Why you need a solar controller

When you use a solar panel, and want to transfer the solar energy store to the battery or use it to charge your mobile, or lunch a lamp.

Then you may need a solar charge controller to transfer the energy , and protect the battery will not over charge to damage.

First, you many need to check the battery voltage, norV mally, the battery voltage is 12V/24V. this is the safe voltage for human. but now. the 36V 48V and 60V, even 72V battery , they with more efficient usage. and also , the battery voltage should math with the solar panel voltage.

12V Float	14.2V (defaul, adjustable) 12.0—15.0
12V Discharge Stop	10.7V (defaul, adjustable) 9.0—11.5V
12V Discharge Reconnect	12.5V (defaul, adjustable)  11.0—13.0V
24V Float	28.4V (defaul, adjustable) 24.0—29.0V
24V Discharge Stop	19.0V (defaul, adjustable) 18.0—22.0V
24V Discharge Reconnect	22.0V (defaul, adjustable) 22.0—26.0V
36V Float	42.0V (defaul, adjustable) 36.0—45.0V
36V Discharge Stop	30.0V (defaul, adjustable) 27.0—33.0V
36V Discharge Reconnect	38.0V (defaul, adjustable) 36.0—42.0V
48V Float	56.0V (defaul, adjustable) 48.0—60.0V
48V Discharge Stop	40.0V (defaul, adjustable) 36.0—44.0V
48V Discharge Reconnect	50.0V (defaul, adjustable) 48.0—56.0V
60V Float	71.0V (defaul, adjustable) 60.0—75.0V
60V Discharge Stop	50.0V (defaul, adjustable) 45.0—55.0V
60V Discharge Reconnect	63.0V (defaul, adjustable) 60.0—70.0V
Self-Consume	<10mA
USB Output	5V/2A Max
Operating Temperature	-35-+60℃
Siez/Weight	170*92*45/450g

Solar Panel

When the solar panel made, it will marked some parameters as follow:

Electrical Date			Mechanical Data
Maximun Power at STC	90W		Solar Cell Type	Monoctrystalline(125x125mm)
Optimum Operating Voltage (Vmp)	16.0V		Number of Cells	32(4×8)
Optimum Operating Current (Imp)	5.6A		Dimensions	1050x535x2.8mm
Open Circuit Current (Voc)	19.2V		Weight	1.88kg
Short Circuit Current (Isc)	6.16A		Application Class	Class A
Module Efficiency	18.3%		Frame	None
Maximum System Voltage	700VDC (IEC)		Connectors	MC4 Connectors
Maximum Series Fuse Rating	10A		Fire Rating	Class C

Thermal Characteristics				MC4 Connectors
Operating Module Temperature		-40℃to+85℃		Rated Current	30A
Norminal Operating Cell Temperature (NOCT)		45±2℃		Maximum Voltage	700VDC
Temperature Coefficient of Pmax		-0.42%/℃		Maximum AWG Size Range	10AWG
Temperature Coefficient of Voc		-0.31%/℃		Temperature Range	-40°F to194°F
Temperature Coefficient of Isc		0.05%/℃		IP Rating	IP67

Junction Box
IP Grade.			IP 67
Number of Diodes			1 Diodes.
Output Cables.			10 AWG (2.95ft long)

This is the description of the 90W flexible solar panel.

And when you choose the solar panel, and the battery, you may need to pay attention to the description. to make sure their math with each other.