The SR SmartCharger is designed to recharge your battery in the shortest practicable time with programmable parameters to suit your specific application.Smartcharger 250W

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.




ModelOutput Voltage¹ (float)Output Voltage¹ (max boost)Output Current (continuous)Min – Max Battery Size2
SR250E1213.814.716.7A65-200 Ah
SR250E2427.629.48.3A30-100 Ah
SR250E3641.444.15.6A22-70 Ah
SR250E4855.258.84.2A15-50 Ah
¹ May be adjusted to suit battery specifications
²  Guidelines only.   Please check manufacturer’s recommendations.


InputSTANDARD: 180V – 264VAC
FusingInternal AC input fuse
Isolation1KV DC input – output / earth
Efficiency> 85%
Inrush currentSoft start circuit
Output power250W
Output voltagesRefer to the model table
Voltage adj. rangeApprox 95 – 105% of V nominal
Temp. CompensationTemperature sensor on 1.7m lead with
adhesive pad:  -4mV / °C / cell ±10%
Current LimitConstant current limit on overload & short circuit
Output ProtectionAutomatic 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
Drift0.03% / °C
Hold-up time15 – 20 ms (nom. – max. Vin) without  battery
OVPOver-voltage protection on output at ~ 130% of nominal output voltage
Thermal ProtectionYes
Alarm & boost/float indication relays*Mains fail
Batt low (set at 1.83V/cell = 11, 22V, etc)
Alarm Relay ContactsC – NO – NC  full changeover   Rated 1A @ 50V DC or 32VAC
Adjustable ParametersAll firmware parameters listed under features may be adjusted at time of ordering
Switch/ LED Indication & functionsBOOST:  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)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 0-48 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)