Installation manual

This should be adequate for one PowerSpout turbine. For 12V systems, use two in parallel.

For 48V systems, use two in series.

If this particular size of resistor is not to be found, or costs too much then a search through

stock lists may well throw up a bargain in a different size.

5.10.2. Common air elements 120/240 V

Common sources of air elements are:

 Elements for electric towel rails 100/150/200/300/400/500/600/750

Watt

 Hob elements in electric stoves typically 1500W

5.10.3. Common 120 V and 240 V elements used at different

voltages

These tables illustrate that if you take a standard 120 V 1500 W element and use it as a

diversion element on a 48 V battery system (56 V when fully charged) it will draw a

maximum of 327 W. If 2 were used in parallel you could divert up to 654 W. 327-654 W

continuously is sufficient to meet the hot water needs of many homes.

Power consumed by a heater depends on the square of the voltage applied to it. 1/4 the

voltage means 1/16th of the power. If you have a 12 or 24V battery bank then such

elements cannot be used as their ratings are just too low, hence you will need to buy a

special element for these applications.

5.11. Using AUX “PV trigger” relay settings

Some MPPT controllers have an AUX relay with a function that will activate it based on the

controller's incoming DC voltage (from the turbine side). For example the Outback FM60/80

has a “PV Trigger” setting (Midnite Classic products can also do this as can some other

makes). You can program the AUX relay to close when a voltage is reached. Using the

relay to connect a heater directly to the turbine allows the controller to load the turbine,

preventing its voltage rising high enough to activate the over-voltage crowbar.

Operating Power of 120V element available in Watts

Voltage 100 200 300 400 500 600 700 800 900 1000 1200 1500

14 1 3 4 5 7 8 10 11 12 14 16 20

28 5 11 16 22 27 33 38 44 49 54 65 82

56 22 44 65 87 109 131 152 174 196 218 261 327

120 100 200 300 400 500 600 700 800 900 1000 1200 1500

240 400 800 1200

Operating Power of 240V element available in Watts

Voltage 100 200 300 400 500 600 700 800 900 1000 1200 1500

14 0 1 1 1 2 2 2 3 3 3 4 5

28 1 3 4 5 7 8 10 11 12 14 16 20

56 5 11 16 22 27 33 38 44 49 54 65 82

120 25 50 75 100 125 150 175 200 225 250 300 375

240 100 200 300 400 500 600 700 800 900 1000 1200 1500