Altronix MAXIMAL77EV Dual-Output 24VDC Power Supply Charger
The Altronix MAXIMAL77EV is a 220VAC-input, dual-output power supply/charger delivering two independent 24VDC channels at up to 10A each — designed for commercial access control and fire alarm installations where regulated, battery-backed power with granular supervision is non-negotiable. Housed in the BC800 enclosure (19"W x 26"H x 6.25"D), it accepts 220VAC input and is built around two AL1024XB2V sub-assembly boards, giving you a clear expansion path via field-installable Altronix sub-assemblies without pulling new infrastructure.
Overview
Where most single-output power supplies force you to daisy-chain or add a secondary unit when a second voltage domain is required, the MAXIMAL77EV delivers two fully independent, filtered and electronically regulated 24VDC outputs from a single 220VAC feed. Each output channel handles up to 10A, giving you 20A aggregate capacity — enough headroom for multi-door access panels, mag-lock banks, or distributed camera power when centralized runs are impractical. The unit is UL Listed (as sub-assembly components), CE Compliant, and carries TAA, NDAA, and BAA compliance out of the box, which matters for federal, state, and defense-adjacent projects that require domestic-sourcing attestation. Browse the broader Altronix power supply lineup to see how this unit fits within their MAXIMAL series architecture.
Key Features
- Dual 24VDC @ 10A Per Channel: Two isolated, electronically regulated output channels rated at 10A each provide a combined 20A capacity. Running mag-locks and an access panel on separate outputs means a short or surge on one circuit doesn't collapse the other — a meaningful fault-containment advantage on high-security doors.
- 220VAC Input with Wide Working Range (198VAC–256VAC): The 58V working window handles the voltage sag common on long commercial runs and older building distribution panels. At 6.25A draw and a 1,375VA system requirement, you can plan your circuit breaker allocation without margin guesswork.
- Instantaneous Failover to Battery: Upon AC loss, the unit switches to battery instantly — no relay delay, no power gap. For mag-lock applications on fail-secure doors, even a 50ms dropout triggers a lock cycle; this architecture avoids that. Supports up to four 12AH/12VDC sealed lead-acid or gel batteries within the enclosure, or 40AH/65AH in a separate enclosure for extended holdover time.
- Three-Way Supervision via Form C Contacts: AC fail, low battery, and battery presence each report via Form C dry contacts — the industry-standard normally-open/normally-closed pair that wires directly into virtually any access control panel's supervised input zone. Notification trigger for AC fail is selectable: 30 seconds (factory default) or 6 hours, so you can tune it to your monitoring policy without rewiring.
- Thermal and Short Circuit Protection with Auto Reset: Both output channels include built-in thermal protection and short-circuit shutdown with automatic recovery. On a multi-door panel, a field wiring fault won't require a site visit to reset a blown fuse — the unit recovers when the fault clears.
- 10A/250V Input Fuse: The power supply input fuse is rated at 10A/250V, giving you a hard upstream overcurrent limit that protects both the supply and the panel it feeds.
- BC800 Enclosure — Four-Battery Internal Capacity: The 16-gauge grey steel wall-mount enclosure accommodates up to four 12VDC/12AH batteries internally, with 1/2" and 3/4" combination knockouts for conduit entry. Rated for indoor use. At 42.3 lbs. (unit weight), plan for a two-person install on the wall mount.
- Expandable Sub-Assembly Architecture: Optional Altronix field-installable sub-assemblies add multiple outputs, relay switching, PTC protection, and application-specific features for fire alarm or access control — without replacing the enclosure or power core. This is the defining differentiator of the MAXIMAL line versus fixed-output supplies.
- NDAA / TAA / BAA Compliant: All three domestic-sourcing and federal compliance designations are verified for this SKU, satisfying procurement requirements on government, municipal, and DOD-adjacent projects without additional paperwork.
- Operating Range 0°C to 49°C: Rated for standard indoor commercial environments. Not suitable for unheated mechanical rooms or outdoor enclosures in cold climates — factor that into your IDF/MDF or electrical room placement.
- 246 BTU/Hr. Heat Dissipation: At full load, the unit dissipates approximately 246 BTU/Hr. In a sealed or low-airflow enclosure room, account for this in your thermal load calculations if multiple units are co-located.
