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Off-grid systems

Off-grid, every litre of diesel counts.

Farms, pumping stations, construction sites and remote installations that depend on a generator set running at low load. A BK microgrid with solar PV and a battery in island mode supplies the energy; the generator only starts when needed.

Assess my installationHow it works
Off-grid systems
Power Pro BK112H switchover to island mode
< 20 ms
Indicative savings versus diesel
70–80 %
Off-grid reference in Navarra
215 kWh

The problem

A generator running day and night to cover the occasional peak.

Where the grid does not reach, or is weak, the usual answer is diesel. It works, but it is expensive and you notice it every month.

  • A generator sized for the peak runs almost always at low load: it uses more fuel per kWh and fouls sooner.
  • Every litre has to be bought, transported and stored, and you have no control over the price of diesel.
  • Maintenance is based on running hours: the longer it runs, the more servicing it needs.
  • Bringing the grid to a farm or an isolated pumping station can cost more than the installation itself, and it takes time.
savings by replacing diesel generation with energy storage.
70–80%

BK commercial estimate, for guidance only.

for the Power Pro BK112H to switch to island operation.
< 20ms
BK off-grid system in Navarra, rated at 100 kW.
215kWh
remote monitoring of the system from our control centre.
24/7

How a BK BESS solves it

The battery forms the grid. The generator only runs when it makes sense.

A bidirectional inverter in island mode sets voltage and frequency; PV recharges the battery during the day and BK EMS decides when to start the generator.

  1. 01

    Island-mode microgrid

    The BK inverter forms the grid with no external connection and supplies all loads.

  2. 02

    The sun as the main source

    Solar PV covers the load during the day and recharges the battery for the night.

  3. 03

    Hybrid generator

    If the battery drops below its reserve or a peak arrives that it cannot cover, the generator starts, runs at a good load, recharges the battery and stops.

  4. 04

    Remote monitoring

    BK EMS logs production, consumption, state of charge and alarms, and alerts our control centre.

no gridSolar PVMain sourceGeneratorBackup onlyISLAND MODEBK batterySoC78 %PumpingIrrigation · wellFarmHome · farm buildingsInstallationRemote siteA day in an off-grid microgridgeneratorminimum reserve00h06h12h18h24h
  • Solar PV
  • State of charge (SoC)
  • Generator running

Illustrative layout. BK EMS starts the generator only when the battery reserve falls below the minimum, runs it at an efficient load and stops it as soon as the sun covers the load again.

Where we install it

Where the grid does not reach, or is not enough.

Farms and estates

Homes, industrial buildings and machinery far from the grid.

Isolated pumping stations

Wells and irrigation powered by stored solar energy.

Hybrid generators

The battery absorbs the peaks; the generator only runs when it makes sense.

Construction sites and remote facilities

Temporary or permanent supply where the grid connection doesn't reach or is weak.

Recommended products

What we solve it with.

The full range

Power Pro

112–522 kWh

The BK112H (112 kWh / 50 kW, with a 100 kW PV input) is ready for off-grid operation. For more energy, BK215 to BK418.

View product

Hybrid and island mode

PV · generator · grid

Bidirectional inverters that combine solar PV, generator set and, where available, the grid.

View product
BKENERGIES

Cabinets

241–418 kWh

To scale autonomy in blocks to match each site's consumption.

View product

References

We have already done it.

All projects

Off-grid BESS

Navarra

215kWh

100 kW

Your installation

We tell you which system you need and how it performs in your case.

Project data: type, location, energy and power.

Frequently asked questions

What people ask us before deciding.

Do I have to remove my generator?
No. We integrate it into the microgrid as back-up: it starts less often, runs fewer hours and always at an efficient load.
How much autonomy do I need?
It depends on the load, the size of the solar array and how much you want to rely on the generator. We simulate it with the irradiance at your location and your real load profile.
Can it start the pump motors?
Yes, by sizing the inverter for the starting current. We recommend soft starters or variable-speed drives, which also cut consumption.
How is it monitored without a grid?
Over 4G or whatever connection is available on site. BK EMS sends data and alarms to our 24/7 control centre.
What if the grid arrives later on?
The system connects to the grid and switches to self-consumption, peak shaving and arbitrage. Nothing goes to waste.

How much diesel do you burn a year?

With your consumption and your generator hours, we tell you which microgrid you need and how much fuel you stop buying.

Talk to our engineersView products