Replacing a diesel generator: what a battery covers — and what it does not

Anyone looking for a generator wants one thing above all: power at the moment it matters. A battery storage unit delivers that in some cases — and not in others. This page separates the two instead of blurring them.

Four questions before you replace a diesel generator

How long does the unit really have to run? One shift yes, three days no. Continuous duty over many hours remains the strength of a combustion engine.
Which motor starts? The starting surge of the largest load decides the configuration — not the sum of the wattage figures.
230 V or 400 V three-phase? Single-phase loads are covered by one unit; three-phase loads need the bank with a distribution unit.
Where does the unit stand, and is exhaust acceptable there? Basements, car parks, stairwells and tunnels rule the combustion engine out regardless of its rating.

Which configuration carries which load

One unit: lighting, radio, measuring equipment, chargers and hand tools — the basic need of a working site.
Two units in parallel: tools alongside lighting, with headroom for the starting surge of the largest device.
Three units plus distribution: 400 V three-phase for larger motors, pumps and welders, with the load split across three storage units.

P-series parallel power systems

One modular platform. Add parallel units where the load grows — two or three units single-phase, or three units for 400 V three-phase.

Configuration	Units	Rated power	Usable capacity	Weight	Output
P25	1	2,500 W	2.7 kWh	29 kg	230 V / 16 A · single-phase
P25 + P25-D	2	5,000 W	5.4 kWh	≈60 kg	230 V · single-phase · AC230V/20A output
P25 + P25-D	3	7,500 W	8.1 kWh	≈90 kg	230 V · single-phase · AC230V/30A output
P25 + P25-T	3	7,500 W	8.1 kWh	≈90 kg	400 V · three-phase · AC400V/10A output

P25
Units
1
Rated power
2,500 W
Usable capacity
2.7 kWh
Weight
29 kg
Output
230 V / 16 A · single-phase
P25 + P25-D
Units
2
Rated power
5,000 W
Usable capacity
5.4 kWh
Weight
≈60 kg
Output
230 V · single-phase · AC230V/20A output
P25 + P25-D
Units
3
Rated power
7,500 W
Usable capacity
8.1 kWh
Weight
≈90 kg
Output
230 V · single-phase · AC230V/30A output
P25 + P25-T
Units
3
Rated power
7,500 W
Usable capacity
8.1 kWh
Weight
≈90 kg
Output
400 V · three-phase · AC400V/10A output

Wiring

The parallel distribution unit carries one power input and one data input per battery unit, and a single output to the load.

AC230V/20ATwo P25 units, 230 V single-phase.
AC230V/30AThree P25 units, 230 V single-phase.
AC400V/10AThree 230 V P25 units in parallel make 400 V three-phase — all three required, or the system loses a phase.

How the parallel link is wired

Each P25 runs one power cable and one data cable to its own input pair on the distribution unit.
The distribution unit has three input pairs (L1 / L2 / L3); one pair per battery unit.
Only the distribution unit output feeds the load. Battery units are never connected to the load directly.
Each unit keeps its own protective device; no unit back-feeds another.

Three configurations, one platform

Start with a single unit and add parallel units only when the load demands it. Every configuration runs the same battery unit and the same distribution unit.

P25
The core unit. A fanless, self-cooling 230 V power station that replaces the combustion generator on site — no exhaust, no idling noise, no fuel run.
Key figures
Rated power
2,500 W
Peak power
5,000 W (≤10 s)
Usable capacity
2.7 kWh
Output
230 V · 16 A
Protection
IP54
Weight
29 kg
Request a quote
P25 + P25-D
Two or three units linked through the parallel distribution unit for 230 V single-phase loads. Power and capacity stack — start with two, add a third when the job needs it.
Key figures
Units
1–3 × P25
Rated power
2,500–7,500 W
Peak power
5,000–15,000 W (≤10 s)
Usable capacity
2.7–8.1 kWh
Output
AC230V · 20–30 A
Request a quote
P25 + P25-T
Three 230 V P25 units in parallel produce the 400 V three-phase supply that runs tools which will not start on single phase. All three are required — remove one and the system loses a phase. Carried and assembled by hand: no crane, no lifting gear.
Key figures
Units
3 × 230V P25
Rated power
7,500 W
Peak power
15,000 W (≤10 s)
Usable capacity
8.1 kWh
Output
AC400V · 10 A three-phase
Request a quote

Feature overview

Every part, numbered on the real machine — the same order as the wiring diagrams above.

P25 — the workhorse unit

Hitama P25 site power station front port panel: AC output socket, AC charging input, power switch, battery display, USB-C, solar input, parallel power and data ports — Port panel

AC output · 230 V / 16 APlug cutters, welders and drills straight in.
AC charging inputOn grid power, charge it overnight.
Power switchOne turn starts the station.
Battery displaySix LEDs — charge readable from the doorway.
USB-CKeeps phones and laptops topped up.
Solar inputFit a panel, keep charging on site.
Parallel power portPower line to the P25-D / P25-T box.
Parallel data portData line — the units stay in sync.

