How much voltage drop indicates a problem?<br><br><div class="gmail_quote">On Mon, Oct 15, 2012 at 8:13 AM, Chris Mason <span dir="ltr"><<a href="mailto:cometenergysystems@gmail.com" target="_blank">cometenergysystems@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">You should see a voltage drop across the connections if they are faulty.<div class="HOEnZb"><div class="h5"><br><br><div class="gmail_quote">
On Mon, Oct 15, 2012 at 8:54 AM, mac Lewis <span dir="ltr"><<a href="mailto:maclewis1@gmail.com" target="_blank">maclewis1@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hmmm,<div><br></div><div>This had factory installed bussing. I will pull it off and clean it up. Thanks. I suppose that something like this be invisible to an Amp hr meter.<div>
<div><br><br><div class="gmail_quote">On Sun, Oct 14, 2012 at 11:01 PM, William Miller <span dir="ltr"><<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Mac:<br>
<br>
We had a similar problem with a large bank of IBE 2 volt cells. The batteries had to be removed the same day they were installed and then reinstalled the next day. They sat outside for one night. The flags acquired an invisible but insidious corrosion that caused problems getting and keeping a charge. Now we insist on cleaning each flag and eyelet no more than 10 minutes prior to contact.<span><font color="#888888"><br>
<br>
William Miller</font></span><div><div><br>
<br>
<br>
At 09:41 PM 10/14/2012, you wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi wrenches,<br>
<br>
About 2 months ago, we installed an off-grid Sunny Island System. Here are the specs:<br>
<br>
8.82 kW PV<br>
SunnyBoy 8000<br>
2 x Sunny Island 5048 Inverters<br>
2490 Ahr SolarOne HUP batteries at 48V<br>
30 kW Cummins Propane Generator<br>
<br>
We are having an issue that I am having a hard time figuring out. We are getting sagging battery voltage, and can't seem to keep the battery voltage and specific gravity where we want it. In addition, I have equalized these batteries 4 times this past month, and the specific gravity gets to about 1.25-1.26 maximum. I have slowly eased up the boost, absorb and equalize voltage setpoints, to try to get the battery a better charge, but it doesn't seem to help. The Sunny Islands don't seem to have any issue getting these batteries up to the equalization voltage, or any of the other voltage set points. I have checked for loose connections, all look good here.<br>
<br>
The SOC monitor on the Sunny Island master, calculates that we are staying between 70-95% SOC on a daily basis, and yet the battery voltage has dropped below readable level a few times(I believe this is below 41V). I equalized at 62 V for 4 hours and had the same result of nonimpressive sepecific gravity and saggy voltage under small load. After we leave from equalizing the batteries, things seem to be OK for a while and then we start having issues again. We are tripping a 250A battery breaker, and getting low voltage errors on the SI, yet SOC looks good.<br>
<br>
Right now I have the set points programmed per SolarOnes advice as:<br>
<br>
Boost Voltage= 2.46 V/cell<br>
Full Charge Voltage = 2.46V/cell<br>
Equalize Voltage = 2.54V/cell<br>
<br>
Thanks in advance for any ideas that you may have.<br>
<br>
<br>
<br>
--<br>
</blockquote>
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</div></div></blockquote></div><br><br clear="all"><div><br></div></div></div><div>-- <br><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br></div></div><span class="HOEnZb"><font color="#888888">Chris Mason<div>President, Comet Systems Ltd</div><div><a href="http://www.cometenergysystems.com" target="_blank">www.cometenergysystems.com</a></div>
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Cell: <a href="tel:264.235.5670" value="+12642355670" target="_blank">264.235.5670</a></div><div>Skype: netconcepts</div><br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:'Times New Roman';font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left">
<font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Sócrates</font></span></span></span></font></p>
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