Lithium

13 products

These are lithium iron phosphate (LiFePO4, or LFP) batteries for solar storage, home backup, and off-grid power. Match the battery to your inverter or system type first, not the brand: a 48V battery inverter or hybrid, a high-voltage hybrid, and an Enphase IQ system each need a different kind of battery.

Lithium batteries on this page, by system type

  • 48V-class batteries (51.2V nominal, DC-coupled): the UZ Energy IG-16K-U 16kWh and RUiXU Lithi2-16 16kWh cabinets, the SimpliPHI 6.6 48V (6.65 kWh per module) and the PHI 3.8 48V (3.87 kWh). They connect to a 48V battery inverter or hybrid inverter, which charges them from solar, the grid, or a generator. Before buying any of these, confirm your inverter is on the battery maker's compatibility list, or ask our team through the site.
  • 24V batteries (DC-coupled): the PHI 3.8 24V (3.87 kWh) for smaller 24V inverter/charger systems.
  • High-voltage stack (GoodWe): GoodWe Lynx Home FH-US 3.2kWh modules, three to six per tower (9.6 to 19.2 kWh), plus the required GoodWe PCU control unit. They work only with supported GoodWe hybrid inverters.
  • AC-coupled (Enphase): the Enphase IQ Battery 5P (5.0 kWh), IQ Battery 10C 10kWh and 10C 5.0kWh unit. Each complete IQ Battery has built-in microinverters and connects to the home's AC wiring as part of an Enphase IQ system, not to a 48V DC bus. The 10C 5.0kWh unit is a building block for a complete IQ Battery 10C, not a standalone battery. The 5P and 10C use different Enphase system equipment and are not meant to be mixed; check each product page for the combiner, gateway, or other equipment that model needs.
  • SimpliPHI accessories: the SimpliPHI 6.6 battery controller (one per stack), EnergyTrak control system and floor mount base. These support a SimpliPHI bank and don't replace the battery modules.

How to choose a lithium solar battery

  1. Start with the inverter. A 48V battery inverter or hybrid takes a 48V-class (51.2V) battery; confirm the inverter is on the battery maker's compatibility list before buying. A high-voltage hybrid needs the battery its maker approves. An Enphase IQ system uses Enphase batteries.
  2. Size usable energy to your loads. Add up the watts of the circuits you want to run and the hours you need them, then compare that to each battery's usable kWh. Compared with lead-acid, LFP batteries are typically rated for a deeper usable depth of discharge (often 80 to 100%, versus about 50% for lead-acid), so more of the nameplate capacity is usable. Cycle life is also usually much longer; check each battery's cycle and warranty ratings on the spec sheet rather than assuming a number. Upfront price is often higher than lead-acid, but the cost per kWh delivered over the battery's life is usually lower when you account for usable capacity and cycle life. Our guide to sizing a battery bank walks through the math.
  3. Plan expansion. Parallel only identical batteries the manufacturer allows. Don't mix 24V and 48V packs, brands, or lithium and lead-acid on one bus. See series and parallel battery connections.

What else a lithium battery system needs

For a bank sized to your loads and inverter, request a written quote or send a battery backup system quote request. Include your inverter model (or the system you plan to build), the circuits you want to run, and how many hours of backup you need.

Lithium battery FAQ

Is every lithium battery on this page LiFePO4?

Yes. The lithium batteries we list for solar storage use lithium iron phosphate (LFP) cells. Other lithium-ion chemistries such as NMC and LCO are more common in electric vehicles, tools, and consumer electronics. Always confirm chemistry and charge settings on the product page.

What is the difference between low-voltage and high-voltage home batteries?

Low-voltage batteries such as the UZ Energy, RUiXU, SimpliPHI and PHI 48V models run at about 51.2V and connect to 48V battery inverters; confirm the inverter is on the battery maker's compatibility list, or ask our team through the site. High-voltage batteries such as the GoodWe Lynx Home FH-US stack modules in series, from 192V with three modules to 384V with six, and need an inverter built for that battery. The two are not interchangeable.

SimpliPHI or Enphase: DC-coupled or AC-coupled?

SimpliPHI and PHI packs are DC-coupled: they sit on a 24V or 48V DC bus with a hybrid or inverter/charger. Enphase IQ Batteries are AC-coupled: each complete battery has built-in microinverters and works within an Enphase IQ system. Both use LFP cells. Pick the one that fits the system you have or plan to build. The IQ Battery 5P and IQ Battery 10C use different Enphase system equipment and are not meant to be mixed.

Can I mix 24V and 48V packs?

No. Match pack voltage to the inverter or charger bus, and parallel only identical, same-age modules the manufacturer allows.

Do I need a separate charge controller with a hybrid inverter?

Often not for the main array, since many hybrids include MPPT charging. Add a standalone charge controller when you DC-couple a second array or run a classic charge controller plus inverter/charger setup.

Can I charge a lithium solar battery below freezing?

It depends on the battery. Many LFP batteries should not be charged below freezing; the PHI 3.8-M pages say not to charge below 32°F, which can void the warranty. The RUiXU Lithi2-16 has a built-in heater so it can charge in cold weather. Check each battery's spec sheet for its charging temperature range rather than assuming they are the same.

Can altE help me size the bank?

Yes. Share your critical loads in watts, the hours of backup you want, and your inverter model. Request a written quote or send a battery backup system quote request.

LiFePO4 lithium solar batteries: 48V-class cabinets and packs, 24V PHI, GoodWe Lynx high-voltage modules, and Enphase AC-coupled IQ Batteries. Compare all chemistries on solar batteries.