{"product_id":"geyserwise-megawatt-saver-geyser-controller","title":"Geyserwise Megawatt Saver Geyser Controller","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Geyserwise MWS Controller is a solar PV water-heating controller designed to help convert a standard electric geyser into a PV-assisted hot water system. It uses MPPT technology to manage solar input from PV panels and supply controlled power to a compatible geyser element, reducing reliance on grid electricity for water heating where the system is correctly designed and installed.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMPPT solar control helps improve power conversion from the PV array to the geyser element.\u003c\/li\u003e\n  \u003cli\u003eSupports solar PV input with a maximum input voltage of 350 VDC and maximum solar array size of 4000 W.\u003c\/li\u003e\n  \u003cli\u003eDesigned for use with geyser elements from 1500 W to 4000 W, with supported element resistance from 12Ω to 27Ω.\u003c\/li\u003e\n  \u003cli\u003eCan operate from solar PV or 230 V AC supply, allowing for practical solar water heating with mains backup.\u003c\/li\u003e\n  \u003cli\u003eRS485 communication between the display and main MWS box.\u003c\/li\u003e\n  \u003cli\u003eWi-Fi support via Tuya or Smartlife applications for connected system control.\u003c\/li\u003e\n  \u003cli\u003eIncludes reverse polarity protection for solar PV connections.\u003c\/li\u003e\n  \u003cli\u003eIP32 enclosure ingress protection rating for suitable protected installation environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePV-assisted water heating for domestic electric geysers.\u003c\/li\u003e\n  \u003cli\u003eHomes looking to reduce grid electricity usage for hot water heating.\u003c\/li\u003e\n  \u003cli\u003eInstallations where a traditional pumped solar thermal system is less practical.\u003c\/li\u003e\n  \u003cli\u003eSolar geyser conversions where the geyser and PV array can be correctly matched to the MWS controller requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This Product?\u003c\/h3\u003e\n\u003cp\u003eThe Geyserwise MWS Controller is a practical option for homeowners and installers who want to use solar PV to heat water without adding a pumped thermal collector system. It is designed around PV input, MPPT conversion, geyser element control, and app-based connectivity, making it well suited to correctly specified South African solar water-heating installations.\u003c\/p\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eThis product must be installed by suitably qualified persons, and an electrical COC is required.\u003c\/li\u003e\n  \u003cli\u003eThe PV array must be designed so that the open-circuit voltage does not exceed the controller limit of 350 VDC.\u003c\/li\u003e\n  \u003cli\u003eThe maximum solar panel current must be below 15 A.\u003c\/li\u003e\n  \u003cli\u003eThe controller is not suitable for use with PTC elements.\u003c\/li\u003e\n  \u003cli\u003ePV panel selection, series configuration, geyser element resistance, irradiation level, roof structure, cable sizing, and safety requirements must be checked before installation.\u003c\/li\u003e\n  \u003cli\u003eDimensions, weight, included accessories, and warranty terms for the controller were not specified on the reviewed source page and should be confirmed before publishing if required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGeyserwise\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eMWS solar PV water-heating controller\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Input Voltage\u003c\/td\u003e\n\u003ctd\u003e350 VDC open-circuit voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRated Input Voltage\u003c\/td\u003e\n\u003ctd\u003e230 V AC, 350 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRated Input Current\u003c\/td\u003e\n\u003ctd\u003e20 A AC, 15 A DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSolar Input Voltage Range\u003c\/td\u003e\n\u003ctd\u003e125 VDC to 350 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMPPT Range\u003c\/td\u003e\n\u003ctd\u003e120 V to 350 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Input Current\u003c\/td\u003e\n\u003ctd\u003e15 A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Solar Power Conversion\u003c\/td\u003e\n\u003ctd\u003e4000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Solar Array Size\u003c\/td\u003e\n\u003ctd\u003e4000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSolar Connection\u003c\/td\u003e\n\u003ctd\u003eMC4 solar connectors\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSolar Output Voltage\u003c\/td\u003e\n\u003ctd\u003e40 V to 230 Vrms modulated sine wave\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSolar Output Current\u003c\/td\u003e\n\u003ctd\u003e20 A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAC Input\u003c\/td\u003e\n\u003ctd\u003e230 V AC, 50 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMains AC Voltage Range\u003c\/td\u003e\n\u003ctd\u003e85 V to 250 V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSystem Power Supply\u003c\/td\u003e\n\u003ctd\u003eSolar PV or 230 V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatible Geyser Element Power\u003c\/td\u003e\n\u003ctd\u003e1500 W to 4000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElement Resistance\u003c\/td\u003e\n\u003ctd\u003e12Ω to 27Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElement Compatibility\u003c\/td\u003e\n\u003ctd\u003eNot suitable for use with PTC elements\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThermostat\u003c\/td\u003e\n\u003ctd\u003eElectronic thermostat\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThermostat Safety\u003c\/td\u003e\n\u003ctd\u003eElectromechanical thermal cutout\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eReverse polarity protection for solar PV connections\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIngress Protection Rating\u003c\/td\u003e\n\u003ctd\u003eIP32\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCommunications\u003c\/td\u003e\n\u003ctd\u003eRS485 between display and main MWS box; Wi-Fi via Tuya or Smartlife applications\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eMWS to be mounted vertically\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandards \/ Approvals Listed By Source\u003c\/td\u003e\n\u003ctd\u003eEN \/ IEC 62109-1, IEC 60730-2-9, IEC 60730-1, EN \/ IEC 61000-6-3, EN 61000-3-12, EN \/ IEC 61000-3-11, EN \/ IEC 61000-6-1, ICASA Type Approval\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Geyserwise","offers":[{"title":"Default Title","offer_id":50238983012592,"sku":"SUS-MWS001","price":5519.95,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/7623\/6737\/files\/GeyserwiseMWS.jpg?v=1786439397","url":"https:\/\/www.sustainable.co.za\/products\/geyserwise-megawatt-saver-geyser-controller","provider":"Sustainable","version":"1.0","type":"link"}