Hi I am building a solar hot water system to be installed at my place in conil spain, all is fine till I try to find a pv powered pump to circulate the primary water from the panel through the cycinder coil. I have read that there are quality pumps out there that will easily run of a 30 watt panel, can I get one in the UK? Hope someone can help, thanks.
DavieyG (Guest)
22 Jun 2009, 2:52 PM
Some of the modern pumps use only 5 watts of power but they are AC. I assume you are going to install some sort of battery system. Are you? If so, you can charge the batteries then invert up from them to AC to power an ordinary pump. Try Grundfos.
Or SolarTwin do a solar-thermal system that comes with its own solar powered pump.
Logmaker (Guest)
26 Jun 2009, 11:14 PM
Hi I posted as below re Solar DHW query
One approach is to have the PV panel store power in a battery and a temperature switch controlling the pump across the battery, this turns on the solar pump only when the solar array is up to a specific temp and when not is storing power for when needed.
The battery can deliver the power for a heavier pump.
Our tests show this works.
ps We are evalutating a low wattage 12V pump which looks like it suits.
philip (Guest)
28 Jun 2009, 8:23 PM
hi 12v dc pumps are available from Laing corp, and the el sid pump range is available from ivan labs inc usa you might find a local agent on the net These pumps run direct from a solar panel i believe.
philip (Guest)
29 Jun 2009, 8:54 PM
hi again I have just bought an el sid pump direct from Ivan Labs USA 121 GBP You can email ivandelsol@bellsouth.net for info etc or phone USA 561 747 5354
heinbloed
14 Jul 2009, 12:05 PM
The company "Taconova" sells a solarstation incl. the mentioned pump, a solar powered pump.The station is called "FV70 Tacosol ZR Edition EU21". The manufacturer of the pump is "Laing", the pump model is called "ecocirc D5 solar 38/500B". I'm using it since about 18 month, it works perfectly. The advantage is-besides it needs no grid connection- that no thermostats are required, neither in the tank or at the collectors-provided a vacuum collector system is used in conjunction(no thermal losses). I have connected it to a PV CIS panel from "Wurth". As soon as the sun shines the pump starts working, if it gets darkl the pump stops. When the sunshine is strong it pumps over 6l/min, with a waeker sunshine it pumps less. Exactly what the collector wants. If a flat panel system is combined with this pumping system thermostats are required.
The Swiss company AMK is selling tube collectors with a small inbuild PV module, this can be connected straight to the station(low voltage, just 2 wires clipped onto).Again it is called "Edition EU 21".EU 21 holds a patent on this system.
If you need more informations ask here on the forum.
