How we're different
Oversized is not engineered
The common pattern in this trade: read the panel, round up, sell the bigger unit, install it, hand over a manual, and leave. It closes fast and it looks safe. Three years later the fuel is stale, the start battery is dead, the warranty has lapsed for want of service records, and the owner has a very expensive object on a concrete pad. We do the other thing. We engineer the load, publish the numbers, and stay on the unit.
Side by side
Two ways to buy the same generator
Same brand, same pad, same crew size. The difference is entirely in what happens before the quote and after the handover.
Stage
Typical install
No Outages
Sizing
TypicalReads the service amperage or sums nameplates, then rounds up a frame size or two for comfort.
No OutagesMeasured demand where practical, NEC 220 calculation with demand factors, motor inrush and step-load acceptance checked against the specific frame.
Load priorities
TypicalNo shed scheme. Everything is on the generator, so the unit has to be big enough for the worst case that never happens.
No OutagesLoads sorted into must-run, should-run, and can-wait, with the shed scheme implemented in hardware and commissioned.
Growth
TypicalOversizing is offered as the growth plan, with no figure attached to it.
No OutagesSpare capacity stated in kW and percent, planned loads modeled, and provisions (conduit, ATS poles, panel space) installed now.
Documentation
TypicalA manufacturer manual in a plastic sleeve.
No OutagesLoad hierarchy, sizing basis, commissioning readings, and an exercise schedule: a package you can hand to a lender, insurer, or inspector.
Handover
TypicalKeys, a quick demonstration, and the customer becomes responsible for maintenance they were never briefed on.
No OutagesController walkthrough, full-load test, written exercise cadence, and enrollment in a maintenance plan before we leave the site.
Year three
TypicalStale fuel, dead start battery, unread fault log, and a lapsed warranty on a unit that will not start.
No OutagesDocumented annual service, battery load tests, fuel sampling, and a warranty that is still intact because the records exist.
Real numbers
What actually goes into the calculation
An engineered study is a set of measurements and code-basis figures you can hand to a lender, an inspector, or the next contractor. Every item below appears in the study we give you.
- Measured demand
- Where the service allows it, we log actual demand over a representative period instead of reading the number stamped on your panel. Panel amperage is a capacity rating, not a load.
- Motor starting current
- Locked-rotor and inrush figures for every well pump, compressor, chiller, auger, and shop motor, the values that decide whether a unit carries the site or nuisance-trips on the first start.
- NEC 220 calculated load
- A code-basis calculation with demand factors applied, so the number survives plan review and the AHJ inspection instead of being defended in the field.
- Diversity and duty cycle
- What actually runs at the same time. Summing nameplates is how a 22 kW site becomes a 60 kW quote.
- Non-linear and harmonic loads
- VFDs, LED drivers, switching supplies, and UPS input stages distort current. They change both alternator selection and UPS topology.
- Altitude and temperature derate
- Montana sites run at elevation and through deep cold. Engine output derates with altitude; batteries and starting systems derate with temperature. Both go into the sizing.
- Step-load capability
- Generators accept load in steps. We check the block-load acceptance of the specific frame against your largest single start, rather than assuming headroom covers it.
Load shedding
A shed scheme beats a bigger frame
Sizing for the theoretical worst case (every motor starting at once, at noon in August, with the shop running) buys a unit that will never see that load. Prioritizing the loads instead usually lands a smaller, better-loaded, cheaper unit that carries what matters.
Must run
Should run
Can wait
The shed scheme is implemented in hardware: load-management modules, contactors, or a controller with priority logic. It is documented and commissioned, not left as a note in the manual telling you to remember to switch things off.
The oversizing penalty
A bigger unit is not a safer unit
Wet stacking
Cost you don't recover
Worse fuel economy
Siting friction
No reliability gain
Harder to maintain
Growth options
Sized for today, planned for what you already know is coming
Right-sizing is not under-sizing. The study separates what you run now from what you have told us is coming, and prices both paths.
- Documented headroom
- Every study states the spare capacity in kW and in percent, at your actual power factor, not a vague 'room to grow'.
- Phase-two loads on paper
- The shop addition, the second freezer bank, the clinic wing, the irrigation pivot. Planned loads are modeled now even if they are funded later.
- Provisions instead of rework
- Spare ATS poles, oversized conduit, a stubbed gas line, and panel space cost little at install and save a re-excavation later.
- Expandable UPS
- Rack topologies that accept added battery strings or a second module, so protected runtime grows without replacing the frame.
- A written upgrade path
- If growth exceeds headroom, the study names the next step: a parallel unit, a frame swap, or a shed-scheme change, well before you are surprised by it.
Maintenance is part of the engineering
How a good generator becomes a brick
Install-and-leave is the failure mode we see most often. Nothing on this list is exotic; each one is an ordinary consequence of nobody being responsible for the unit after the invoice cleared.
- Stale fuel
- Diesel absorbs water and grows microbial contamination in two to three years of standby duty. A plugged filter at hour zero of an outage is indistinguishable from a dead generator.
- Dead start battery
- The single most common no-start cause we see. A battery that reads fine at rest can fail under cranking load, which is why we load-test rather than voltage-check.
- Unread fault log
- Controllers record failed exercise cycles. Nobody reads them on an unmaintained unit, so a unit can fail every weekly self-test for a year and look fine from the driveway.
- Lapsed warranty
- Manufacturer coverage generally requires documented, on-schedule service by an authorized dealer. Miss the records and a covered alternator or controller failure becomes an out-of-pocket repair. That is the point at which a generator becomes a very expensive pad ornament.
Every system we install leaves on a maintenance plan. Documented loaded runs, recorded voltage, frequency and temperature readings, battery load tests, fuel sampling, and a service history you can produce for a manufacturer claim, an insurer, or a regulator. See what a visit covers →
Why this is the authority position
The legislation created the risk. Engineering is the mitigation.
DOE Order No. 202-26-37 (July 26, 2026) lets the grid operator direct private backup generation as a last resort, and Montana HB 490 gives Montana utilities a legal basis to de-energize lines on purpose. Both shift exposure onto the facility owner. Neither is mitigated by owning a large generator; they are mitigated by owning a system whose capacity, priorities, and condition are known and documented.
A facility with a measured load hierarchy, a commissioned shed scheme, and a current service record can state exactly what it can carry, for how long, and on what fuel. That is the difference between being a directable resource of last resort and being a facility in control of its own power.
Read the order summary →What documentation buys you
- A defensible answer for an insurer or lender asking about continuity
- Warranty claims that survive review because service history exists
- Clean handoff to your AHJ, plan reviewer, or compliance auditor
- A known runtime figure under a multi-day shutoff assumption
Get the numbers before you get a quote
The free load study is where this starts: measured and calculated load, a shed scheme, documented growth headroom, and an installed price range within 48 hours.