How to choose a HI-FI stereo system

Input – Solar Panel :
Cell Type – Monocrystalline
No. of cells – 32
Open circuit voltage – 22.9 V+/-10%
Short circuit current 1.59A+/-10%
Voltage at Maximum power 19.25V +/- 10%
Current at Maximumpower 1.56A+/- 10%
Maximum Power 30 W
Nominal Operating Cell Temperature : 45 °C ± 2 °C
Panel operating Temperatures -20 °C to +65 °C
Superstrate High transmission lowiron AR Coated tempered glass
Dimentions : 510mm x 425mm x 17mm

Battery :
Charge current Up to 1.5 A (Depends on Solar irradiation and Battery SOC)
Capacity : 76.8Wh
Nominal Voltage 12.8V
Working Temperature 0°C~60°C (Discharge), 0°C~45°C (Charge)

Features :
Weight 590 (+/- 15)g
Dimensions 70 mm x 130 mm x 35 mm (±10) mm
Cycle Life 1000 @ 90% DOD

Output – To Load
Voltage During Charging : 12V (+/-10%) will be adjusted slightly based on Cable Length

Voltage During Discharging 12V(+/- 10%),Willbe adjusted slightlybasedonCablelength
MaximumLoad Current During Charging: 1A
MaximumLoad Current During Dis Charging: 1A
Cable Length 3 Mtr.

Charge and Backup Time Analysis :
Load 12 Watt Camera load (Load varies from 2.65 Watt to 10 Watt)
Full charge time 6 to 7 Hours at 90% Irradiation (Depends on Solar irradiation and (Load Conditions)Backup time
Backup time : 12 Hours (Assumption based on 76.8Wh Battery Capacity and 5.5 Watt continuous load)
Battery backup may vary based on the change in Power consumption

Indications :
LED : 1.Battery charging: Green Blink
2.Full charge: Green ON
3.Battery discharge: Red ON

Overall device level Features and Protections :
1.Over voltage
2.Transient protection on input side
3.Higher efficiency and less self heat generation
4.Over current protection
5.Short circuit protection

Primary Safety features and Protections for Battery pack :
Using a separate PCB inside the battery pack to protect from all kinds of faults and issues mentioned below.
1.Over current and Short circuit protection
2.Over voltage protection
3.Under voltage protection
4.Over charge protection
5.Deep discharge protection