Gate Automation Battery Backup UK¶

Guide to battery backup systems for UK automatic gates, including UPS sizing, 24V battery types, solar charging, and compliance with BS EN 12453.

Why Battery Backup Is Essential for UK Automatic Gates¶

Battery backup ensures that your automatic gate remains operational during a mains power failure - a common occurrence in UK winter storms and rural areas. The Supply of Machinery (Safety) Regulations 2008 and BS EN 12453 both recommend that automated gates retain safety functionality during power loss, meaning the gate must still detect obstructions and reverse direction even on battery power. A 24V DC gate opener is inherently battery-ready, whereas 230V AC units require a separate uninterruptible power supply (UPS) to bridge the gap. A basic battery backup solution for a 24V swing gate operator starts at £150 including a 7 Ah sealed lead-acid battery, providing approximately 20 full open/close cycles. For higher-use sites, a 17 Ah or 26 Ah battery extends this to 50 - 80 cycles. Solar-compatible systems with a 20 W or 40 W solar panel and charge controller cost £300 - £600 and are popular for rural UK gates where mains cabling is impractical. Lithium iron phosphate (LiFePO4) batteries offer longer life and deeper discharge cycles at £200 - £400.

Sizing, Installation and Maintenance Best Practices¶

Sizing a battery backup for a UK gate automation system requires calculating the daily cycle count and the maximum idle period without mains recharge. For a typical residential gate cycling 8 - 10 times per day, a 12V 17 Ah battery offers around 72 hours of autonomy - sufficient for a long weekend power cut. Installation involves connecting the battery to the control board via a dedicated charging circuit; most 24V gate controllers from BFT, Came, and DoorHan have an integrated trickle charger. The battery must be housed in a weatherproof ventilated enclosure mounted at least 300 mm above ground to avoid flood damage. For UPS systems paired with 230V operators, the UPS must be rated at minimum 500 VA and provide pure sine wave output for the gate motor's inverter. Battery maintenance for sealed lead-acid types requires terminal cleaning every 6 months and full replacement every 3 - 5 years. LiFePO4 batteries typically last 8 - 10 years and include built-in battery management systems (BMS) that prevent over-discharge and short-circuit damage.

Specifications and Comparison¶

Battery Type	Typical Cost	Capacity (Ah)	Cycles on Full Charge
Sealed Lead-Acid (SLA) 7 Ah	£150 - £250	7 Ah	~20 cycles
Sealed Lead-Acid (SLA) 17 Ah	£200 - £350	17 Ah	~50 cycles
Sealed Lead-Acid (SLA) 26 Ah	£250 - £450	26 Ah	~80 cycles
LiFePO4 12V 20 Ah	£300 - £600	20 Ah	~100 cycles + longer life

FAQ¶

Do UK building regulations require battery backup for automatic gates?: BS EN 12453 and the Supply of Machinery (Safety) Regulations 2008 strongly recommend that safety functions remain operational during power loss. Battery backup is the most practical way to achieve this for 24V systems.
How long does a gate battery backup last without mains power?: A 17 Ah battery paired with a standard 24V residential gate operator typically provides 50 - 80 open/close cycles, equating to 2 - 4 days of normal use depending on daily cycle frequency and gate weight.
Can I add solar charging to my existing automatic gate?: Yes, provided your gate controller has a charge controller input. A 20 W or 40 W solar panel kit with charge controller costs £200 - £400 and is compatible with most 24V BFT, Came, and DoorHan controllers. For more information see our Automatic Gate Opener Installation UK.

Last updated: 2026-05-31.

External Resources¶

For further information consult authority guidelines at the National Security Inspectorate.