my-PV ELWA PV hot water heater heating element

The ELWA from my-PV (MPN: 12-0100) is a 2kW PV water heater that uses your generated solar power to produce hot water. The direct current from your PV modules is transferred directly to the heating element and immediately converted into heat without any loss. The built-in MPP tracker ensures that the PV generator always operates at its optimum operating point. A grid connection is not required, as the ELWA is supplied directly from the PV generator in stand-alone operation. The hot water temperature can be easily set using a rotary knob, while the LED indicators inform you of the current device status. Please consult an authorized specialist for installation, as certain standards must be observed during assembly.

Product highlights

• Use 100% solar power
• Stepless control from 0-2kW
• 2 ELWAs can be used for shift charging
• More economical than conventional water heating
• Hot water supply can be used optionally
• Reheating from the grid
• No frost protection necessary
• No permit required
• Easy installation—cables instead of pipes

How it works

ELWA uses direct current from solar modules to efficiently heat your hot water – no grid feed-in, no inverter, and no connection permits required. Installation is incredibly easy. With this system, you can cover up to 50% of the hot water needs of a two- to four-person household.The water heater replaces thermal solar systems with an area of four to ten square meters and works optimally with a photovoltaic output of up to 2.5 kWp. For a continuous hot water supply, it can also automatically switch to grid power if necessary.

Your advantages over solar thermal systems

• Only two DC cables need to be laid instead of complicated piping
• Virtually no losses between the PV generator and the heat storage tank
• No moving parts and no frost protection control – maintenance-free
• PV modules even deliver a higher yield at low ambient temperatures
• The system restarts automatically and ensures that your heat supply remains continuous

No sun, but still hot water?

With its patented hot water guarantee, ELWA ensures a reliable hot water supply even in bad weather. This means you can switch off your conventional heating system in summer and extend its service life. Simply plug it into a power outlet for easy and convenient operation. No grid feed-in is required, so no metering point is necessary. Enjoy a convenient and reliable hot water solution that makes perfect use of your solar power.

Standard installation

The device is installed as low as possible in the storage tank to make efficient use of the entire water volume. The insulated heating rod is compatible with all common types of storage tanks, offering you maximum flexibility during installation. Choose between the standard G 1 1/2 inch socket for electric cartridges or mounting using an adapter on the flange plate.

Stratified charging

With two ELWAs in stratified charging mode, you can maximize the efficiency of your hot water supply. One device is installed in the upper part of the storage tank and the other in the lower part, making hot water available even faster. They communicate via the existing DC line, so no additional cabling is required.

Areas of application

Single-family home - The water heater is the perfect solution for hot water tanks with a capacity of 100 to 1000 liters. It operates completely independently of the power grid, ensuring a continuous supply of hot water even in the event of power failures. Thanks to its extremely low start-up current of only 2 watts, the ELWA starts up even with minimal sunlight, impressively underlining its outstanding performance and reliability.
In residential construction - In residential construction, the installation of grid-connected PV systems can often be complicated and time-consuming. With it, you will find the ideal solution for supplying every home with energy independently and efficiently - even in bad weather in summer.

Technical data

DC operation

• DC voltage=MPP control range: 100-360V (max.)
• Number of MPP trackers: 1
• Max. input current: 10A, current limited
• Nominal power: 2000W at 25°C ambient temperature, derating in case of overheating
• Number of DC inputs: Original MC4, 1 string

AC operation

• Heating cable: 750W
• Mains connection: 1-phase, grounded plug, 230V
• Frequency range: 50-60Hz
• AC fuse: 10A min.
• AC connection cable: 3m
• Standby consumption: 0W in DC mode, <2W in AC mode

General data

• MPP matching efficiency: 99.9%
• Total efficiency: >99% at rated power
• Interface: Serial IR interface
• Operating temperature range: 10°C - 40°C
• Protection class: IP20
• Weight: 2 kg
• Dimensions: 130 x 190 x 600 mm with heating rod
• Heating rod length: 45 cm

Scope of delivery

1x my-PV ELWA PV hot water heater
1x IP21 cover
1 pair of MC4 connectors
1x Installation and operating instructions