Elecnova ECO-B261LP-2H

ECO-B261LP-2H — a battery cabinet for PV-plus-storage

The ECO-B261LP-2H is a liquid-cooled battery cabinet with 261 kWh, an embedded energy management system and aerosol fire suppression. It is not an all-in-one system: the inverter does not sit inside the cabinet but alongside it, as a hybrid unit handling the PV input, the grid connection and the operating strategy.

That sounds like a drawback and often is not one on a new PV installation. A hybrid inverter couples the array to the storage system on the DC side instead of routing it through a separate PV inverter and the shared AC bus. That saves one conversion step and one device.

Five power configurations

Capacity is identical across the variants; what differs is the inverter in front of it:

PV input	AC power	DC/AC ratio
150 kW	75 kW	2.0
160 kW	80 kW	2.0
200 kW	99.9 kW	2.0
200 kW	100 kW	2.0
250 kW	125 kW	2.0

The step from 99.9 to 100 kW is not a typo. In several European grid codes 100 kW is a threshold above which additional requirements apply — the 99.9 kW variant exists to stay just below it. Whether that matters at a given site is for the grid operator to decide.

The consistent DC/AC ratio of 2.0 stands out: the PV generator may be sized at twice the AC power. For a system that absorbs the surplus anyway this makes sense — the midday peak is not clipped away but stored.

Ten MPPT trackers

The PV input works with ten independent MPPT trackers at 150 to 950 V and 42 A per tracker. That is unusually many for this class and in practice matters more than the raw input rating: roof areas with different orientation, pitch or shading can be run separately, without the weakest string dragging the others down.

Footprint

The datasheet gives two sets of dimensions. The cabinet itself stands on 1,050 × 1,350 mm — the roughly 1.4 m² the manufacturer advertises. The overall figure of 1,850 × 1,350 × 2,100 mm includes the inverter bay attached to the side. Site planning should use the overall figure, the foundation the smaller one.

Key specifications

Feature	ECO-B261LP-2H
Battery capacity	261.25 kWh (5 × 52.25 kWh)
Cell chemistry	LFP, 314 Ah
Configuration	1P260S
Nominal DC voltage	832 V (728–936 V)
Charge/discharge rate	0.5 P
Depth of discharge	100 % (at 25 ± 2 °C)
Cycle life	≥ 8,000 cycles
Round-trip efficiency	up to 90 %
AC power	75 / 80 / 99.9 / 100 / 125 kW
Grid voltage	400 V, 3W+N+PE, 50/60 Hz
PV input	up to 250 kW, 150–950 V, 10 MPPT
Cooling	active liquid cooling
Operating temperature	−25 to 55 °C (derating above 45 °C)
Ingress protection	IP55
Corrosion class	C4 (C5 optional)
Fire suppression	aerosol
Communication	Modbus TCP/IP
Dimensions (W×D×H)	1,850 × 1,350 × 2,100 mm overall
Weight	2,600 kg
Standards	UN 38.3, IEC 62619, IEC 63056, IEC 62477-1, IEC 61000-6-2/4
Grid codes	EN 50549-1/-2, VDE-AR-N 4105, G99, NRS 097, C10/11

Where it fits

The B261 is the right choice when a larger PV array is being built or extended and storage is planned in from the start. Where an existing AC-coupled array is already running and is not to be rebuilt, an all-in-one system with its own PCS — the ECO-E261LP-2A at the same capacity, for instance — is usually the more direct route.

Every project has to settle which hybrid inverter is used. It determines AC power, PV input rating and the operating modes of the whole system — the cabinet alone does not fix those.