RV Solar in 2025: The Most Liberating Upgrade You Can Make
Solar-powered RVing changes what’s possible on the road. No more hunting for campgrounds with hookups. No more idling the generator at 7am in a quiet campground. No more $30/night fees just to have electricity. A well-designed RV solar system pays for itself in hookup fees avoided within 2–3 years and gives you access to free camping (BLM land, National Forests, dispersed sites) that hookup-dependent RVers miss entirely.
What You’re Installing: The Four Components
- Solar panels: Mounted on the roof, collect sunlight, convert to DC electricity
- Charge controller (MPPT): Regulates panel output, protects battery from overcharge
- Battery bank: Stores energy for use at night or on cloudy days
- Inverter/charger: Converts 12V DC battery power to 120V AC for household appliances; also charges from shore power
Step 1: Know Your Power Requirements
Before buying anything, document your daily loads:
| Appliance | Watts | Hours/Day | Wh/Day |
|---|---|---|---|
| 12V compressor fridge | 40 avg | 24 | 960 |
| LED lighting | 30 | 6 | 180 |
| Laptop | 65 | 6 | 390 |
| Phone charging (2) | 30 | 2 | 60 |
| Maxxair fan | 40 avg | 8 | 320 |
| TV (32″) | 60 | 3 | 180 |
| Water pump | 60 | 0.3 | 18 |
| Total (typical RV without AC) | 2,108Wh |
This ~2kWh/day figure is the baseline for a single adult or couple doing basic RV living without rooftop AC use. Add 1,500–5,800Wh/day for AC use if you plan to run it from solar (see below).
Step 2: Choose Your Battery Chemistry (LFP vs Lead-Acid)
LiFePO4 (Lithium Iron Phosphate) — Recommended
- 95% usable capacity (vs 50% for lead-acid)
- Charges faster, no maintenance
- 10+ year lifespan (3,000+ cycles)
- Handles partial state-of-charge without damage (lead-acid sulfates if not regularly fully charged)
- Lighter: 200Ah LFP weighs 48 lbs vs 130 lbs for 200Ah AGM
- Cost: 200Ah 12V LFP = $450–600
AGM Lead-Acid (Budget Option)
- 50% usable capacity (to protect from deep discharge)
- Heavier and bulkier per usable Wh
- 3–5 year lifespan if not deeply discharged
- Can be damaged by irregular charging
- Cost: 200Ah 12V AGM = $250–400
Recommendation: LFP for any serious RV setup. The upfront premium pays back in longevity, weight savings, and usable capacity. AGM only makes sense for weekend RVers with very light power use who don’t want to invest.
Step 3: Size Your Battery Bank
Formula: (Daily use Wh × Autonomy days) ÷ Usable capacity percentage = Required Wh
Example for typical RV (2,000Wh/day)
- For 2 days of autonomy with LFP (90% usable): 2,000 × 2 ÷ 0.90 = 4,444Wh
- In 12V terms: 4,444 ÷ 12 = 370Ah → Round up to 400Ah
Battery Bank Sizes by RV Use Case
| Use Case | Daily Wh | Battery (LFP) |
|---|---|---|
| Weekend (no fridge) | ~800Wh | 100Ah 12V ($299) |
| Weekend (with fridge) | ~1,500Wh | 200Ah 12V ($549) |
| Full-time without AC | ~2,000Wh | 300–400Ah 12V ($800–1,200) |
| Full-time with AC use | ~5,000–8,000Wh | 600Ah+ 12V or 24V system ($2,000+) |
Step 4: Size Your Solar Panel Array
Formula: Daily Wh ÷ Peak sun hours ÷ System efficiency (0.80) = Watts needed
For 2,000Wh/day in the Southwest (5.5 peak sun hours): 2,000 ÷ 5.5 ÷ 0.80 = 455W of panels
RV Roof Panel Mounting Options
- 100W rigid panels ($100–130 each): Standard choice. Most RV roofs fit 3–6 panels.
- 200W rigid panels ($130–200 each): Fewer panels, same wattage. Useful when roof space is limited.
- Flexible panels: Lower profile but less efficient and shorter lifespan. Not recommended for permanent RV installation.
Typical roof yields by RV type:
- Class A motorhome: 800–1,200W possible
- Class C motorhome: 400–600W typical
- Travel trailer (28ft): 400–600W typical
- Fifth wheel: 600–1,000W possible
- Van/camper van: 200–600W
Step 5: Choose Your Charge Controller
Always use MPPT (not PWM) for RV installations:
- Victron SmartSolar 100/50 ($160): Best for up to 600W at 12V. Bluetooth app monitoring. Most popular for van/small RV.
- Victron SmartSolar 150/60 ($200): For 700W–900W at 12V. Higher PV voltage limit (150V) — allows more panels in series.
- Victron SmartSolar 150/100 ($350): For 1,000W+ at 12V or 2,000W at 24V. Full-size Class A systems.
Step 6: Choose Your Inverter/Charger
An inverter/charger is a single unit that converts DC to AC (inverter) AND charges the battery from shore power (charger). Essential for RVs that use campground hookups:
- Victron Multiplus 12/2000/80 ($500): 2,000W inverter, 80A charger. Industry standard for small/medium RVs. Best for systems up to 600Ah battery and 2,000W continuous loads.
- Victron Multiplus II 24/3000/70 ($650): 3,000W inverter on 24V system. Best for larger RVs with more battery and rooftop AC.
- Renogy 2,000W Pure Sine ($200, inverter only): Budget option for systems that don’t need shore power charging via the inverter. Pair with a separate shore power charger.
Can You Run Rooftop AC on Solar?
The most common RV solar question. The short answer: yes, but it’s expensive to do correctly.
- 13,500 BTU rooftop AC: ~1,450W running, 3,500W startup surge
- Running 4 hours/day: 5,800Wh/day of AC alone
- To sustain AC 4 hours/day from solar (Southwest):
— 5,800Wh ÷ 5.5h ÷ 0.80 = 1,318W of panels needed
— Plus a battery bank for non-solar hours: 600Ah minimum - Total system to run AC: ~$5,000–8,000 in panels + batteries + controller + inverter
Most RVers with solar run AC for 2–4 hours during peak solar production (11am–3pm) rather than all day, and use fans + ventilation for evening/morning comfort. This extends the solar system’s AC capability without requiring the largest possible battery bank.
Sample System Quotes (2025)
Budget Weekend System (~$1,100)
- 200W rigid panel: $130
- 100Ah 12V LFP: $299
- Victron SmartSolar 75/15: $65
- Renogy 1,000W Inverter: $120
- Wiring, fuses, connectors: $150
- Total: ~$764 parts + $200–400 installation
Full-Time No-AC System (~$2,800)
- 3 × 200W rigid panels: $390
- 400Ah 12V LFP (2×200Ah): $900
- Victron SmartSolar 100/50: $160
- Victron Multiplus 12/2000: $500
- Wiring, busbar, fuses, monitors: $300
- Total: ~$2,250 parts + $400–600 installation