Winter Solar Production in Nova Scotia: Real Numbers

“What happens in winter?” is a fair question to ask about solar in Nova Scotia. The short answer: 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.

Rough numbers from solar modelling

For an 8.4 kW south-facing array in HRM, an illustrative modelled monthly profile looks something like this (your roof will differ):

• 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. Your roof's split will shift with its angle, direction, and shade.

The cold actually helps efficiency: silicon panels produce a little more from the same sunlight when they're cold, as the temperature coefficient on any panel datasheet shows. 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 and is applied to later bills. By the time short days arrive, NS Power can apply that credit balance against lower-production bills, and on January 1 what is left is applied to energy billed earlier that year. 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 often sheds faster than people expect: even diffuse light through a thin layer can warm the panel enough for it to slide. Steeper pitched roofs usually shed on their own. Flat or low-slope arrays may need a rake-down after a heavy storm; we explain per-roof. Snow does cost some production, but on most pitched arrays it's a small share of the year.