How Much Solar Do You Need?
Most Tune M1 owners need 100–200W of solar for weekend camping, or 200–400W for extended off-grid trips with a 12V fridge. A single 100W panel generates roughly 40–60 Ah per day in decent sun, enough to offset overnight fan, lighting, and device charging. A practical framework by use case:
- Weekend warrior (1–2 nights, no fridge): 100W. On a typical sunny day, a 100W panel generates 40–60 Ah, which replenishes most of your overnight fan and device draw
- 3–5 day off-grid (no fridge): 100W with a 100Ah battery is a reasonable pairing. You'll be net-neutral or slightly positive on most sunny days
- Running a 12V fridge: 200W is the practical minimum, a fridge adds 25–40 Ah/day of draw, and you need enough solar to cover both fridge and other loads
- Extended off-grid (7+ days, fridge, cloud country): 200W+ paired with 200Ah battery. This combination handles multi-day cloudy stretches comfortably
Solar output varies dramatically by location and season. Plan for 3–4 peak sun hours as a conservative assumption if you camp in mixed conditions. Desert camping in summer often delivers 5–6 hours, but don't size your whole system around that.
Roof Mount vs. Portable Panels
| Factor | Roof Mount | Portable Panel |
|---|---|---|
| Setup time | Zero, always collecting | Requires deployment each stop |
| Shaded campsites | Stuck with shade | Can reposition to sun |
| Wattage potential | Limited by M1 roof area | Expandable: bring more panels |
| Payload weight | Permanent load | Optional: leave home if not needed |
| Driving charging | Charges while driving | Only at camp |
| Durability | More exposed to elements | Can store protected |
| Cost | Higher (permanent install) | Often lower, more flexible |
For M1 owners, roof-mount flexible panels are the most popular choice, they collect while driving (meaningful for charging between campsites), don't require deployment, and keep the setup clean. Portable panels are preferred by owners who camp heavily in shade, value flexibility in panel placement, or don't want to deal with a permanent roof install. Many M1 owners start with a portable panel and add a roof mount later once they know their camping patterns.
Charge Controller: MPPT vs. PWM
Use MPPT. The efficiency gains (particularly in partial shade, early morning, and late afternoon) are worth the modest price difference for any system over 50W. MPPT controllers also handle higher-voltage panel strings, giving you more wiring flexibility if you add panels later.
Controller sizing: match your controller to your total panel wattage. A 20A MPPT handles up to ~260W on a 12V system. A 30A MPPT handles up to ~400W. Community-tested options:
- Victron SmartSolar 75/15 or 100/20, community favorite, excellent Bluetooth monitoring app, very reliable, ~$80–$100
- Renogy Rover 20A MPPT, lower cost, good for budget builds, solid reliability track record, ~$50–$70
Mounting on the M1
Tune Outdoor offers a factory Solar Port add-on that routes wiring from the battery compartment through the roof with proper weatherproofing. If you order the Solar Port, third-party panels connect via standard MC4 connectors. Tune's own ETFE flexible panel kit is designed specifically for the M1 roof and connects via Anderson PowerPole.
For DIY roof mounts without the factory port: many owners run wiring through a weatherproof grommet through the roof edge. Flexible panels adhere with VHB tape or Z-brackets. Keep panel weight distributed evenly across the roof surface and avoid sharp edges that could damage the M1's canvas pop-top.
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Solar Payload Impact
Solar adds weight to your payload budget. Don't forget to account for:
- Panel weight: 200W flexible panel = ~6–7 lbs; Tune 2-panel kit (2×220W) = ~24 lbs; portable fold-out 220W bifacial = ~15 lbs (can be left home)
- Charge controller: typically 1–3 lbs for MPPT units
- Wiring and connectors: ~1–2 lbs for a typical M1 install
- Mounting hardware varies widely — VHB tape adds almost nothing; a full rail system can add 5–10 lbs
Use the payload calculator to add these items to your build and see the total impact on your truck's margin.