Installation manual

 Fit a PWM controller (with lower settings) to the battery as well

5.8.1. Diversion via the inverter output

The schematics show diversion of surplus energy on the DC side of the system. It is also

possible to divert surplus energy to heat on the 230/240/110 V AC output side of the inverter.

A water pump or water heater can be turned on to soak up this surplus.

In domestic systems where there is plenty of hydro power, a standard thermostat-controlled

AC element or elements (small element in the range 250-1500W) may be used. This method

puts more AC load on the inverter and cycles the batteries more. Multiple small elements

will give smoother operation. The advantages of AC diversion over using a PWM controller

at the battery are:

 you can use standard grid-voltage heating elements (for water tanks etc).

Note: standard 120 V elements can be used with many MPPT regulators

 the wiring to the heater can be normal AC house-wiring

 the heaters are silent in operation.

 the built-in thermostat can switch the AC current safely

5.9. Diversion Load: Hot Water Element

Diversion loads used with the PWM type of controller need

to be very robust, and where there is any chance of failure a

secondary diversion load controller to an air resistive

element (space heater) should be installed. Always ask

yourself what are the consequences for your battery if a

controller fails? Your answer will assist you in making the

correct controller choice.

Hot water diversion element