Off-Grid Lithium Batteries

Lithium Batteries for Off Grid Solar: 12V, 24V and 48V Storage Compared

Lithium batteries for off grid systems are the part of the setup you draw on every night, so they decide how many cloudy days you can ride out and how long the system lasts. Every battery in this collection is LiFePO4, rated for 4,000 to 8,000 or more cycles, with a built-in BMS. The practical choice is between small 12V and 24V units for vans, cabins and boats, and 48V modules in wall-mount, server-rack or floor-standing form for whole-home systems.

The collection holds 20 batteries from Rich Solar, Sungold Power, Bluetti, EG4 and Fortress Power. Prices run from $390 for a 12V 100Ah battery to $4,560 for four self-heating 48V rack modules, 20.48kWh in one order.

How to choose lithium ion off grid batteries

• System voltage first. 12V fits a van or a tiny cabin running DC loads and a small inverter; the Rich Solar 12V 100Ah ALPHA 1 LITE stores 1,280Wh for $390. 24V halves the current for a 2,000 to 3,000W inverter; the Rich Solar 24V 100Ah ALPHA 4 LITE is the value pick at 2,560Wh. 48V is the standard for home inverters of 5,000W and up.
• Capacity in kWh. Multiply nightly load by the days of autonomy you want. A cabin at 3kWh a night with one cloudy day of reserve needs about 6kWh; the Sungold Power 5.12kWh Powerwall SG48100M at $1,130 gets close, and two of them cover it. A full home is better served by the EG4 PowerPro 48V 14.3kWh in one enclosure.
• Form factor. Wall-mount powerwalls hang in a garage. Server-rack modules such as the Sungold Power SGH48100T stack in a cabinet and are the easiest to expand. The EG4 PowerPro is IP65 and can sit outdoors.
• Cycle life and discharge rate. The Rich Solar ALPHA LITE range is rated 4,000+ cycles, the full ALPHA units 5,000+, and the EG4 PowerPro 8,000+ with 200A continuous discharge, which matters when a 6,000W inverter pulls hard.
• Cold weather. Charging below freezing damages lithium cells. The ALPHA 1 and ALPHA 4, the SGH48100T rack modules and the Sungold Power self-heating units warm themselves before accepting a charge.

Popular picks in this collection

Sizing tips

• Run your appliance list through the Solar Kit Calculator with your ZIP code; it returns battery, inverter and panel sizes together so the bank is not oversized for the array that has to fill it.
• Confirm closed-loop communication. Check that your inverter lists the battery you pick as a supported model; a matched pair reports true state of charge to the inverter.
• Buy modules in the count you will end with. The 2x and 4x SGH48100T bundles arrive together, so the stack starts life balanced.
• Do not mix voltages or chemistries in one bank, and balance a new module before adding it to an older bank.
• Leave the BMS's low-temperature cutoff enabled. Self-heating models handle winter on their own; the LITE models should be mounted somewhere that stays above freezing.

Frequently asked questions

How many lithium batteries for off grid solar do I need for a cabin? For lights, a fridge, a water pump and electronics, one 5.12kWh 48V module or two 24V 100Ah batteries is a typical starting point. Add a second module to sleep through a rainy weekend without a generator.

Rack, wall or floor: which is better? Rack modules are the cheapest way to grow past 10kWh, wall units save floor space, and the 14.3kWh EG4 PowerPro is the tidiest large single unit. Pick based on the room you have and how far you expect to expand.

Can I use lithium ion batteries for off grid systems with an older lead-acid charger? Only if the charger has a lithium profile; the higher charge voltage and the absence of a float stage matter. Most inverters sold here have that setting.

Every battery ships free to the mainland US from our brand partner warehouses, usually within a few business days, with 30-day returns. Call us with your inverter model and we will confirm which battery pairs with it.