Backup Power for an OSBB

Who is responsible for what

Backup power for an OSBB requires four roles, and confusion between them is the most expensive mistake. Below is a division that works in practice. It does not replace the charter or the law; it helps break the work into tasks.

Separately, appoint a person responsible for the technical side: this can be the OSBB’s electrician or an invited consultant. They will be the single point of contact with the engineer, and the collection of datasheets is best handed to them.

Stages from idea to commissioning

1. Goal and boundaries. State what exactly must work and for how many hours. Write it in one sentence for each priority tier, for example: “water and emergency lighting for long outages, the elevator only for releasing people”.
2. Data and preliminary calculation. Collect the datasheets and run the calculator. Take a printout with the stated assumptions to the meeting with the engineer.
3. Engineering survey. The design engineer visits the site and checks the phases, panels, space for equipment and the possibility of working with a generator or batteries.
4. Technical brief. The board turns the survey results into a technical brief: list of loads, required hours, room requirements, warranty, maintenance.
5. Offers and selection. Compare not prices but conformity to the technical brief. The contractor must explain motor starting and the temperature limits of the batteries.
6. Decision and fundraising. Residents’ decisions are made under the law and the charter. The platform helps set up the fundraising page, but money goes only to the OSBB’s account.
7. Commissioning. Ask for an explanation of how the backup is switched on, how to verify it works and who maintains the batteries or generator.

Phased delivery instead of “everything at once”

For most buildings it is wiser to split the work into phases. This strategy reduces the one-off burden on residents, gives time to collect data and lets you check how the first phase performs before investing in the next.

• Phase one: safety (tier 0) and minimal life support (tier 1): emergency lighting, low-voltage systems, pumps, releasing people from the elevator.
• Phase two: more backup runtime, the elevator in working mode, heating substations if they belong to the building.
• Phase three: grounds, video surveillance, solar panels that reduce grid consumption and can charge the batteries.

It is important that the first phase is designed with headroom for the following ones: space, cable routes, inverter capacity and the ability to add battery modules. This is a question for the design engineer, and it affects the choice of system architecture.

Which documents to request from the engineer and contractor

• A survey report with the list of loads, phases and assumptions.
• A calculation of power and energy stating the formulas, margins and unknown data.
• A single-line diagram showing the changeover device between the grid and the backup.
• A specification with datasheets and technical characteristics of the main components.
• Warranty and maintenance terms for the batteries, inverters or generator.
• Instructions for residents and maintenance staff: what to do during an outage.
• Commissioning certificates and inspection records.

Typical OSBB mistakes

• Starting with fundraising rather than a list of loads. The amount then changes and residents’ trust drops.
• Replacing the technical brief with one contractor’s sales proposal.
• Assuming that solar panels alone will power the building during an outage. Without a hybrid mode and batteries, a grid-tied plant does not feed the building during an outage.
• Not planning maintenance: batteries and generators need regular checks.
• Not telling residents what will work and what will not, and getting disappointment instead of gratitude.

How to compare contractors’ offers

Comparing commercial offers for backup power is hard because each bidder writes them differently. One technique helps: give everyone the same list of loads, the same backup hours per tier and the same document requirements. Then the difference between offers will be explained by equipment and service, not by a different understanding of the task.

Beware of offers with no assumptions or limitations at all: they sound confident but make it impossible to verify what is actually promised. A supplier that is a partner of any platform has no automatic advantage: what decides is conformity to the technical brief.

Checklist for the board before the residents’ meeting

How to talk to residents without disappointing them

A technically correct solution can fail socially if residents expected something else. The most frequent cause of conflict: everyone understands the word “backup” in their own way. Some expect light in their apartment, some an elevator for the entire day, some water on all floors. That is why it helps to show a simple table at the meeting: what will work, for how many hours according to the calculation, and what is not included in the first phase.

• Do not promise specific hours of backup runtime: state the calculated range and the conditions under which it applies.
• Explain separately that apartment sockets are not part of the OSBB’s backup.
• Show which data is still unknown and when it will be clarified.
• Publish the list of documents the engineer reviewed and the place where they can be viewed.
• After commissioning, give residents short instructions: what switches on automatically and what requires action from the dispatcher.

Honest communication before fundraising also protects the board: if the goal, boundaries and assumptions are written down, it is easier later to explain why the elevator works only in rescue mode or why the pump is powered but the yard is not.

After commissioning: who maintains the system and how

Backup power is not equipment you can install and forget. Batteries age, a generator needs test runs, and software settings can be lost after an emergency shutdown. That is why, before purchase, the technical brief should state who performs scheduled checks, how often, and what happens if the contractor stops providing service.

What to do next

If the list of loads and the goal are defined, move on to the preliminary calculation and then to preparing the fundraiser. For technical details, use the dedicated pages on elevators, pumps and backup runtime; questions of authority and contributions are covered in the section on OSBBs.

Frequently asked questions

Can the board choose and buy backup power equipment on its own?

The board’s authority depends on the charter and the decisions of the general meeting, so a purchase of significant size should be agreed with residents. Technical parameters are confirmed by an engineer.

Do we need a design engineer if the equipment is small?

For safety systems and elevators, yes. Even a small system touches the common panel, phases and protection, and mistakes there are dangerous, so the survey is performed by a qualified company.

Next steps

Preliminary backup power calculationRegister your OSBB on the platformDirectory of OSBB fundraisers