<div dir="ltr">there is a MNSPD 300 AC and a MNSPD 300 DC. are wired into the system.<div><br></div><div><div>this is a new system. Has been happening since commissioning. <br></div>it is possible that the generator is charging during those morning hours as there are likely morning loads, coffee pot, but not always as the customer just went on vacation and the breaker tripped while he was gone.<br></div><div><br></div><div>On my first return visit I re routed the controller battery + from the battery + buss bar to the battery + on the battery bank itself as this had solved an similar issue in the past. </div><div><br></div><div>So for tomorrow's visit I am planning on taking a new breaker and a new controller. Is there anything else that I should replace? </div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr">Daniel Tittmann <div>CTO</div><div>Greenwired</div><div><a href="http://www.greenwired.com" target="_blank">www.greenwired.com</a></div><div><a href="mailto:daniel@greenwired.com" target="_blank">daniel@greenwired.com</a></div><div>707-923-2001 (office)</div><div>707-206-5088 (Cell)</div></div></div></div>
<br><div class="gmail_quote">On Thu, Oct 29, 2015 at 4:19 PM, <a href="mailto:boB@midnitesolar.com">boB@midnitesolar.com</a> <span dir="ltr"><<a href="mailto:boB@midnitesolar.com" target="_blank">boB@midnitesolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Larry, because these MPPT CC's are bi-directional (for
efficiencies' sake), they can convert a large current<br>
at the battery side to a smaller current at the PV side if not
adjusted right. Normally this is just taken<br>
care of and reduced to a bare minimum by the controller watching
the voltages and currents carefully.<br>
It is technically possible though for things to not work exactly
correctly. I am not saying that this is<br>
for sure happening, but it is possible. The ramping up in
battery voltage from the chargers should<br>
be plenty slow enough for this not to be a problem but I am wildly
speculating that this could happen<br>
and cannot rule it out. There may of course be something else
completely different happening here<br>
though.<br>
<br>
If CBI breakers are being used, these are known to be extremely
fast at tripping when overloaded.<br>
<br>
Also, what, if any SPDs are connected to the system ?<br>
<br>
boB<span class=""><br>
<br>
<br>
On 10/29/2015 2:45 PM, Starlight Solar Power Systems wrote:<br>
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After the Magnum Inverter/charger samples incoming AC power, they
have a slight delay before starting the charger. Then, they ramp
up current slowly.
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<div>Even so, how will any current from any other
source pass through the breaker unless the Classic is
presenting a load? I suppose something else could be wired
through the breaker but I’m guessing Daniel would have looked
at that.<br>
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<<<Curious Larry's PICTURE GOES HERE>>><span class=""><br>
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<div>Curious Larry</div>
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<div>On Oct 29, 2015, at 1:06 PM, <a href="mailto:boB@midnitesolar.com" target="_blank"></a><a href="mailto:boB@midnitesolar.com" target="_blank">boB@midnitesolar.com</a>
wrote:</div>
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...if it turns out to be, say, a surge in battery
voltage from the generator<br>
starting up and causing a reverse current through the
battery terminals…<br>
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<div> boB<br>
<br>
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