The sentence that asks for infinite energy
"Rated output available for the whole shift" is a sentence about a fuel tank, not about a load. A diesel answers it with a tank; a battery answers with kilowatt-hours, and those run out. The P25 holds 2,500 W continuously, 5,000 W peak for ten seconds, and carries 2.7 kWh at 29 kg — so 1 kW across four hours of an eight-hour shift is 4 kWh, and the other four hours are a charging window.
The fix is one added column. Ask for energy at a stated load plus the recharge window. The P25 reaches 80 percent in about two hours and full charge in 2.5 hours from a 500–1,500 W input; three units in parallel as a P25-T carry 8.1 kWh and 7,500 W on 400 V three-phase at 10 A per phase.
The connection that no battery can make
"Connected to the site's main low-voltage distribution" excludes every portable unit, usually without the author noticing. A portable power station supplies its own sockets; it does not feed a building's fixed distribution. The clause arrives by habit: the previous supply was a generator with a changeover device, so the changeover device stays in the text after the generator goes.
Write the consumers instead of the connection. Which tools, at which rating, where, for how long. That change makes an impossible requirement comparable, and it exposes the cases where a battery is honestly the wrong answer — useful at tender stage, not after delivery.
The formalities that outlive the fuel
A fuel storage area, a refuelling point and an exhaust route are descriptions of a diesel wearing the clothes of a safety requirement. None is wrong for an engine; all are meaningless for a sealed unit with no intake and no exhaust, and a supplier who cannot tick the box is removed by a formality.
This is where most battery offers die: on boxes that do not apply. Split the specification into what the site needs and what the previous machine required. Keep access and fire rules that apply to any equipment; delete the ones that only describe a tank.
Where a word like "uninterruptible" lands
If the specification says USV, it asks a question most battery units answer with no. There is a gap between the mains dropping and a portable unit taking over, and naming the unit a UPS does not close it. The C24 states a changeover of 10 milliseconds or less; the P series is not a standby supply.
Say what the process tolerates. A cabinet that must not blink and an office that can wait two minutes are different requirements, and only the first needs a UPS.
The rewriting test
Three questions separate a requirement from a habit. What is the load in watts, and how many hours per shift does it run? Which consumers sit behind the clause — 230 V single phase or 400 V three-phase? Where does the unit stand, and how does it get there: a P25 weighs 29 kg, and a staircase decides more configurations than a datasheet.
Ask the same three questions of every bidder. The comparison then fits on one page: kWh at the stated load against litres at the stated load, plus the recharge or refuel window.
What this is not
This is not a claim that batteries fit every tender. A 400 V three-phase load at high current for a full shift stays a hard case, and a site needing a permanently wired supply is outside what a portable unit does: it supplies its own sockets, not the building. Whether a clause is admissible is a question for whoever wrote the specification.
What we can put in writing is narrower. CE under the EMC Directive 2014/30/EU with test report A2409245-C01-R01-V1, UN 3480 class 9 packaging for sea transport, UN38.3 and MSDS, IP54 as an enclosure class rather than a certification, an operating range of −10 to 65 °C, and a ten-point test protocol per unit with serial number and firmware recorded.
Send us the clause, not the brochure. If one sentence keeps removing the battery option, send it with your load list through https://www.hitama.net/en/contact, and we will tell you which part is a real requirement.