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SolarFlex Outlast Extreme 1320i-L combines 1,320 watts of solar collection, heated lithium battery storage and an inverter/charger to support RV appliances and outlets when electrical hookups are unavailable. It also supports battery-powered operation of its compatible soft-start air conditioners. The important distinction is capacity: access to appliances does not mean unlimited runtime or simultaneous use. Monitor battery charge and electrical demand to balance comfort with available energy.
Master Technician Bart Taylor and Matt Wolkins of Future Solutions explain how the package works and how owners can manage it during campsite setup, travel and storage.
Keystone lists the following equipment for the package:
Confirm the installed equipment and component ratings for your RV before operating or expanding the system. Features can vary by production date.
The panels collect energy from sunlight. The charge controllers regulate that energy to charge the battery bank.
The batteries store energy for later use and supply the RV’s DC system. The inverter converts battery DC power into AC power for connected outlets and appliances.
These functions work together, but each has a limit. Panel output depends on conditions, batteries hold a finite amount of energy, and the inverter can supply only its rated load.
A large solar array can help replenish the battery bank during daylight. Overnight or in poor sunlight, stored energy becomes especially important.
Before starting, identify the coach battery disconnect, inverter disconnect, inverter controls and solar-panel disconnects.
For normal operation:
If the system has been fully isolated, batteries removed or electrical service performed, follow the component manuals’ reconnection sequence before these operating steps. Do not operate SolarFlex without the required battery bank connected.
Once running, check the display for battery condition, charging activity and warnings before switching on large loads.
Outlast Extreme provides broader battery-powered appliance access than a solar-prep or battery-maintenance package. However, you still need to manage what runs together.
Air conditioners, microwaves, electric water heating and other high-demand equipment can consume stored energy quickly. Soft-start equipment helps address air-conditioner startup demand; it does not eliminate ongoing consumption.
Before relying on the system for a remote stay, observe normal appliance use while parked. Note how the battery readings change when an air conditioner starts or several appliances operate together.
Reduce demand when necessary, and keep a reserve for essential equipment. Runtime will vary with temperature, appliance cycling, battery condition, sunlight and other loads.
The system offers several ways to understand energy use:
Use VictronConnect to view compatible Bluetooth devices individually. Follow the Cerbo-S GX instructions for its network and remote-access functions.
On a correctly configured SmartShunt, positive current indicates energy flowing into the battery bank; negative current indicates discharge. Estimated time remaining reflects the present load and conditions, so it can change significantly as appliances cycle.
Watch the overall trend rather than treating one momentary reading as a guaranteed runtime.
The inverter/charger can recharge the batteries when an acceptable AC supply is available. Solar charging can also contribute when conditions permit.
Use the correct shore-input and charging-current settings for the available connection. A lower-rated supply requires careful load management, even with a large battery bank.
Follow the hookup instructions for your RV and allow the equipment’s required qualification or transfer delay. Do not assume that a connected cord means charging has started—confirm it on the monitor.
Start with the battery manufacturer’s recommended storage charge level. Turn off unnecessary loads and shut down the inverter before operating its disconnect.
The next steps depend on whether you are placing the RV in disconnected storage or intentionally maintaining the batteries through solar.
For disconnected storage, follow the documented shutdown procedure for the solar controllers, inverter circuit and coach battery circuit. The linked Quickstart Guide directs owners to turn off the PV disconnects for storage.
Do not automatically leave solar connected simply because the RV is outdoors. Maintenance charging requires suitable sunlight, correct charging settings and battery temperatures within the permitted range. Confirm that arrangement with your dealer.
Covered storage may provide little useful solar production. Also check separately connected accessories that could continue drawing power.
Heated batteries still have charging and storage limits. Follow the instructions for your specific Dragonfly models and activate battery heat when required for cold-weather charging.
The heating system uses energy. For disconnected storage, follow the guidance for disabling heat and protecting the batteries from temperatures outside their approved range.
Factory installation does not mean every component has identical warranty terms. Review your Keystone warranty documents and the individual battery and equipment warranties for coverage, exclusions and service procedures.
Review the SolarFlex Quick Start Guide before your next off-grid trip.
Disclaimer: The information contained in this article is deemed to be true and accurate at the time of publication. However, due to the evolving nature of our products and services, there may be changes or updates that occur after this article was published. We encourage users to verify the contents and consult with their dealer or Keystone RV for the most current information. If you have any questions or require further clarification, please do not hesitate to contact your dealer or reach out to Keystone RV directly.