Standby and Portable Generator Installation in New Hampshire

What a Standby Generator Covers

A standby generator covers whatever it has been sized and wired to cover, which is less obvious than it sounds and is where most of the disappointment in this subject comes from. A generator does not simply power the house. It powers the circuits connected to it, up to the capacity of the unit.

There are two arrangements. A critical-loads panel feeds a chosen set of circuits, typically heat, well pump, refrigeration, some lighting and outlets, and the internet. Everything else stays dark. Whole-house means the generator carries everything, which needs a larger unit and usually load management so it can shed heavy circuits when demand peaks.

That decision drives the size of the unit and therefore most of the cost, so it is worth making deliberately rather than by default, and it is answered alongside what the house actually draws. A household that genuinely needs the heat on, the water running and the freezer cold is buying a different machine from one that wants the house to behave normally.

Where you are in New Hampshire changes the answer more than anything else, because a house in Manchester, Nashua or Concord is usually back on quickly and one out towards Henniker, Weare, Deering or the Lakes Region may not be.

Automatic and Manual Transfer Switches

Because without one you can put power onto the utility line and kill somebody, and that is not a dramatization. It is the specific failure transfer switches exist to prevent.

When the grid is down, line crews work on conductors they have isolated and expect to be dead. A generator connected to a house without a transfer switch can backfeed through the service and out onto that line, where the transformer steps it back up to full distribution voltage. The crew has no way to know. This is why backfeeding through a dryer outlet with a double-ended cord, which people genuinely do, is both illegal and lethal.

A transfer switch physically prevents the utility supply and the generator from ever being connected at the same time. An automatic switch does it by itself, sensing the outage, starting the generator and switching over, typically within half a minute. A manual switch or an interlock does the same thing mechanically with you throwing it.

Both are legitimate, both are inspected, and it is the first thing an inspector looks at.

Standby Generators Against Portable Generator Hookups

They solve the same problem at very different levels of cost and convenience, and the right answer depends more on the household than on the machines.

A portable generator is wheeled out, fueled with gasoline and started by hand. A portable generator hookup with a proper inlet and interlock runs about $650 for the electrical work, and that is a legitimate, code-compliant, inspected installation rather than a compromise. What you accept is that somebody has to be home, go outside in whatever caused the outage, start it, and refuel it every several hours.

A standby generator sits on a pad, runs on propane or natural gas, starts itself when the power goes and shuts down when it returns. Installed, a standby system runs $10,000 to $20,000 depending on size and location, and that figure is the whole system with the unit included rather than the wiring alone.

What usually decides it is whether anyone is reliably home. A house empty during the week, or a Lakes Region property unoccupied for months around Meredith, Wolfeboro or Alton, gets nothing from a portable nobody is there to start, and that is also where an unnoticed outage does the most damage.

Sizing a Generator From the Circuits You Need

It is worked out from the running load of the circuits you want covered plus the single largest starting surge, and the second half is where most oversizing happens.

Anything with a motor draws far more in its first second than once it is turning. A well pump running at a thousand watts can pull three thousand to start. The generator has to survive the worst moment, which is the largest motor starting while everything else is already running.

So the correct sizing is running total plus the biggest single surge, not the running total plus every surge added together. Two motors almost never start in the same instant, and sizing as though they might buys thousands of watts that will never be used. It is the most common reason a showroom figure is larger than the house needs.

Our generator sizing tool does exactly this calculation, and our guide to standby generators covers the rest of the decision.

What a Generator Installation Involves

Siting, a pad, the fuel, the electrical work and the inspection, and the order matters because several of them constrain each other.

The unit sits on a pad, level and clear, at a distance from the building the manufacturer and the town both have views on. The electrical run goes from the unit to the transfer switch and from there to the panel or the critical-loads panel, so the distance between those three points is a real part of the cost.

Fuel is the other constraint. Natural gas where it is available means no tank and no refueling. Propane, which is what most of rural New Hampshire uses, means a tank sized for a meaningful run time, and that sizing is part of the planning rather than an afterthought.

Then the permit and the inspection. There may be siting requirements from the town covering distance from the property line and noise, and those are worth establishing before the pad goes in rather than after. Where the generator is going in because of repeated outages, storm and mast damage is often the reason it came up.

Servicing and Exercising a Standby Generator

Yes, and it is the part people underestimate when they buy one. A standby generator is an engine that sits outside doing nothing for months and is then expected to start, take load and run for days in the worst weather of the year, usually unattended.

They self-exercise, typically running briefly each week or month to circulate oil and keep everything free. That is automatic and it is the minimum rather than the whole of it. Oil and filters need changing on a schedule. The battery needs replacing every few years and is the single most common reason a generator fails to start. The air filter needs attention, and the transfer switch and connections should be checked.

The failure nobody plans for is discovering the problem during the outage, at two in the morning in an ice storm, which is precisely when nobody is available to fix it.

For a property unoccupied for stretches, remote monitoring is worth having. Knowing the generator failed is considerably better than arriving to find out what happened while it was failing.

Well Pumps, Septic Pumps and Rural Properties

Yes, provided it has been sized for the starting surge, and on a rural New Hampshire property those two loads usually set the size of the unit.

A well pump is the classic case. It runs at a modest figure and starts at three times that, and it is also the load you least want to lose, because a house on a private well has no water at all when the power goes rather than reduced pressure. A septic pump is the same problem in the other direction.

Add oil or propane heat that needs electricity for the burner and circulators, and a rural house without power in February loses heat, water and waste at the same time. That combination is the whole argument for backup power out towards Weare, New Boston, Deering, Antrim and the Monadnock towns.

Both usually sit on dedicated circuits already, which makes connecting them to a critical-loads panel simpler than it sounds.

Where Backup Power Earns Its Cost in New Hampshire

It depends far more on where the house is and how it is lived in than on the state as a whole.

Outages here are a fact of winter. Ice storms take down conductors and limbs across the wooded parts of the state, and restoration is prioritized by the number of customers on a line. A dense street in Manchester or Concord gets attention early. A rural line serving a handful of houses gets attention later, sometimes days later, and that difference is the entire argument.

The other multiplier is what the house depends on. Municipal water and sewer in the cities means a genuinely lower stake. A private well, a septic pump and fuel heat that needs power means a much higher one.

If the outage also exposed how little capacity the panel had left, that is a service conversation rather than a generator one, and the two are worth pricing together.