Sharp's New Home Battery: 21% Bigger, 35% Smaller Footprint

Imagine a home battery that holds more energy but fits in tighter spaces, perfect for cramped city homes where every square foot counts.

Sharp just announced its Eee Storage JH-WB2621, an 11.5 kWh residential battery that rewrites the rules on home energy storage. The lithium iron phosphate battery delivers 21% more capacity than previous Sharp models while shrinking the footprint by 35%, a feat that reduces volume per kilowatt-hour by an impressive 55%.

At just 95 kilograms, the battery is light enough for easier installation and flexible enough to work indoors or outdoors. It can even operate in temperatures from negative 15 to 45 degrees Celsius, opening doors for homeowners in both scorching and freezing climates who previously couldn't use home batteries.

The real magic happens through Sharp's Cocoro Energy app, which uses AI to learn your household patterns and solar generation habits. The cloud-based system automatically manages when to store and when to use battery power, helping homeowners reach nearly 75% solar self-consumption and significantly cut grid electricity costs.

During power outages, the system shines brightest. Sharp boosted discharge output from 3.0 kVA to 4.2 kVA, meaning you can now run multiple heavy appliances simultaneously when the grid goes down. Unlike older systems requiring dedicated emergency outlets, this battery powers your whole home through the regular distribution board, even handling 200-volt appliances like induction cooktops.

Homeowners can choose whole-home backup or select specific circuits to stay powered during outages. The selective approach extends backup time by focusing power on essentials and may reduce installation costs.

The Ripple Effect

This technology matters beyond individual homes. As more households install efficient batteries, they reduce strain on electrical grids during peak hours and store excess solar energy that would otherwise go to waste. Each compact battery installed in a Japanese apartment or townhome represents one more household moving toward energy independence.

The combination of smaller size and smarter AI makes home batteries accessible to urban residents who previously lacked the space. That's thousands of potential installations that can collectively make power grids more stable and communities more resilient during emergencies.

Sharp plans to produce 1,000 units monthly starting September 8, 2026, for the Japanese market. The main battery unit carries a recommended retail price of 3,751,000 yen (about $23,550), with additional components required for complete installation.

For homeowners dreaming of energy independence, Sharp just made that future a little more compact and a lot smarter.