Londonderry, New Hampshire shows moderate potential for year-round solar energy generation, though with significant seasonal variation typical of its Northern Temperate Zone location. The area experiences its peak solar production during summer months at 5.72 kWh per day per kW of installed capacity, followed closely by spring at 5.37 kWh per day per kW.

Seasonal Performance Patterns

The location demonstrates a clear seasonal pattern that reflects the changing sun angles and weather conditions throughout the year. Summer and spring represent the most productive periods for solar generation, with both seasons delivering over 5 kWh daily per installed kW. Autumn production drops to 3.29 kWh per day per kW, while winter shows the lowest output at just 1.97 kWh per day per kW. For optimal year-round energy capture at this location, solar panels should be installed at a fixed tilt angle of 37 degrees facing south. This angle maximizes total annual production by accounting for the sun's varying elevation throughout the seasons and weighting the optimal angles based on actual solar irradiance potential.

Environmental and Weather Challenges

Several local factors in Londonderry, New Hampshire can significantly impact solar energy production. Snow accumulation during winter months poses the most substantial challenge, as heavy snow loads can completely block solar panels and dramatically reduce energy output during an already low-production season. The region's frequent winter storms and occasional ice formation can compound this issue. Deciduous tree coverage common in New Hampshire can create seasonal shading problems, particularly problematic during the high-production spring and summer months when trees are in full leaf. Additionally, the area's humid continental climate brings periodic heavy cloud cover and thunderstorms during summer months, which can temporarily reduce solar generation.

Preventative Installation Measures

To maximize energy production despite these challenges, several installation strategies prove effective:

• Install panels with adequate tilt (the recommended 37 degrees works well) to promote natural snow shedding
• Ensure sufficient spacing between panel rows to prevent snow accumulation and allow for safe cleaning access
• Conduct thorough shade analysis before installation to identify and avoid areas affected by tree shadows
• Consider ground-mounted systems in areas with heavy tree coverage to allow for better positioning away from shade
• Install monitoring systems to quickly identify performance issues caused by snow or debris accumulation

Regular maintenance becomes particularly important in this location, including periodic cleaning and snow removal when safe to do so. While winter production remains the lowest of all seasons, proper installation and maintenance can help ensure the system captures maximum available energy during the highly productive spring and summer months.

Note: The Northern Temperate Zone extends from 35° latitude North up to 66.5° latitude.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 4253 locations across the United States. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in the United States by location

Solar output per kW of installed solar PV by season in Londonderry

Seasonal solar PV output for Latitude: 42.8674, Longitude: -71.3793 (Londonderry, United States), based on our analysis of 8760 hourly intervals of solar and meteorological data (one whole year) retrieved for that set of coordinates/location from NASA POWER (The Prediction of Worldwide Energy Resources) API:

 

Ideally tilt fixed solar panels 37° South in Londonderry, United States

To maximize your solar PV system's energy output in Londonderry, United States (Lat/Long 42.8674, -71.3793) throughout the year, you should tilt your panels at an angle of 37° South for fixed panel installations.

As the Earth revolves around the Sun each year, the maximum angle of elevation of the Sun varies by +/- 23.45 degrees from its equinox elevation angle for a particular latitude. Finding the exact optimal angle to maximise solar PV production throughout the year can be challenging, but with careful consideration of historical solar energy and meteorological data for a certain location, it can be done precisely.

We use our own calculation, which incorporates NASA solar and meteorological data for the exact Lat/Long coordinates, to determine the ideal tilt angle of a solar panel that will yield maximum annual solar output. We calculate the optimal angle for each day of the year, taking into account its contribution to the yearly total PV potential at that specific location.

Seasonally adjusted solar panel tilt angles for Londonderry, United States

If you can adjust the tilt angle of your solar PV panels, please refer to the seasonal tilt angles below for optimal solar energy production in Londonderry, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 37° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
26° South in Summer	47° South in Autumn	58° South in Winter	36° South in Spring

Our recommendations take into account more than just latitude and Earth's position in its elliptical orbit around the Sun. We also incorporate historical solar and meteorological data from NASA's Prediction of Worldwide Energy Resources (POWER) API to assign a weight to each ideal angle for each day based on its historical contribution to overall solar PV potential during a specific season.

This approach allows us to provide much more accurate recommendations than relying solely on latitude, as it considers unique weather conditions in different locations sharing the same latitude worldwide.