Hitama P25 portable power station three-quarter view: carry handle, IP54 enclosure, 2.7 kWh battery body — Body

Carry handle29 kg — carried by hand to the load.
IP54 enclosureDust-protected, spray-water protected.
2.7 kWh batteryUsable capacity per unit, fanless.

P25-D — 230 V parallel box

Hitama P25-D parallel distribution box front view: mounting hook, AC230V-30A output, breaker protection window, six parallel input ports — Front

Mounting hookHang the P25 units on the box.
EnclosureThe parallel box — ready out of the crate.
Parallel output · AC230V-30AThe only feed to the load.
Mounting stopHolds the box in place on the ground.
Protection device areaThe breakers, behind a protected window.
Parallel 1 inputP25 No.1 power line — AC230V-10A.
Parallel 1 data inputP25 No.1 data line.
Parallel 2 inputP25 No.2 power line — AC230V-10A.
Parallel 2 data inputP25 No.2 data line.
Parallel 3 inputP25 No.3 power line — AC230V-10A.
Parallel 3 data inputP25 No.3 data line.

P25-T — 400 V three-phase box

Hitama P25-T three-phase parallel box front view: mounting hook, AC400V-10A output, breaker protection window, six parallel input ports — Front

Mounting hookHang the P25 units on the box.
EnclosureThe three-phase box — ready out of the crate.
Parallel output · AC400V-10AThree-phase — the only feed to the load.
Mounting stopHolds the box in place on the ground.
Protection device areaThe breakers, behind a protected window.
Parallel 1 input · L1P25 No.1 power line — AC230V-10A.
Parallel 1 data inputP25 No.1 data line.
Parallel 2 input · L2P25 No.2 power line — AC230V-10A.
Parallel 2 data inputP25 No.2 data line.
Parallel 3 input · L3P25 No.3 power line — AC230V-10A.
Parallel 3 data inputP25 No.3 data line.

Optional accessory

Put the sun to work. A 400 W folding panel clips into the P25 solar input — charge on site, no mains. Parallel two of them: 800 W into the station.

Hitama 400 W folding solar panel for the P25 — unfolded four-section panel, folded case with orange handle, and a 3 m MC4 cable

Optional

Folding Solar Panel 400 W

One panel, 400 W. Folds flat, carries by hand, plugs into the P25 solar input. Parallel two panels — 800 W charging the station together.

Max. power (Pmax): 400 W
Voltage at Pmax (Vmp): 72 V
Current at Pmax (Imp): 5.56 A
Open-circuit voltage (Voc): 86.4 V
Short-circuit current (Isc): 5.89 A
Max. system voltage: 1000 V
Connector: MC4
Frame: ETFE
Protection: IP54
Weight: 9.1 kg
Size, folded: 612 × 590 × 50 mm
Size, unfolded: 2230 × 590 × 25 mm
Operating temperature: -40 °C to +70 °C
In the box: 3 m connection cable

Request a quote

For trade, rental fleets and public procurement

OEM and ODM: custom logo printing, adapted configuration and packaging for your own channel.
Rental fleets: the units are built for circulation — carrying handle, IP54, no fuel, no instruction on a combustion engine.
Public procurement: technical documentation on output, conformity and transport for the tender.
Three details are enough for a quotation: loads, voltage, quantity.

Why without diesel — and where the genset stays better

No exhaust: in basements, car parks, stairwells and tunnels exhaust is not a nuisance but rules the combustion engine out. There the battery unit is not the convenient option, it is the only one.
No fuel that ages: diesel in the tank loses its ignition quality over months. Those who rarely need the unit discover that only when it fails.
No cold start in frost: the starting procedure is the most common reason a genset does not run when it matters.
No engine noise: communication on site remains possible without hearing protection.
The counter-check: for continuous duty over many hours, for large loads and where no charging point is reachable for days, the genset remains the right choice. Anyone telling you otherwise is selling you the wrong unit.

Datasheet and sizing

Three details are enough for sizing: which loads run at the same time, how long an operation lasts and whether 400 V is needed.

Frequently asked questions

The questions buyers actually ask before a first order — answered with numbers from our own datasheets, not from a brochure.

Does battery storage fully replace a generator?

No. For continuous duty over many hours, for large loads and where no charging point is reachable for days, the genset remains the right choice. The usual path is the combination: storage for base load and peaks, genset as fallback.

How long can I run which load?

That is a calculation, not a promise: capacity divided by continuous load, plus headroom for starting surges. Send us your load list and we size the configuration.

Can I rent a battery unit instead of a diesel generator?

We sell to trade and rental fleets, not directly on a rental basis. For rental, contact your regional dealer or ask us for a partner.

Do I need a separate unit for 400 V?

No. Three units with a distribution box give a three-phase supply; a single unit delivers 230 V.

What about a petrol generator?

It carries the same drawbacks as a diesel one — fuel, exhaust, cold start, noise — with an even shorter fuel shelf life. In closed rooms and close to people, both are out.