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Key takeaways
- Look at the sun's whole path before you park, not just where it is right now.
- Shade is the biggest loss, and it moves. A spot that is sunny at 10 a.m. may be shaded by 2 p.m.
- Direction matters more for tilted or portable panels than for flat roof panels, and a low winter sun makes the whole site matter more.
- Follow your RV manual on leveling, especially for refrigerators and slide-outs. Never give that up for solar.
- When the site is shady, put a portable panel in the sun and keep the rig where it is comfortable and safe.
Read the sun's path before you park
A site that feels bright at arrival can be shaded for half the day. The sun rises in the east, crosses the southern half of the sky in the Northern Hemisphere and sets in the west, and the arc is lower and shorter in winter. The US Department of Energy's explanation of solar radiation notes that radiation at a location depends on geography, time of day, season, local landscape and weather, and that winter rays are more slanted than summer ones. For parking, the landscape part is what you control.
Before you commit, stand where the RV will sit and look around the compass. Where are the trees, buildings, ridges and neighboring rigs? Which of those lie to the south, east and west, and how tall are they compared with where the sun will be? A line of trees on the south side is a bigger problem than the same trees on the north.
A phone compass and a sun-path app, or a simple walk at different times of day, give you the same information without any equipment. If you arrive late, make a note of what you see in the morning and move if you need to. Our guides to partial shading explain why even small shadows can cost more output than you might expect.
Direction and slope
For panels lying flat on a roof, the direction the RV faces matters less than people think, because flat panels see the sky roughly evenly. It matters more when panels are tilted, when you use portable panels, or when one side of the roof is shaded by your own awning, slide-out or nearby obstacles. In those cases, face the panels, or the long side of the roof if the panels run lengthwise, toward the open sky.
Slope matters too. If the ground tilts your RV nose-up or nose-down, the roof panels tilt with it, which can help or hurt depending on where the sun is. Do not use this as a reason to park off level. Your RV manual sets leveling requirements, including for absorption refrigerators and slide-outs, and those come first. Use the shorter, more reliable fixes for solar instead:
- Choose a pad or pull-through spot that is already level and has open sky to the south.
- In winter, pick the spot with the clearest southern view, because the low sun is easily blocked.
- Use tilt mounts if you have them. See our tilt mount guide and winter tilt angle guide.
- Park so that your awning or slide-out does not throw a shadow across the panels at midday.
Your leveling tools matter here, because a rig that is level is also one you can park deliberately. A simple RV level makes the process quick.
Plan around moving shade
Shade is the biggest solar loss you can avoid. Because shadows move, a spot needs to be judged at three times of day.
| Time | What to check | What it means |
|---|---|---|
| Morning | Shadows from the east: trees, buildings, ridges | A late start means less total charging |
| Midday | Shadows from the south and from your own awning or roof gear | Midday is when most panels do their best work; shade here costs the most |
| Afternoon | Shadows from the west | Late shade cuts the top-up before evening |
Tree shade is the classic trap. A shaded campsite is cooler and pleasant, and it may cost you most of a day's charging. If you like the shade, weigh it against the battery plan, and consider a portable panel in a sunny clearing. Our suitcase panel guide has options.
Portable or suitcase solar panel
A portable panel lets you park where it is comfortable and still collect sun, by moving it as the shadows move. Match its connector and specs to your controller's manual before buying, and secure it against wind and passers-by.
You will need a cable to reach the panel. It has to suit the panel maker's connector and instructions, so follow them. See the extension cable guide.
Adjust for the season and the day
The same site works differently in June and December. In winter the sun is low, shadows are long and a tree that is harmless in summer can shade the roof most of the day. In summer the sun is high, so shade is shorter, but the heat is a reason to think about airflow.
Weather matters as well. The Department of Energy notes that weather can cut direct sunshine by anywhere from a small share on a clear, dry day to all of it under thick cloud. If a storm is coming, park for safety first. Do not park under dead branches or leaning trees, and read our guide on protecting panels from hail and tree limbs.
If you are planning around short winter days, see planning around December sun hours, and if snow is likely, see how to clear snow off panels safely.
A five-minute arrival routine
- Walk the pad and look at the whole horizon for trees, buildings and ridges.
- Decide where the sun will be at morning, midday and afternoon using a compass or app.
- Pick the level spot with the best southern exposure and a safe view overhead.
- Check your awning and slide-out shadows before you set the jacks or blocks.
- Put a portable panel in the clearing if the roof will be shaded.
- Check the controller or monitor in the morning to see whether the choice paid off, and adjust the next stop.
None of this requires new gear. A habit of looking before you park is what pays, and over a season it adds up. Keep a note of the best sites for the next visit.
Frequently asked questions
Which direction should I park my RV for solar panels?
For flat roof panels, direction matters less than shade. For tilted or portable panels, aim them toward the open sky, which in the Northern Hemisphere means the south.
Is shade or direction more important for RV solar?
Shade is usually the bigger loss, because shade on part of a panel can cut output more than you would expect. Direction matters more for tilted or portable panels.
Should I park off level to tilt my panels toward the sun?
No. Follow your RV manual on leveling, especially for refrigerators and slide-outs. Use tilt mounts or a portable panel instead.
How do I check for shade at a campsite?
Walk the site, look at the whole horizon and check where the sun will be in the morning, at midday and in the afternoon with a compass or sun-path app.
What if my campsite is too shady for solar?
Park where it is safe and comfortable and put a portable panel in a sunny spot, moving it as the shadows move.
Sources and verification
- US Department of Energy, Solar Radiation Basics: solar radiation at a location depends on geography, time of day, season, local landscape and weather; winter rays are more slanted; weather can reduce direct sunshine.
The general sun-path description (rising in the east, crossing the southern half of the sky in the Northern Hemisphere, setting in the west) is basic astronomy. No panel output, tilt-angle or sizing figures are given, since they depend on your equipment and location. For leveling, follow your RV manual. For any wiring for a portable panel, follow the panel and controller manuals and ask a qualified RV technician or electrician if you are unsure.