Calculate solar panel row spacing in Londonderry, United States

We've added a feature to calculate minimum solar panel row spacing by location. Enter your panel size and orientation below to get the minimum spacing in Londonderry, United States.

Our calculation method

1. Solar Position:
   We determine the Sun's position on the Winter solstice using the location's latitude and solar declination.
2. Shadow Projection:
   We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle.
3. Minimum Spacing:
   We add the shadow length to the horizontal space occupied by tilted panels.

This approach ensures maximum space efficiency while avoiding shading during critical times, as the Winter solstice represents the worst-case scenario for shadow length.

Topography for solar PV around Londonderry, United States

Topographic Features Around Londonderry

The landscape surrounding Londonderry in southern New Hampshire is characterized by gently rolling hills and relatively modest elevation changes typical of the New England region. This area sits within the broader context of the White Mountain foothills, though the immediate vicinity features more subdued terrain compared to the dramatic peaks found further north in the state.

The elevation in and around Londonderry generally ranges from approximately 200 to 400 feet above sea level, with the terrain gradually rising as one moves westward toward the interior of New Hampshire. The topography consists primarily of low ridges interspersed with shallow valleys, creating a landscape that undulates gently rather than presenting steep or challenging slopes.

Several small streams and wetland areas dot the region, including portions of Beaver Brook and other minor waterways that have carved subtle valleys through the landscape over time. These water features contribute to the area's rolling character while also creating pockets of flatter terrain in the valley bottoms.

The soil composition reflects the region's glacial history, with areas of sandy loam mixed with rocky outcroppings and occasional ledge exposures. Much of the land has been historically cleared for agriculture or development, though mature forest still covers significant portions of the surrounding countryside.

Optimal Areas for Large-Scale Solar Development

The most promising locations for substantial solar photovoltaic installations in the Londonderry area would be the relatively flat to gently sloping agricultural fields and cleared areas that face south or southwest. These open spaces offer the dual advantages of minimal tree cover and favorable orientation for solar collection throughout the day.

Former agricultural lands that have been allowed to revert to grassland present particularly attractive opportunities, as they typically feature gentle slopes that can be easily accessed by construction equipment while providing good drainage. The cleared hilltops and ridge lines in the area, while slightly more elevated, often offer excellent exposure with minimal shading from surrounding vegetation.

Areas along the broader valley floors, particularly those that have been previously developed for farming, would be well-suited for large installations due to their relatively level terrain and existing access infrastructure. These locations typically require less site preparation and grading compared to more heavily forested or steeply sloped areas.

The southeastern portions of the region, where the land tends to be somewhat flatter and more open, would likely provide the most cost-effective development opportunities. These areas benefit from the combination of suitable topography and proximity to existing electrical infrastructure, which is crucial for connecting large-scale solar facilities to the regional power grid.

United States solar PV Stats as a country

United States ranks 2nd in the world for cumulative solar PV capacity, with 95,209 total MW's of solar PV installed. This means that 3.40% of United States's total energy as a country comes from solar PV (that's 26th in the world). Each year United States is generating 289 Watts from solar PV per capita (United States ranks 15th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in United States?

Yes, there are several incentives for businesses wanting to install solar energy in the United States. These include federal tax credits, state and local rebates, net metering policies, and renewable energy certificates (RECs). Additionally, many states have enacted legislation that requires utilities to purchase a certain amount of electricity from renewable sources such as solar.

Do you have more up to date information than this on incentives towards solar PV projects in United States? Please reach out to us and help us keep this information current. Thanks!

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Compare this location to others worldwide for solar PV potential

The solar PV analyses available on our website, including this one, are offered as a free service to the global community. Our aim is to provide education and aid informed decision-making regarding solar PV installations.

However, please note that these analyses are general guidance and may not meet specific project requirements. For in-depth, tailored forecasts and analysis crucial for feasibility studies or when pursuing maximum ROI from your solar projects, feel free to contact us; we offer comprehensive consulting services expressly for this purpose.

Helping you assess viability of solar PV for your site

Calculate Your Optimal Solar Panel Tilt Angle: A Comprehensive Guide

Enhance your solar panel's performance with our in-depth guide. Determine the best tilt angle using hard data, debunk common misunderstandings, and gain insight into how your specific location affects solar energy production.