Solar vs Battery vs Hardwired House Numbers

Every lit house number needs power from somewhere, and the choice you make there decides how reliable it will be for the next ten years. Solar sounds easiest. Battery sounds simplest. Hardwired sounds like the most work. Only one of those impressions is accurate.

This is an honest comparison, including where each option disappoints.

The short version

	Hardwired	Plug-in	Solar	Battery only
Reliability	Highest	High	Depends on sun	Lowest
Ongoing maintenance	None	None	Clean panel, replace cells eventually	Regular changes
Install effort	Highest	Low	Lowest	Lowest
Runs all night in winter	Yes	Yes	Often not	Not for long
Best for	Permanent install on the house	Outlet nearby	Mailbox, gate, monument	Renters, temporary use

Hardwired: the one to pick if you can

A transformer converts household power (120 to 240V AC) down to 12V DC, and a low voltage cable feeds the characters. Once it is in, there is nothing to maintain, nothing to remember and nothing to replace.

Why it wins: identical brightness every night of the year, in any weather, for as long as the LEDs last. No cord visible. No seasonal fade. Add a dusk to dawn sensor and you never touch it again.

The catch: you need a power source you can reach, and someone has to make the mains connection. Plenty of homeowners do this themselves in an afternoon. If you are not comfortable with household wiring, this is the option worth paying an electrician an hour for. Everything on the 12 volt side is low voltage and simple.

Worth knowing: a backlit character draws roughly 6 to 12 watts depending on size, so a four-character address left on every night costs about $18 to $36 a year to run. Running cost is never the deciding factor here.

Plug-in: the practical compromise

The same 12V DC transformer, but with a plug on the end for an existing outdoor outlet.

Why it works: all the reliability of hardwiring with none of the mains wiring. You can be up and running the same afternoon. It also gives you the easiest route to smart control, because a smart plug turns the whole thing into something you can schedule from your phone.

The catch: a visible cord, unless you can route it behind trim, through a soffit, or into the wall. If the outlet is more than a few feet away, this is the difference between a clean install and an obvious one. Paintable raceway in the wall colour solves it well.

One thing to check: outdoor outlets are usually on a GFCI circuit. That is good for safety, but a GFCI that trips takes your address light with it, and you may not notice for days.

Solar: genuinely useful in the right spot, disappointing in the wrong one

A panel charges a battery during the day, and the battery runs the LEDs at night. No wiring at all.

Where solar is the right answer: a mailbox post at the end of a long driveway. A gate pillar with no conduit. A free-standing address monument out in the yard. Anywhere that running a cable would mean trenching. In those places solar is not a compromise, it is the only sensible option.

Where solar disappoints, and this is the part most pages will not tell you:

• Shade is fatal, not merely unhelpful. A panel under a tree, beside a tall hedge or in the shadow of the house for half the day may collect a fraction of the energy it needs. Dappled shade counts as shade.
• Orientation matters more than people expect. In the northern hemisphere a panel wants to face south and be tilted up. A panel mounted flat on a north-facing wall is close to useless.
• Winter is the real test. Short days, low sun angle and heavy cloud all stack up at the same time of year when nights are longest. A solar unit that runs happily until 2am in July may fade out by 9pm in January.
• Snow and dust. A panel covered by snow produces nothing. Dust and pollen build up over a season and quietly cut output.
• Batteries age. The rechargeable cells inside a solar unit lose capacity over a few years. Runtime shortens gradually, which is easy to miss until it stops working.

The rule of thumb: if the panel location gets at least six hours of genuine direct sun on a clear day, and you can reach it to clean it, solar works well. If you are talking yourself into a location that gets "a few hours in the afternoon", pick a different power source.

Battery only: rarely the right answer

Some lit numbers run on replaceable or rechargeable batteries with no panel at all.

Where it makes sense: renting somewhere you cannot drill or wire. A temporary address marker during construction. A short-term fix while you plan a permanent install.

Why it is not a long-term solution: lighting an address is a dusk-to-dawn job, roughly ten to fourteen hours a night, every night. That is a lot of energy to ask of a battery. In practice you either accept dim output, accept that it only runs for a few hours, or change batteries far more often than you want to. And the failure mode is silent. The light simply is not there on the night someone needs it, and you find out later.

If you need a wire-free install, a solar unit with a properly sited panel is a much better version of the same idea, because it recharges itself.

A fourth option people forget: your landscape lighting

If you already have low voltage landscape lighting running across the front of the house, you have 12 volt power a few feet from where your numbers are going.

One caution: landscape systems are usually 12V AC, and backlit numbers run on 12V DC. You need a small converter between the two. Do not connect directly.

Done properly this is an excellent option, because the numbers come on with the rest of the front lighting and share its timer or photocell.

Which should you choose?

• Numbers on the house, and you can reach power: hardwired, with a dusk to dawn sensor. This is the right answer for most people.
• Numbers on the house, outdoor outlet nearby, no appetite for mains wiring: plug-in transformer with a smart plug.
• Existing 12V landscape circuit out front: tie in through a converter.
• Mailbox, gate pillar or monument away from the house, in real sun: solar.
• Renting, or a temporary marker: battery, and treat it as temporary.

Common questions

Can I use my doorbell transformer?

No. Doorbell transformers are typically 16 to 24V AC and sized for a chime that runs for two seconds. Wrong voltage, wrong current capacity. Use a dedicated 12V DC driver.

How long do solar house numbers last on one charge?

It depends entirely on the panel's sun exposure, the season and the battery's age, which is why honest numbers are hard to quote. A well-sited panel in summer will usually carry the night. The same unit in shade, or in midwinter, often will not.

Do lit numbers use much electricity?

No. Roughly 6 to 12 watts per character depending on size. A typical address costs about $18 to $36 a year even left on all night.

Can I switch power sources later?

Usually yes. The characters themselves are 12V DC regardless of how you generate that, so changing from plug-in to hardwired later means changing the transformer, not the numbers.

What about smart home control?

Easiest on a plug-in setup with a smart plug. For hardwired, use a low voltage controller or a smart relay on the supply side. For solar, most units are self-contained and controlled only by their own light sensor.

The short answer

Hardwired is the most reliable and the right default when the numbers are on the house. Plug-in gets you almost all of that with none of the mains work. Solar is excellent for mailboxes, gates and monuments with real sun exposure, and frustrating anywhere shaded. Battery only is a temporary measure, not a solution.

Our backlit LED house numbers run on 12V DC and work with a hardwired transformer, a plug-in transformer, a landscape converter or a solar power bank, so you can pick the power source that suits your house rather than the other way round. A dusk to dawn sensor, timer and dimmer are all available as options.