Tesla Megapack 2 (2-Hour) is a utility-scale battery energy storage system supplied as an AC block with 2.5952 MWh nominal energy. It supports 2 and 4 hour configurations and has 92% AC round-trip efficiency.
Use Cases
Tesla Megapack 2 (2-Hour) has energy capacity in the utility-scale class. Its supported protocols include DNP3, used in utility control systems, and together point to use in front of the meter.
Capabilities
Tesla Megapack 2 (2-Hour)'s shortest listed configuration is 2 h, which points to peak shaving, reducing the peak load at the connection point; the specifications suggest grid services, support for the operation of the electricity network. Configurations listed up to 4 h make Tesla Megapack 2 (2-Hour) a candidate for energy shifting, taking in power and returning it hours later. Its longest listed configuration is 4 h, which points to capacity value, standing in as firm capacity when demand peaks. Its AC block includes the inverter, which points to renewable colocation, storing output from a wind or solar plant on the same site.
Nominal energy
2.6MWh
Rated AC power
1.3MW
Duration
2–4flexible
Round-trip efficiency (AC)
92 %AC
What does this system typically cost?
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Energy & Power
Architecture
DC Side
AC Side
Physical & Footprint
Battery Cells
Lifespan
Protection
Full Specification Sheet
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Plant Round-Trip Efficiency
The calculator estimates the full "plant" round-trip efficiency (RTE) at the point of interconnection. Some values are pre-blocked depending on information on a particular ESS. The rows that are marked "each way" are one-way efficiencies; they are applied on charge and again on discharge. We then square them. To enter a bundled PCS efficiency value, use its rated-power value, not peak. If the PCS skid already includes the LV/MV transformer, set Transformer LV/MV to 100 % so those losses are not counted twice.
Site Space Required
Shared: one 3 m aisle serves both neighbours. Dedicated: each unit keeps its own 3 m, so gaps double to 6 m.
Single unit — matches the stored area_sqm convention.
More Tesla Systems
8| Compare | Logo | Vendor | System | Energy | Power | Duration | Battery Cell | Open |
|---|---|---|---|---|---|---|---|---|
| Tesla | Megapack 3DC Block | 5MWh | 2.5MWAC | 1–8hflex | LFP | |||
| Tesla | Megapack 2 XL 4-Hour C012AC Block | 4.3MWh | 1.08MWAC | 4h0.25C · flex | — | |||
| Tesla | Megapack 2 XLDC Block | 4.3MWh | 1.9MWAC | 2–4hflex | LFP | |||
| Tesla | Megapack 2 XL 4-Hour C010 / C011AC Block | 3.92MWh | 0.98MWAC | 4h0.25C · flex | — | |||
| Tesla | Megapack 2 XL 2-Hour C010 / C011AC Block · cabinet | 3.85MWh | 1.93MWAC | 2hflex | — | |||
| Tesla | Megapack 2 (4-Hour)AC Block | 3.09MWh | 0.77MWAC | 4h | LFP | |||
| Tesla | Megapack 2 (2-Hour CMA Only)AC Block | 2.92MWh | 1.46MWAC | 2h | LFP | |||
| Tesla | Megapack 2 (2-Hour)AC Block · cabinet | 2.6MWh | 1.3MWAC | 2–4hflex | — |
About the Vendor
Founded in 2003 and based in Austin, Texas, Tesla expanded from electric vehicles into battery energy storage with Megapack and Powerwall. It deployed 31.4 GWh in 2024 and 43.5 GWh in the 12 months through the third quarter of 2025, including a record 12.5 GWh in one quarter, which shows its BESS manufacturing scale for utility and project finance counterparties.
How to Read the Product Page
This profile of Megapack 2 (2-Hour) by Tesla is assembled exclusively from public data to support early-stage screening and requires additional due diligence.
Always confirm these terms and technical specifications directly with the vendor and project stakeholders. Reflect all agreed-upon details in the legal agreements before making any investment decisions.
