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Green Renewable Energy Forum
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Solar PV system with not tied into the grid?
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<blockquote data-quote="fourtytwo" data-source="post: 529187" data-attributes="member: 34950"><p>I have had a PV water heating system such as you describe since 2015. I am intrigued by your description of a 240V AC supply for the immersion heater as this would cause it to absorb its maximum rated power (perhaps 2.4 or 3Kw) that may be far in excess of the power produced by the panels. In my case I have a converter between the panels and the heater that runs an MPPT algorithm and generates a variable output voltage to ensure the heater only absorbs as much as the panels can generate.</p><p></p><p>I cannot see any reason for not using the grid earth (are you overhead or underground supply ?), this is likely to be a lot more solid than a few rods banged into the ground. This could certainly be used for earthing the HWcyl itself and as the PV array & heater are floating then there is no reason to not earth one of those poles too, in fact it maybe advisable to prevent breakdown of the heaters insulation that is only intended to withstand normal grid power with a loosely grounded neutral.</p><p></p><p>I too looked at direct solar water heating but was put off by the plumbing, new cylinder, weight on the roof, pumps, anti-freeze etc etc</p></blockquote><p></p>
[QUOTE="fourtytwo, post: 529187, member: 34950"] I have had a PV water heating system such as you describe since 2015. I am intrigued by your description of a 240V AC supply for the immersion heater as this would cause it to absorb its maximum rated power (perhaps 2.4 or 3Kw) that may be far in excess of the power produced by the panels. In my case I have a converter between the panels and the heater that runs an MPPT algorithm and generates a variable output voltage to ensure the heater only absorbs as much as the panels can generate. I cannot see any reason for not using the grid earth (are you overhead or underground supply ?), this is likely to be a lot more solid than a few rods banged into the ground. This could certainly be used for earthing the HWcyl itself and as the PV array & heater are floating then there is no reason to not earth one of those poles too, in fact it maybe advisable to prevent breakdown of the heaters insulation that is only intended to withstand normal grid power with a loosely grounded neutral. I too looked at direct solar water heating but was put off by the plumbing, new cylinder, weight on the roof, pumps, anti-freeze etc etc [/QUOTE]
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Solar PV system with not tied into the grid?
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