Home Battery Backup

Home Battery Backup: Batteries for Outages, Solar, and Off-Grid Homes

A home battery backup stores electricity so your fridge, lights, internet, furnace blower, and well pump keep running when the grid goes down. Krato Power carries LiFePO4 home batteries from EG4, Rich Solar, Rubix, Renon Power, SimpliPhi, MidNite, Discover Energy, HomeGrid, and more, plus flooded and AGM deep cycle batteries for traditional battery banks. Every order ships free with no sales tax and a price-match guarantee.

Shop by battery type

• Wall mount batteries: the 16 kWh EG4 Indoor and All Weather WallMount (48V, 314Ah) and the 10 kWh SunGoldPower Powerwall X mount on the wall beside your inverter.
• Server rack batteries: 48V modules like the Rich Solar Alpha 5, MidNite PowerFlo5, and Discover Energy 5.0 kWh AES slide into a rack, so you can start around 5 kWh and add modules later. Browse all 48V server rack batteries.
• Stackable and outdoor systems: HomeGrid STACK'D, Renon Power Xtreme, Rubix Stack Series, and SimpliPhi 6.6 kWh modules stack to the capacity you need, and the Discover Energy 16.1 kWh HELIOS installs outdoors as a single unit.
• 12V and 24V lithium batteries: Rich Solar Alpha batteries for cabins, sheds, RVs, and smaller off-grid systems.
• Deep cycle lead acid: Trojan, Rolls, and Fullriver 6V L16 batteries for owners who prefer flooded or sealed AGM banks. See all deep cycle batteries.

How much battery do you need?

Size the battery to the loads you want to cover and how many hours you need them, not to the size of your house. As a starting point:

• Essentials (fridge, lights, internet, phones): about 5 to 10 kWh for a day and a night.
• Essentials plus comfort (add a well pump, some heating or cooling, more outlets): about 10 to 15 kWh.
• Whole home (most circuits and heavy appliances): 20 kWh and up, with an inverter sized for motor surges like central air.

Our guide on how big a battery to run a house walks through the math and runtime examples.

What else you need

A battery stores the power, but an inverter turns it into household AC. Pair your battery with a compatible hybrid inverter, and check that the battery is on the inverter's approved list if you want closed-loop communication. To power hard-wired circuits, use a transfer switch or a backup loads panel installed by a licensed electrician. Add solar panels or a generator to recharge during long outages, or charge from the grid if you do not have solar.

Want a simpler setup? Portable power stations combine the battery, inverter, and outlets in one unit and plug in with no installation.

Home battery backup FAQs

How long will a home battery backup last?

Runtime is capacity divided by load. A 10 kWh battery runs about 500 watts of essentials for roughly 16 to 20 hours, and far less once heavy loads like HVAC kick in.

Do I need solar for a home battery?

No. A battery can charge from the grid and hold that power for outages. Solar adds the ability to recharge during a long outage and lower your daily bill. See whole-home battery backup without solar.

Is LiFePO4 better than lead acid?

For most homes, yes. LiFePO4 lasts thousands of cycles, needs no maintenance, and can use most of its rated capacity. Lead acid costs less up front but is heavier, needs more care, and should not be drained as deeply.

Home backup buying guides

See what home battery backup costs and whether it is worth it, compare voltages in 48V vs 24V vs 12V server rack batteries, build a bank with our off-grid battery bank guide, or compare battery, portable, and standby options in Best Generator for Home Backup.

Not sure what fits your home? Call our US-based team at 888-855-7286 with the appliances you need to keep running and we will size the battery and inverter with you.