STEVAL-ISV020V1 - Absolute value for input voltage

[GAbi .1]

Hi,

In the evaluation board of SPV1050 (STEVAL-ISV020V1), it is mentionned that the maximum voltage from the PV cell (VMP) is to be equal 9V, but there is no indication about the absolute values that I can be supported without damaging the board.

I'm working with a PV cell having an open circuit voltage of 9.6V with a voltage at the maximum power point of 9.2V.

Would you think under these conditions, the evaluation board will be damaged ?

Thank you for your reply.

Georgina

[Peter BENSCH]

No, it doesn't get damaged.

The databrief of the STEVAL-ISV020V1 mentiones at the first page under features:

• Input voltage working range: 150mV =< Vin =< 18V

In addition you can find in the datasheet of the SPV1050 for IN_HV the absolute max rating of 20V.

The 9V you mentioned was probably that statement from the databrief of the STEVAL-ISV020V1:

The STEVAL-ISV020V1 board is optimized to:

• Harvest energy from PV panels supplying 2.6V =< VMP =< 9V and 10µA =< IMP =<20mA
• Charge a battery with the 3.7 V undervoltage protection threshold (VUVP) and 4.2 V end of charge voltage threshold (VEOC).

When your question is answered, please close this topic by choosing Select as Best.

/Peter

[GAbi .1]

Thank you Peter for your answer.

And yes I meant the part where the STEVAL-IS020V1 board is optimized to:

• Harvest energy from PV panels supplying 2.6V =< VMP =< 9V

Since I'm not going to change anything in the board for the first step (resistors or capacitor) so I am not going to extend the features of the charge controller to 18V maximum input.

Shouldn't I just follow the limitation of the board ? if it is mentioned maximum of 9V, I was wondering if 9.5V would damage it.

Thank you so much for your patience and help.

Georgina

[Peter BENSCH · Accepted solution]

Don't worry, the 9.5V is just 500mV outside the recommended range for which the MPPT is optimized.

/Peter