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Powering an Off-Grid Lakeside RV: Solar in the Forest Shade · Boondocking Tips: Off-Grid Camping, RV Travel & Van Life

• 0:00
  SPEAKER_00: Powering an off-grid lakeside RV, solar in the forest shade camping by a quiet lake under a cathedral of trees is a dream.
• 0:09
  SPEAKER_00: Until you realize your solar panels barely see the sun.
• 0:12
  SPEAKER_00: Dense tree canopy and morning fog can cut incident sunlight dramatically, forcing boondockers to rethink their solar setup.
• 0:21
  SPEAKER_00: By understanding how shade and diffuse light affect PV output, and by planning smart panel placement and battery storage, even a shaded lakeside RV can achieve reliable off-grid power.
• 0:33
  SPEAKER_00: This guide analyzes solar harvest under forest canopy, compares fixed rooftop versus portable panels, and covers tilt, water reflections, battery choices, load planning, and safety for an off-grid RV in a humid lakeside setting.
• 0:48
  SPEAKER_00: Solar harvest under forest canopy.
• 0:50
  SPEAKER_00: In a forested lakeside campsite, shade and fog are the enemies of solar generation.
• 0:56
  SPEAKER_00: Tree cover intercepts direct sunlight, and low clouds or mist scatter it.
• 1:01
  SPEAKER_00: Although solar panels can still produce under cloud cover, output is much lower.
• 1:06
  SPEAKER_00: One PV blog notes that on overcast or foggy days, panels may yield only 10 to 25% of their clear sky output.
• 1:14
  SPEAKER_00: In heavy morning fog or thick tree shade, plan on roughly a quarter of your panel's rated power.
• 1:20
  SPEAKER_00: Shade is especially pernicious because a single darkened cell strings can drag down the whole panel.
• 1:25
  SPEAKER_00: Studies of residential PV systems show significant power loss even with partial canopy shading.
• 1:31
  SPEAKER_00: One review found that a relatively small shaded area, e.g.
• 1:35
  SPEAKER_00: 20% shade, leads to noticeable dips in daily energy yield.
• 1:39
  SPEAKER_00: In practice, expect overall insulation under dense forest canopy to be far below open sky values.
• 1:46
  SPEAKER_00: A U.S.
• 1:47
  SPEAKER_00: Forest Service primer on Solar and Woods notes that sunlight under trees follows an exponential drop-off, with direct sun nearly zero and only diffuse light reaching the understory.
• 1:58
  SPEAKER_00: In broad terms, a sunny midsummer day at noon, 1000 W meters square direct, might translate to only a few hundred W meters square diffuse light in deep shade.
• 2:07
  SPEAKER_00: However, even scattered daylight adds up.
• 2:10
  SPEAKER_00: PV cells respond to diffuse photons, so you'll get some current.
• 2:14
  SPEAKER_00: In fact, panels make some power in low light, roughly 10 to 25% of peak, according to one manufacturer's guide.
• 2:22
  SPEAKER_00: To quantify your expected yield, it helps to monitor a sample day's output once on site.
• 2:27
  SPEAKER_00: For modeling, assume that bright sun hours, peak noon, are cut in half or more after dawn until the canopy opens.
• 2:34
  SPEAKER_00: For example, if an open-air 200W panel yields about 1 kilowatt hour per day at this location, under forest shade, you might only get 300 to 500 watt hours per day.
• 2:46
  SPEAKER_00: Actionable tip.
• 2:47
  SPEAKER_00: If possible, cite your RV and panels where the canopy opens up by late morning.
• 2:52
  SPEAKER_00: Sometimes roads or clearings at Lake Edge have less shade.
• 2:56
  SPEAKER_00: Even a few extra hours of sun above the trees can double your generation.
• 3:00
  SPEAKER_00: Portable panels can be moved to sunlit spots, fixed roof versus portable ground panels.
• 3:06
  SPEAKER_00: For an RV, solar panels are often roof-mounted or portable ground, or a mix of both.
• 3:12
  SPEAKER_00: Each has trade-offs.
• 3:14
  SPEAKER_00: A recent analysis found that despite a portable panel's convenience, fixed panels generally outproduce them.
