DC Twin Core Hot Water Element

These twin core water elements can be used on 12, 24 and 48V battery systems to divert surplus power to a water tank.  They have a 1 ¼” BSP boss, are 400mm long and are made from stainless steel. Each core is rated for 1kW.

Choose resistance from the drop-down menu.

• 1.0 Ohm pair can be wired as 2.0, 1.0 or 0.5 Ohm
• 0.8 Ohm pair can be wired as 1.6, 0.8 or 0.4 Ohm

The power dissipated in a resistor is calculated as follows:

• (fully charged battery voltage)^2 / resistance

For example a 1 ohm resistor on a 12V battery will dissipate 14x14/1 = 196W because it will reach 14 volts.

Also check that the maximum current draw does not exceed 30 amps or you may overload your SSR.

Current =  Power/fully charged battery voltage.

It is unlikely that your thermostat (if any) will be able to work with the DC current.

On DC water elements good practice is to ensure:

• Termination points are tight
• No insulation or combustible material near element connections
• Terminal cover is metal to reduce any fire risk from an arcing connections
• Check all dc connections annually for any sign of heat damage & rectify
• Consider the implications if the water tank boils
• Ensure element has water cover at all times
• Clearly label how element is to be turned off 
• Comply with local wiring rules

Refer to PS MPPT DC water heater installation Guide June 16  for install instructions.

For more information on diversion loads click here

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