Hi Dan,
Just a quick comment about ganging several batteries together. To increase the
number of batteries to gain more run time, use a DC-DC buck converter. On
Amazon they sell in the $5 to $10 range. They can take an input voltage up to
35v input and regulate it down to whatever voltage you set the regulator to.
Since it is a Buck converter using a switching mode, they are much more
efficient then a linear regulator.
The DC to DC converters I am talking about can handle 3 amps of current
through them. I use these converters to power a Raspi at 5volts directly from
ganging several 12 volt lead acid batteries in parallel and end up with about
over two weeks of continuous 24 X 7 recording on to a 32GB SD card.
Another solution is to have combination of series and parallel batteries that
have the ability to keep the voltage under 18 volts but have two or more
strings in parallel together to increase total available power.
Teratech
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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