• 3:20
  SPEAKER_00: A 100-watt portable module at typical 18 to 22% efficiency often delivers only 80 to 90 watts peak because it lies flat and heats up, yielding about 0.4 to 0.45 kilowatt hours per day under strong sun.
• 3:36
  SPEAKER_00: In contrast, a 400-watt fixed tilted panel runs nearer 360 to 380 watts peak, delivering about 1.6 to 1.8 kilowatt hours per day under optimal conditions.
• 3:48
  SPEAKER_00: That's roughly four times the daily energy for four times the panel area, thanks to better orientation, cooling, and higher efficiency cells.
• 3:57
  SPEAKER_00: Why the disparity?
• 3:58
  SPEAKER_00: Portable panels heat up quickly and are hard to keep perfectly aimed.
• 4:02
  SPEAKER_00: The study noted portable panels can reach 65 to 75 degrees Celsius on a 25-degree temperature day, whereas a ventilated roof panel stays closer to 45 to 55 degrees Celsius.
• 4:14
  SPEAKER_00: Each degree of extra heat cuts efficiency by 0.4 to 0.5%.
• 4:20
  SPEAKER_00: Portables also usually sit flat, missing roughly 15 to 20% of sunlight versus a tilted panel.
• 4:27
  SPEAKER_00: By contrast, fixed arrays can be angled toward the sun and benefit from backside cooling and even higher grade monocrystalline cells.
• 4:36
  SPEAKER_00: All told, the fixed panels yield was measured at about 87% of nameplate versus only around 45 to 90% for the portable, depending on conditions.
• 4:50
  SPEAKER_00: MPPT charge controllers.
• 4:52
  SPEAKER_00: Whether fixed or portable, use an NPPT maximum powerpoint tracking controller.
• 4:59
  SPEAKER_00: MPPTs dynamically adjust to extract peak wattage from panels under changing light.
• 5:06
  SPEAKER_00: This is crucial under partial shade or fog.
• 5:09
  SPEAKER_00: NPPT will find the sweet spots in the IV curve that produce the best power.
• 5:15
  SPEAKER_00: In practice, an MPPT charger starting at 12 to 16 volts input can harvest far more than a simple PWM regulator would.
• 5:25
  SPEAKER_00: For example, if morning haze provides only diffuse light, MPPT can still capture whatever current is available.
• 5:33
  SPEAKER_00: Whereas non-MPPT systems risk logging constant partial charge that can damage lead batteries, sulfation.
• 5:41
  SPEAKER_00: Portable versus panel count.
• 5:44
  SPEAKER_00: It's common to supplement a small roof array with one or two portable foldable panels.
• 5:50
  SPEAKER_00: This can significantly increase total power on sunny days.
• 5:54
  SPEAKER_00: For instance, adding a 100-watt portable in direct sun set up manually each morning effectively adds about 0.4 to 0.5 kilowatt hours per day extra.
• 6:06
  SPEAKER_00: If your roof only has 200 watts installed, this easy addition can boost daily harvest by 50%.
• 6:14
  SPEAKER_00: The key is placement.
• 6:16
  SPEAKER_00: Move the portable into full sun each day.
• 6:18
  SPEAKER_00: Keep it tilted with a stand and avoid local shade, like parked vehicles or trees.
• 6:24
  SPEAKER_00: Panel placement and tilt.
• 6:26
  SPEAKER_00: Water, glare, and albedo.
• 6:29
  SPEAKER_00: Near water.
• 6:30
  SPEAKER_00: Placing panels lakeside can have benefits.
• 6:33
  SPEAKER_00: Open water acts like a reflective surface, especially at low sun angles.
• 6:38
  SPEAKER_00: A still lake can reflect up to 10 to 90% of early or late sunlight, glinting effect, depending on sun altitude.
• 6:46
  SPEAKER_00: This frresnal reflection can boost a panel's rear or side illumination.
• 6:51
  SPEAKER_00: In practice, casual studies of bifacial, double-sided modules show that typical ground reflectivity, around 10 to 15% for grass, adds about 5-8% more energy on the backside.
• 7:04
  SPEAKER_00: Lake water reflectivity at midday is moderate, roughly similar to dark soil, but at sunrise or sunset it spikes.
