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Solar Pv Dump Controller And Two Immersion Heaters
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<blockquote data-quote="ProDave" data-source="post: 324153" data-attributes="member: 6969"><p>Changeover contactor would be simpler, but I have plenty of NO contactors so that would be "cheaper" to use two.</p><p></p><p>Contactor must be powered independently (e.g from an FCU somewhere) It can't be powered from the output of the optimmersion, because at low sun levels it may only be producing a small output (burst firing I believe)</p><p></p><p>I did wonder about using the immersion heaters own thermostat, but that might be considered unsafe, introducing other control elements. They are both unvented tanks, and I don't want to be the one explaining to the judge how I interfered with one of the safety features of an unvented tank.</p><p></p><p>Mind you the hardest bit is probably going to be getting a secondary tank stat fitted. I need to go and have a look and see if there's a pocket to put a capillary stat into. Otherwise I don't relsih the thought of cutting a rectangular hole in the outer (i think) steel casing of an unvented tank.</p></blockquote><p></p>
[QUOTE="ProDave, post: 324153, member: 6969"] Changeover contactor would be simpler, but I have plenty of NO contactors so that would be "cheaper" to use two. Contactor must be powered independently (e.g from an FCU somewhere) It can't be powered from the output of the optimmersion, because at low sun levels it may only be producing a small output (burst firing I believe) I did wonder about using the immersion heaters own thermostat, but that might be considered unsafe, introducing other control elements. They are both unvented tanks, and I don't want to be the one explaining to the judge how I interfered with one of the safety features of an unvented tank. Mind you the hardest bit is probably going to be getting a secondary tank stat fitted. I need to go and have a look and see if there's a pocket to put a capillary stat into. Otherwise I don't relsih the thought of cutting a rectangular hole in the outer (i think) steel casing of an unvented tank. [/QUOTE]
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