Power Your Heater with Solar Surplus and Save on Your Electricity Bill

"PV Heater Control System" is a system designed to help you save on electricity bills by ensuring that the power consumption of your heater comes entirely from solar energy. This increases the self-consumption rate of your PV system and reduces electricity expenses.

Who Can Benefit from This System

If your system meets the following conditions, this solution can help you save on electricity costs:

• The system includes solar PV generation
• The feed-in tariff is significantly lower than the electricity price
• The system includes resistive loads, such as tank water heaters
• The system has a relatively low self-consumption rate

Introduction of "PV Heater Control System"

This system is implemented using the Energy Cost Reduction Kit (consisting of one IAMMETER energy meter and one IAMMETER Wi-Fi power controller).

• The energy meter is required to monitor grid power and can optionally monitor inverter output power.
• The power controller reads the energy meter data in real time and dynamically adjusts the power output of the resistive load.

Operating Principle

The IAMMETER energy meter measures grid power in real time.

The IAMMETER Wi-Fi power controller dynamically adjusts the power output of the resistive load based on the grid power data received from the IAMMETER energy meter.

• When the grid power measurement indicates surplus PV energy is being fed into the grid, the heater's power input would be increased.
• When the grid power measurement indicates electricity is being drawn from the grid, the heater's power input would be reduced.

How to Calculate the Electricity Savings with This System

Before

After

The electricity cost of operating a heater typically depends on three factors:

1. The energy consumption of the heater.
2. The proportion of the energy consumption covered by solar power.
3. The difference between the grid electricity price and the feed-in tariff.

Let's use a practical example to demonstrate the savings calculation:

If you have a tank water boiler (single-phase, maximum power less than 3.7 kW) and a solar PV system:

Assume your boiler previously consumed 10 kWh of energy daily, and 50% of this energy was supplied by solar power.

After installing our saving kit, you can configure the boiler to be powered entirely by solar energy (this percentage can be adjusted based on your situation).

If the feed-in tariff is 0.05 AUD/kWh and the grid electricity price is 0.25 AUD/kWh, then the "Energy Cost Reduction Kit" can help you save up to: (0.25 - 0.05) * 5 = 1 AUD per day

You can estimate the potential savings based on your specific scenario.

How to use WPC3700 in different mode

If you have obtained a WPC series power controller, there are a few possible modes of operation:

1. You have already installed IAMMETER meters on the grid side and are directly using the WPC3700 in conjunction with IAMMETER meters (WPC3700 operates in auto mode), allowing the WPC3700 to work continuously under the drive of solar surplus, which is the IAMMETER solution PV Heater Control System.
2. You don't have an IAMMETER meter, but you are familiar with Home Assistant or Node-RED and have integrated the WPC3700 into the HA or Node-RED automation system (Enable MQTT discovery in Home Assistant with the latest IAMMETER firmware (i.76.058.8)).
3. You need to call the APIs of WPC3700 to integrate the WPC3700 into your own system.

Please use the WPC series power controller based on your specific needs and requirements.