my-PV AC ELWA 2 water heaters up to 3.5 kW for grid-connected PV systems

The AC ELWA 2 from my-PV (MPN: 16-0150) is a 3.5 kW, flexibly controlled water heater for grid-connected PV systems. The successor to the ELWA-E uses surplus photovoltaic energy to optimize your self-consumption and increase self-sufficiency. This automatically reduces your operating costs. Thanks to the stepless control, the surplus energy is used optimally. Even when there is little sunshine, it ensures constant hot water by using the public power grid. The device can be installed in both hot water and buffer storage tanks. The my-PV Cloud is available so that you can keep an eye on everything and react quickly. In the off-grid sector, the ELWA 2 can operate in frequency mode. It is compatible with great brands such as Victron Energy, Growatt, Huawei, Studer and SMA.

about the water heater

• Stepless regulation from 0-3.5kW, depending on the PV surplus
• Frequency mode in the off-grid range
• External extension with a 3kW heating element
• Can be installed in hot water and buffer storage tanks
• Optional hot water backup
• Everything at a glance - thanks to my-PV Cloud
• Fixed wiring - no cable with earthed plug
• Simple operation thanks to touch display
• Many different communication options
• Compatible with manufacturers such as Victron, Growatt and Huawei
• 2-year manufacturer's warranty

German Design Award Winner 2024

"The AC ELWA 2 converts excess solar power into hot water, thereby increasing self-sufficiency. A sensible product that strikingly expresses the demand for high-tech and performance with its clear and dynamic design language." With these words, the jury of the prestigious award praised the infinitely variable water heater for grid-connected photovoltaic systems.

Functionalities in various combinations

...with WiFi meter
In combination with the my-PV WiFi Meter, the AC ELWA 2 uses only the surplus energy from your photovoltaic system. The heating element regulates its output continuously so that almost no energy is fed into the grid and your self-consumption is optimally maximized. The connection to the router is simple via a patch cable or wirelessly via WiFi.

... with battery storage
The water heating device harmonizes with many well-known battery storage systems and optimizes the use of your PV yields. First, the battery storage unit is charged. As soon as it is full, the AC ELWA 2 efficiently stores the surplus energy as hot water. Water as a storage medium is particularly cost-effective and can be ideally supplemented with chemical storage batteries. In this way, the electricity generated stays with you and is not fed into the grid.

...with Smart Home
Thanks to its open system control, the AC ELWA 2 can communicate seamlessly with commercially available smart home and energy management systems. Your smart home system takes over the control, so that even complex controls with prioritization for different consumers are possible. In residential buildings, this technology enables several devices to work together. Remote monitoring and energy cost billing can be easily implemented at apartment level.

No sun, but still hot water?

With the optional hot water backup, the ELWA 2 ensures a reliable hot water supply even in bad weather. Simply and conveniently connect it to a power socket. No mains supply is required, so no metering point is necessary. Enjoy a convenient and reliable hot water solution, even in bad weather.

Areas of application

Single-family home - The heater is the perfect solution for your hot water storage tank. It works completely independently of the power grid, ensuring a continuous hot water supply even in the event of power failures. Thanks to its extremely low starting current, the ELWA 2 starts even with minimal solar radiation, which impressively underlines its outstanding performance and reliability.
In residential buildings - With decentralized storage and hot water preparation, you avoid the usual energy losses in the pipes and enjoy hygienically treated hot water at the same time. The AC ELWA 2 impresses with its particularly high solar coverage.

my-PV Cloud

With the my-PV Cloud, you can keep an eye on your sustainable and cost-efficient heat generation at all times - in real time. The live view shows you the current output, the collected daily energy and the temperature and charging power curve. Your customizable dashboard gives you quick and clear access to all important information. Remote settings are also possible at any time.

• surplus of the PV system
• Power consumption
• Temperature development of the water or heating
• Amount of grid feed-in and grid consumption
• Device power/PV power
• Temperature display

Technical data

• Heating output: 0-3500W + 16A switching output
• Fuse protection: 13A or 16A
• Mains connection: 3-pole terminal, 2.5mm² 230V, 45-65Hz
• Standby consumption: <1.5W
• Efficiency: 99.3% at rated power
• Tightening torque: 50Nm
• Max. Operating pressure: 10bar
• Communication interfaces: LAN, WLAN, RS485, PWM
• Operating temperature range: Ambient temperature at housing 0°C - 40°C
• Storage temperature: -20°C - +70°C
• Protection class: IP21
• Weight: 2kg
• Dimensions: 580 x 133 x 177mm

Scope of delivery

1x my-PV AC ELWA 2 water heater
1x accessory box