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The SunSaver Duo is an advanced, fully automatic solar battery charger. No
adjustments are required except to select the battery type at installation. Each battery is
charged independently. The SunSaver Duo has a 4-stage charging algorithm as shown
Charging Information
in figure 7.
NIGHT
Figure 7. SunSaver Duo charging algorithm
Figure 7. SunSaver Duo charging algorithm
1. Bulk Charge – Recharging with 100% of available solar energy.
1. Bulk Charge – Recharging with 100% of available solar energy.
2. Absorption – PWM constant-voltage regulation to prevent heating
2. Absorption – PWM constant-voltage regulation to prevent heating and
and excessive battery gassing. Pulse charging to restore full battery
excessive battery gassing. Pulse charging to restore full battery capacity.
capacity.
3. Float – After battery is fully charged, SunSaver Duo reduces to a float
3. Float – After battery is fully charged, SunSaver Duo reduces to a float or "trickle
or "trickle charge".
charge".
4. Boost (Flooded battery type only – Every 28 days) – A boost charge
4. Boost (Flooded battery type only – Every 28 days) – A boost charge for flooded
for flooded batteries, bringing uneven cell voltages into balance and
batteries, bringing uneven cell voltages into balance and extending battery life.
extending battery life. Sometimes called an equalization charge.
Sometimes called an equalization charge.
NOTE: A 15V maximum battery voltage limit prevents
NOTE: A 15V maximum battery voltage limit prevents damage to sensitive DC loads.
damage to sensitive DC loads.
Protections
Over-current – Solar charge current exceeds the current rating of the
SunSaver Duo. Automatically reconnects in 30 seconds.
CAUTION: A mis-wired connection of a battery to the Solar
input when a second battery is already connected to a
Battery input may damage the SunSaver Duo.
High Temperature – The heatsink temperature is above safe limits.
Automatically reconnects when heatsink cools to a safe temperature.
Short Circuit – Solar input power wires are short-circuited. Charging
automatically resumes when the error is cleared.
Battery Reverse Polarity – Battery 1 or Battery 2 power connections
are connected backwards. Error clears when the mis-wire is corrected.
1
2
BULK
ABSORPTION
CHARGE
TIME
19
15
4
BOOST
3
FLOAT
NIGHT
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