Sterling Power Products
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Miscellaneous information
Battery temperature sensing:
Simply connect one of the enclosed temperature sensors
to a battery terminal post (negative or positive) and to the
2x small terminals marked battery temperature. There is
no polarity on these wires. The output voltage will be
reduced in accordance with manufacturer’s battery
charging temperature curves and, in the event, of the
battery temperature increasing due to battery failure. If it
exceeds 60 deg C, which is a major problem, the unit will
switch off the charging.
There is a power / temperature reduction algorithm which
will reduce the units output if the temperature rises to:
Battery Temperature: 65 degC
Charger Temperature: 90 degC
Start up and test procedure (x2 for 24V)
When the unit is first connected, it will run the start up
procedure as long as the battery is above about 6V. After
the start up procedure (if the input voltage is still low) the
unit goes onto sleep mode (all lights off). The unit will
remain in sleep until the input voltage exceeds 13.3V ( x 2
for 24V) this then activates the unit.
On normal operation:
when input voltage over 13.3V (x 2
for 24V).
The blue LED will light up showing constant current
charging, then after 1-8 hours (depending on state of
batteries etc. The blue and yellow indicating absorption
time 1 then yellow indicating absorption time 2, then green
for float (battery charged).
If on start up nothing happens:
Test the battery voltage. It should be above 13.3V, to see
the unit working start up the engine and ensure you are
getting at least 13.5V at the battery. If you are getting at
least 13.3V (at the unit) and there is nothing working then
the unit is defective. If you are not getting 13.3V then the
fault is on you power supply.
Fan replacement.
The main electrical box is IP68 i.e. it can be totally
submerged in water. However, the fan is IP55 which
cannot, so, in the event of the fan being destroyed simply
replace it. These small 40 mm fans are easily found and
are low cost to replace. Simply fit the correct DC voltage (
marked on the fan fitted ) and replace the unit.
What is regenerative braking?
Regenerative braking fix ( function 1+ 3 )
A new, very serious, issue for auxiliary charging systems
has now been introduced in a lot of vehicles and small
vans, it is called
It is a great idea as
regenerative braking.
far as the primary vehicle is concerned as it adds extra
MPG to the vehicle’s specification. However, it is an
unmitigated disaster as far as the auxiliary battery
charging system is concerned.
In order to increase efficiency of vehicle’s fuel
consumption, on vehicle’s start up, the idea is to only
charge the battery with enough power to safely restart
the engine. Once this has been achieved after a few
minutes then the alternator drops its voltage from
about 14.8V to about 12.6V leaving "space" in the
battery. The idea is that, at 12.6V, the alternator has
sufficient voltage to power the engine systems without
accessing the battery power, yet, not enough voltage
to charge the battery fully.
When the brakes are applied on the vehicle the
alternator’s voltage ramps up quickly to boost large
amounts of power into the space left in the battery.
This loads up the alternator which helps out the
vehicle’s braking and adds a spurt of power to the
batteries. Once the braking is removed then the
voltage drops again and that "free" power boosted into
the batteries is then used by the vehicle. Once it has
used up the 12.6V the alternator simply takes over.
This is great for the primary vehicle and does what it
says it does but means the auxiliary battery system
simply cannot get effectively charged.
The solution
is our new Battery to Battery charger. As
mentioned, it has both an auto setting and an ignition
setting. If you have a regenerative braking system
simply select the ignition setting and, even when the
vehicles electrics drops to 12.6V ( or lower ), we simply
take that voltage and boost it up into your auxiliary
battery system ensuring steady power charging
regardless of the vehicle’s voltage variations.
Page 8
battery temp
sensor
Temperature sensor
Not obligatory to connect.
If you wish to install, connect the temp sensor to the
negative of the domestic / aux. batteries.
When temp sensor senses the temperature lower
than 20Deg C the voltage shall go up on the charger’s
output and when the temperature is higher than
20Deg C the voltage.
Sensor shall trip the charger if the temperature of
battery >55DegC.
