400W solar pack
The 400W pack from the original Megawatt solar calculator. Check the listing wattage against your roof plan before you buy.
Check price on Amazon
Solar, manuals, and gear for RV owners
Powering
adventure
Plan solar around the roof you actually have, pull up the official manual for your Fleetwood, and shop the gear James already recommends.
- Calculators: 6 from the original site, 6 new
- 12
- Fleetwood models in the manual hub
- 9
- Checklists you can save and print
- 7
- Amazon links, kept exactly as James published them
- 15
Start here
Four ways in
Pick the job in front of you. Each path starts with your rig and ends with a plan, a manual, or a part.
Plan my solar
Roof layout, daily watt-hours, battery, inverter, and wire, in three tiers from Weekend to Off-grid.
Find my manuals
Fleetwood owner's manuals first, then Dometic, Norcold, Lippert, Suburban, and Onan. Every link goes to the maker.
Shop gear
Batteries, solar packs, and road gear from the original Megawatt calculators, bundled into kits.
Read guides
Solar kits, lithium or AGM, inverter sizing, and boondocking power, written from sources you can check.
The flagship
Size solar to your roof, not a brochure
Drag the sliders. This is the same math the original Megawatt solar calculator used: daily watt-hours divided by sun hours, at 75% system efficiency.
The full planner adds
- A roof layout that shows how many panels fit
- A battery bank picked from the Vatrer table
- Inverter and charge controller sizing
- Wire gauge at a 3% voltage drop
- Weekend, Boondocker, and Off-grid tiers with parts lists
Quick sizing
Live800watts of solarto aim for
4
200W packs
800 W total
2
400W packs
800 W total
2,400 Wh is the Megawatt load table's midsize rig: LED lights and fans, a hybrid fridge, and two TVs with chargers.
Fleetwood manual hub
The right manual, from the people who wrote it
Pick your model and go straight to Fleetwood's own pages. Appliance manuals link to the company that built the appliance. We don't rehost PDFs.
- BounderClass A
- DiscoveryClass A
- Discovery LXEClass A
- SouthwindClass A
- FlairClass A
- Pace ArrowClass A
- FrontierClass A
- JamboreeClass C
- TiogaClass C
Also linked: Dometic and Atwood, Norcold, Thetford, Lippert, Suburban, and Cummins Onan generators.
Find my manualsChecklists
Seven lists that live on your phone
Tick items off as you go. Your progress stays in this browser, every list prints clean, and items that need a part link straight to it.
Installer matching
Rather not climb the ladder?
Send your ZIP, your rig, and the tier you picked. Megawatt follows up about installers near you. Every installer we list comes from a public source, and none of them carry made-up ratings.
Get matched with an installerShop gear
The gear behind the numbers
These are the Amazon links from the original Megawatt calculators, kept exactly as James published them.
As an Amazon Associate I earn from qualifying purchases. Links marked "Check price on Amazon" are paid links, and prices are shown on Amazon, not stored here.
Vatrer 12V 300Ah lithium battery
3,840 Wh of 12V lithium. It's one of the eight Vatrer sizes the battery calculator chooses from.
Check price on AmazonTireMinder TPMS
Linked from the fuel savings calculator, because a soft tire costs you mileage long before it costs you a blowout.
Check price on AmazonGarmin RV GPS
Dr. Megawatt's pick for RV routing, linked on the fuel and license pages of the original site.
Check price on AmazonRead guides
Field notes, with sources
Short guides on solar, batteries, and Fleetwood upgrades. If a number isn't sourced, it isn't in there.
From the channel
Dr. Megawatt, on video
Straight talk on batteries, black tanks, and dealer games from Dr Jones' Dose of Reality, plus films from Megawatt partners. Videos open on YouTube, so this page stays fast.
Partners
Shops we send people to
These partners were listed on the original Megawatt site. Confirm any discount with the partner; we don't promise one here.
Solar installation
CCRV (Cross Country RV Solar)
LED lighting
Boogey Lights
Mobile detailing
Wade’s Mobile Detail
Megawatt Merch
Wear the trip
Tees, hoodies, and camp goods from megawattmerch.com. Prices below were captured on October 1, 2026, when the store listed 65 products. The store has today's prices.
Your roof, your loads, your plan
Start with the coach in your driveway
No account, no sales call. The planner runs in your browser, and nothing is sent anywhere unless you ask for an installer.