• 7:12
  SPEAKER_00: Thus a panel on the shore might get a small percentage gain from water albedo, although most monofacial panels see little rear side light.
• 7:20
  SPEAKER_00: Tilt angle.
• 7:21
  SPEAKER_00: Fixed and portable panels both benefit from tilting.
• 7:25
  SPEAKER_00: The ideal tilt depends on latitude and season.
• 7:28
  SPEAKER_00: Roughly equal to the latitude is a common rule of thumb.
• 7:31
  SPEAKER_00: Many RV boondockers leave panels flat in summer.
• 7:35
  SPEAKER_00: One guide notes that across most of the US, you can leave panels flat during summer and still receive plenty of solar energy.
• 7:43
  SPEAKER_00: However, tilting toward the sun, even seasonally, can boost charge.
• 7:48
  SPEAKER_00: For example, a simple rule for winter is tilt roughly equal to latitude times 0.9 plus 24 degrees.
• 7:56
  SPEAKER_00: For a 40-degree north latitude campsite in winter, that works out to about 60 degrees tilt, which packs more winter sun onto the module.
• 8:05
  SPEAKER_00: A tilt stand, or L bracket, lets you adjust panels daily or seasonally.
• 8:10
  SPEAKER_00: Even a small tilt helps keep panels clean.
• 8:14
  SPEAKER_00: Near a lake, pollen, dirt, or bird droppings can stick to flat panels.
• 8:18
  SPEAKER_00: An angle of at least 10 to 15 degrees allows most rain to rinse debris off.
• 8:24
  SPEAKER_00: In high humidity camps by forests or water, keeping panels angled also reduces stagnant water pooling, which can scratch or leak.
• 8:33
  SPEAKER_00: Glare and orientation.
• 8:34
  SPEAKER_00: At a lakeside RV park, you may worry about blinding neighbors or boaters with reflected light.
• 8:40
  SPEAKER_00: In practice, solar panel antireflective coatings and typical tilt send most light upwards, above eye level, during daylight.
• 8:49
  SPEAKER_00: The worst glare is around sunrise/slash sunset, when you can simply adjust panel orientation away from heavily trafficked angles.
• 8:57
  SPEAKER_00: It's wise to position panels so they don't directly face roads or nearby cabins.
• 9:02
  SPEAKER_00: A general tip: park your RV so the panels face south in the northern hemisphere when you settle for the day.
• 9:09
  SPEAKER_00: One RV guide stresses orienting the RV so the solar side is southward from maximum daily sun.
• 9:16
  SPEAKER_00: It even suggests parking curbside facing south if your fridge is on the street side.
• 9:21
  SPEAKER_00: That way the fridge stays northward cooler and panels face true south.
• 9:25
  SPEAKER_00: Whenever possible, position panels to avoid morning shade and to maximize their southern exposure.
• 9:34
  SPEAKER_00: Battery choices LAFE PO4 versus AGM in humid conditions.
• 9:40
  SPEAKER_00: Choosing the right battery chemistry is critical for lakeside reliability.
• 9:45
  SPEAKER_00: LAFE PO4, lithium iron phosphate batteries have become popular for off-grid, but AGM absorbent glass mat lead acid are still common.
• 9:56
  SPEAKER_00: In humid or marine-like environments, LAFE PO4 generally outperforms AGM in longevity and moisture tolerance.
• 10:05
  SPEAKER_00: Key differences cycle life and usable capacity.
• 10:09
  SPEAKER_00: LATHE PO4 can often endure 2,000 to 5,000 cycles, life measured to 80% capacity, whereas AGM is typically limited to 300 to 500 cycles.
• 10:22
  SPEAKER_00: Moreover, a 100 amp hour lathe PO4 battery can use nearly 100% of its capacity safely, about 12.8 volts nominal, whereas AGM should only be drawn to about 50% depth of discharge to avoid sulfation.
• 10:38
  SPEAKER_00: In practice, this means one 100 amp hour lathe P04, about 1200 watt hours usable, replaces roughly two 100 amp hour AGMs, which only yield about 600 watt hours usable.
• 10:51
  SPEAKER_00: Detailed comparisons show LATHE PL4 delivers two times to three times the usable energy for similar amp hour ratings, making it more compact and lightweight.
