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March 27, 2019

High Power 24V battery chargers with very low noise for marine, display room, and trade shows

More lead acid battery chargers 6V, 12V, 18V, 36V, 42V, 48V
1340 watt power supply for marine and commercial audio use line drawing of the high power low noise audio power supplies

Summary: Most high power battery chargers have significant 60 or 120 Hz ripple and noise. Others used pulse charging technology. This causes havoc with systems such as audio systems that would like a nice, clean voltage. These chargers are designed to charge a battery at high power, but very quietly.

Suggested Applications: Wherever a high power 24 volt battery charger is used, for example in in Audio Displays, Demo & Show Vehicles Marine & Recreational Vehicles; Battery maintenance & storage, Retail Store Displays, Industrial Applications, Communications (available in 12V, 36V and 48V output).

These chargers are the famous DLS power supply with 24 Volt taper charging charging built-in. The optional APS-IQ4 charge controller allows the APS Power Supply to operate as an automatic 3-stage “smart charger.” This gives a sophisticated charger with Bulk, Absorption, and Float stage charging, increasing the charging capacity of the APS Power Supply to decrease charge times, insuring proper and safe battery charging and eliminating over-charge. This “intelligent” technology monitors the battery at all times.
These AC input switchmode chargers are ideally suited for the mobile environment. These power supplies feature regulated and filtered outputs which allow for clean audio demonstrations without the slightest hint of noise.
Their low profile design allows for convenient mounting under a display vehicle or behind a display board. When combined with a high quality battery, APS units can supply transient surges up to 1000 amps.
In maintenance mode the charger is left connected to the battery. If the voltage remains in the long term stage for more than seven days, the charge controller will automatically deliver a boost charge for a short time, then automatically return to the normal float stage to prevent sulfation.
Virtually Silent Operation. All PST-DLS chargers utilize an advanced switching design. There is no low frequency transformer hum. Every unit is equipped with a cooling fan that is virtually silent.
The PST-DLS 24V battery chargers all feature thermal control circuitry that engages the fan only when internal temperatures require it (typically 75% of full load). They have small compact sizes compared to the transformer based power chargers. The switch mode technology utilized in DLS power chargers has 86% efficiency. This superior design results in cooler operating temperatures and compact size.
These 24 Volt chargers were originally designed to power automobile audio systems in demonstration rooms and trade shows. They have very low ripple and no audio noise. Other output voltages can be made upon request.

Summary table high power 24 volt (27 volt) lead acid battery chargers
Model number Continuous Amps Input Voltage Watts Weight Charge algorithm Dimensions Mounting Drawing AC Service Required Price
PST-DLS-24-15 15A, 110V input 108-132 VAC
47-63 Hz
7 Amps max
400W 5.5 lbs 3 Stage 10.5x6.5x3.4 inches click here for mounting drawing 805VA $254.00
PST-DLS-27-25 25A, 110V input 108-132 VAC
47-63 Hz
12 Amps max
675W 6.5 lbs 3 Stage 10.5x6.5x3.4 inches click here for mounting drawing 1380VA $327.60
PST-DLS-27-40 40A, 110V input 108-132 VAC
47-63 Hz
20 Amps max
1100W 7.8 lbs 3 Stage 13x6.5x3.5 inches click here for mounting drawing 2300VA $605.00
PST-DLS-27-40-220 40A, 240V input 216-264 VAC 1100W 7.8 lbs 3 Stage  13x6.5x3.5 inches  click here for mounting drawing 2300VA 645.00
APS-IQ4 IQ4 controller, turns the APS series into multi-stage chargers by inserting its control cable into the control socket of the APS   $28.00
PST-APS-HK4 4 gauge hook-up kit with quick-release connectors 8 foot cables             $64.00
* These are designed to exceed UL requirements.
Specifications for DLS charger with optional APS-IQ4 charging controller
Parameter Value Notes  
Battery 24 Volt sealed lead acid, flooded lead acid, VRLA, gel, or AGM    
Output voltage 29.5V Bulk charge phase
28.3V Absorption charge
27.1V Float charge phase
This 24V charger can be left on indefinitely without overcharging the battery. The float charge phase keeps the battery maintained to prevent sulfation.  
Output voltage tolerance ±0.7% no load  
Maximum ripple and noise 100 mV RMS    
Input voltage rage 108-132 VAC (220V models 216-264VAC)    
Input frequency 47-63Hz    
Typical efficiency >80%    
Short circuit protection Yes    
Overload protection Yes    
Line regulation <1%    
Load regulation <1% at output terminals  
Recommended output wire gauge 4 AWG    
Input cable 30 inches long    
Output terminals 4 AWG screw terminals    
Fan control Proportional-- Fan only comes on when needed  
Fan type Special ultra low audio noise fan     
Over temperature protection 80°C Turns off  
Storage temperature -20°C to 80°C    
Ambient temperature 0°C to 40°C    
Warranty 2 Years    

Usage Note: Typical AC outlets are 1540VA, 14 amp service. To run the higher power units you will need higher power service than is typically available in a wall plug. Please consult competent technical authorities to determine the total load on the circuit you intend to supply the power with, including other things plugged into the same circuit.

Maintenance mode: After the 24VDC battery is full, the charger goes into a maintenance mode. In maintenance mode the battery is safely floated at 27.1 volts to maintain the battery and replace charge lost due to leakage or self discharge. In addition, if the battery has not received a bulk charge during a seven-day period, the charge controller will switch the APS Power Supply into a pre-programmed equalization stage to top off the batteries, dissolving any sulfate layer on the battery’s plates and avoiding stratification of flooded batteries.

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