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Pros and cons of 12V, 24V, 48V system. - Page 3

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Posted by wmbjkREMOVE on August 15, 2008, 8:05 pm
On Fri, 15 Aug 2008 06:16:15 GMT, "Bruce Harvey"

No, it's "yes" only.  :-)

Just to be clear, the controller switches out of MPPT mode once it
enters absorption stage. When absorption is finished, the voltage is
lowered to float.


Posted by Bruce Harvey on August 17, 2008, 1:06 am

Yes Wayne, sorry, my bad. The charge controller on the MX-60 changes the
current (Amps) to cause the output voltage across the batteries to change so
as to reduce the output power to a point where it only maintains constant
voltage across the batteries (Float). This output voltage can of course at
no time exceed the input voltage from the panels and is only lowered by the
load created by the batteries. My apologies for the poorly worded


Posted by Ron Rosenfeld on August 14, 2008, 2:09 pm
 On Wed, 13 Aug 2008 13:44:57 -0700 (PDT), Crappy

I'm heading out of town for a few days so can't respond in depth to your
questions.  But here's a link to a controller similar to what I use:


And the panel voltage does need to be above the battery voltage in order to
get any charging.  Voltage does climb rapidly, however.  See PV mfg
detailed specifications for more info.

The minimum voltage for you array should be above the equalization voltage
for your batteries, which may be, for a nominal 24V system, as much as 32V.
A panel marketed for a 24V system will usually put out more than that at
it's maximum power point.  Probably it will be in the range of 34-35V.

I have no idea about or experience with the Ebay regulators.  But you
generally get what you pay for.  Because of the higher voltage of my array
compared with the batteries, I did not consider anything other than the
MX60.  Also, you should be able to harvest more power from the array with a
MPPT type controller.  I doubt the Ebay controllers do that.  (Something
more for you to read up about <g>).

Good luck.

Posted by Eeyore on August 16, 2008, 12:22 am

Crappy wrote:

You do know about wiring regs I hope  ?


Posted by Eeyore on August 16, 2008, 12:21 am

Crappy wrote:

Spend the money on more insulation and other energy SAVING measures
instead. You are using all CFLs for example I assume ?

You'll do FAR better that way.


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