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Larry,<br>
Nobody has responded to your question: "How can this possibly be OK
for the 75AH battery? And why would a battery manufacturer say
this?" and like you, it goes against everything that I have assumed.
But to answer that first question: when I look at, I wonder why it
wouldn't work. With AGM batteries you can tolerate both high and low
charging C/ rates and long absorption times. So it makes sense that
as long as the voltage remains the limiting factor and the array is
large enough to allow routine long absorption periods, it oughtta
work just fine. <br>
<br>
Your thoughts?<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com"><a class="moz-txt-link-abbreviated" href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span style="mso-bidi-font-weight:bold">Positive
Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
style="mso-special-character:line-break">
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<div class="moz-cite-prefix">On 11/18/2015 5:09 PM, Starlight Solar
Power Systems wrote:<br>
</div>
<blockquote
cite="mid:FE9D0583-7ADC-42B5-85D2-CDC9BC572C2F@starlightsolar.com"
type="cite">
<pre wrap="">Just when I thought I was becoming a battery guru, this came up: A customer asked me if he could purchase two different size 12 volt Lifeline (Concorde) AGM batteries and connect them in parallel. Of course I told him this was a bad idea and all his parallel batteries should be same make, age, size. A few days later he called me back and said he talked to Lifeline battery and they told him it was fine to mix any size of their batteries together. Knowing that people sometimes hear wrong, I called Lifeline to inquire. The answer, "yes, you can mix any of our batteries in parallel. We have tested that and Concorde tested it and it’s no problem”.
Stunned, I asked him if this was in writing anywhere and he said no but I could test this myself. So battery wrenches, what will happen if I have an 8D at 255AH paralleled to a group 24 at 75 AH and discharge this to 80% DoD? How can this possibly be OK for the 75AH battery? And why would a battery manufacturer say this?
Larry
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