Winter Solar Production in Nova Scotia: Real Numbers

The most common question we get isn't about cost or financing — it's “what happens in winter?” The honest answer is: production drops, your bill doesn't go to zero from October to March, and that's fine. Net metering is built around exactly that seasonality.

Real numbers, sourced from public modeling

For an 8.4 kW south-facing array in HRM, NRCan PVWatts modeling and the University of Calgary's Solar Calgary cold-climate study together give a defensible monthly profile:

• December–January: 280–420 kWh/month
• February: 520–680 kWh/month
• March: 820–960 kWh/month
• April–September: 950–1,150 kWh/month
• October: 700–820 kWh/month
• November: 380–500 kWh/month

Roughly 65% of annual production happens April through September. Spring and fall shoulder months add another 20–25%. The three darkest months — December, January, February — contribute 12–15% combined. That ratio holds for most NS rooftops within a few percent.

The cold actually helpsper-kWh efficiency: silicon panels gain roughly 0.3–0.4% output per °C below 25°C (University of Calgary's Solar Calgary monitoring confirms this). Short days, not cold panels, are why winter totals dip.

So why doesn't winter ruin solar?

Net metering. Every excess kWh you push to the grid in summer becomes a credit on your NS Power account that rolls forward 12 months. By the time short days arrive, NS Power can apply that credit balance against lower-production bills. The system net-meters across the whole year, not month-to-month.

What about a battery?

Batteries are great for outages and resilience. They solve a different problem than seasonal net metering: keeping critical loads online when NS Power is down. A Powerwall-class battery stores roughly 13.5 kWh, so we size and quote it around backup goals, not as a replacement for annual crediting.

If resilience matters to your household, a battery can make sense. If your priority is annual bill offset, net metering handles the seasonal swing and battery backup can be added alongside it.

Snow on panels

Snow sheds faster than people expect — even diffuse light through a thin layer warms the panel enough for it to slide. Pitched roofs at 4/12 or steeper rarely need clearing. Flat or low-slope arrays may need a single rake-down after a heavy storm; we explain per-roof. Documented annual losses from snow cover in cold Canadian climates run 2–5% (University of Calgary's multi-year monitoring data), not the 20–30% homeowners often imagine.