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SolarHotty PV Water Heater Controller

SolarHotty is a Photovoltaic intelligent logic controller that allows you to apply Direct Current to any heating element controlled by a thermostat, thereby powering your water heater, space heater or cooking device directly from solar PV at fraction of the cost of conventional inverters.

The kit includes

  • 1 x SolarHotty.
  • 1 x Operations manual.
  • 2 x Solar cable fittings.

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Regular Price: R 4,700.00

Special Price Excl. Tax: R 3,645.22 Incl. Tax: R 4,192.00


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Product Description


Converts photovoltaic (PV) solar power into electrical energy that is compatible with powering an existing standard AC geyser installation. SolarHotty has a patented innovation to allow the standard AC thermostat to utilize the supplied voltage (AC or DC) [Patent pending: 2017/00889 and GB1610106.5]. The electrical wiring interface to the geyser is the only change you will need to make to the existing installation.

SolarHotty Features

  • 200-240V 50/60Hz Mains AC Supply.
  • No battery or inverter needed.
  • Works on a standard geyser AC thermostat.
  • Automatic switching between AC and PV DC sources depending on solar level.
  • PV supply from one or more series-connected solar panels (Refer to Images above).
  • Automatic maximisation of PV power using inbuilt.
  • Maximum Power Point Tracker (MPPT).
  • Rugged steel housing PV DC supply short-circuit protection against geyser element load failure.
  • LED indicators for fault indication and PV supply indication.
  • Protection against PV panel reverse-polarity.
  • Easy mounting to roof beam provided by pre-drilled bracket.
  • Zero configuration installation.
  • Continual monitoring of health and integrity with failsafe operation.

A Certified Solution

  • The SolarHotty product has been certified to:
  • SANS/IEC 60669—1:2007,
  • SANS/IEC 60669—2-1:2009 — Electronic Switches for household fixed-electrical installations.
  • Certification of Compliance with SANS 10400 XA2 in accordance with SANS 10252-1.

All wiring and fitment standards as per national standards

  • Electrical: SANS 10142—1:2017 Edition 2: Part 1
  • Solar panels: SANS 10142—1:2017 Edition 2: Part 1 SANS/IEC 60364——7—712: Edition 2, 2017-04: Part 7—712.

SolarHotty Specifications

  • Enclosure Ingress rating: IP50.
  • Enclosure: Enamel plated mild steel.
  • Suitability: Installation in a roof or protected electrical environment.
  • Humidity: 10-90% RH (no dew condensation).
  • Temperature: -20°C to +55°C.
  • Standard: IEC 60669-2-1:2009.
  • Power supply: 200-240V 1ph 50/60Hz; up to 4kW geyser feed through; 11VA burden.

Solar PV supply

  • PV panel string not exceeding a total of 1500W.
  • Same specification for each panel in the string.
  • PV panels in a series-only connection.
  • PV string Maximum PV Voltage and Maximum PV Current must not exceed the specifications below.
  • Maximum PV Voltage: 240V (i.e. total series connected open-circuit PV panel voltage).
  • Maximum PV Current: 9 A (i.e. total connected short-circuit PV panel current).

System protection

  • PV DC supply short-circuit protection.
  • PV DC reverse polarity protection.

LED Legend

  • Fast-flashing (100ms on / 100ms off): performing self-tests.
  • Slow-flashing (500ms on / 500ms off): supplying AC to the geyser element.
  • On: supplying PV DC to the geyser element.


  • Flashing (500ms on / 500ms off): PV panels connected in reverse polarity.
  • On: Fault – either element short circuit or other faults.
  • Off: No detectable fault.

Additional Information

Additional Information

Collector / Panel Type Photovoltaic Water Heater Controller
Disclaimer Please note that stock availability is subject to prior sales. Prices exclude delivery. The image serves as an example of what the product looks like and may differ slightly in appearance.
Guarantee/ Warranty 12 month product warranty


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