Altronix MAXFIT75F Dual-Output Power Supply with Battery Backup
Overview
The Altronix MAXFIT75F is a dual-output power supply and charger system housed in the compact BC750 wall-mount enclosure, engineered for commercial security installations where both 12VDC and 24VDC loads need to run from a single, supervised source. It delivers 24VDC at 10A and 12VDC at 10A simultaneously — enough headroom to drive a mixed panel of cameras, access control readers, and door hardware without splitting the run across separate chassis. The BC750 enclosure keeps the footprint to 16.5"W x 20.5"H x 6.25"D, so it fits in IDF closets and wiring rooms where rack space is constrained.
Key Features
- Dual 10A Outputs (12VDC and 24VDC): Running both voltage rails at full 10A simultaneously means you can power a mixed load — 24V access control hardware alongside 12V cameras — from one supervised source. No second enclosure, no second conduit run.
- Instantaneous Battery Failover: On AC loss, the unit switches to battery instantly, with no perceptible gap for connected devices. The BC750 enclosure holds up to four 12V/12AH batteries internally, giving you up to 48AH of onsite reserve without a separate battery cabinet. (Batteries sold separately.)
- Battery Presence and Low-Battery Monitoring: Form C contacts report AC failure and battery status to your monitoring panel. If battery voltage drops below 71–73% (12V units) or 70–75% (24V units), the unit shuts down DC outputs to prevent deep discharge — protecting batteries from the failure mode that most shortens their service life.
- Fire Alarm Disconnect (Supervised): Latching or non-latching FAD with 10K EOL resistor supervision built in — no external relay required to meet supervised FAD requirements on UL-listed fire alarm integrations.
- Aux Power-Limited Output @ 1A: The unswitched 1A auxiliary output stays live through the main DC shutdown logic, useful for powering monitoring devices or small always-on loads that need isolation from the main DC bus.
- Over-Voltage Protection and Filtered/Regulated Outputs: Both rails are filtered and regulated, which matters when you're powering sensitive electronics like IP cameras or card readers that can't tolerate rail sag under load swings.
- LINQ2 Network Module Ready: The LINQ2 network communication module (sold separately) integrates with the MAXFIT75F to enable remote monitoring and diagnostics via Altronix's LINQ platform — useful for distributed sites where a truck roll to check power supply status isn't acceptable.
- Indoor Wall-Mount Enclosure, 0°C to 49°C: Rated for 32°F to 120°F operating environments, which covers most mechanical rooms and telecom closets. The BC750 is a steel indoor wall-mount chassis — not rated for outdoor or wet locations.
Integration and Compatibility
The MAXFIT75F accepts 120VAC 60Hz at up to 8A input, standard US commercial power. The dual-voltage output suits installations combining 24VDC access control panels (HID, Lenel, Software House readers commonly specify 24V) with 12VDC analog or IP cameras on the same power zone. The LINQ2 add-on module extends the unit into networked power management, compatible with Altronix eFlow Series and MaximalF charger families. Sealed lead-acid or gel-type batteries are supported; extended capacity (40AH or 65AH) is achievable with a separate battery enclosure for longer standby requirements.
Frequently Asked Questions
Q: Can the MAXFIT75F power both 12VDC and 24VDC devices at the same time?
A: Yes. The unit provides 24VDC at 10A and 12VDC at 10A simultaneously from two separate power supply/charger modules housed in the BC750 enclosure.
Q: How many batteries does the BC750 enclosure hold?
A: The BC750 enclosure accommodates up to four 12V/12AH batteries internally. Batteries are sold separately. Extended capacity (40AH or 65AH) requires a separate battery enclosure.
Q: What happens when AC power fails?
A: Failover to battery is instantaneous on AC loss. The unit also monitors for low battery and will shut down DC outputs if battery voltage drops below approximately 71–75% to prevent deep discharge damage.
Q: Does the MAXFIT75F include supervised fire alarm disconnect?
A: Yes. The unit includes a supervised fire alarm disconnect that supports both latching and non-latching modes with a 10K EOL resistor — no external relay is needed.
Q: Can the MAXFIT75F be monitored remotely?
A: Yes, with the optional LINQ2 network communication module (sold separately). LINQ2 adds remote monitoring and diagnostics capability compatible with Altronix eFlow and MaximalF series hardware.
Q: What is the warranty on the MAXFIT75F?
A: Altronix provides a lifetime warranty on this product per the manufacturer's published warranty policy.
The MAXFIT75F is the unit I spec when an integrator needs to consolidate two power zones into one supervised enclosure without giving up output headroom. The dual 10A rails — 24VDC and 12VDC running concurrently — cover the mixed-voltage load profile you see on virtually every access control and camera hybrid job, and the BC750 chassis does it in a 16.5" x 20.5" x 6.25" footprint that fits standard wiring closet layouts.
Technical Highlights:
- Dual Concurrent 10A Outputs: 24VDC at 10A plus 12VDC at 10A simultaneously — enough for a 16-door access panel and a camera riser on the same source, without load-sharing compromises.
- Deep-Discharge Protection: Output shutdown triggers at 71–73% of 12V nominal (or 70–75% on the 24V side), which is the threshold that determines whether a sealed lead-acid battery survives past its second replacement cycle. This alone justifies the unit over an unsupervised alternative.
- Four-Battery Internal Capacity: Up to four 12V/12AH cells fit inside the BC750 enclosure — 48AH on-board without a satellite battery cabinet, which buys meaningful standby time on a mid-size installation.
Deployment Considerations:
- The BC750 is an indoor wall-mount enclosure only. If the IDF or wiring closet runs hot (above 49°C/120°F in summer), route cooling before installing — the operating ceiling is firm.
- Batteries are sold separately and are not included. Budget for four 12V/12AH sealed lead-acid or gel cells if you need full onboard standby capacity, and factor in the LINQ2 module if the site requires remote power diagnostics.
The MAXFIT75F is the right call for multi-tenant commercial buildings and campus access control deployments where mixed 12V/24V loads, supervised monitoring, and onboard battery reserve need to share a single, maintainable power point in a confined wiring closet.
