so with what and how did you do it, or does anybody know of any company who make and supply said item.
Happy gardening!

There are lots of interesting diy designs out there for passive solar heating using heat sinks (car radiators are one option) and solar powered fans/pumps, not sure how effective they are especially with the hours of sunlight we get when the heat is required.  Probably still more efficient though than trying to turn light into heat using photovoltaic panels.

I've tried the same thing without any success the trouble is for an average sized greenhouse you need between 2 and 3 kw of heating for my polytunnel its more like 6kw even at 2000w that rules out a 12v heater as the max available is around 300w if you use 12v panels and an inverter to 230 the inverter is expensive and you can't store the 230 in batteries, if you use dc photovoltaic panels and an dc/ac inverter a 3kw kit costs around 4K needs a 230v supply to power the inverter and you still can't store the generated power.

It's a good idea in theory but in practice it's just not viable as heating is such a power hungry aplication.