February 12, 2024

High Power 24V battery chargers with very low noise for lithium iron phosphate 8 Cell batteries

More lithium iron phosphate chargers

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 lithium iron 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 LiFe and an IQ4LIFEPO charge controller allows the APS Power Supply to operate as an automatic 2-stage “smart charger.” This gives a sophisticated charger with Bulk 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) lithium iron phosphate battery chargers
Model number	Continuous Amps	Watts	Weight	Charge algorithm	Dimensions	Mounting Drawing	AC Service Required	Price
PST-DLS-27-15/IQ4LIFEPO 3-stage charger	15A	400W	4.5 lbs	3 stages	9.7 x 6.7 x 3.4 inches including bracket		108-132VAC 7.3 Amps 580VA	$239
PST-DLS-27-25/IQ4LIFEPO 3-stage charger	25A charge current	675W	5 lbs	3 stages	9.7 x 6.7 x 3.4 inches including bracket		108-132VAC 12.2 Amps 864VA	$314
PST-DLS-27-40/IQ4LIFEPO	40A charge current	1100W	7.8 lbs	3 stages	9.7 x 6.7 x 3.4 inches including bracket		108-132VAC 19.5 Amps 1296VA	$376

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Specifications:

Specifications for DLS charger with APS-IQ4LIFEPO charging controller
Parameter	Value	Notes
Battery	24 Volt 8 Cell lithium iron phosphate
Output voltage	24.9V Bulk charge phase 27.2V 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 27.2 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.

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