we are working on an experimental weather station based on seeeduino stalker v2.3 and Seeed Studio GPRS Shield v 1.4.
Since the station should be compact and energy-efficient we powered the system with a very high capacity LiPo 3.7v connected to the stalker power ragulator and a 1W solar panel.
When the GPRS try to connect (absorbing the stated short 2A peak current) it turns off.
We tried with a 220microF capacitor between GRD and +5V, GRD and +3.3V, and also between the GRD and VBAT pins following the indication of power supply for the Evola GPRS
The GPRS only works if we provide an external 5V power supply.
Is there a way to power it up with just the LiPO?
Thanks in advance for any suggestion, we are at a dead point!!
Jacopo & Alessandro