Monday, July 24, 2017

How to solar charge Li-Ion batteries

So, I bought two Li-Ion batteries for the field. They are definitively smaller and much lighter. I used them last night for my scopes. Everything worked great. Then I charged them with me 100W solar panels during the (very sunny) day. In the evening I tried to use them again, but both gave up very quickly.

Did some research and found out that they need special charge controllers as their charge profile is different. After lots of research I bought new charge controller from Morningstar. In about a week will I find out if and how much of a difference that makes...

Wednesday, July 12, 2017

Mauna Kea Observatories

My personal highlight of our Hawaii vacation was a summit tour of Manua Kea to watch the sunset. Initially, I had SO many ideas for photos and videos to take. But I ended up taking a few and then setting the camera into auto mode to take images for a sunset timelapse ...
... and then just taking it all in!!!

First, the timelapse:


And then some of the amazing photos that can't capture the moment.
The Subaru telescope (left) and Keck I and Keck II.

My friend Patrick in front of UH88

The CHFT

Taking Photos

Me and Patrick
Star gazing under the Milky Way on our way back down