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Use solar power directly for domestic water heating.

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.


Hausgrafik ELWA EN

Always warm water, even during bad weather.

Due to the patented boost-backup function, hot water supply can be guaranteed even during bad weather. This makes it possible to completely switch off the conventional heating system in summer. This also increases its lifespan.

For commissioning the boost-backup function, ELWA can be easily connected to a mains socket. There is no feed-in into the grid, so it does not need a metering point like a grid-connected PV system.


Tip With our my-PV Power-Coach you can easily and quickly get a personal analysis of your system.



hakerl Easier and cheaper than thermal solar systems
hakerl 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.
hakerl Easiest installation with "cables instead of pipes", less valuable copper, no maintenance costs.
hakerl Stratification-heating possible with 2 devices.
hakerl Even works in case of power failure.
hakerl Boost-backup optionally usable.
hakerl No anti-freezing liquid necessary
hakerl Cables have almost no energy loss compared to pipes


Tip Further advantages can be found here.



ELWA Software

Data evaluation with USB interface

ELWA has an integrated data logger. With the USB interface and the free ELWA software, you can read out your solar yields and see, for example, the temperature increase of your hot water. In addition, device settings can be easily customized for your individual needs.

Remote monitoring with Modbus interface

In case that several devices are to be controlled and monitored from a central location, my-PV has developed a suitable Modbus interface. This solution is particularly suitable for apartment projects. In addition, a further temperature sensor can be integrated into the controller.


Tip Find projects, we have implemented with innovative partners here.


Technical data

DC nominal power 0 - 2000 W with MPP tracking
DC inputs 1 string, 100 - 360 VDC, MC4
AC boost power 750 W for boost-backup
Mains connection Single-phase, grounded plug, 230 V, 50 - 60 Hz
Dimensions (WxHxD) 130 x 190 x 600 mm with heating element
Protection class IP 21



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