Volt-Watt mode is a feature of smart inverters supporting the grid by curtailing the output of solar power during periods of high grid voltage. If the grid voltage is high, this mode reduces the solar power output to keep the voltage from getting too high, which is critical for grid reliability as more distributed energy resources, like rooftop solar, come online.
The reasoning behind implementing Volt-Watt mode is to handle grid stability; however, this has the consequence of less produced solar power by users in cases of high voltage. To address potential impacts, there have been reporting methodologies in development that would further monitor and resolve functionality issues with Volt-Watt.
Nationally, here is a breakdown regarding exactly how Volt-Watt mode functions and its meaning:
Grid Voltage Management
Solar PV systems can cause an increase in grid voltage, mainly at times when generation exceeds the local demand. In Volt-Watt mode, there is an automated adjustment of the output from the solar system to reduce power when voltage goes above a certain threshold to maintain stability.Function of Volt-Watt Mode
When the grid voltage rises above the set level, volt-watt mode reduces the output of solar power so that voltage does not rise above the safe or optimal levels, thus supporting grid stability.Impact on Power Production
While this adjustment is good for the grid, it reduces the amount of power produced, therefore impacting the energy savings for solar customers. This reduction could apply to both the power exported to the grid and that available for home use, depending on how a system is designed.Consumer Implications
There are trade-offs in the implementation of Volt-Watt mode. While it helps grid reliability, Volt-Watt mode may reduce power generation and savings. Ancillary equipment may be required to be able to target reductions to exported power, to ensure that minimum impact is on home-used energy.To help mitigate any potential issues with Volt-Watt mode, consider the following:
Monitor AC Voltage Data
Check your voltage data coming from your solar system. Systems on a 240-volt service should look for readings above 254 volts that might indicate whether Volt-Watt mode may be activated.Understand Volt-Watt Triggers
In the case of voltage exceeding 106 percent nominal, Volt-Watt mode may drop power output, impacting solar generation and, subsequently, energy savings.Estimate Potential Curtailment
Using methodologies similar to those applied by utilities, estimate potential fall off in power output. This can help measure the effect of Volt-Watt mode in system performance.Timely Complaints
If high voltage is affecting the production in your system, launch a complaint without any hesitation against your utility or the relevant authority. Be sure to keep records of the cases in which high voltage occurs and leads to a reduction in the output, in order to support your complaint.Financial Compensation
Financial Compensation Utilities typically do not provide any financial compensation for past losses due to underproduction. Monitoring your system ensures a solution is provided before problems arise, hence reducing losses.We design and manufacture high-quality switchboards. Contact us today to discuss your requirements and get started!