I have a small project to make a solar charging system for my 3S Li-Po battery (2500mAh). I bought the Genasun GV-5 lithium MPPT for this. However, when I connect the MPPT to the solar panel and the battery, I realized the Li-Po battery is not charging. Is there any problem with the connection? Thank you.
yes
Is the power supplied I used not enough to charge the battery ?
how much power is supplied?
Could be, or the charger might be faulty.
I set my power supply to be 4V and 0.5A
But the MPPT is brand new and the indication light on it shows me it's now "standby" when I connect the battery to it.
it should be enough.
but i see on picture 2S Li-Po
if your battery is discharged under 7.2V it is under minimum requiring
Why are you charging a 2S LiPo with a 3S charger, the battery will likely explode !!!!!
no. at least on CC curve
Oh no. Pls Ignore the 2S battery 
The charge and battery operations of a MPTT or a PWM Charge controller are built around operating a lead acid battery or a LiFePo4 battery. A Li battery does not meet the same charge discharge curves as a lead acid or LiFePo4.
So does it mean that the MPPT can't be used to charge the LI-Po battery?
Q: Does your Li battery have the same charger discharge characteristics of a lead acid or LiFePo4 battery?
(pick one)
A: No
B: see A
on picture in post #13 is 3s li-Po battery.
charger is for 3S li-Ion, also near to similar CC-CV charge process.
but if battery is full why should it be charged, the system goes standby
Is this solar battery charge a laptop? If this battery charge the laptop this is a very fine invention you create great work keep it up.
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