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Charge a small battery from a large one, or from an automobile,
truck, tractor or back-hoe. This DC converter automatically converts any
voltage from 8V to 16V to 13.8V for battery charging. It has a active current
limit of 8 amps. It also features total isolation so the input ground is
galvanically isolated from the output ground. This could be used for charging
negative grounded batteries in a postitive ground car, and vice
versa. |
Inexpensive fully isolated taper style controlled lead acid
battery charger voltage charger with 8 VDC to 16 VDC input. Used to charge 12
volt lead acid batteries when only DC voltage is available. It cannot
overcharge the battery. |
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For 24V to 12V,
12V to 24V, 24V to 24V DC-input chargers click here
| Model Number |
PST-PB1108
DCDC Charger |
| Input Voltage Range |
8 VDC to 16 VDC |
| Battery Voltage (nominal) |
12 Volts |
| Continuous Charging Current |
8 Amps |
| Charging Algorithm |
Constant current-Constant
voltage (CC-CV) |
| Battery Size |
8 AH to 100+ AH |
| Protections |
Over temperature
protection
Output short circuit protection
Low input voltage
protection
Battery polarity protection on the output
NOT polarity
protected on input
Ignition noise and load dump protection |
| Isolation |
Full galvanic isolation means
that both the plus and minus outputs are isolated from the input. This allows
two of the PST-PB1108 to be used to charge in parallel (to decrease charge
time) or series (to charge two 12 volt batteries in a 24 volt configuration)
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| Output stability |
Ripple & Noise <25mV
RMS
Output regulation with varying input 8-16V -- <20mV |
| Efficiency |
>87% |
| Dimensions |
100 x 115 x 70 mm
4 x 4.5 x
2.75 inches
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| LED indicator |
Green-Power on
Yellow--Input
voltage too low
Red--Output overload
(there is no "battery charged"
indicator) |
| Connection |
Input: 28 inch wires with 6.5mm
inside diameter ring terminals
Output: screw terminal block with M3
screws |
| Operating Temperature |
-20-50°C |
| Remote Turn-on |
When +12V is applied to the
brown wire of the input harness the unit will turn on if the rocker switch is
turned off. |
| Weight |
750g, 1.7 pounds |
| Cooling |
Passively cooled, no fan |
The following table describes the display of LED lights at
different stages of charging:
Q: Can I leave the battery continuously on
the charger?
A: Yes, the charger will go into "maintenance mode" and
keep the battery topped off.
Q: Can I draw power from the battery when
the charger is connected?
A: Yes, the output is fully isolated from the
input, so there is no danger in confusing grounds.
Q: If I discharge the
battery while the charger is attached will the charger maintain a full
charge?
A: Yes, When the charger detects that the battery voltage has
dropped it knows that the battery needs to be charged and goes into "constant
current" mode again automatically.
Q: Can the charger be left connected
to the battery when the charger is not turned on, or when the input voltage of
the charger has been cut off?
A: Yes.
Q: Can I charge my 12 volt
golf caddy from my car?
Yes, the charge time should be less than 2 hours
for a fully depleted golf trolley.
Advantages:
Inexpensive DC input charger.
Protects even small 12 volt batteries from gassing or damage.
Applications:
Charging wheel chairs, bicycles, golf trollys and scooters in a car, van or
bus.
Fully automatic without intervention.
Output short circuit and battery polarity protections.
Charging 12 volt sealed lead acid batteries from a vehicle.
Charging 12 volt "jump start" batteries from a 12 volt tow truck or service
vehicle.
Charging 12 volt electric bicycle from a vehicle.
Two
stage charge--constant current, constant voltage. T
Installation
Notes:
- A qualified automotive electrical technician should be used
to wire the charger into the vehicle.
- The PST-PB1108 converts 12 volt power into 13.8 volt power
for charging, so for an 8 amp output the input needs over 9 amps. Make sure
that the wires connecting the PST-PB1108 are adequate for the current and the
length of the run. If the voltage drop in the wires are too much the "Low
Battery Voltage" alarm will come on. Wires that are too small may also overheat
and melt the insulation, causing a dangerous situation. 12 gauge is usually
adequate for runs up to 20 feet of wire (adding together the positive and
negative wire lengths).
- It is OK to leave the unit on the charger when the power to
the charger goes on and off.
- Mount the PST-PB1108 in an area that will get adequate
ventilation and will be free from rain, spray, or excessive dust.
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