Altronix MAXFIT11E Dual-Output Expandable Power Supply with Battery Backup Enclosure
Overview
The Altronix MAXFIT11E is a dual-channel expandable power supply system built for commercial security installations that need both voltage flexibility and on-site battery backup. Housed in a wall-mount BC750 enclosure measuring 16.5"W × 20.5"H × 6.25"D, it delivers 12VDC or 24VDC from each of its two independent power supply/charger modules — simultaneously if your system demands both. If you're wiring a mix of 12V and 24V devices on the same installation (access control panels, door strikes, cameras, lock hardware), the MAXFIT11E consolidates power distribution into a single enclosure rather than scattering separate supplies across the ceiling or backroom. Explore the full Altronix power and access control lineup for compatible controllers and accessories.
Key Features
- Dual Independent Outputs (12VDC @ 4A or 24VDC @ 3A per channel): Each of the two power supply/charger modules operates independently, so you can run 12VDC on one and 24VDC on the other simultaneously. This eliminates the need for separate supplies when a single head-end location serves mixed-voltage devices — common in access control and camera hybrid deployments. Total available current is up to 8A across both channels at 12VDC.
- Four-Battery Internal Capacity (12AH / 12VDC each): The enclosure accommodates up to four sealed lead-acid or gel-type 12VDC/12AH batteries internally — no external battery cabinet required for standard retention requirements. For extended runtime (40AH or 65AH configurations), a separate enclosure is supported. Batteries are sold separately, so size your backup window before ordering.
- Instantaneous AC Failover: Upon AC loss, the system switches to battery without interruption. For door access and alarm I/O loads where even a brief power gap trips a fault condition, instantaneous failover keeps supervised circuits stable through utility outages.
- Form C Supervision Contacts (AC Fail + Battery): Both AC failure and battery conditions are reported via Form C dry contacts — the standard interface for integration into alarm control panels, access control systems, and monitoring stations. You get hardwired, panel-reportable supervision rather than relying on software polling.
- LED Status Indicators (Input, DC Output, Battery): Three on-board LEDs indicate 115VAC presence, DC output status, and battery discharge or disconnection. Field technicians can verify system health at a glance during commissioning or service calls without pulling out a meter.
- Over-Voltage Protection and Filtered/Regulated Outputs: Class 2 rated, power-limited outputs with over-voltage protection and filtering mean downstream devices receive clean, stable DC — important for access control readers and camera equipment that can misread or reset on noisy or spiked power rails.
- 5A/250V Input Fusing: The input is protected by a 5A/250V fuse (with 7A rated input draw at 115VAC 60Hz). Replacing a blown fuse in the field is a seconds-long task, not a module swap.
- Thermal Envelope 0°C to 49°C Operating: Rated for operation through 49°C (120°F) — suitable for IT closets and mechanical rooms that can get warm, though not for unventilated exterior enclosures or direct-sun installs.
Integration and Compatibility
The MAXFIT11E is designed for commercial-grade security power distribution and pairs naturally with access control panels, electric locks, door strikes, and alarm peripherals drawing 12VDC or 24VDC. The dual-channel architecture is particularly well-suited to installations running a mix of reader voltages or combining camera and access power in a single managed location. Form C supervision contacts wire directly into standard alarm panels and access control systems — no proprietary interface required. For larger battery runtime needs, Altronix supports configurations up to 40AH and 65AH via external enclosures, which is worth planning for high-security or UPS-critical applications. Review your power supply sizing guide before finalizing battery count and AH requirements. The MAXFIT11E carries a manufacturer lifetime warranty — confirm applicability to your specific purchase at point of sale. Pair this unit with compatible access control hardware to complete a fully supervised power and entry management system.
Frequently Asked Questions
Q: Can the MAXFIT11E output 12VDC and 24VDC at the same time?
A: Yes. The two independent power supply/charger modules can each be configured for different output voltages, so the unit can deliver 12VDC from one channel and 24VDC from the other simultaneously.
Q: How many batteries does the MAXFIT11E enclosure hold, and what type are supported?
A: The BC750 enclosure accommodates up to four 12VDC/12AH batteries internally. Supported battery types are sealed lead-acid and gel. Batteries are sold separately. For larger backup windows (40AH or 65AH), a separate external enclosure is required.
Q: What happens to connected loads when AC power fails?
A: Failover to battery is instantaneous upon AC loss — no interruption to connected devices. The AC failure condition is simultaneously reported via a Form C dry contact for panel or monitoring station integration.
Q: Does the MAXFIT11E include supervision outputs for integration into an alarm panel?
A: Yes. Both AC fail and battery conditions are reported via separate Form C (normally open/normally closed/common) dry contacts, which wire directly into standard alarm control panels and access control systems.
Q: What is the operating temperature range for the MAXFIT11E?
A: Operating range is 0°C to 49°C (32°F to 120°F). Storage temperature extends from -20°C to 70°C. The unit is rated for indoor wall-mount installation only — it is not designed for outdoor or unenclosed exterior environments.
Q: What warranty does the MAXFIT11E carry?
A: Altronix provides a lifetime warranty on the MAXFIT11E per manufacturer documentation. Confirm warranty terms at point of purchase.
The MAXFIT11E is the unit I reach for when an installation has mixed-voltage loads in a single head-end location and the integrator doesn't want to mount two separate supplies. The dual-channel design — each channel independently configurable for 12VDC @ 4A or 24VDC @ 3A — means one enclosure can feed a 24VDC mag-lock while simultaneously powering 12V readers or camera infrastructure, with battery backup on both channels through a single BC750 cabinet.
Technical Highlights:
- Four internal batteries (up to 48AH total at 12VDC): Fitting four 12AH cells inside the enclosure covers the vast majority of commercial access control backup requirements without a secondary battery cabinet — saving both wall space and wiring time in tight IDF/telecom room installs.
- Form C supervision on both AC and battery: Hardwired dry contacts for AC fail and battery status plug directly into any alarm panel or access control system. This isn't a software heartbeat — it's a panel-reportable hardwired condition, which satisfies most AHJ and monitoring station requirements for supervised power.
- Class 2 power-limited, filtered and regulated outputs: Downstream devices — readers, strikes, sensors — receive clean regulated DC. The over-voltage protection is a practical detail that matters when you're sharing a circuit with inductive lock loads that generate transients on release.
Deployment Considerations:
- The input draw is rated at 7A from 115VAC 60Hz — verify your panel circuit is appropriately rated and that the branch circuit isn't shared with high-draw HVAC or similar loads that could trip the breaker during battery recharge cycles when the supply is running at full output current.
- The 49°C (120°F) operating ceiling sounds generous, but telecom and electrical rooms in warm climates or poorly ventilated buildings can exceed this during summer peaks — confirm ambient temps before mounting, especially if four batteries will be charging simultaneously (adds heat load).
The MAXFIT11E fits best in mid-scale commercial access control deployments — multi-door office suites, school campuses, or retail back-of-house installations — where a mix of lock voltages and panel-supervised power monitoring is required within a single, organized wall-mount footprint.
