FFD POWER

28/09/2026

Agrivoltaic BESS in Israel | 46 Units Designed Around the 800-Hour Tariff ☀️🌾🔋

Rozelman Greenhouse is FFD POWER’s solar-plus-storage project at a 4 MWp agrivoltaic site in Israel, using 46 battery units deployed across multiple locations on the farm, each paired with a 50 kW hybrid inverter.
One important factor behind the system design is Israel’s “800-hour tariff.” Eligible PV-plus-storage projects are rewarded for shifting sufficient solar energy into defined peak periods, with an annual threshold of 800 kWh of peak-period export per kW of qualifying PV capacity.
In Israel, those evening peak periods typically last 5–6 hours. That makes storage duration a critical part of the project economics.
System Configuration
• PV capacity: 4 MWp
• Battery systems: 46 × 261 kWh
• Hybrid inverters: 46 × 50 kW
• Total inverter power: 2.3 MW
• Total battery capacity: 12.006 MWh
• Energy-to-power ratio: 5.22 hours
• Application: Agrivoltaics + distributed energy storage
There is no central battery block. Each 261 kWh unit sits next to its own section of the agrivoltaic array, paired 1:1 with a 50 kW hybrid inverter. The 5-hour duration is what lets the system cover the full evening peak window in one daily cycle — which is what allows the project to meet the 800 kWh/kW annual requirement.
Status
Commissioned in May 2026, the system is now shifting daytime solar generation into the evening peak period.
Why distributed rather than centralized?
We'll cover the architecture decision on Wednesday, and the field deployment realities on Friday.

👉 Planning a BESS around a time-of-use or peak-shifting tariff? Contact FFD POWER for BESS sizing, system configuration and integration support.

28/09/2026

Managing Grid Voltage Fluctuations | 800 V BESS Commissioning in Ukraine 🔋

On Wednesday, we explained why we chose AC coupling for Project Сонерджі #1 Перемишляни in Ukraine: a 1.26 MW / 2.508 MWh BESS connected directly to an operating solar farm’s 800 V AC bus.
Today, we’re sharing how the cabinet’s auxiliary power design gave our commissioning team more flexibility when adapting to local grid conditions.
During commissioning, the nominal 800 V supply varied between 730 V and 920 V. The PCS remained operational, while the transformer-fed 220 V auxiliary supply also varied with the grid.
This brought two practical requirements into focus: keeping essential communications powered and managing voltage fluctuations at the AC auxiliaries.
Two power sources for essential 24 V communications
Each cabinet includes two sources connected in parallel to the 24 V circuit:
• Grid-side AC/DC supply
• Battery-side DC/DC supply
This design allows the grid-side AC/DC supply to be isolated when necessary, while the battery-side DC/DC supply continues powering essential communication devices.
Having both sources already built into the cabinet gave the team a practical way to maintain communications independently of the fluctuating AC supply.
Additional voltage management for 220 V auxiliaries
For AC auxiliary equipment, a voltage stabilizer can help keep the supply within the required range. A voltage protection relay can also disconnect the relevant loads when voltage moves outside set limits.
Equipment such as the liquid-cooling unit can accommodate brief interruptions while battery temperatures remain within operating limits. This provides flexibility to protect the auxiliaries while supporting continued BESS operation.
The approach brings both parts together:
• Keep essential 24 V communications powered from the battery.
• Use voltage stabilization or protective disconnection for AC auxiliaries.
Although the observed grid conditions extended beyond the cabinets’ specified operating range, the existing design gave our team options to support site adaptation. That is an important part of commissioning: understanding actual site conditions and helping the customer put the system’s capabilities to practical use.

👉 Planning a solar-plus-storage retrofit? Contact FFD POWER to discuss site conditions and BESS integration.

23/09/2026

Why We Chose AC Coupling for Our Latest 800 V Solar-Plus-Storage Project in Ukraine 🔋

On Monday, we shared our latest project Сонерджі #1 Перемишляни in Ukraine: a 1.26 MW / 2.508 MWh BESS connected directly to an operating solar farm’s 800 V AC bus.
So why AC coupling instead of DC coupling?
The key difference is where the battery connects.
• AC coupling: the BESS PCS connects to the same AC bus as the PV inverters. The PV system and battery system operate independently on the AC side.
• DC coupling: the battery connects on the PV DC side through a DC/DC converter, allowing solar energy to charge the battery before passing through the inverter.

For this project, the solar farm was already operating. The existing electrical architecture was built around an 800 V AC bus, so adding storage on the AC side was the more practical retrofit approach.
We installed 6 × Galaxy 418L, each equipped with a 210 kW / 800 V PCS, and connected them directly to the existing AC bus.
That meant:
• No modification to the PV DC strings
• No replacement of existing PV inverters
• Independent operation of PV and BESS
• Simple integration with the existing 800 V infrastructure
DC coupling can make more sense for a greenfield solar-plus-storage project, where PV and storage are designed together from the beginning and the DC architecture can be optimized as one system.
For an existing solar farm, however, AC coupling often provides a much cleaner path to adding storage.
The coupling method should follow the project architecture — not the other way around.

On Friday, we’ll share an issue our commissioning team encountered during energization that wasn’t identified during the pre-sale stage.

👉 Planning a solar-plus-storage retrofit? Contact FFD POWER for AC- and DC-coupled BESS configurations.

