All-in-One vs Split Solar Street Lights: Which Fits Your Project
An all-in-one light puts panel, battery, controller and luminaire in a single head, which makes it fast to install and simple to deploy but concentrates heat in one place and fixes the panel’s orientation to the luminaire’s aim. A split system separates the panel, the battery and the luminaire, which allows an optimum panel tilt, keeps the battery out of the hottest zone and gives easier access for replacement, at the cost of more parts, more wiring and more installation labour. Match the choice to the temperature, the access, the theft risk and the lighting class you have to meet.
What the two formats actually are
A split solar street light is the layout most people picture: a photovoltaic panel on a bracket at the top of the pole, a luminaire on an arm aimed at the road, a battery in a box on the pole or buried in the foundation, and a controller at the pole base. Each element is chosen and replaced separately.
An all-in-one light integrates all of it into one housing at the top of the pole: the panel forms the upper face, the LED array and optics sit underneath, and the battery and controller share the body. The attraction is fewer parts, no exposed cabling, one unit to mount and no separate battery box to buy or bury.
Thermal behaviour — the decisive difference in hot climates
An all-in-one head holds a photovoltaic panel, an LED array and a battery within a few tens of centimetres of each other. The panel’s back face runs hot when generating, the LED and its driver add their own losses directly underneath, and the assembly sits in full sun at the top of a pole. Even with separated thermal zones and a light-coloured body, the battery in an all-in-one unit typically sees higher temperatures than one in a pole-base or buried box.
A split design lets the battery be lowered, shaded or buried in a chamber where soil temperature stays well below air temperature, and heat is the main driver of battery ageing. Where summer daytime temperatures reach 40 °C with little shade, the split arrangement is usually the more durable choice; in a mild climate, or for a short deployment, the difference narrows. Some all-in-one designs mitigate this with a slide-out battery, a vented compartment or a heat-spreading structure — details worth asking about rather than assuming.
Energy yield and panel orientation
In a split system the panel can be tilted to suit the site’s latitude while the luminaire is aimed where the light is needed. In an all-in-one unit the panel’s tilt is fixed by the angle that throws light onto the road, so energy harvest and light distribution compromise with each other: where a road is lit from a tilt of around 10–20° but the site’s latitude calls for 25–35°, the panel is not at its best angle. Setting the two independently can change annual yield noticeably and, in the worst month, be the difference between meeting the design and not. Note too that an all-in-one head usually faces its panel toward the road, which is not always the direction of maximum exposure.
Mechanical and wind considerations
An all-in-one head is a compact but substantial box with a large flat area; a split system spreads the same material over a bracket, an arm and possibly a battery box lower down. Both create wind load, and the structural calculation must use the actual projected area in the worst orientation. All-in-one heads concentrate that load at a single point, which can require a heavier pole and base plate, so check that the pole supplied with such a system was designed around the head’s real dimensions rather than the luminaire’s alone.
Installation, commissioning and maintenance access
- Installation. An all-in-one unit arrives assembled with sealed connections, so site work is mostly mounting and securing. A split system has more wiring, glands and torque checks, and therefore needs more skilled labour per pole.
- Commissioning. Both need controller settings verified. On an all-in-one unit the settings are usually reached through a remote control, an app or a sealed port; if that route is locked to the supplier, the client loses control of the installation.
- Routine service. Cleaning the panel and reading the controller are similar. Battery replacement is not: on a split system the battery usually sits within reach at the pole base, while on an all-in-one unit it may require the head to be lowered, or the pole to be climbed.
Theft, vandalism and exposure
A split installation exposes more cable, which in some regions is a theft target, and the panel on its bracket is a removable object. An all-in-one head is compact and valuable, and its theft takes the whole system at once — but it exposes almost no cable. The measures are the same for both: tamper-resistant fasteners, security or welded fixings, buried or locked battery compartments and, where possible, a supervised location. On a remote, unwatched site a split design with a buried battery loses the least value if a panel is taken, while an all-in-one loses everything.
Which format suits which project
| Situation | Usually better fit | Why |
|---|---|---|
| Roads lit to a formal traffic class | Split | Higher output, independent aiming, larger panel |
| Hot climates with high summer temperatures | Split | Battery away from the hottest zone |
| Campuses, yards, car parks | Either | Moderate output; all-in-one if trees and access allow |
| Fast deployment with limited labour | All-in-one | Fewer connections, shorter installation time |
| Remote, unwatched sites with cable theft | All-in-one or split with buried battery | Minimal exposed value and cabling |
| Long design life with planned maintenance | Split | Component-level replacement and servicing |
In practice many schemes mix the two: a split format on the main carriageway where lighting performance is contractual, and all-in-one units on internal roads, paths and parking where a lower performance threshold applies and installation speed matters. Specification details for both formats are in how to specify solar street lights in a tender, with pole and spacing decisions in pole height and spacing. Our split systems, all-in-one units and street light poles pages show the configurations we can source.
How we can help
We are a China-based trading and project sourcing company, not a manufacturer. We review specifications and BOQs, match a product and configuration to your site conditions, source from qualified manufacturers, and manage quality through to pre-shipment inspection. If you are preparing a tender or specification and want a second opinion, contact us.