Integration & Compatibility
The MAXIMAL77EV is designed as the power backbone for access control systems and fire alarm panels requiring 24VDC at scale. Its Form C supervision contacts integrate directly with common access control panels (Lenel, Software House, Genetec HID, Bosch, DSC, Honeywell) that accept supervised power input zones. The sub-assembly expansion system is Altronix-proprietary — AL400ULX, ALTV244, and related boards drop into the BC800 enclosure without additional hardware. Pair with a compatible Altronix battery enclosure if you need 40AH or 65AH holdover beyond the four internal battery slots. For 120VAC environments, evaluate sibling models in the Altronix MAXIMAL series before specifying this unit — the 220VAC input is fixed and non-configurable. Review your PoE switch and panel power budget against this unit's 1,375VA AC input requirement when sizing your electrical circuit.
What's in the Box
- 1x BC800 Enclosure (26"H x 19"W x 6.25"D, grey, 16-gauge steel, indoor wall mount)
- 2x AL1024XB2V Power Supply Charger Board (single fused output, 24VDC @ 10A, 220VAC)
Batteries sold separately. Optional Altronix sub-assemblies sold separately.
Frequently Asked Questions
Q: Is the MAXIMAL77EV NDAA Section 889 compliant?
A: Yes. The MAXIMAL77EV carries verified NDAA compliance, along with TAA and BAA compliance, making it eligible for federal, state, and defense-adjacent procurement requiring domestic-sourcing attestation.
Q: What batteries are compatible with the MAXIMAL77EV, and are they included?
A: The MAXIMAL77EV supports sealed lead-acid or gel-type 12VDC/12AH batteries. Up to four can be housed internally within the BC800 enclosure. For extended holdover, 40AH or 65AH batteries require a separate enclosure. Batteries are sold separately and are not included.
Q: What is the warranty on the MAXIMAL77EV?
A: Altronix provides a lifetime warranty on the MAXIMAL77EV per their published product documentation.
Q: Can the MAXIMAL77EV be used with 120VAC input?
A: No. The MAXIMAL77EV is designed specifically for 220VAC input (working range 198VAC–256VAC, 50/60Hz). It is not configurable for 120VAC. Specify a different MAXIMAL series model for 120VAC environments.
Q: How does AC fail notification work on the MAXIMAL77EV?
A: AC fail is supervised via Form C contacts. The notification trigger delay is field-selectable: 30 seconds (factory default) or 6 hours. This allows you to tune alarm sensitivity to your monitoring policy without hardware changes.
Q: Can the MAXIMAL77EV be expanded to add more outputs?
A: Yes. The MAXIMAL77EV is designed around Altronix's field-installable sub-assembly system. Optional Altronix sub-assemblies can be added to the BC800 enclosure to provide multiple additional outputs, PTC protection, relay switching, and application-specific features for access control or fire alarm systems.
The MAXIMAL77EV is one of those supplies I recommend specifically when a project calls for 220VAC input and you need dual independent 24VDC domains under one roof. The two AL1024XB2V boards each deliver 10A on separate fused circuits — so you're not sharing a single regulated rail across two door controllers or two lock banks, which is the failure mode I see constantly on cheaper single-output installs.
Technical Highlights:
- Dual Independent 10A Outputs: Each of the two 24VDC channels handles up to 10A independently — a short on one output won't collapse the other, which is critical on multi-door access control deployments where fail-secure mag-locks need continuous, stable power.
- Three-Way Form C Supervision: AC fail, low battery, and battery presence each report via Form C contacts with selectable AC fail delay (30 seconds or 6 hours). This maps cleanly to supervised input zones on Lenel, Software House, Bosch, and similar panels without additional relay boards.
- Instantaneous Battery Failover: Switchover on AC loss is instantaneous — no relay gap. Combined with internal capacity for four 12AH/12VDC batteries (or up to 65AH in a separate enclosure), you can design holdover windows matched to your site's power reliability profile.
Deployment Considerations:
- The BC800 enclosure weighs 42.3 lbs. fully assembled before batteries — budget for a two-person wall mount, and verify your mounting surface can handle the load, especially with four internal batteries installed.
- The 220VAC input is fixed; there is no dual-voltage configuration. If the installation site uses 120VAC distribution, this is not the right unit — confirm panel voltage before specifying the MAXIMAL77EV on your BoM.
This unit earns its place on multi-tenant commercial buildings and government facilities where the 220VAC infrastructure is already in place, NDAA/TAA/BAA compliance is a procurement requirement, and the system designer wants a clear expansion path via Altronix sub-assemblies without pulling a new enclosure on the next phase.
