DIY solar power bank 5V 230Wh

Daox · 08-24-19, 12:05 PM

I got my dc-dc converters last night. So, I printed up a little bracket for them. It went quick and easy and they fit great.

I started tinkering with them this morning. I started by connecting the dc-dc converters up to the battery bank with alligator clips. I then set the open circuit output voltage to 5V for the USB.

I was delightfully surprised that the dc-dc converter power draw with no load is a very low ~.35 mA. This will eliminate the need to switch them off and keep things simpler. It will loose .014 Ah per day with the two dc-dc converters hooked up. I think this is acceptable.

I also hooked up an old phone to the circuit. As expected, it started charging at about 5W.

However, when I plugged my newer phone into the charger it also charged at only 5W. I specifically got dc-dc converters that can handle more power output so I can charge at faster rates. So, I need to figure out what is required to activate the faster charging. If you guys have any info on this it would be much appreciated.

08-24-19, 12:05 PM	#31
Daox Administrator Join Date: Aug 2008 Location: Germantown, WI Posts: 5,525 Thanks: 1,162 Thanked 374 Times in 305 Posts	I got my dc-dc converters last night. So, I printed up a little bracket for them. It went quick and easy and they fit great. I started tinkering with them this morning. I started by connecting the dc-dc converters up to the battery bank with alligator clips. I then set the open circuit output voltage to 5V for the USB. I was delightfully surprised that the dc-dc converter power draw with no load is a very low ~.35 mA. This will eliminate the need to switch them off and keep things simpler. It will loose .014 Ah per day with the two dc-dc converters hooked up. I think this is acceptable. I also hooked up an old phone to the circuit. As expected, it started charging at about 5W. However, when I plugged my newer phone into the charger it also charged at only 5W. I specifically got dc-dc converters that can handle more power output so I can charge at faster rates. So, I need to figure out what is required to activate the faster charging. If you guys have any info on this it would be much appreciated. Attached Thumbnails __________________ Current project - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. & To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.