DIVERSION LOADS AND AUX RELAYS

If your battery is full or the grid is not available, there may not be sufficient load on your turbine, and it will overspeed (run away).  This may cause excessive noise and wear, and it is a wasted opportunity to use the energy.  We offer diversion load heaters and solid state relays (SSRs) to utilise or remove this surplus energy.  Normally the SSR will be triggered by the "Auxiliary relay" or "Aux port" in your battery charge controller, which produces a 12V signal..

Overspeed will not be a problem on low head sites (PLT under 25m, TRG under 5m, LH under 2.4m) but you may still want to harvest your excess to heat water.
Occasional overspeed is acceptable at higher heads (PLT up to 60m, TRG to 12m, LH to 5m) but this should not be everyday routine.
At higher head sites you should never allow overspeed apart from exceptionally, and for brief duration, as this will shorten bearing life.

There are 3 ways to divert surplus energy:

  • AC heating element via your inverter
  • DC heating element at your battery voltage
  • DC heating element at your turbine generation voltage

If you do not have a hot water tank or do not need hot water then you can use an air diversion heater.  Bear in mind also that the water may overheat unless you make contingency plans.

Please note: We only offer equipment for DC power diversion (DC SSRs). For AC diversion the equipment required is widely available.

For SSR applications above 100 VDC and for 120/240 VAC phase angle SSR applications Hugh Piggott (via a consultation) can assist/advise you.  

We recommend that you read our "PS MPPT Diversion Loads Guide" that you can locate below.

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

Crydom SSR (Solid State Relay)

Crydom SSR (Solid State Relay)

This Crydom D1D40 SSR is rated for up to 100V and 40 amps. I...

Crydom SSR (Solid State Relay) with fan cooled heat sink

Crydom SSR (Solid State Relay) with fan cooled heat sink

This Crydom D1D40 SSR is rated for up to 100V and 40 amps. I...

DC resistor air element 1.0 or 0.8 Ohm

DC resistor air element 1.0 or 0.8 Ohm

This single resistor air elements can be used on 12 & 24...

DC twin core hot water element 1.0 or 0.8 Ohm

DC twin core hot water element 1.0 or 0.8 Ohm

These twin core water elements can be used on 12, 24 and 48V...

DC twin resistor air element 1.0 or 0.8 Ohm

DC twin resistor air element 1.0 or 0.8 Ohm

These twin resistor air elements can be used on 12, 24 and 4...

Klampit 120 or 240

Klampit 120 or 240

A Klampit will place a short across the Smart Drive PMA if t...

Small water element (1” or 1 ¼” boss)

Small water element (1” or 1 ¼” boss)

We stock a limited range of small water elements in the foll...

Stove elements (Nominally 10 or 40 Ohm each)

Stove elements (Nominally 10 or 40 Ohm each)

We stock 2 elements that are commonly used on 120v and 240v...