Use solar power only for hot water
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.
Your advantages with hot water from photovoltaics
Easier and cheaper than thermal solar systems
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
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