User manual MPPT Solar charge controller PowerXtreme XS20
E18-XS20-EN00
www.emergoplus.com
Page 8 of 44
1.4 Introduction of charging phases
The MPPT charger makes use of a 3-step charging curve for the charging
of the battery. A full charging process includes:
A] consistent current charging
B] consistent voltage charging and
C] floating charging.
The charging curve as shown below:
Image 3. Relation between solar panel output and light intensity
光照降低，电流减小
光照降低，开路电压减小
U(V)
I(A)
Current will decrease in case of an increase in
dusk
Current will decrease in case of
an increase in dusk
