PSPS Blackouts: How Solar + Battery Keeps Your Power On

Public Safety Power Shutoffs, or PSPS events, are California new normal. When wildfire risk is high, PG&E and other utilities proactively shut off power to reduce ignition risk. These outages last 24 to 72 hours on average, sometimes longer. If you live in a high-fire-risk zone, you can expect multiple PSPS events per year.

Grid-tie solar without batteries shuts down during PSPS. Federal safety rules require solar inverters to disconnect when the grid goes down, even if the sun is shining. The only way to keep power during PSPS is a battery backup system or a generator. Here is how solar battery systems handle PSPS events and why they outperform generators.

What Is PSPS and Who Gets Shut Off?

PSPS is a wildfire prevention measure. When weather conditions create high fire risk -- strong winds, low humidity, dry vegetation -- utilities shut off power to high-risk circuits. The goal is to prevent downed power lines or equipment failures from sparking wildfires.

PG&E uses a tiered risk map to decide which areas get shut off. Tier 2 and Tier 3 high-fire-threat districts are most likely to see PSPS events. This includes foothill and mountain communities, rural areas with dense vegetation, and regions with a history of destructive wildfires. Coastal and valley areas are lower risk but not immune.

PSPS notifications go out 24 to 48 hours in advance when possible, but sometimes utilities cut power with less notice if conditions deteriorate rapidly. Outages last until fire risk subsides and crews can inspect lines for damage. Restoration typically takes 24 to 72 hours, but some areas have been dark for a week or more after major wind events.

Why Grid-Tie Solar Shuts Off During PSPS

Most solar systems in California are grid-tie. They connect directly to the utility grid and feed excess power back through your meter. When the grid goes down, your inverter detects the loss of grid voltage and shuts off within milliseconds. This is required by federal anti-islanding rules to protect utility workers from live wires.

Even if your panels are producing power and the sun is shining, a grid-tie system without a battery goes dark during PSPS. You cannot run your lights, fridge, or HVAC. Your expensive solar array sits idle while you scramble for candles and coolers.

To keep power during PSPS, you need a battery system that can island from the grid. The battery stores solar energy during the day and delivers it when the grid is down. The inverter switches to off-grid mode, and your home keeps running independently.

How Solar Battery Systems Handle PSPS

A solar battery system detects when the grid goes down and switches to island mode within seconds. Your panels keep producing power. The battery stores excess energy. Your home runs on solar and battery, completely isolated from the dead grid.

During a multi-day PSPS event, the system cycles daily. The sun rises, panels produce power, you run daytime loads like HVAC and charge devices, and excess energy fills the battery. At night, the battery takes over. The next morning, the panels recharge the battery and the cycle repeats. As long as the sun rises, you keep running.

VoltSol systems are designed for this scenario. EG4 LiFePO4 batteries store 10 to 15 kWh, enough to cover nighttime HVAC, refrigeration, lights, and electronics. EG4 hybrid mini-splits run on DC solar during the day and battery power at night. Customers report staying comfortable and powered through week-long PSPS events without ever losing lights or climate control.

What Loads Can You Run During PSPS?

It depends on battery size and panel capacity. A VoltSol system with 4 kW of solar and 15 kWh of battery covers essential loads: mini-split heat pump, refrigerator, lights, TV, Wi-Fi, phone charging, and small electronics. Heavy loads like electric stoves, dryers, or well pumps require larger systems or temporary shutoff during outages.

Most customers prioritize comfort and communication during PSPS. Heating and cooling matter most. A mini-split heat pump uses 1 to 2 kW during operation, which a 4 kW solar array covers easily during the day. At night, the battery delivers 8 to 12 hours of runtime depending on usage.

If your system is sized conservatively, you reduce discretionary loads during PSPS. Skip the laundry. Cook with a camp stove. Turn off unused lights. This stretches battery runtime and keeps essentials running longer. Solar recharges the battery the next day, and you are back to normal operation.

PSPS Runtime: Real-World Examples

A VoltSol customer in Grass Valley reported a 72-hour PSPS event in October 2025. The system included 4 kW of solar, a 15 kWh EG4 battery, and a single-zone mini-split. During the outage, daytime loads included the mini-split, refrigerator, lights, and electronics. Nighttime loads included the mini-split for a few hours and the refrigerator overnight.

The system ran continuously for the full 72 hours without running out of power. Daytime solar production exceeded usage and recharged the battery each day. The customer reported no discomfort, no spoiled food, and no need for a generator. When the grid came back online, the system switched back to grid-tie mode automatically.

Another customer in Sonora ran an off-grid VoltSol system through a 96-hour PSPS event in September 2025. The system covered a mini-split, refrigerator, well pump, and lights. The well pump was the heaviest load at 1.5 kW during startup. The customer manually limited well pump use to twice daily and stretched battery runtime. Solar recharged the battery fully each day despite cooler fall weather.

PSPS vs Generator: Why Battery Wins

Generators work during PSPS, but they require fuel, create noise, and emit exhaust. During multi-day events, you burn through gasoline or propane fast. Gas stations may be closed or out of fuel. You also deal with refueling every 6 to 10 hours and the constant engine noise.

Solar battery systems need no fuel. They recharge from the sun every morning. They run silently. No carbon monoxide risk. No trips to the gas station. No waking up at 3 AM to refill the tank. For PSPS events that last 48 to 96 hours, solar battery systems are far more convenient and reliable than generators.

Many customers keep a small backup generator for rare worst-case scenarios like a week-long winter storm with no sun. But for typical PSPS events -- sunny or partly cloudy weather, 24 to 72 hour duration -- solar battery systems handle the job effortlessly.

Can You Add Battery to Existing Grid-Tie Solar?

Yes, but it depends on your inverter. Some grid-tie inverters support battery add-ons through DC-coupling or AC-coupling. Others do not, and you need to replace the inverter or add a separate battery inverter. VoltSol can assess your existing system and recommend retrofit options.

If you have an older grid-tie system without battery capability, the most cost-effective path is often to install a separate off-grid system for critical loads. This gives you backup power for HVAC and essentials without touching your existing grid-tie array. You keep both systems and let the grid-tie handle whole-house daytime loads while the off-grid system covers comfort and resilience.