• 11:02
  SPEAKER_00: Roughly one half weight for same usable energy.
• 11:06
  SPEAKER_00: Humidity corrosion.
• 11:07
  SPEAKER_00: LATHE PO4 cells are sealed, usually IP54-IP67 rated, and do not off-gas in normal operation, so they handle humid air and tilt well.
• 11:18
  SPEAKER_00: In fact, a recent battery comparison notes LAFE PO4 units are often IP67 sealed and saltwater ready for marine use.
• 11:28
  SPEAKER_00: By contrast, AGNs, while sealed, still vent tiny amounts of hydrogen-oxygen when overcharged, and their fiberglass mat can harbor moisture.
• 11:38
  SPEAKER_00: High humidity accelerates lead acid corrosion.
• 11:41
  SPEAKER_00: A moisture study rated LAFE P04 batteries as having very high moisture tolerance, while AGMs only medium.
• 11:48
  SPEAKER_00: The biggest risk for LAFE PO4 in dab camps is corrosion of its metal housing.
• 11:53
  SPEAKER_00: Aluminum cases can oxidize.
• 11:56
  SPEAKER_00: Whereas for AGM, the risk is surface leakage currents and lead plate corrosion, green oxide forming on posts.
• 12:03
  SPEAKER_00: In practice, LAFE PL4 terminals and bus bars should still be inspected and coated, e.g., with petroleum jelly to prevent corrosion, but they will far outlast an AGM in a muggy lakeside climate.
• 12:16
  SPEAKER_00: Charging behavior.
• 12:17
  SPEAKER_00: LATHE PO4 charges faster, often 2-3 hours for full charge with an MPPT, with about 95 to 98% efficiency compared to AGM, 9 6 to 8 hours, 80 to 85%.
• 12:31
  SPEAKER_00: Importantly, lathe P04 accepts partial charging without harm, whereas leaving an AGM only partially charged, common in short sundays, causes sulfation that degrades it.
• 12:42
  SPEAKER_00: If you expect gray, foggy mornings and only hit full sun a few hours at midday, lathe P04's forgiving charging will keep it healthier.
• 12:51
  SPEAKER_00: Do note, lathe P04 must not be charged below freezing without special care.
• 12:57
  SPEAKER_00: But if you're lakeside in summer, that likely isn't a concern.
• 13:01
  SPEAKER_00: Both battery types must be fused and mounted securely.
• 13:05
  SPEAKER_00: LAFE P04 has very low risk of thermal runaway.
• 13:08
  SPEAKER_00: It's a very stable chemistry.
• 13:11
  SPEAKER_00: AGMs have a risk of hydrogen gas when overcharging.
• 13:14
  SPEAKER_00: Make sure AGM boxes are vented if tightly enclosed.
• 13:18
  SPEAKER_00: LAFE P04 usually include a built-in battery management system, BMS, that protects against overvoltage, overcurrent, and low temperature charging.
• 13:28
  SPEAKER_00: Still, both should be secured to prevent tipping in a rolling RV, and terminals should be covered or insulated.
• 13:34
  SPEAKER_00: Given the moist lakeside, LAFE P04 is generally the better choice for durable, maintenance-free storage.
• 13:41
  SPEAKER_00: It is heavier on initial cost, about 2 to 3 times the$mh of AGM, but amortizes that with long life.
• 13:49
  SPEAKER_00: AGM may suit if budget is very tight and use is extremely light and infrequent.
• 13:54
  SPEAKER_00: If using AGM, plan to coat terminals with anti-corrosion spray and check water levels if flooded type often, as humidity accelerates self-discharge and decay.
• 14:05
  SPEAKER_00: Load planning and autonomy.
• 14:07
  SPEAKER_00: Avoid surprises by doing a load audit.
• 14:09
  SPEAKER_00: Make a simple chart of every appliance's wattage, usage hours, and daily energy need.
• 14:14
  SPEAKER_00: For example, refrigerator, 12 volt compressor.
• 14:18
  SPEAKER_00: Modern 50 to 60 liter 12 volt fridges typically use 0.3 to 0.6 kilowatt hours day.
• 14:25
  SPEAKER_00: Older absorption fridges or larger units may use up to 1.0 to 1.1 4 kWh day.
