[RE-wrenches] Radian - Mate 3 incorrect high voltage reading

[drake.chamberlin at redwoodalliance.org]

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.

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.

Thank you!

Drake

Drake Chamberlin
Athens Electric LLC
OH Electrical Contractor License 44810
NABCEP Certified Solar PV Installation Professional
740-856-9648

---

On 2025-04-06 09:25, Mac Lewis via RE-wrenches wrote:

> Also look for loose connections and corrosion.  If it tries to push 
> current and the voltage rapidly rises, it can indicate resistance 
> somewhere.
> 
> Good luck!
> 
> On Sun, Apr 6, 2025 at 7:20 AM Maverick Brown via RE-wrenches 
> <re-wrenches at lists.re-wrenches.org> wrote:
> Maybe the Calibrate setting got changed somehow.
> 
> OpticsRE: Device Map, Inverter, Calibrate.
> 
> From the Mate: Lock, 141, Settings, Inverter, Calibrate.
> 
> Make sure the settings are Zero offset or at least appropriate.
> 
> Thank you,
> 
> Maverick
> 
> Maverick Brown
> Off-Grid Solar Commander since 2006
> Maverick Solar Enterprises, Inc.
> * Solar Commander Remote Power
> * SunFlow Systems Cathodic Protection
> maverick at mavericksolar.com
> 512-460-9825
> 
> On Apr 5, 2025, at 1:22 PM, Drake Chamberlin via RE-wrenches 
> <re-wrenches at lists.re-wrenches.org> wrote:
> 
> A Radian 4048 disconnected from the grid with a high grid voltage error 
> showing on the Mate 3. The Mate 3 was displaying a voltage of 279 - 280 
> V. The Mate 3 was replaced with another Mate 3, and the high voltage 
> reading remained.
> 
> When the voltage was checked with two separate multi meters, the 
> readings came out to 249 - 250 V. I believe that the 249 - 250 volt 
> reading is correct.
> 
> The incorrect, high voltage reading seems to be coming for the 
> inverter, not the Mate 3, since two Mates were used.
> 
> Has anyone experienced this?
> 
> What could be the cause and solution to the problem?
> 
> Thank you,
> 
> Drake
> 
> Drake Chamberlin
> Athens Electric LLC
> OH Electrical Contractor License 44810
> NABCEP Certified Solar PV Installation Professional
> 740-856-9648
> 
> --
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   --

   Mac Lewis

"Yo solo sé que no sé nada." -Sócrates
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