Otis Singleton
Smart meters are digital meters that use electronic sensors to measure electricity usage. While lightning strikes are rare, they are the most common source of power surges worldwide. These power surges can cause damage to any type of meter, including smart meters. In some cases, lightning strikes have caused smart meters to catch fire or malfunction, leading to concerns about their safety. However, there are also instances where smart meters have survived lightning strikes without any issues. To protect against lightning surges, some smart meters may have built-in surge protection or be supplemented with external lightning surge protection devices.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Do smart electric meters detect lightning surge? | No clear answer, but smart meters are susceptible to lightning surges and can be damaged. |
| Are smart meters protected from lightning surges? | No, unlike analog meters, smart meters do not have built-in surge protection and are not grounded. |
| What happens when a smart meter is hit by a lightning surge? | It can cause a fire, damage the meter, or lead to power supply issues. |
| How common are lightning surges? | Lightning is the most common source of power surges globally, but the frequency varies by region. |
| What can be done to protect against lightning surges? | Surge protectors or circuit breakers can be added to smart meters to mitigate the impact of lightning surges. |
| What are the concerns related to lightning surges and smart meters? | The potential for fires, damage to appliances, and overcharging of users are all concerns raised by the use of smart meters in areas prone to lightning strikes. |
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What You'll Learn
Smart meters may not have lightning surge protection
Smart meters are digital meters that have been rolled out by utility companies across the United States and globally. While some sources suggest that smart meters have some form of surge protection, others claim that they do not have the same level of protection as analog meters.
Analog meters are equipped with spark-gap technology, which has protected buildings from overvoltage conditions for decades. This technology can withstand lightning strikes without sustaining damage because there are no electronic components to wear out. In contrast, smart meters do not have this spark-gap technology and are instead fitted with a varistor, a voltage-dependent resistor, on the digital meter circuit board.
Repeated surges up to the maximum threshold of the meter varistor can weaken and eventually destroy it, allowing unregulated current to flow into the building. This can result in fires, as seen in several incidents in the United States. In 2017, Fire Chief Duane Roddy testified that he witnessed a smart meter ignite and arc at his home from a surge, causing the electricity to arc and melt the lines to his house. Similarly, in Pacific Grove, California, a nearby building's smart meter and panel caught fire when power was reconnected after being shut off by crews.
To address this issue, smart meter designers are incorporating power MOSFETs for power conversion functions and voltage pre-regulation. Power MOSFETs with voltage ratings of 1kV and higher are essential to accommodate wide AC input voltage ranges and protect against lightning surges. Additionally, designers may choose to use thermally protected varistors (TMOV) in smart meters to prevent overheating, smoke, and potential fires. However, it is unclear how widespread these additional protections are and whether they are standard across all smart meter designs.
In summary, while smart meters may have some level of surge protection, they may not have the same level of lightning surge protection as analog meters. The lack of spark-gap technology and the presence of electronic components that can be damaged by surges may make smart meters more susceptible to failure and fire hazards in the event of a lightning strike.
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Lightning strikes can damage smart meters
In 2011, 80 PG&E SmartMeters caught fire and burned out after a power surge in East Palo Alto, causing concern among residents and utilities officials about the safety of these devices. PG&E, however, maintains that SmartMeters are "just as robust" as analog meters and that any meter can be damaged by a power surge.
Smart meters do have some surge protection built-in, but it is not clear how effective this is against lightning strikes. In the case of a lightning strike, the surge protection may be overwhelmed, leading to damage to the meter and the building it is connected to.
There have been several reports of smart meters being damaged or destroyed by lightning strikes, with resulting fires and damage to homes. In one case, a fire chief testified that he witnessed a Smart Meter ignite and arc at his home from a surge. The electricity kept flowing and arcing, melting the lines to his house, and only stopped when the transformer and fuse on the pole blew and tripped.
It is important to note that lightning strikes are rare in many areas, so the likelihood of damage to smart meters from lightning surges is also relatively low. However, the potential for damage and the cost of repairs or replacements are still concerns that need to be addressed by utilities and homeowners alike.