• 14:33
  SPEAKER_00: Ventilation fans.
• 14:35
  SPEAKER_00: Typical 12-volt fans are 10 to 25 W each.
• 14:39
  SPEAKER_00: If you run one 25W fan for 8 hours, that's 200 WHF.
• 14:45
  SPEAKER_00: Water pump, a 12-volt pump, draws 50W at peak.
• 14:50
  SPEAKER_00: If it runs intermittently, e.g.
• 14:52
  SPEAKER_00: one hour total per day, that's 50 WHF.
• 14:56
  SPEAKER_00: LED lights, a 5W LED bulb for 4 hours, 20 HF.
• 15:01
  SPEAKER_00: But four of those, 80 HF, still minor.
• 15:05
  SPEAKER_00: Electronics charging.
• 15:07
  SPEAKER_00: Phones laptops can add 100 to 200 WAPS per day if heavily used.
• 15:12
  SPEAKER_00: E.g., two laptops for 4H.
• 15:15
  SPEAKER_00: As an example, a moderate Boondocker's daily tally might be 500 to 800 WAPS.
• 15:21
  SPEAKER_00: The fridge is usually the single biggest consumer, a 400 to 600 WAPS.
• 15:27
  SPEAKER_00: Fans and pumps often combine for 200 WAPS.
• 15:30
  SPEAKER_00: Lights and devices may add another 100 to 200 WAPS.
• 15:35
  SPEAKER_00: If you heat water or cook off-grid, those are additional loads, often not electric in RVs.
• 15:41
  SPEAKER_00: With a load audit in hand, compute battery autonomy.
• 15:45
  SPEAKER_00: Autonomy means how long your battery can sustain loads in zero sun.
• 15:50
  SPEAKER_00: Use usable battery capacity post-DOD.
• 15:53
  SPEAKER_00: For instance, a 200AH life APO4, 12.8 V, yields 2560WAPS.
• 16:01
  SPEAKER_00: At 80% discharge safe, that's 2050WAPS usable.
• 16:06
  SPEAKER_00: If your load is 700W per day, that battery gives 2.9 days autonomy.
• 16:12
  SPEAKER_00: To be conservative, plan for 2-3 cloudy days of storage.
• 16:16
  SPEAKER_00: In practice, sizing 3-5 days of house loads is wise in a foggy forest.
• 16:21
  SPEAKER_00: For AGM, double those amp hours, since only 50% DOD is safe.
• 16:26
  SPEAKER_00: Example autonomy.
• 16:28
  SPEAKER_00: Suppose 700 WAPS per day use, 3 days of autonomy, need 2100 WAPS usable.
• 16:33
  SPEAKER_00: You could achieve this with 175 HH, Life APO4, 12E, usable 2100 WAPS, or 350 HHA, 12V, exploiting 50%, also 2100 WAPS out of 4200 WAPS total.
• 16:49
  SPEAKER_00: If weight is a concern and cost allows, LifeAPO4 is far lighter.
• 16:55
  SPEAKER_00: Remember to include inverter efficiency if using AC loads.
• 16:58
  SPEAKER_00: A 90% efficient inverter effectively requires 10% more battery energy than your AC meter indicates.
• 17:06
  SPEAKER_00: Safety, corrosion, and security, corrosion and weatherproofing, lakeside humidity and occasional splashes mean everything must be rugged.
• 17:13
  SPEAKER_00: Use marine RAID materials where possible.
• 17:16
  SPEAKER_00: Stainless steel or aluminum racking, galvanic corrosion occurs if dissimilar metals touch.
• 17:21
  SPEAKER_00: Protect all electrical connections.
• 17:23
  SPEAKER_00: Use MC4 PV connectors rated IP67 and keep junction boxes elevated or sealed against moisture.
• 17:31
  SPEAKER_00: For battery banks and controllers, choose boxes that shed water, apply silicone sealant to any bulkhead entries.
• 17:37
  SPEAKER_00: A thin film of dielectric grease on battery terminals and panel wires can deter corrosion.
• 17:43
  SPEAKER_00: Inspect all hardware periodically for rust or oxidation.
• 17:46
  SPEAKER_00: If panels sit on foldable stands, rinse them off if they get sprayed with water or mud.
