After a long outage in Palatine or Arlington Heights, the question always comes up: should we put in a standby generator, or one of those home batteries? In 2026 both are legitimate answers, and they solve slightly different problems. Generators run everything for days but need fuel and maintenance. Batteries are silent and instant but have a hard energy ceiling. This guide lays out the real trade-offs, costs, and the electrical work each one requires.
The Core Difference
A generator makes electricity as long as you feed it fuel. A battery stores electricity you already bought (or generated with solar) and hands it back until it is empty. That single distinction drives almost every decision.
| Factor | Standby generator | Home battery |
|---|---|---|
| Runtime | Days to weeks (natural gas: indefinite) | 8–24 hrs per charge, longer with solar |
| Transfer time | 8–20 seconds | Under 1 second (no flicker) |
| Noise | 60–70 dB at 20 feet | Silent |
| Maintenance | Annual service, oil, filters, battery | Essentially none |
| Fuel needed | Natural gas line or propane tank | None |
| Heavy loads (AC, well pump, range) | Handles easily with correct sizing | Limited by inverter output |
| Everyday value when the power is on | None | Time-of-use shifting, solar self-consumption |
| Typical life | 15–25 yrs | 10–15 yrs (warranty commonly 10) |
2026 Installed Cost Ranges
| System | Installed cost | What it typically covers |
|---|---|---|
| Generator, 14–18 kW, whole-home-ish | $9,500–$16,000 | Most circuits including one AC stage |
| Generator, 22–26 kW, true whole-home | $14,500–$24,000 | Everything, including 2 AC systems |
| Battery, single 13 kWh unit + backup panel | $14,000–$21,000 | Essential circuits for 8–14 hrs |
| Battery, 2 units (26 kWh) | $24,000–$34,000 | Most of the house, 12–24 hrs |
| Panel upgrade to 200 amp (if needed) | $3,200–$6,500 | Often a prerequisite for either |
| Gas line run to generator pad | $800–$2,800 | Depends on distance and meter capacity |
Battery pricing can be reduced meaningfully by the federal residential clean energy credit when the battery qualifies, and by Illinois program incentives that change periodically. Generators do not qualify for energy credits. Always confirm current incentive status before assuming a number — we will not quote a credit we cannot verify.
Which One Fits Your House
Choose a standby generator if…
- Your outages are long — multi-day storm or ice events, or you are on a feeder that historically takes a while to restore.
- You need to run air conditioning, a well pump, a sump and ejector pump pair, or electric cooking during an outage.
- You have natural gas at the house, which means effectively unlimited runtime.
- You want the lowest cost per backed-up kilowatt.
Choose a battery if…
- Your outages are short and frequent — an hour here, three hours there. Batteries excel at these and you never hear them.
- You already have solar. A battery makes solar useful during an outage; without one, a grid-tied array shuts down when the grid goes down.
- Noise, permitting setbacks, or lot size make a generator awkward — a common issue on narrow Arlington Heights lots.
- You want daily value: shifting usage away from peak-price hours and storing your own solar production instead of exporting it.
Or both
A growing number of our clients pair a modest battery with a mid-size generator. The battery covers the first hour seamlessly (no flicker, no clocks to reset), the generator carries the long haul, and the generator also recharges the battery. It costs more, but for a home office or medical equipment it is the most robust setup available.
The Electrical Work Behind Both
This is where projects go sideways, and it is the part homeowners rarely see in a sales brochure.
Transfer Equipment
Both systems require a transfer means that isolates your home from the grid — non-negotiable for lineworker safety. Options are a whole-home automatic transfer switch, a service-rated switch, or a “backup loads” subpanel that carries only selected circuits. Which one is right depends on your service size and what you actually want running.
Load Calculation and Circuit Selection
A proper load calculation determines what the system can carry. Batteries in particular are limited by continuous and surge inverter output, not just stored energy: a 13 kWh battery may store plenty of energy but still struggle to start a 4-ton AC compressor. Soft-start devices on the condenser solve some of this. If your panel is already crowded or still a 100-amp service, budget for an upgrade — see our circuits and wiring services for what that involves.
Permits and Placement
Palatine, Arlington Heights, and surrounding villages permit both installations and enforce setbacks from lot lines, windows, and gas meters. Generators have additional clearance and exhaust-direction requirements; batteries have listed spacing rules and, in some jurisdictions, restrictions on installation inside living space. A compliant layout is part of the design, not an afterthought.
Integration With Heating and Cooling
If you are considering a heat pump, plan backup around it. Heat pumps are backed up nicely by a generator and are a heavy lift for a single battery in winter. Conversely, if you have gas heat, backing up just the furnace blower is a small load either system handles easily — which changes the math substantially in the battery’s favor.
Operating Costs People Forget
- Generator fuel: a 20 kW natural gas unit at half load burns roughly 200–250 cubic feet per hour. Over a 24-hour outage that is meaningful but not painful — typically $25–$45/day at current rates.
- Generator maintenance: $250–$450/year for oil, filters, plugs, and a load test. Skip it and the unit will not start when you need it, which is the most common generator complaint we hear.
- Battery degradation: expect 60–70% of original capacity at year 10 under normal cycling.
- Monitoring: both benefit from cellular or Wi-Fi monitoring so you learn about a fault before the storm, not during it.
Frequently Asked Questions
Can a portable generator do the job?
For a few circuits, yes — with a properly installed inlet box and interlock so you are never backfeeding. Extension cords through a window and any “suicide cord” arrangement are both dangerous and illegal. A permanent inlet and interlock kit typically runs $900–$2,000.
How long does installation take?
Generators: one to two days of field work once the pad, gas, and permits are ready, plus commissioning. Batteries: one to two days. Permit timelines in our villages usually add two to four weeks.
Will a battery power my air conditioner?
Sometimes. A single-battery system can often run a smaller, inverter-driven or soft-started condenser, but not a conventional 4–5 ton unit at startup. Two batteries or a hybrid inverter with higher surge capability changes the answer.
Does a generator need to run periodically?
Yes — standby units self-exercise weekly or monthly for 5–20 minutes. It is normal, and it is how the unit proves it will start.
What about resale value?
Both are documented selling points in the north and northwest suburbs. Generators read as practical; batteries read as premium, especially on homes that already have solar.
Can I finance this?
Yes — Sunbit and PowerPay financing are available for backup power projects, including any required panel upgrade.
Start With a Load Assessment
The right answer depends on what you want running, how long your outages actually last, and what your existing service can support. MMDS does the electrical design, permitting, installation, and transfer equipment for both generators and battery systems across Palatine, Arlington Heights, and the surrounding suburbs. Full scope is on our electrical services page.
Call (847) 221-6280 or request a consultation. We will walk your panel, run the load calculation, and give you an honest side-by-side of generator versus battery for your house — including the option we think you should not buy.