SR500E – SR750E – Smartcharger 500W & 750W

Smart charger 500W And 750W – Boost Chargers

Smart Chargers or Boost Chargers
Helios Power Solutions Smart Battery Chargers or also known as Boost Chargers, are able to respond to the condition of a battery, modifying their charging actions accordingly. Our Smart Chargers are microprocessor controlled and allow for the maximum charge into your batteries to minimize the charge time. Boost mode allows for a high current, high voltage charging cycle, also allowing for the maximum charge into the battery in the shortest possible time. Float mode allows for the battery to be held at optimal voltage with a small trickle charge still being generated, to ensure that the battery is ready to when used.
Other features of our Smart Chargers include:
  • Designed to charge both sealed and flooded lead-acid battery types
  • Come with temperature compensation to ensure that the correct voltage is applied to the battery, irrelevant of the ambient temperature
  • Provide fully automatic battery recovery in the shortest possible time
  • Includes with both ‘boost’ and ‘float’ mode

A simple charger works by supplying a constant DC source to a battery being charged. The simple charger does not alter its output based on time or battery charge. This simplicity means that simple chargers are very cheap, although there is a trade-off in quality. A trickle charger is typically a low current battery charger, used to charge small capacity batteries.


Model Output Voltage¹ (float V) Output Voltage¹ (max boost A) Output Current (continuous A) Min – Max Battery (Ah)Size  
SR500E12 13.8 14.7 34 130-600
SR500E24 27.6 29.4 17 65-300
SR500E36 41.4 44.1 11.3 44-200
SR500E48 55.2 58.8 8.5 30-150
SR500E72* 82.8 88.6 5.6 22-95
SR500E91 * 110.4 117.6 4.2 16-75
SR500E92 * 124.2 132.8 3.7 15-65
SR500E93 * 138 147 3.4 13-60
SR750E12 13.8 14.7 50 200-900
SR750E24 27.6 29.4 25 100-450
SR750E36 41.4 44.1 16.7 66-300
SR750E48 55.2 58.8 12.5 50-220
SR750E72* 82.8 88.6 6 27-120
SR750E91 * 110.4 117.6 6.2 25-110
SR750E92 * 124.2 132.8 5.6 22-100
SR750E93 * 138 147 5 20-90
* Note: High voltage versions  SR750B72, 91, 92, 93 have  a manual  boost function.  Initiation of boost charge is by pushing the BOOST switch or relay contact. Termination of boost charge is by manual push button (FLOAT or STANDBY) or by the time set by the internal timer (BT setting).   They do not have a current terminated boost function.


Input STANDARD: 180V – 264VAC
Frecuency 50 or 60Hz ( to be specified at time of order)
Fusing Internal AC input fuse
Isolation 1KV DC input – output / earth
Efficiency > 85%
Inrush current Soft start circuit
Output voltages Refer to the model table
Voltage adj. range Approx 95 – 105% of V nominal
Temp. Compensation Temperature sensor on 1.7m lead with adhesive pad:  -4mV / °C / cell ±10%
Current Limit Constant current limit on overload & short circuit
Output Protection Automatic shutdown if battery leads reversed or short circuit on output
Line regulation < 0.2% over AC input range
Load regulation < 0.4% open circuit to 100% load
Noise <1%
Drift <0.1%
Hold-up time 15 – 20 ms (nom. – max. Vin) without  battery
OVP Over-voltage protection on output at ~ 130% of nominal output voltage
Thermal Protection Yes
Alarm & boost/float indication relays* Mains fail
Batt low (set at 1.83V/cell = 11, 22V, etc)
Alarm Relay Contacts C – NO – NC  full changeover   Rated 1A @ 50V DC or 32VAC
Output Volts May be adjusted to suit batery specifications
Adjustable Parameters All firmware parameters listed under features may be adjusted at time of ordering
Switch/ LED Indication & functions BOOST:  Red
FLOAT:  Green
STANDBY: Red (Push button to turn output off/on).
Refer to instruction manual  for full list of LED Operation codes
Factory Programmable parameters (default settings shown in brackets; please note that some parameters are interdependent of each other)*1 Start up in boost or float mode (Boost)
Current terminated boost  (Yes)
Current initiated boost  (Yes)
Start boost on mains return (Yes)
Pre-boost state timer 1-255 minutes (1)
Max boost charge time 1-48 hours (24)
Pre-float state timer 1-255 minutes (1)
Resume prior state upon mains return timer 1-255 minutes (10)
Resume on boost charge upon mains return 0-255 hours (24)
Pre-forced float timer 1-255 minutes (1)
Delay before mains fail recognition 4sec – 8.5minutes(5 minutes)
*1 except high voltage versions

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