ELWA
ELWA is a 2 kW photovoltaic water heating device. Direct current from photovoltaic modules is transferred directly to the built-in heating element and immediately converted into heat without loss. The built-in MPP Tracker ensures that the PV generator is always operated at the optimum operating point (similar to a PV inverter).
For operation, no connection to the mains is required as the unit is powered by the PV generator (pure off-grid operation). The desired DHW temperature is set with a rotary knob, LED displays inform about the current device status.
The ELWA uses direct current directly from your PV-modules in a built-in immersion heater element and thus
produces hot water directly and without any loss.
Pure island off -grid operation – no grid
connection required
Boost-backup for operating in bad weather
In summer 100 % hot water without
additional heat sources
Lower operating costs and longer service
life for the heating system
It’s as easy as this: use a rotary knob to set the desired hot water temperature. LED displays inform you of the
current status of the system. The electricity for the hot water is obtained directly from the PV modules.
Each watt is utilized: Linear control from 0 to 2 kW, depending on PV yield.
No grid operator approval required: You save yourself tedious administrative work, because ELWA does not feed electricity into the grid. Especially in multi-storey apartment projects, the approval can take several months for grid-connected PV systems.
Easiest installation with "cables instead of pipes", less valuable copper, no maintenance costs.
Stratification-heating possible with 2 devices.
Even works in case of power failure.
Boost-backup optionally usable.
No anti-freezing liquid necessary
Cables have almost no energy loss compared to pipes
DC Operation
DC voltage = MPP voltage range 100 – 360 V (max)
Number of MPP trackers 1
Max. input current 10 A, limited
DC nominal power 2.000 W at 25° C ambient temperature, built-in derating
DC inputs MC4, 1 string
AC Operation
Heating power 750 W
Mains supply single phase, 230 V, 50 – 60 Hz
Fuse 10 A min.
Power cord 3 m
Standby-consumption 0 W at DC operation, <2 W at AC operation
General data
MPP-efficiency 99.9 %
Total efficiency >99 % at nominal power
Protection class IP20
Operating temperature range 10 °C to 40 °C
Display 3 LED‘s
Interface Serial IR Interface
Dimensions (lxhxd) 130 x 190 x 600 mm including heating rod
Weight 2 kg
Heating rod length 45 cm
Heating rod thread dimension G 1 1/2 inch
