September 23, 2021

High Power 24V (27.2V) power supplies with for audio and battery backup applications.

1340 watt power supply for marine and commercial audio use

Due to voltage-fold back current protection, these high current, high efficiency power supplies can be used in parallel with 24V lead acid batteries in order to provide extra power boost during surges, as well as battery backup capabilities.

Most 24V systems that are made to work with vehicles or in aircraft are 27.2 or 28 volts during charging. That is why the nominal voltage is 27.2. They can be adjusted down to 24V if desired.

PST-APS-100

Suggested Applications: Audio Display, Demo & Show Vehicles Marine & Recreational Vehicles; Battery maintenance & storage Retail Store Displays Industrial Applications (available in 24V output) Communications

High efficiency, switchmode power converters. These AC-DC power supplies have a nominal output voltage of 27 volts. They 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.
These AC/DC Power Converters 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. DLS series power supplies may be used with or without a battery. When combined with a high quality battery, DLS units can supply transient surges up to 500 amps. Can also be used in installations where use of a battery is not possible.
All models offer dual voltage output. (27VDC - 28.8VDC) with a removable jumper accessible from the outside.
Virtually Silent Operation All DLS Power Supplies 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 Power Supplies 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 supplies. The switch mode technology utilized in DLS Power Supplies boasts 86% efficiency. This superior design results in cooler operating temperatures and compact size.
Up to six of these lightweight power supplies (identical models only) can be connected in parallel for even greater current capability.

Summary table high power 27 volt power supplies
Model number	Continuous Amps	Watts	Weight	UL listed?	Dimensions	Mounting Drawing	AC Service Required	Price
PST-DLS27-15	15A	405	4.5 lbs	UL, cUL	9.7 x 6.7 x 3.4 inches including bracket		108-132VAC 7.3 Amps 580VA	$219
PST-DLS27-25	25A	675	5.0 lbs	UL, cUL	9.7 x 6.7 x 3.4 inches including bracket		108-132VAC 12.2 Amps 864VA	$276
PST-DLS27-40	40A	1100	7.8 lbs	UL, cUL	9.7 x 6.7 x 3.4 inches including bracket		108-132VAC 19.5 Amps 1296VA	$339
PST-DLS-240-40	40 Amp 220VAC input	740	7.8 lbs	UL, cUL	9.7 x 6.7 x 3.4 inches including bracket		216-264 VAC 5.5 Amps 1200VA	$490
PWS1505-110-24	50 Amp 90-130 VAC 220VAC field configurable	1360	15 lbs	No	17"x8.2"x3.5"		1782VA	$1372

**The dual-voltage feature allows the voltage to change from 27 to 28.8 volts by inserting jumper into a socket on the outside of the charger.

Typical AC outlets are 1540VA, 14 amp service. To run the higher power units you will need higher power service. 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 line.

Specifications

DLS Specifications
Parameter	Value
Output voltage	27.2 or 28.8	Adjustable between about 22 and 30 volts with screwdriver
Output voltage tolerance	±0.7%	no load
Maximum ripple and noise	100 mV RMS
Input voltage rage	108-132 VAC
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
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
Ambient temperature	0°C to 40°C
Storage temperature	-20°C to 80°C
Warranty	2 Years

Drawing for the low noise power supply, 9 inch version

Click the drawing for a large view of the drawing for the 15A and 25A versions

For a drawing of the 40A version click here

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High power 24 volt power supplies, 27 volt, 28.8 volt

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