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Battery question: Can this be done? - Page 3

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Posted by Jim on August 19, 2010, 1:19 am

On Tue, 17 Aug 2010 13:30:02 +0000, Roberto Deboni


That's the way it is hooked up now, I guess I wasn't too clear
in the description.

Posted by Roberto Deboni on August 19, 2010, 9:31 am

Jim wrote:


Sorry, I overlooked.

Anyway, why do you want to change the configuration ?


Posted by Jim Wilkins on August 19, 2010, 12:00 pm

I don't. Isn't the negative side of the panel and Morningstar on the
higher battery at +12V?


Posted by Jim on August 19, 2010, 10:39 pm

On Thu, 19 Aug 2010 09:31:13 +0000, Roberto Deboni

Well, this was just a thought and why I originally asked the question.

I was going to use the two 12v panels to charge the deep cycle 12v
batteries, then use the 24 volts with small grid tie inverter to pump
the AC into the house grid.  After watching the various setups on YOU
TUBE, unless you have large panels that can supply the full power to
the grid tie inverter, the efficiency drops way off and they don't
put out much AC.  However, I saw one fellow who ran his Grid Tie from
battery bank and he got MAX and even over max from the inverter.
You could charge the batteries during day and dump the AC at night.
Just a thought.  

To go Grid Tie with large solar panels, say 200 watts and the Enphase
inverter on each panel, you are talking serious money, in the vicinity
of $000 or more for each panel, just for 190 watts of AC.  Well, for
that kind of money it's just not cost effective at this time here, but
I'm saving my money to   ALthough you can get large panels in the $50
range, the shipping on them adds several hunred dollars more, judging
from the quotes I have received.

There are now some little inverters that supposedly work down to 10.5
VDC, but I don't know how much power they put out at say 12 VDC from
a battery bank.  THey seem to work better in the 24 vdc range, or at
least 17 or 18 vdc range.

I guess I could charge the 12v batteries in parallel, then switch them
to series (+24) at night to pump the AC into the grid.  The batteries
would drain pretty fast at those discharge rates.

I also need 12v to power the emergency lights and my ham radio station
during hurricanes and power outages.  We had one just two weeks ago,
one of the breakers tripped on the transformer feeding our area,
and we were without power for several hours.  I cranked up the
generator to keep the fridges going, some fans and lights, radio gear
was on 12v battery, all worked fine.  As it was evening, the
temperature was just bearable but over 85 and very high humidity.
My 3 kw gen will handle one small window unit so we would all have
to move into one small room to keep comfortable... .he he.. Gen
runs on Natural Gas and it started right up, Honda.

If anyone on here has any experience with those small Chinese Grid Tie
inverters please jump in and enlighten us.  From what I saw on
YOU TUBE, many of them are junk and only last a few weeks, whereas
some who look identical to the bad ones seem to work fine for many
months.  I notice that none of the Solar dealers who supply panels and
the expensive inverers sell the cheap Chinese grid tie inverters,
probably bad for business if they are not reliable or not enough
profit involved.....


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