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in the case that you will be loading the input power source considerably (so the voltage will drop more
significantly under load even though there is still sufficient capacity remaining in the 12V battery for
example) you can set this as low as 10.0V. However, keep in mind that dropping the voltage under
load to as a low as 10.0V (or even 10.5V under some loads) could result in discharging a 12V battery
input power source low enough that it will not start the car when needed.
Input Power Source Connection
The input power leads for the charger are equipped with 4mm bullet connectors compatible with most
typical female ‘banana plug’ receptacles. You can connect these directly to the outputs of many AC to
DC power supplies, or you can also connect them to the included alligator clips for more convenient
connection to Pb/lead-acid batteries. However, especially when charging at or near maximum
input/output power levels, you must ensure the bullet connectors/alligator clips are making excellent
contact with the power source in order to minimize resistance and prevent voltage/power
loss/damage.
After connecting the charger to the input power source with proper polarity the charger will power on
accordingly. At this point you will briefly see the ‘Welcome’ screen indicating the charger model and
the version of firmware currently installed in the charger.
Please also note that in some cases if the connection to the input power source is not ‘clean’
the welcome screen may not show and instead only part of the default Charge Mode screen
will show. This will typically happen when connecting the charger to a power source that is
already ‘on’ so we suggest powering down the source before connecting the charger. Also, if
this occurs simply disconnect the charger from the power source, then re-connect ensuring
that you achieve a solid/clean connection during the process.
INPUT AND OUTPUT POWER
The charger will automatically adjust the output power level available based on the input voltage,
current, output voltage, etc. and at no time can the input current exceed 40.0A max. As a result you
can obtain higher/maximum output power when using higher voltage power sources that provide 24.0-
28.0V. However, it is still possible to obtain relatively high levels of output power using more common
10.5-15.0V power sources.
Here also is a quick way to help determine the approximate amount of input power your chosen power
source can supply:
Input Voltage (under load) (V) x Input Current (A) = Input Power (W)
For example:
12V x 25A = 300W
12V x 40A = 480W
24V x 25A = 600W
27V x 40A = 1080W
The input power level will dictate the charger’s output power level capability in total based on charger
efficiency (typically ~85-93% depending on input/output voltage). And in turn the output power level
capability will dictate the maximum charge current/voltage capability accordingly.
Please see the chart provided separately for a quick reference of the maximum output power
levels/charge current for LiPo batteries based on the listed input voltage and current (and please note
that these values are approximate and may vary +/– slightly depending on input voltage of the power