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Lightning strikes can cause higher meter readings
In the case of a lightning strike, a surge of electricity can enter a building and damage the meter, causing it to read a higher electricity consumption than normal. This is what happened in the case of a house that experienced a direct lightning strike in July, which caused their electricity bill/usage to be far higher than any other month. Their daily average usage for July was 85 kWh, compared to a maximum of 56 kWh/day in previous months.
There are a few potential explanations for this. One possibility is that the lightning strike caused damage to the electrical system, which in turn caused an appliance to run constantly, resulting in higher electricity consumption. Another possibility is that the meter itself was affected by the lightning strike and began to read a surge in electricity. This has been disputed, with some arguing that meters do not work in this way and that it is highly unlikely for a lightning strike to impact the meter's readings.
To protect against lightning strikes and power surges, some smart meters may have built-in surge protection or "line isolation". However, this may not always be effective, and there have been several reports of smart meters catching fire or burning out after a power surge. As such, it is important for homeowners to be aware of the potential risks and take appropriate precautions to protect their homes and electrical systems from lightning strikes and power surges.
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Surge protectors can be added to smart meters
Smart meters are more susceptible to power surges than their analog predecessors. Lightning strikes are the most common source of power surges, and smart meters are not equipped with the same level of protection as analog meters. While some sources suggest that smart meters may have some level of built-in surge protection, it is not sufficient to prevent damage from lightning strikes.
Smart meters are vulnerable to power surges due to their sophisticated electronics, which require greater protection from electrical transients and power surges. This has led to concerns about the safety of smart meters, particularly in areas prone to lightning strikes.
To address these concerns, surge protectors can be added to smart meters to provide additional protection. Whole-house surge protectors are more effective than those built into power strips, as they can handle higher voltages and are designed to protect against prolonged periods of high voltage. These protectors can be rated at 13,000 joules or more and cost around $100, making them an inexpensive way to safeguard your home's electrical system.
While smart meter providers claim that their products are "just as robust" as analog meters, the reality is that any meter can be damaged by a power surge, regardless of its type. Adding a surge protector to a smart meter can help prevent damage not only to the meter itself but also to the home's electrical equipment and appliances. This can reduce the financial liability for the customer and the utility company in the event of a power surge.
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Smart meters can be damaged by power surges
Smart meters are indeed susceptible to damage from power surges. This vulnerability has raised concerns about the safety of smart meters, particularly in relation to lightning strikes, which are the most common source of power surges globally.
Smart meters are digital devices that allow consumers to monitor and adjust their power usage, offering potential cost savings. However, their electronic components make them vulnerable to power surges, which can disrupt the flow of data or even cause the meter to fail. In some cases, power surges have resulted in smart meters catching fire, leading to property damage and raising questions about liability for the resulting damage.
Industry experts have identified "catastrophic failure" as a unique failure mode for smart meters, which is not observed in analog electromechanical meters. This type of failure can result in the meter burning, melting, blackening, sparking, or even exploding. In one incident in East Palo Alto, 80 PG&E SmartMeters caught fire after a power surge, raising concerns among residents and utilities officials.
To address this issue, some have suggested adding a "surge protector" or "circuit breaker" to the smart meter to prevent damage during power surges. However, the responsibility for addressing and compensating for damage caused by power surges remains a contentious issue, with debate over whether the power supplier or the customer should bear the burden.
While smart meters offer benefits in terms of energy management and cost savings, the potential for damage from power surges, particularly in the form of lightning strikes, is a significant concern that needs to be adequately addressed to ensure the safety of homes and businesses.
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Frequently asked questions
Smart electric meters do not have the same surge protection as analog meters and are not connected to the ground. However, they do have a varistor, a voltage-dependent resistor that can protect against lightning surges up to a certain threshold.
If a lightning surge exceeds the varistor's maximum threshold, it can be weakened and eventually destroyed, allowing unregulated current to flow into the building, potentially causing fires or damage to appliances.
Surge protectors or circuit breakers can be added to smart meters to provide additional protection against lightning surges. These devices can help prevent damage to the meter and the building's electrical system.