• 17:53
  SPEAKER_00: Tilt panels sufficiently so rainwater drains off immediately, at least 15 degrees if practical, to avoid stagnant water and algae growth.
• 18:01
  SPEAKER_00: Cable sizing.
• 18:02
  SPEAKER_00: In 12 volt systems, voltage drop is a big concern on long runs.
• 18:07
  SPEAKER_00: A portable panel placed far from the RV's battery may produce less current if the wire is thin.
• 18:12
  SPEAKER_00: Use thick gauge cable, e.g.
• 18:14
  SPEAKER_00: 8AWG or 6mm squared, for any run over a few meters and multi-amp flows.
• 18:20
  SPEAKER_00: As a rule of thumb, a 10A draw over 10 feet of 12AWG wire yields 3% voltage drop.
• 18:27
  SPEAKER_00: But double the length or have the gauge and the drop doubles.
• 18:30
  SPEAKER_00: Many ground mount designs use 6mm squared, 10 AWG, to hold drop under 1 to 2%.
• 18:37
  SPEAKER_00: Always fuse each string close to the source and never rely on the mounting to ground for return.
• 18:42
  SPEAKER_00: Use the proper negative ground wire.
• 18:45
  SPEAKER_00: Lightning and tilt safety.
• 18:47
  SPEAKER_00: A tilted panel on a roof rack can act like a small lightning target.
• 18:50
  SPEAKER_00: If a storm is imminent, either lay panels flat or disconnect them.
• 18:54
  SPEAKER_00: Remove cables or actuate any disconnect switch.
• 18:57
  SPEAKER_00: Do not touch panels or wiring in a storm.
• 19:00
  SPEAKER_00: Grounding is complex for portable rigs, but ensure your chassis is properly grounded to minimize potential differences.
• 19:08
  SPEAKER_00: Never coil cables loosely, risk of inductive kick, and always shut off the system before servicing.
• 19:14
  SPEAKER_00: Theft prevention.
• 19:15
  SPEAKER_00: Portable panels are attractive targets.
• 19:17
  SPEAKER_00: While there's no foolproof solution, you can deter opportunistic theft.
• 19:21
  SPEAKER_00: One recommendation is to secure panels with a steel cable lock, like a retractable toy lock, threading through the panel's handle and around the RV frame.
• 19:33
  SPEAKER_00: Some campers suggest placing a fake dog or a remote camera near conspicuous panels and always keeping them in sight if possible.
• 19:42
  SPEAKER_00: When leaving camp for extended time, stow foldables away in the RV rather than leaving them unattended outside.
• 19:50
  SPEAKER_00: At night, foldable panels should be secured in storage or locked up.
• 19:56
  SPEAKER_00: Lastly, mark your panels subtly, engrave your name or license, so any stolen unit can be identified.
• 20:03
  SPEAKER_00: Conclusion, a forested lakeside setting poses real challenges for solar power.
• 20:09
  SPEAKER_00: But with smart choices, your RV can sit from the sun even in shade and mist.
• 20:15
  SPEAKER_00: Use MPPT controllers, position panels for maximum open sky exposure, even moving portables daily, and tilt them for better efficiency and self-cleaning.
• 20:26
  SPEAKER_00: Exploit any water reflection sensibly and be mindful of glare.
• 20:31
  SPEAKER_00: Choose Deep Cycle Life PO4 batteries for their long life and humidity resilience, and do a careful load audit to size your battery bank for several cloudy days.
• 20:42
  SPEAKER_00: Always protect electrical gear from corrosion, properly gauge and fuse cables, and secure portable arrays against theft.
• 20:50
  SPEAKER_00: With these measures, your RV can enjoy the serenity of the forest and lake, and still keep the lights on after dusk.
• 20:59
  SPEAKER_00: All links to sources are available in the text version of this article.
• 21:04
  SPEAKER_00: You can find the full article at boondocking.tips.
• 21:08
  SPEAKER_00: Thanks for listening.
• 21:09
  SPEAKER_00: For more research driven boondocking guides, off grid camping tips, RV travel advice, and van life strategies, visit boondocking.tips.
• 21:19
  SPEAKER_00: That's boondocking.tips for the full written research and new camping updates.