Hoymiles HoyUltra 2 Series HESS-261-2h is an LFP storage system for commercial and industrial use. It provides 261 kWh nominal energy with about a 2-hour duration on an AC block. The unit uses liquid cooling with 314 Ah prismatic cells and weighs 2.7 tonnes (5,952 lb).
Use Cases
Hoymiles HoyUltra 2 Series HESS-261-2h has energy capacity in the commercial and industrial class. It connects at 340 V, a low-voltage AC connection. Together these specifications indicate use behind the meter.
Capabilities
Its AC block includes the inverter, which points to renewable colocation, storing output from a wind or solar plant on the same site. The specifications suggest peak shaving, discharging into the hours of highest demand. Its shortest listed configuration is 2 h, which makes Hoymiles HoyUltra 2 Series HESS-261-2h a candidate for capacity value, standing in as firm capacity when demand peaks.
Nominal energy
0.26MWh
Rated AC power
0.13MW
Duration
2hour
C / P rate
0.5P
What does this system typically cost?
BESSBASE.com user price estimates for HoyUltra 2 Series HESS-261-2h by Hoymiles and similar storage systems. The ranges are LDP (Landed Duty Paid) prices per kWh that cover all expenses of delivering the goods to the buyer's premises, including production, shipping, sales margins, and import duties.
Sign up to see and submit price estimates.
BESSBASE.com users can privately compare and submit prices for HoyUltra 2 Series HESS-261-2h by Hoymiles and similar systems across 20+ international markets.
Energy & Power
Architecture
DC Side
AC Side
Physical & Footprint
Battery Cells
Lifespan
Protection
Full Specification Sheet
MembersThe rest of this spec sheet is for members
3 more specification blocks on this product. Create a free account to see every field on every product.
You stay on this page — it fills in as soon as you are signed in.
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 Hoymiles Systems
5| Compare | Logo | Vendor | System | Energy | Power | Duration | Battery Cell | Open |
|---|---|---|---|---|---|---|---|---|
| Hoymiles | HoyPrime 5MW/10MWhAC Block | 10MWh | 5MWAC | 2h0.5C | LFP | |||
| Hoymiles | HoyPrime 1MW/2MWh Containerized Battery Energy Storage SystemAC Block · 20 ft container | 2.06MWh | 1MWAC | 2h0.5C | LFP | |||
| Hoymiles | HoyCore Outdoor Battery SystemDC Block · cabinet | 0.34MWh | — | —0.5C | LFP280 Ah · Prismatic | |||
| Hoymiles | HoyUltra 2 Series HESS-261-2hAC Block · cabinet | 0.26MWh | 0.13MWAC | 2h0.5C | LFP314 Ah · Prismatic | |||
| Hoymiles | HoyUltra All-in-One Battery SystemAC Block · cabinet | 0.22MWh | 0.1MWAC | —0.5C | LFP280 Ah · Prismatic |
About the Vendor
Founded in 2012 and based in Hangzhou, Hoymiles started as a Chinese microinverter maker and later expanded into energy storage systems. Its BESS line includes the HiOne home system, which combines the inverter, battery, and EMS and scales to 64 kWh, and the HoyUltra 2 liquid-cooled system for larger uses; in 2026, Hoymiles signed agreements with more than 10 Middle Eastern partners.
How to Read the Product Page
This profile of HoyUltra 2 Series HESS-261-2h by Hoymiles 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.
