Power & wiring
Powering motorized shades: battery, hardwired, or solar?
How a shade is powered decides more than you'd expect — retrofit difficulty, whether it keeps working in an outage, how big a shade you can drive, and how much ongoing maintenance you sign up for. Here's the plain-English tradeoff.
Rechargeable battery
Battery motors (usually a rechargeable Li-ion pack) are the easiest retrofit — no opening walls, no electrician — and they keep working in a power outage because they're self-contained. The tradeoffs: you recharge them periodically (cadence depends on shade size, weight and how often they cycle), and battery motors generally produce less torque, so they're less ideal for very large or heavy shades.
Hardwired (low- and line-voltage)
Hardwired motors never need recharging and deliver more torque and tight synchronization across banks of shades — ideal for large openings and whole-home installs. Low-voltage DC (e.g. 24V) is the quiet, compact, integration-friendly choice and its wiring is easier to run; line-voltage (120V AC) can drive larger assemblies but installation is an electrical job and AC tubular motors tend to be louder. The catch: wiring is best done at new-construction or renovation, and most hardwired shades stop in an outage unless on backup.
Solar charging
A small photovoltaic panel trickle-charges the battery, cutting or eliminating recharge chores — but only where the window gets strong, unobstructed sun (ideally south-facing). Fabric and size options can be more limited.
A simple rule of thumb
Battery (or solar-assisted battery) for retrofits, rentals and smaller shade counts; hardwired low-voltage for new construction and serious whole-home projects where you want no recharging and perfect sync. The right answer depends on your walls, shade sizes and tolerance for maintenance — which is exactly what we sort out in a consultation.
- Retrofit, minimal disruption → battery / solar
- New build or big/heavy shades → hardwired low-voltage
- Strong sun exposure → solar-assisted
- Whole-home sync and zero recharging → hardwired
Frequently asked
Do motorized shades work during a power outage?
Battery and solar-charged motors keep working (they're self-contained). Hardwired motors usually stop unless they're on a backup supply.
How often do shade batteries need recharging?
It varies with shade size, weight and daily cycles — larger/heavier shades and frequent movement shorten the interval. Solar charging can greatly extend or eliminate manual recharging on sunny windows.
Keep exploring
Sources & methodology
This is an independent overview synthesized from official manufacturer and standards documentation — not copied marketing. We publish only what we can source, and flag anything that needs manufacturer or project confirmation. Specifications change; confirm details for your specific project.
- U.S. Department of Energy — Energy-Efficient Window Coverings (exterior most effective)
- Somfy — Sonesse 24V DC low-voltage motor
Last reviewed: 2026-07-10
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