Evening Nina,
1) What is the advantage to using many 9 volt batteries in a row, as opposed
to one?
I use my old ( 3 X 9 ) unit from time to time. When I use it, I
series two each small 12 volt batteries with it. That is 27 + 24
volts. 51 volts is virtually the same voltage I get when I use my phone
line generator.
Seems I keep giving away my phone generator to family and friends. One
relative told me on thanksgiving day they wanted 4 of the units. They are
a pain to build and I don't want to build any more.
2) Also, is one 12 volt battery okay to use instead of a 9 volt?
I have dozens of batteries sitting around. I have used up to 75 VDC
by connecting an array of batteries.
Likely one could go up to 200 VDC with the right setup.
One should learn what batteries are available on the market. The
main advantage I see for batteries is that of remote use when no ac is
available. For example, camping, hunting, hiking, or.... you name it.
The automobile battery, plus a few small 12 volt batteries would work
just fine.
Solar chargers are very economical now.
Batteries drive me crazy ! I am deaf and have to have 3 AA batteries
to hear. I have a basket full of them and am constantly charging
batteries. I usually have either 3 or 6 in my pocket at any time.
Typically, I use 3 sets per day.
Seriously, I have thought of getting a solar charger and wearing it on
my head or my back.
In addition to the rechargeable ones, I keep a dozen or two alkaline AA
in my truck. Only about once every six months do I get caught without
rechargeable and have to use these.
I would advise you or anyone to select a voltage you want to use and
develop the instinct to go along with it. This way, everything you learn
and observe would be consistent.
Honestly, the phone line generator seems to be my choice when conditions
prevail to use it.
I need to build about 20 of them now. Maybe I can pick up the parts today.
Wayne
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