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 excess photovoltaic energy to optimize your self-consumption and increase self-sufficiency. This automatically lowers your operating costs. Thanks to its continuously variable control, excess energy is utilized optimally. Even when sunlight is low, it ensures a constant supply of hot water by drawing on the public power grid. The unit can be installed in both hot water and buffer storage tanks. The my-PV Cloud is available to help you keep track of everything and respond as needed. In off-grid applications, the ELWA 2 can operate in frequency mode. It’s compatible with leading brands such as Victron Energy, Growatt, Huawei, Studer, and SMA.

About the Water Heater

• Continuously variable control from 0–3.5 kW, depending on PV surplus
• Frequency mode in off-grid applications
• External expansion with a 3 kW 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 cables with Schuko plugs
• Easy operation thanks to the touchscreen display
• Many different communication options
• Compatible with manufacturers such as Victron, Growatt, and Huawei

German Design Award Winner 2024

“The AC ELWA 2 converts excess solar power into hot water, thereby increasing self-sufficiency. A practical product that strikingly embodies the standards of high-tech and performance through its clean and dynamic design language.” With these words, the jury of the prestigious award praises the continuously adjustable hot water heater for grid-connected photovoltaic systems.

Various operating modes

...with WiFi Meter
When used with the my-PV WiFi Meter, the AC ELWA 2 utilizes only the excess energy from your photovoltaic system. The heating element continuously adjusts its output so that virtually no energy is fed back into the grid, thereby maximizing your self-consumption. Connecting to the router is straightforward—either via a patch cable or wirelessly via Wi-Fi.

...with a battery storage system
The water heater is compatible with many well-known battery storage systems and optimizes the use of your PV output. First, the battery storage system is charged. Once it is full, the AC ELWA 2 efficiently stores the excess energy as hot water. Water as a storage medium is particularly cost-effective and can be ideally supplemented with chemical storage batteries. This way, the electricity you generate stays in your home and isn’t fed into the grid.

...with Smart Home
Thanks to its open system control, the AC ELWA 2 can communicate seamlessly with standard smart home and energy management systems. Your smart home system takes over control, making it possible to manage even complex control scenarios with priority settings for different loads. In residential buildings, this technology enables multiple devices to work together. Remote monitoring and energy cost billing at the apartment level can be easily implemented.

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 plug it into an outlet. No grid connection is required, so no meter point is needed either. Enjoy a convenient and reliable hot water solution, even in bad weather.

Applications

Single-family home— The water heater is the perfect solution for your hot water storage tank. It operates completely independently of the power grid, ensuring a continuous hot water supply even during power outages. Thanks to its extremely low startup current, the ELWA 2 starts up even with minimal sunlight, which impressively underscores its outstanding performance and reliability.
In Residential Construction— With decentralized storage and hot water production, you avoid the usual energy losses in the pipes while enjoying hygienically treated hot water. The AC ELWA 2 impresses with a particularly high solar coverage ratio.

my-PV Cloud

With the my-PV Cloud, you can keep track of your cost-effective heat generation at any time—in real time. The live view shows you the current output, the daily energy collected, and the trends in temperature and charging power. Your customizable dashboard provides quick and clear access to all important information. Remote adjustments are also possible at any time.

• Surplus from the PV System
• Electricity Usage
• Water or Heating Temperature Trends
• Amount of electricity fed into and drawn from the grid
• Device output/PV output
• Temperature display

Technical Specifications

• Heating power: 0–3,500 W + 16 A switching output
• Fuse rating: 13 A or 16 A
• Power connection: 3-pole terminal, 2.5 mm², 230 V, 45–65 Hz
• Standby power consumption: <1.5 W
• Efficiency: 99.3% at rated power
• Start-up torque: 50 Nm
• Max. operating pressure: 10 bar
• Communication interfaces: LAN, Wi-Fi, RS-485, PWM
• Operating temperature range: Ambient temperature at the housing 0°C – 40°C
• Storage temperature: -20°C to +70°C
• Protection rating: IP21
• Weight: 2 kg
• Dimensions: 580 x 133 x 177 mm

Package Contents

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