Solar Panels Not Working in Spokane, Washington? Here's What to Check

If your solar panels aren't producing as expected in Spokane, Washington, you're not alone. Many homeowners in this area face unique challenges that can silently reduce energy output. Here's what you need to know about solar performance in Spokane — and what to do about it.

Understanding Solar Production in Spokane

Spokane receives approximately 2300 hours of sun per year, which is moderate — your solar resources are average for the US for a US city. A typical 6 kW system in Spokane should produce around 978 kWh per month on average.

However, this is an average. Your actual production varies significantly by season, weather patterns, and system configuration. Spokane has moderate seasonal temperature swings. Spring and fall can produce surprising variations as the sun angle changes rapidly. Winter production drops significantly due to shorter days and lower sun angles, which is completely normal.

Local Weather and Climate Factors in Spokane

Four distinct seasons. Winter production is 30-50% lower than summer due to lower sun angle and shorter days. This is completely normal and not a sign of malfunction.

Spring and fall variations. Rapid seasonal changes can create unexpected production patterns as sun angles shift quickly.

Common Issues for Spokane Solar Owners with Avista

In Spokane, we see several recurring problems that cost homeowners money:

• Seasonal production variance. Your winter production in Spokane may be 40-60% lower than summer. If you're comparing all months equally, you might think something's broken when it's actually normal.
• Shading from trees and buildings. As seasons change, sun angles shift. Morning or afternoon shade that isn't a problem in summer could significantly impact spring and fall production.
• Seasonal production swings from winter to summer This is particularly relevant in Spokane given our local climate patterns.
• Inverter or optimizer performance degradation. Over time, hardware can develop efficiency losses. If your system is more than 5 years old, this could account for 10-15% production loss.
• Grid voltage or utility interconnection issues. Avista occasionally implements grid protection settings that limit solar export during high-production periods.

Is Your Spokane System Actually Underperforming?

Many homeowners see lower-than-expected production numbers and assume something is broken. But without a baseline for comparison, you can't really know. Here's what to check:

1. Compare to your installer's projections. Your original solar proposal should include a production estimate. Compare your actual output to the "expected production" number for your system size and location.
2. Account for seasonal variation. Don't compare January to July. Instead, compare this January to last January, or this month to the historical average for this month in Spokane.
3. Check your monitoring app regularly. Most homeowners glance at production data maybe twice a year. If a problem has been developing for 3-6 months, you won't know until your electric bill arrives.
4. Look for sudden drops, not gradual changes. A system that produces 10% less than last year might just be aging. A system that drops 30-50% overnight suggests a hardware failure.

What Spokane Solar Owners Should Do

If you live in Spokane and want to ensure your solar system is performing at its best:

1. Establish a production baseline. Your first month is NOT a baseline for comparison. Use 3-6 months of data to understand your average production pattern. Once you know what's normal for Spokane, you can spot unusual drops.
2. Monitor seasonally, not monthly. Don't expect January production to match July. Instead, compare January to January, and understand that summer production should be 2-3x winter production in this area.
3. Use SolarDoctor to track health over time. A simple health score that accounts for Spokane's location, season, and system size tells you instantly if something needs attention.
4. Schedule preventative maintenance annually. Have a solar technician inspect your system once per year, preferably in spring. They can catch loose connections, degraded seals, and early warning signs before they become expensive failures.
5. Clean your panels appropriately for Spokane's climate. Panels often self-clean with regular rain. Schedule cleaning every 18-24 months or if you notice production drops.

The Real Cost of Not Monitoring

A typical 8 kW system that's underperforming by 20% (due to a failed inverter, string inverter issue, or optimizer failure) costs you roughly $30-50 per month in lost production. Over a year, that's $360-600 — more than the cost of a service call.

If the problem goes unnoticed for 18 months, you've lost over $900 in electricity production. The longer it goes, the worse it gets. This is exactly why continuous monitoring matters.

Getting Your Spokane System Back to Healthy Production

If you suspect your system is underperforming:

1. Start with SolarDoctor to get a baseline health score. It takes 2 minutes and works with any SolarEdge system.
2. If your health score is below 75, schedule a service technician to inspect your system. Bring your SolarDoctor report — it shows the production gap clearly.
3. Common fixes include replacing a failed power optimizer, cleaning panels, addressing loose electrical connections, or updating inverter firmware.
4. Once repairs are made, use SolarDoctor to verify that your health score recovers to the 90-110 range.