AC ELWA
®
-F Assembly- and Operation Manual, 170224
4
6.
Electrical Connection
AC ELWA-F has to be connected to an earthed socket that is protected by a 13 A or 16 A circuit
breaker.
Earthing must be provided!
Use only in systems with protective earthing and leakage current detection!
Take care of other appliances connected to the same circuit breaker, this may trigger it!
7.
Operation with frequency-shift inverters
Frequency-shift inverters control battery charging in AC coupled off-grid PV systems by
changing the AC frequency.
The AC ELWA-F measures this frequency and detects if excess power is available. It controls its
heating power linearly between 0 and max. 3000 W.
It is recommended to set maximum power of the AC ELWA-F not more than half the power of
the battery inverter. The lowest adjustable maximum power limit of the AC ELWA-F is 500 watts.
Correspondingly, a power of at least 1 kW is recommended for the battery inverter.
Regarding the minimum capacity of the battery, follow the battery manufacturer's instructions!
The smaller the internal resistance of the battery, the less it can withstand load.
A minimum voltage of 24 V is recommended to limit the current. However, operation at lower
voltages is possible.
No control wire between the AC ELWA-F and the inverter is required.
8.
Controls and Indicators
Rotary knob for temperature
adjustment
1-6 … AC ELWA number (setting not
required)
13 A / 16 A … fuse setting
LED green Target temperature reached
(flashes at Standby)
LED yellow Normal heating mode
LED red Error condition
