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
Refer to PowerSpout Document Index Links for a complete index of documents.