# Lunar Energy scales its home battery system to 300 kWh using stackable 5 kWh blocks

- Published: 2026-11-14 18:42 UTC
- Section: Power & Energy › Batteries
- Tags: Lunar Energy, home battery system, 300 kWh storage, stackable 5 kWh blocks, Tesla Powerwall, Kunal Girotra, bidirectional EV charger, virtual power plants, Sunrun, lithium iron phosphate
- URL: https://realtech.media/news/rt-46b58dfe321e891faf336c9d_lunar_energy_scales/

**The Bay Area startup, led by a former Tesla Energy head, plans about 20000 systems of 30 kWh next year and is positioning itself against the Powerwall.**

![Lunar Energy scales its home battery system to 300 kWh using stackable 5 kWh blocks](https://realtech.media/media/2026/11/2357a9ff32771709.webp)
*forbes.es*

Lunar Energy, a privately held startup from the San Francisco Bay Area, is expanding its home battery system, forbes.es reports. The system is built from stackable 5 kWh blocks and can now scale up to 300 kWh, enough to supply small businesses as well as homes, according to the company [1]. The company is headed by founder and CEO Kunal Girotra, who ran Tesla Energy until early 2020 [1].

Lunar says its system is more space-efficient than Tesla's wall-mounted Powerwall packs, on the market since 2015 [1]. The batteries use lithium iron phosphate cells, which are less prone to catching fire [1]. The company is also launching a bidirectional EV charger that can power a home during outages, along with software for managing household energy use [1].

## Pricing and distribution

A 5 kWh block costs about 3000 dollars, but the company usually supplies the batteries through monthly leases with Sunrun and Octopus Energy that include maintenance and upgrades [1]. About 5000 homes in California, Texas, Utah and Nevada currently use the technology [1]. According to Girotra, the company is working to be available in all 50 states during the next year [1].

## Production and market

Girotra said the plan for next year is to produce about 20000 systems of 30 kWh, roughly 600 MWh, and to triple that the year after [1]. Lunar has raised more than 500 million dollars, including a 232 million dollar round in February that values the company at more than 1000 million dollars [1].

The company sees demand in virtual power plants, where electricity stored in customers' batteries is shared with the grid. Voltus announced plans last month to supply Google with 1 GW from distributed energy systems, and Sunrun says it can make up to 16 GW available to the US grid together with Renew Home and Tesla [1].

The Trump administration removed many federal incentives for residential clean energy, but commercial demand for batteries, driven by data centers, is at a peak [1]. The US installed a record 20.2 GWh of storage capacity in the second quarter of 2026, bringing first-half installations to almost 31 GWh, according to a report by the Solar Energy Industries Association and Benchmark Mineral Intelligence [1]. The residential share of that market will probably reach 3900 million dollars this year [1]. Tesla's energy revenue fell 6% to 8400 million dollars in the first three quarters of the year [1].

## Sources

1. [forbes.es](https://forbes.es/actualidad/1064281/amenaza-baterias-domesticas-tesla-su-exdirector)
2. [ecosistemastartup.com](https://ecosistemastartup.com/lunar-energy-la-extesla-que-reta-al-powerwall-con-300-kwh)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-46b58dfe321e891faf336c9d_lunar_energy_scales/