<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">I don’t know if you can get any help from OB. </div><div dir="ltr">Have you tried Zonna? </div><div dir="ltr">And yes the boards have been a weak link in that design. </div><div dir="ltr"><br></div><div dir="ltr">Is this a 8048 or a 8048A?</div><div dir="ltr"><br><blockquote type="cite">On May 7, 2025, at 10:46 AM, Drake Chamberlin via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p><span style="font-size: 12pt;">The issue was the Radian 8048 disconnected from the grid on an incorrect high voltage reading. Remaking the connection to the ribbon cables seemed to solve the problem...temporarily. </span></p>
<p><span style="font-size: 12pt;">After about a week, the problem came back. This time I treated the all the contacts with the antioxidant that comes in the small tubes. All seemed well for a while, then the problem returned, and is no longer intermittent. </span></p>
<p><span style="font-size: 12pt;">Wiggling the cable connections made no difference. </span></p>
<p><span style="font-size: 12pt;">I took a close up photo of the control module as suggested, and can see no broken solder joints. </span></p>
<p><span style="font-size: 12pt;"><div><4b443fa4.png></div></span></p>
<p><span style="font-size: 12pt;">I tried turning off the power modules, one at a time, but no difference. I have checked all the settings, then did a factory reset on the unit. I had an extra ribbon cable, so was able to swap cables around. The problem did not change. </span></p>
<p><span style="font-size: 12pt;">Does this seem like a defective control module with no solution other than replacing it? <br></span></p>
<p><span style="font-size: 12pt;">Thanks,</span></p>
<p><span style="font-size: 12pt;">Drake </span></p>
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<p><em>Drake Chamberlin</em></p>
<p><em>Athens Electric LLC</em></p>
<p><em>Ohio Electrical Contractor’s License 44810</em></p>
<p><em>NABCEP Certified PV Installation Professional</em></p>
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<p id="reply-intro">On 2025-04-09 13:04, drake.chamberlin@redwoodalliance.org wrote:</p>
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<p><span style="font-size: 12pt;">For a followup, it appears that the problem was in a ribbon cable connection. After checking the power wiring and starting the inverter again, the problem still remained. </span></p>
<p><span style="font-size: 12pt;">Then, I disconnected and reconnected the ribbon cables at both ends. On restart, the voltage was with 6 V of the multi meter reading. I adjusted this out with the offset in the calibration menu. The voltage has read steady for a day now.</span></p>
<p><span style="font-size: 12pt;">Thank you!</span></p>
<p><span style="font-size: 12pt;">Drake </span></p>
<p>Drake Chamberlin<br><em>Athens Electric LLC<br>OH Electrical Contractor License 44810<br>NABCEP Certified Solar PV Installation Professional<br>740-856-9648<br><br></em></p>
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