Lithium Batteries

RV Lithium Batteries and Solar Storage: How to Choose

Lithium iron phosphate (LiFePO4) batteries store the energy your panels make and give it back at night or during an outage. This collection covers RV lithium batteries for 12V and 24V systems, 48V rack and wall units for cabins and homes, and expansion packs that plug into Anker and Bluetti power stations.

There are 79 batteries here from Rich Solar, Pytes, Sungold Power, EG4, Bluetti and Anker. Prices start at $799 for a 24V 100Ah battery and reach $7,499 for a 20.48kWh outdoor cabinet with four Pytes V5 modules.

How to choose a lithium battery

• Voltage. Match the inverter and charger you own. Vans, trailers and boats usually run 12V; the Rich Solar ALPHA 2 PRO 12V 200Ah is the fit there. 24V suits mid-size RVs and small cabins, where the Rich Solar ALPHA 4 24V 100Ah gives 2,560Wh. Whole-home and off-grid systems run 48V, and every rack, wall and cabinet unit here is 48V.
• Capacity in kWh. One 100Ah 48V module such as the Bluetti B4810 or the Pytes V5 holds 5.12kWh, about a night of fridge, lights and electronics. A home that needs to ride out a full day wants 10 to 15kWh; the EG4 PowerPro packs 14.3kWh in one case.
• Cycle life and warranty. Both are stated per product. The Pytes V5 is rated 6,000+ cycles with a 10-year warranty, the EG4 PowerPro 8,000+ cycles, the ALPHA 2 PRO 7,000+ cycles with a 10-year warranty. More cycles at the same price is the better buy for daily solar use.
• Form factor. Server rack modules stack in a cabinet and are easy to add to. Wall units like the Sungold Power 5.12kWh Powerwall hang in a garage. The EG4 PowerPro is IP65 and mounts outdoors; the Pytes 20.48kWh bundle ships in an IP55 cabinet.
• Cold weather. Lithium cells cannot charge below freezing. The ALPHA 4 and ALPHA 2 PRO include internal self-heating, which matters for winter boondocking and unheated boats.

Popular picks in this collection

Sizing tips

• Start with the Solar Kit Calculator. Enter your appliances and ZIP code and it returns the battery kWh, inverter size and panel wattage you need, so you are not guessing between one and two modules.
• Buy modules of the same model when you plan to parallel. The 4 x Sungold Power SG48100P bundle gives 20.48kWh of matched cells at from $4,320, which avoids mixing ages and brands in one bank.
• Expansion batteries are not standalone. The Anker SOLIX BP3800 only works with the F3800 station, and the Bluetti B500 pairs with the EP900 or EP800. Check the host unit before you buy.
• Boat owners should look at sealed, fused designs. The best lithium solar batteries for a marine bank are the self-heating ALPHA models when the boat winters in cold water.

Frequently asked questions

Can I replace lead-acid RV batteries with lithium? Usually, if your charger and converter have a lithium profile. A 12V 200Ah LiFePO4 gives more usable energy than two 12V lead-acid batteries and weighs less, but confirm the charge settings first.

How many batteries do I need for home backup? Two 5.12kWh modules cover a fridge, lights, internet and a furnace fan overnight for most homes. Add a third if you run a well pump or a mini split.

Are these lithium batteries for boats safe below deck? LiFePO4 chemistry is stable, and the ALPHA batteries use individually fused cells. Mount them in a ventilated, dry compartment and use a charger set for lithium.

Every battery ships free to the mainland US from our brand partner warehouses, typically within a few business days, with 30-day returns. Not sure which lithium batteries for solar power match your inverter? Call and we will check compatibility before you order.