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Posted By: SteamyTeaSlightly off the wall solution, could you change your HP to single phases ones?
Posted By: Ed DaviesBut, why do you need a relay to switch between the inverter and the pump? Why not just switch on the one you want to use at any given time? Would something terrible happen (other than them not work properly) if you accidentally switched them both on together? I don't think so.
Posted By: Ed DaviesAlternatively, is there any chance of using each string into a separate single-phase inverter on two of your three phases to at least save 2/3 of the cost of running the ASHP?
Posted By: Ed DaviesI take it you're up-to-date on the legal situation with feeding power into the grid in Spain which is a bit tricky I understand. Or are you trying to keep this completely disconnected from the grid?
Posted By: Ed DaviesHmmm… if going that way then why bother with an inverter and diverter - why not go DC to heat more directly? Save any controversy about 1.5 kW feed in limits.Posted By: jonc_uk: “Voc = 7x 39.7 = 277.9V; Vmp = 7x 31.3 = 219.1V”With appropriate DC switching you might get away with putting that into heaters designed for mains voltage.That's an interesting option, given that it's an inverter heat pump - however, it takes a 3 phase supply. Also, from a cabling point of view, it's the least convenient.Posted By: bxmanDo you have an more details on the Lorentz controller .When it is not pumping water does it any electrical output ?looks like the majority of their systems use the DC.The output from the controller is a sort of 3-phase DC to drive their own high-efficiency pumps. There is also level control so I would not be able to use their output.Do you propose to couple the panels to an inverter for winter use and then connect to the Lorentz controller when you need them for water pumping duties ?Yes, that's basically it.
Posted By: bxmanDo you have an more details on the Lorentz controller .When it is not pumping water does it any electrical output ?looks like the majority of their systems use the DC.
Do you propose to couple the panels to an inverter for winter use and then connect to the Lorentz controller when you need them for water pumping duties ?
Posted By: jonc_ukThat's an interesting option, given that it's an inverter heat pump - however, it takes a 3 phase supply. Also, from a cabling point of view, it's the least convenient.
Posted By: Ed DaviesThat's not what bxman or I had in mind: rather than using the heat pump at all why not just use the output of the PV for heating directly? OK, you don't get the COP benefit but it could be a lot simpler and more legally sound. If it's just for background heating when the place is not occupied (much) then the COP loss might not matter much and saves the wear and tear on the heat pump.
My extension of bxman's suggestion was to skip converting to AC at all but to heat directly with the DC output of the panels. Thinking about it today, perhaps sending up to 280 or more volts (have you taken the higher Voc in cold conditions into account?) into an unattended heater built for 240 volts might be pushing your luck. Better maybe to have two 240 V heaters in series running at derated power.
Posted By: bxmanCan you explain the system in Portugal in slightly greater detail I note you say you have 1Kw grid tied presumably one a single phase of your 3 phase supply is 1.5 the maximum you are allowed in total or on any single phase
Posted By: jonc_ukI think I will talk to a manufacturer and see what they say. There is a 4.5kW unit which might do the job.
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