samlexsolar SC-05, Owner'S Manual

Page: 12 / 20

12 | SAMLEX AMERICA INC.
SECTION 5 | Installation & Operation
5.2 CHARGING BATTERY FROM SOLAR PANEL DIRECTLY (WITHOUT
USING CHARGE CONTROLLER)
Refer to the previous Section 3.2.4. SunChargers SC-05 and SC-10 are designed to float
charge a “fully charged” 12V Lead Acid Battery under long term storage to compensate for
self-discharge and thus, prevent sulfation due to under charging. For float charging Lead
Acid Battery directly from a solar panel (Charge Controller is not used between the panel and
the battery), the following considerations will be applicable:
a) A 3-Stage Charger should first be used to fully recharge the battery to be kept in
long term storage. The battery will be fully recharged when the 3-Stage Charger
enters Float Stage after completion of Bulk and Absorption Stages. Float Voltage of
12V Lead Acid Battery is normally 13.5 to 13.8VDC at 80°F / 26.7°C (Absorption and
Float Voltages will require temperature compensation based on Voltage Temperature
Coefficient of the battery which is around -24mV/°C for 12V battery). When in Float
Stage, the battery will draw a very low current equal to around 0.1% of its Ampere
Hour (Ah) Capacity at 80°F / 26.7°C to compensate for self-discharge (Self discharge
increases with increase in battery temperature).
b) The Float Voltage of 12V battery at 80°F / 26.7°C should not exceed 13.4 to 13.8V.
Higher Float Voltage will cause over-charging leading to boiling / over-heating /loss of
water / damage to the battery
c) After the battery has been fully recharged, direct Solar Trickle Charger like SunCharger
SC-05 / SC-10 should be used based on the following I-V Characteristics of the panel
(Fig 4.1):
i. The I-V Curve characteristics should be such that the panel voltage corresponding
to the Float Stage Current of the battery (0.1% of Ah capacity of the battery at
80°F / 26.7°C) should be within the range of 13.5 to 13.8 VDC to prevent over-
charging as described at (i) above.
ii. The I-V Curve Characteristic should be such that for panel voltage of 13.4 to
13.8V, the panel current should be around 0.1% of its Ampere Hour (Ah)
Capacity of the battery at 80°F / 26.7°C to compensate for self-discharge.
i
INFO
1. Specifications of the panel given in Section 6 are based on the Standard Test
Condition (STC). The overall performance of the Solar Panel is dependent on a
variety of conditions including season, orientation with direct sunlight, cloudy
conditions, temperature, and shadowing. As a result, specified performance
parameters will be affected by the above operating condition.
2. For safety against excessively high short circuit current flow from the battery to a
short circuit in the cabling / panel itself, the following fuses have been provided:
•
10A Fuse in the tip of the 12V Accessory Plug provided with the SAE to 12V
Accessory Plug Adapter Cable Set (Fig 2.3)
• 10A Fuse provided with SAE to Ring Terminal Adapter Cable Set (Fig 2.4)