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Off-grid & solar storage

Off-Grid Lithium Batteries

LiFePO4 storage for cabins, sheds, remote sites and backup power. Full usable capacity, thousands of cycles and no maintenance routine to keep the lights on.

  • 100% usable capacity for real overnight autonomy
  • Series and parallel capable for larger banks
  • Works with common solar charge controllers and inverters
  • 5,000+ cycles at 80% depth of discharge
Shop off-grid storage Ask about sizing
100% Usable capacity
5,000+ Cycles at 80% DoD
10 yr Promise series warranty
Off-Grid Lithium Batteries
48V Common off-grid bank voltage
  • Full usable capacity
  • Scalable banks
  • Solar controller ready
  • US-based support
  • Ships from the USA
1

Total your daily loads

List every load in watt-hours per day and size the bank for a full day plus reserve.

2

Match the inverter and controller

Set the LiFePO4 profile on your charge controller and confirm inverter voltage matches the bank.

3

Plan for cold

If the bank lives in an unheated space, choose a heated model or block charging below freezing.
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Buyer questions

Off-grid storage FAQ

Will lithium fit my existing battery bay?
Yes in most coaches. Our RV batteries are built to standard group 24, 27 and 31 footprints so they drop into the same tray with the same terminal layout.
Do I need a new converter or charger?
Your charging source needs a lithium (LiFePO4) profile. Many modern converters have a lithium setting; older lead-acid-only converters should be replaced or reconfigured.
Can I charge from the alternator?
Yes, with a DC-DC charger. Charging straight from the alternator can overload it because lithium accepts current so aggressively.
How many batteries do I need?
Add your daily amp-hour draw and multiply by the nights you want off grid. Most weekend travelers land on 100 to 200Ah; full-timers usually run 300Ah or more.
Is it safe to mount inside the coach?
Yes. LiFePO4 vents no gas and holds no liquid acid, so it is safe in a sealed interior compartment.
What happens in freezing weather?
The BMS blocks charging below freezing to protect the cells. Heated models warm themselves so you can keep charging in winter.
Talk to an RV power specialist

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from 454 reviews
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Anonymous
GREAT

GREAT SERVICE

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Fleet Lithium 51 Volt Battery Bundle for Polaris Ranger EV (2010–2024)
Randy E.
Awesome kit for cold weather climate

Awesome kit. We Live in a very cold climate, our ranger gets a ton of use year round and especially during the winter so the cold weather performance was a must for us. We've had the kit installed for about a year now and it's been perfect. Customer service has been super helpful the one or two times we had questions and we've got a couple of neighbors who run the kits as well and they say the same thing. Kevin and his crew are really top notch!

Fleet Lithium 51 Volt Battery Bundle for Polaris Ranger EV (2010–2024)
12V DC Voltage Reducer — 30A
Carter A.
Solved inconsistent accessory voltage — 12V voltage reducer

The 12V voltage reducer corrected the unstable behavior that had affected the lights and other accessories. The output has remained steady through regular use.

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58.4V 18A On-board LiFePO4 Charger (CH5618)
Samantha S.
A practical spare or replacement — 51V replacement charger

The 51V replacement charger is easy to keep available as a backup and works without unnecessary controls. The battery reaches a complete charge consistently during normal use.

58.4V 18A On-board LiFePO4 Charger (CH5618)
Fleet Lithium 51 Volt Battery Bundle for Polaris Ranger EV (2010–2024)
Claire Z.
Clean fit for the Polaris Ranger EV bundle — Polaris Ranger EV bundle

The Polaris Ranger EV bundle lined up well with the intended mounting area and the connections were easy to identify. Once installed, the vehicle felt smoother and more consistent through normal use.

Fleet Lithium 51 Volt Battery Bundle for Polaris Ranger EV (2010–2024)
58.4V 18A On-board LiFePO4 Charger (CH5618)
Cooper X.
Dependable charging from the 51V replacement charger — 51V replacement charger

The 51V replacement charger connected as expected and has charged the compatible battery consistently. The status indicators are easy to follow, and the unit feels solid in regular use.

58.4V 18A On-board LiFePO4 Charger (CH5618)
Lee L.
Easy installation and great technical support

Easy installation and great technical support.

Fleet Lithium - High Performance Lithium Batteries
Club Car Precedent / Tempo / DS (2008.5-2021) 48V Lithium Battery Conversion Kit — Fleet Lithium
Owen F.
Responsive performance after installation — Club Car 48V kit

After installing the Club Car 48V kit, throttle response felt more immediate and the vehicle no longer felt sluggish late in the charge. The cleaner battery compartment is another welcome improvement.

Club Car Precedent / Tempo / DS (2008.5-2021) 48V Lithium Battery Conversion Kit — Fleet Lithium
4 AWG Battery Cable Set (Pair)
Frank K.
Cabels look great

Cabels look great. Will be installing them by the end of the week. Frank

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BlueMax Marine 12V 195Ah LiFePO4 Deep Cycle Battery (Group 27)
Parker A.
Reliable marine power from the BlueMax 200Ah marine battery — BlueMax 200Ah marine battery

The BlueMax 200Ah marine battery has provided steady power for onboard electronics and normal time on the water. It is easier to handle than the older battery and has required very little attention between trips.

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Duplicate - EZGO TXT (2010-2021) (48V) Fleet Lithium Conversion Kit
Erica X.
Straightforward upgrade with the EZGO TXT kit — EZGO TXT kit

The parts for the EZGO TXT kit were organized clearly and the installation sequence made sense. The finished setup looks tidy and removes the routine upkeep of the old battery bank.

Duplicate - EZGO TXT (2010-2021) (48V) Fleet Lithium Conversion Kit
87.6V 13A On-board LiFePO4 Charger (CH8713)
Bennett T.
Simple replacement charger — 76V replacement charger

The 76V replacement charger replaced the previous unit without requiring a complicated setup. Charging has been predictable, and the connector fits securely.

87.6V 13A On-board LiFePO4 Charger (CH8713)
58.4V 18A On-board LiFePO4 Charger (CH5618)
Ethan I.
Secure connection and steady charging — 51V replacement charger

The plug on the 51V replacement charger seats firmly and the unit maintains a normal charging cycle. The battery has been ready for use each time charging is complete.

58.4V 18A On-board LiFePO4 Charger (CH5618)
Duplicate - EZGO RXV (2008-2021) (48V) Fleet Lithium Conversion Kit
Savannah R.
Straightforward upgrade with the EZGO RXV kit — EZGO RXV kit

The parts for the EZGO RXV kit were organized clearly and the installation sequence made sense. The finished setup looks tidy and removes the routine upkeep of the old battery bank.

Duplicate - EZGO RXV (2008-2021) (48V) Fleet Lithium Conversion Kit
12V DC Voltage Reducer — 30A
Adrian F.
Straightforward way to add 12V power — 12V voltage reducer

The 12V voltage reducer provided a clear path for running standard accessories from the higher-voltage battery system. The result has been reliable and easy to service.

12V DC Voltage Reducer — 30A