Hi all.
Following a project - AllSky - taking photos all night at the sky - I want to place the PI - Raspberry PI 4 B+ 4GB memory using a SSD NVMe 512GB - where I don't have a power outlet.
I've the following setup:
- Solar Panel -
- max power: 20W
- Vmpp: 18.2V
- Voc: 22.6V
- Impp: 1.12A
- short-circuit: 1.18A
That connects to a Waveshare Solar Power Manager (C), that is powered by 3x 18650 batteries - each battery has 3350mAh - NCR18650B.
I've set the setup voltage switch for 12V - the same as the solar panel.
I don't have a problem with the charging. It charges very well, to full charge.
My problem is, it just wont last all night.
Starting to take pictures at 21:30 (9pm), it only lasts to (the last picture taken) 3:44 (3:44am) . Just over 6h.. This can't be right.
My question is - what can I do to make it last longer. Should I buy more powerful batteries - like 5000mAh or more ? Chose other solar charger ?
I have the Raspberry PI Lite version - and I've disabled some unwanted services like - bluetooth, avahi-daemon, triggerhappy, etc.. I even disabled the status LEDS... 
Any idea would be great.
Thank you
