EthosPowerAIThe battery arrives on a Thursday, on a truck that cannot wait. In that hour everybody learns whether the room was ready. Most of what goes wrong in the first year of a standby system was decided then: the floor that was never assessed, the eyewash that was ordered but not plumbed, the torque wrench that was in the other van. The sequence below avoids those problems, from the site walk to the commissioning sheet.
Ready the site before the truck
Prepare the room in this order. First, the floor must carry the string. For industrial batteries that means between 1,500 and 3,000 kg per square metre, and a structural opinion for anything above ground level. Second, the room must hold 20 to 25 °C. Every degree above that shortens the life of a lead-acid cell, and the manufacturer's warranty is written at 25. Third, the ventilation must already meet IEEE 1635 with ASHRAE 21 before a single cell is charged.
The safety fittings are not optional, and they cannot wait until later. An eyewash station that gives fifteen minutes of continuous flow, and a safety shower that delivers at least 20 gallons a minute, both sit within six metres of the cells. The spill containment is in place before the electrolyte is.
Protect the people
Everyone in the room wears acid-resistant clothing and goggles or a face shield. They work with insulated tools rated for the DC voltage of the string, which is a higher requirement than the AC rating on the same tool. They have been trained to handle the chemistry in front of them, and they know what to do when something goes wrong. For a flooded cell that means knowing where the neutraliser is. For a lithium cell it means knowing where the exit is. A crew that has to ask is not ready.
Install in order
Receiving comes first. Check the shipment against the order and inspect it for transit damage. Check electrolyte levels on flooded cells. Measure the open-circuit voltage of every cell before it leaves the pallet, because a cell that is wrong now will be blamed on the installation later.
Positioning follows. Never lift a cell by its terminals. Keep 10 to 15 mm between cells for air, and level the cells on the rack.
Connection comes next. Use the manufacturer's torque, typically 11 to 16 Nm on an M8 bolt. Measure the torque, and do not judge it by feel. Put anti-corrosion compound on the terminals, and fit the temperature sensors where the drawing says.
Commissioning is last. Record the cell voltages against specification and the baseline impedance of every cell. Give the initial charge to the manufacturer's procedure. Record every reading in a form the next engineer can find.
Chemistry changes the checklist
A lithium installation needs Class D fire suppression and thermal-runaway detection. Its battery management system must be integrated and verified, and cell balancing must be confirmed before handover.
A nickel-cadmium installation needs cadmium handling procedures and tools that resist the alkaline electrolyte. It needs the manufacturer's first-charge protocol, typically to 140% of rated capacity, and a check of electrolyte specific gravity.
A lead-acid installation, valve-regulated or flooded, needs hydrogen detection and a verified acid-resistant floor. The ventilation calculation must be on file, and the float voltage must be corrected for the room's temperature.
The four mistakes that recur
The first is torque, both too little and too much. A loose joint heats, and a crushed post cracks. The second is a ventilation calculation that was never done, which is how hydrogen problems start. The third is mixed battery types in a single string. Cells of different ages and chemistries in series share current badly, and the weakest cell decides the outcome. The fourth is a missing thermal barrier between lithium modules. The barrier is a fire-safety requirement, not a preference.
Write it down, then hand it over
Record the installation date and crew, the baseline voltages and impedances, the torque values applied, every deviation from the specification and the commissioning results. In five years somebody will need to know whether a failing cell was always the odd one. The operating staff then need the normal parameters, the alarm conditions and the responses to them, the emergency shutdown and the routine inspection schedule. Give them these in writing, in a place where they will look.
If you are planning an installation, start the sizing at ebatt.ai. For questions about the room, use the contact page.