Keystone’s SolarFlex 660i-L vs. a Custom Victron Solar System

If you’re shopping for a high-end RV solar package, Keystone’s SolarFlex Outlast 660i-L often comes up. It’s a well-integrated factory option, but how does it compare to a custom Sota Solar Victron RV installation at a similar price point? Let’s break it down.

What Keystone Includes for About $11,400 Extra

The SolarFlex Outlast 660i-L adds:

  • Solar Array: roughly 660 W (three 220 W panels)
  • Battery Bank: a 270 Ah Dragonfly heated lithium battery
  • Inverter/Charger: about 3,000 W with built-in transfer switch
  • Charge Controller: 50 A Victron MPPT with Bluetooth monitoring
  • Extras: factory wiring, portable panel port, and soft-start air-conditioning support

It’s a tidy, factory-installed system—perfect for light off-grid use and shorter boondocking trips.


A Comparable Sota Solar Build (~$12,100)

For roughly the same budget, a typical Sota Solar system delivers far more capacity:

  • Solar Array: 1,000 W of Rich Solar panels
  • Battery Bank: 600 Ah of heated LiFePO₄ storage
  • Inverter/Charger: 3,000 W Victron MultiPlus II
  • Charge Controller: 70 A Victron MPPT, Bluetooth enabled
  • Monitoring: Victron Cerbo GX with touchscreen

That’s ~50% more solar power and over double the battery capacity—ideal for extended off-grid stays.



Spend a Little More, Double Your Solar

Step up to our next package (about $14,000) and the gains are dramatic:

  • Solar Array: 2,000 W—triple Keystone’s wattage
  • Dual MPPT Controllers to handle the extra input
  • Same robust 3,000 W inverter and 600 Ah battery bank

For only a few thousand more than the 660i-L, you literally double—or even triple—the solar wattage, giving you faster recharges and the ability to run more appliances comfortably.





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