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Phase Three Modular Series: 24V


A Battery Charging System with Redundant, Easily Replaced Charge Modules Providing High Reliability and Serviceability


The Phase Three Modular (PTM) Concept

The PTM charger provides a significant improvement in system reliability by utilizing multiple independent charger modules that plug into the unit, and should a fault occur in one module, the system continues to operate, thus is considered “fault”.

The system consists of a wall mount case which serves as connection point to AC input and battery output, (3 bank) and contains three front-facing power bays, each accommodating a 22.5 amp charger module which slides and locks in place creating a 24V, 67 amp charger. If a module fault occurs, a front panel indicator and alarm relay is activated and the system continues operating on the other modules. A fourth bay houses the “smart” controller circuit that provides 3 step charging, temperature compensation, system status LED’s, alarm contacts and indicators. Should the controller suffer a fault, the charger will still operate at full power at float voltage mode. The controller module is also configured for easy plug in replacement in the field.

Vessel operators appreciate this system approach to reliability and serviceability whereby a fault in one of the modules is easily identified and it can be quickly replaced with an on-hand spare or an exchange unit from the factory, all the while the charging system and the vessel continue to operate.


Redundant, independent 22.5 amp charger modules increase reliability – a malfunction of one does not disable the charging system; remaining modules continue to operate.[/cs_text][cs_text]

ServiceabilityPTMS Module white back

  • Module change-out takes only minutes via plug and play configuration while the system continues to operate
  • Technical personnel not required
  • No need to remove the charger case from the boat or disconnect any wiring
  • No inconvenience of power interruption to the boat


  • Three stage “smart” charging; bulk, absorption, float
  • Battery type selector switch; gel-cell, lead-acid, AGM
  • Temperature compensated output via sensor
  • 24 Volt; 22-67 amps
  • “Universal” input of 90-264 VAC, 50-60 Hz. – can be used anywhere in the world
  • Powder coated stainless steel case
  • ABS approved as redundant power system for essential services as well as a battery charger

General System Specifications


Voltage/Frequency: 90-264 VAC, 47-63 Hz, single phase; derate linearly from 100% output @ 105 VAC to 80% output @ 90 VAC
Amperage: 18 @ 120 VAC; 9 @ 230 VAC
Power Factor: .96-.99
Efficiency: 85% typical


Output Amps: 67 total
Nominal Charge/Float Voltages: Gel-Cell: 28.0 VDC @ 50% load/27.2 @ .5A load; Flooded/AGM: 28.4 @ 50% load/26.8 @ 5A load
Temperature Compensation (Option): – 5 mV per cell per ˚C (typical), requires optional sensor model TCS-12/24
Battery Banks: 3
Recommended Battery Type/Capacity: Gel-Cell, Flooded or Sealed Lead-Acid, 120-600 A-H

Status Indicators/Signal Outputs

Output OK, No Output, Check System, Battery Too Hot, Total Output Bar Graph, Output
Voltage Test Points, Contacts for Optional Remote Alarm

Temperature Rating

0-60˚ C; derate linearly from 100% output @ 50˚ C to 80% output @ 60˚ C


Case Material: Powder Coated Stainless Steel
Weight: With three modules installed: 34 lbs/15.5 kg.;
Empty: 16 lbs/7.3 kg.
Cooling: Forced air per module

Individual Module Specifications

Model: PTM-24-22 (24 volt)
Input Voltage/Frequency: 90-264 VAC; 47-63 Hz; derate linearly from 100% output @ 105
VAC to 80% output @ 90 VAC
Input Current: 3 amps @ 230VAC; 6 amps @ 115 VAC
Output Current: 22.5 amps max in Bulk Phase; 20 amps max in Absorption/Float Phases
Power Factor: .96-.99
Efficiency: 85% typical
Protection Features: Input Fuse, Output Fuse, Current Limiting, Over Voltage Protection,
Cooling Fan, Automatic Thermal Shutdown/Recovery
Status Indicators: Output OK/FAULT
Weight: 6 lbs.

Optional Accessories

Temperature Compensation Sensor: Model TCS-12/24 with 25′ of cable


ABS type approved redundant power system for essential services and as a battery charger, UL Recognized; E183223, Level 3
Safety: EN60950-1 USA, Canada, Europe EMI Radiated and Conducted: FCC Part 15 Level A; EN55022 Class A

Model Modules
Output Amps
Max Input Amps
@ 115/230 VAC
Dimensions (H x W x D) Weight
Inches Centimeters Lbs. Kgs.
PTMS-24-67 3 67 18/9 20.9 x 10.9 x 8.8 53.1 x 27.7 x 22.4 35 16