22/09/2026

800V BESS for Solar Farms | 1.26 MW / 2.508 MWh in Ukraine ☀️🔋

Project 【Сонерджі #1 Перемишляни】is FFD POWER's latest solar-plus-storage installation: a 1.26 MW / 2.508 MWh BESS tied directly to an operating solar farm's 800 V AC bus in Ukraine.

In this configuration, AC coupling means the six battery cabinets connect to the same 800 V AC line as the farm's PV inverters — no matching transformer, no extra conversion stage between battery and grid.

Background The price spread told the whole story. Before storage, midday solar surplus crashed the local market: after 12:00, 1 MWh was trading at just 120 Ukrainian hryvnias — about $2.70 — while evening peak prices reach up to $350 per MWh ($0.35/kWh).
On top of that, transmission constraints forced curtailment. The operator added storage for three reasons: shift that oversupplied midday volume into the evening peak, back out of curtailment during export bottlenecks, and keep the site powered locally when the grid drops.
System Configuration
• Battery cabinets: 6 × Galaxy 418L, each 210 kW / 418 kWh
• Total BESS: 1.26 MW / 2.508 MWh
• PCS: 6 × Galaxy210K-800V, each 210 kW / 800 V AC
• Coupling: AC-coupled at the site's existing 800 V AC bus

Status Energized in September 2026. The BESS now charges on cheap midday surplus and discharges into the evening peak window, capturing that spread the farm had no way to monetize before.
Why 800V At 800 V AC the BESS drops the site transformer entirely and runs at half the current of a 400 V solution — cutting I²R cable losses by 75% at equal cable resistance.
We'll break down why this site went AC-coupled rather than DC-coupled on Wednesday.

👉 Planning an 800V solar-plus-storage project? Contact FFD POWER for system configurations and technical support.

17/09/2026

Turning Rooftop Solar into Daytime Savings and Nighttime Revenue ☀️🔋

FFD POWER deployed 6 × Galaxy 261 BESS cabinets, each paired with a 50kW hybrid inverter, for a dairy farm equipped with rooftop solar.

During the day, solar power is prioritized for onsite consumption, while surplus PV generation is stored in the battery system.
🌙 After sunset, the stored solar energy can be discharged and exported to the grid according to the customer’s energy trading strategy.

The system provides 1.566MWh of battery storage and 300kW of hybrid inverter capacity, helping the farm get more value from its rooftop PV generation.
☀️ Rooftop solar self-consumption
🔋 6 × Galaxy 261 — 1.566MWh
⚡ 6 × 50kW hybrid inverters — 300kW
🌙 Store surplus solar for later grid export

15/09/2026

✅ 800 V PCS certified to VDE-AR-N 4110 / 4120, now listed in ZEREZ.

FFD POWER’s Galaxy210K-800V PCS is certified by SGS TECNOS, S.A. and is now listed in ZEREZ, Germany’s central register for unit and component certificates.

The public listing allows project teams to check the PCS certificate and applicable standards when planning their energy storage systems. 🇩🇪

This certified 210 kW / 800 V PCS is used in our two BESS solutions:
• Galaxy 418L — 210 kW / 418 kWh
• Galaxy 836L — 210 kW / 836 kWh

👉 Planning an 800 V solar-plus-storage project in Germany? Contact us for certification documents, technical specifications and system configuration support.

10/09/2026

Solar BESS for Long Duration Nighttime Energy Trading ☀️🔋

FFD POWER deployed 4 × Galaxy 261 battery cabinets paired with 50kW hybrid inverters for a solar-plus-storage project in Israel, providing 1.044MWh of battery capacity.

The system stores solar energy during the day and exports it to the grid during higher-priced nighttime periods, supporting more than 4 hours of discharge.

☀️ Store daytime solar generation
🔋 4 × 261kWh battery cabinets
⚡ 50kW hybrid inverter configuration
🌙 4+ hours of nighttime energy trading

Matching battery capacity to the intended discharge window helps the customer shift solar generation into hours when electricity earns more—making energy storage duration a key part of the project’s commercial design.

03/09/2026

BESS for Solar Self-Consumption in Hot Climates ☀️🔋

FFD POWER deployed 7 × Galaxy 261L all-in-one BESS cabinets for a solar-plus-storage project in Israel, providing a total capacity of:
⚡ 875kW / 1.827MWh
🔋 7 × Galaxy 261L all-in-one BESS
☀️ Solar self-consumption
🌡️ Designed for reliable operation in hot and harsh environments

The system stores surplus solar generation during periods of high PV output and releases the energy when onsite demand increases, helping the customer consume more solar energy locally and reduce dependence on grid electricity.

For projects operating in hot environments, thermal management is especially important. The Galaxy 261L uses a liquid-cooled battery thermal management system to maintain a more stable and uniform battery temperature, supporting consistent performance while helping reduce thermal stress on the cells.

01/09/2026

Reliable Backup Power for Critical Factory Loads in Ukraine⚡

FFD POWER deployed a solar-plus-storage backup system for a flooring factory in Ukraine, designed to keep critical loads operating when grid conditions become unstable or power is lost.

The PCS operates in VSG mode, allowing the BESS to establish and stabilize voltage and frequency during islanded operation. Working together with a fast transfer switch, the system can complete grid-connected/off-grid transitions at around 20 ms, minimizing interruption to critical production loads.

During normal grid-connected operation, the BESS also helps smooth PV output, reducing short-term fluctuations and supporting more stable integration of onsite solar generation.

One system serving two priorities: day-to-day solar stability and power resilience when the grid goes down.

07/03/2026