When the grid goes down, a large battery bank keeps lights, refrigeration, and internet running, and this collection focuses on storage sized for exactly that. Brands include BigBattery, Homegrid, EG4, and Sungold Power, with options from $750 to $32,000, including the EG4 PowerPro 12kW 28.7kWh and the EG4 48V WallMount 16kWh self-heating model. These suit homeowners adding backup to an existing solar array or building a new hybrid system. Capacity in kWh sets how long you can run your loads, while inverter size sets what you can run at once, so size both together. Compare the models below; shipping is free to the contiguous US.
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Halloween Sale-$50 auto at checkout
SPOOKY150 extra $150 off $2,000+
In stock · ships in 1-4 days
Halloween Sale-$50 auto at checkout
SPOOKY150 extra $150 off $2,000+
In stock · ships in 1-4 days
ECO100 $100 off $1,500+
In stock · ships in 1-4 days
ECO100 $100 off $1,500+
In stock · ships in 1-4 days
ECO100 $100 off $1,500+
In stock · ships in 1-4 days
ECO50 $50 off at checkout
In stock · ships in 1-4 days
ECO100 $100 off $1,500+
In stock · ships in 1-4 days
Halloween Sale-$50 auto at checkout
SPOOKY150 extra $150 off $2,000+
In stock · ships in 1-4 days
Halloween Sale-$50 auto at checkout
SPOOKY150 extra $150 off $2,000+
In stock · ships in 1-4 days
Solar batteries for home backup store what your panels make during the day and release it at night or when the utility drops. In this collection "big" means 10kWh and up: enough to keep a refrigerator, well pump, furnace blower, lights and networking running through a multi-hour outage, or to power a house that has no grid at all. You will find wall-mounted units, server-rack stacks, outdoor cabinets and complete inverter-plus-battery packages.
The collection holds 54 products from EG4, Sungold Power, BigBattery, Pytes, Sol-Ark and HomeGrid. Prices run from about $1,580 for a single 5.12kWh rack module to $26,415 for a three-phase 85.8kWh off-grid system. Every battery here is 48V-class lithium unless the product title says otherwise.
Related guide: compare price per kWh, Powerwall 3 installed quotes and DIY systems in our whole-home battery backup cost guide.
| Product | Key numbers | Best for | Price from |
|---|---|---|---|
| Sungold Power 10.24kWh Powerwall X | 51.2V, 200Ah, wall-mounted | Essentials backup on a budget | $2,390 |
| EG4 48V WallMount 16kWh All-Weather | 314Ah, IP67, 10,000 cycles | Exterior wall, daily solar cycling | $3,750 |
| Pytes V5 20.48kWh Outdoor Cabinet | 4 x 100Ah, 6,000+ cycles, IP55 | Whole-home backup without a battery room | $7,499 |
| HomeGrid 8 Stack'd 38.4kWh | 48V, 8 modules, 38.4kWh | Large homes, multi-day autonomy | $17,999 |
How many kWh do I need for a solar backup system for home essentials? Fridge, lights, router, furnace fan and a few chargers typically use 8 to 12kWh over 24 hours. A 14.3kWh or 16kWh wall unit covers one full day; the 28.7kWh PowerPro package covers two.
Do these lithium batteries for home power backup work with my existing solar? Most do if you have or add a 48V hybrid inverter. Tell us the inverter model and we will confirm closed-loop communication before you order.
Can the battery sit outside in rain and snow? Only the units rated for it: the EG4 All-Weather series (IP65 and IP67), the Pytes outdoor cabinet (IP55) and the Sungold PowerMax outdoor line. Indoor units such as the Sol-Ark 40kWh bank are IP20.
All solar home backup systems here ship free to the mainland US from brand partner warehouses, usually within a few business days, with 30-day returns. Call us with your panel and inverter details and we will check the match before you buy.
