Missouri Wind and Solar - Wind Power Experts since 2008


SkyMAX 12/24 Volt AC Converter Smart Battery Charger


Converter Charger Features:

  • Large charging capacity design (75 Amp for 12VDC; 37.5 Amp for 24VDC) charges a 100 amp hour battery in under an hour up to 90% charge

  • Power supply up to 75 amps at 12VDC or 37.5 amps at 24VDC

  • Three stage smart charger with variable charging voltage algorithm for maximizing battery life (bulk, absorb and float)

  • 4 pre-programmed charging algorithms using the dip switches for the most common charging profiles

  • Charges lead-acid, AGM, GEL and LiFPO4 batteries

  • Adjustable charge current control dial to safely charge smaller battery(s)

  • Wide input voltage range, 70 VAC to 145 VAC for unstable inputs

  • Reverse polarity, over voltage, under voltage, short circuit, over temperature protections

  • High AC to DC converting efficiency design >80%

  • Smart fan control for maximizing the performance and fan life

  • Includes battery temperature sensor port to help maintain the life of the battery(s) (battery temperature sensor not included)

  • AC input cord - 4ft

  • 2 Year warranty



Input Voltage

96-145VAC full performance


70-96VAC automatically de-rate to 50% of full load current


40Hz to 70Hz

Nominal Input Current at Rated Output


Voltage Measurement Accuracy


Frequency Measurement Accuracy




Nominal Voltage

12/24 VDC manual adjustable

Output Current

Input voltage 96-145V,

output current 75A for 12V mode

output current 37.5A for 24V mode


Input voltage 70-96V,

output current 37.5A for 12V mode

output current 18.75A for 24V mode

Rated Output Current

Manual adjustable

Current Accuracy

± 6% of full rated output current @25°C, for target currents across the range from 10% rated output (for absorption exit criteria accuracy) to the current limit set point.

Load Regulation


Current Limit

75-80 Amp

Dead-Battery Charging

8-14.9VCat 100% of rated output current


8-29.8VCat 100% of rated output current

Selectable Battery Type

Open Lead-Acid, Gel, AGM, LiFePo4, adjustable

Parallel Outputs

Maximum of two AC converter units connected in parallel





Input Over Voltage

Unit must be safe for input voltage up to 150VAC RMS (and up to 215V peak), need not be operating. Above this level the unit may be damaged.

Reverse Battery Polarity Protection

Non-destructive reverse battery polarity protection with fuses. Unit shall not sustain damage and shall meet all specifications after fuse replacement.

Input Under-voltage

Unit must not be damaged for all input voltages from 0-300VAC. Shutdown or input current limit or other means may be applied when

input voltage is out of normal operating range.

Output over voltage

12/24V mode


Unit will shut down if

Vcharging > Vcharging (target) + 1.0VDC for more than 2 seconds; unit will restart when voltage <=

Vcharging (target) for more than 2 seconds.For battery OVP the unit will restart in the same stage.



Unit will shut down if

Vcharging > Vcharging (target) + 1.5VDC for more than 2 seconds; unit will restart when voltage <=

Vcharging (target) for more than 2 seconds.For battery OVP the unit will restart in the same stage.

Charger over temperature protection

The internal temperatures of the charger will be measured by NTC. Based on these measurements,

unit will shut down if the temperature exceeds 105°C.

Unit will restart when environment temperature cools to 95°C.

BTS(Battery Temperature Sensing)

The battery temperature sensor allows the charge controller to

continuously adjust charge voltage / charge current based on actual battery temperature.

When the battery temperature is over 40°C, unit will reduce the charging voltage to Float voltage, also it will reduce the Max charging current by 10% with every two degree of temperature rise.

When the battery temperature is over 50°C, unit will shut down.



Operation temperature

Nominal ambient temperature: 25°C

Operating Ambient Temperature range: -10°C to 40°C

(On the heat sink of DC-DC part, if the temperature is over 90 the Charger Current will be de-rate to 50% ; if the temperature is over 105F the Unit will be shut down.)

Relative humidity

5-95% without condensation


Unit requirements: below 50dB (A) measured at 1 m distance with fan full working.

Storage Conditions Temperature

-20°C to +80°C


Smart fan control



Dimensions (L x W x H)

10.25 x 6.75 x 3.25 inches

Unit Weight

6.5 lb

Boxed Weight

7 lb

Product Documents


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