[RE-wrenches] Breakers weakening?

[Kirk Herander, VSE]

That's what I expected to find, i.e. evidence of a heat event / loose connection at the breaker terminals (discolored and / or melted wire insulation, etc.), no visual evidence or smell.


Kirk Herander / kirkh at vermont.solar [mailto:kirkh at vermont.solar]
Owner|Principal, VT Solar, LLC
Celebrating our 30th Anniversary 1991-2021!!
www.vermont.solar [https://nam02.safelinks.protection.outlook.com/?url=www.vermontsolarnow.com&data=02%7C01%7C%7C9f0330d75a244870112408d685311841%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636842843233477645&sdata=0NjyuKeQbEK6245SNnk8X4XnP9Q%2B%2BqtvcALkdDghvk4%3D&reserved=0]
dba Vermont Solar Engineering
802.863.1202

On 5/8/2021 7:32:53 PM, Dave Tedeyan <dave at sungineersolar.com> wrote:
Kirk,
Could there be a loose wire connection to the breaker? That could cause it to heat up an trip sooner than it otherwise would.
Cheers,
Dave

On Sat, May 8, 2021, 2:13 PM Kirk Herander, VSE <kirkh at vermont.solar> wrote:

I have a system where the SE10000 inverter fried internally. The 60A AC output breaker tripped several times, as a result of the homeowner resetting over and over until he called me.
I replaced the inverter under warranty and all is fine, except on sunny days the breaker will trip at about 40A, close to the max output of the inverter. Reset it outside of peak inverter output and its good. I assume the breaker has weakened from stress of some sort, so I replaced it and time will tell.
Anyone ever seen a breaker have it's trip point reduced like this?


Kirk Herander / kirkh at vermont.solar [mailto:kirkh at vermont.solar]
Owner|Principal, VT Solar, LLC
Celebrating our 30th Anniversary 1991-2021!!
www.vermont.solar [https://nam02.safelinks.protection.outlook.com/?url=www.vermontsolarnow.com&amp;data=02%7C01%7C%7C9f0330d75a244870112408d685311841%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636842843233477645&amp;sdata=0NjyuKeQbEK6245SNnk8X4XnP9Q%2B%2BqtvcALkdDghvk4%3D&amp;reserved=0]
dba Vermont Solar Engineering
802.863.1202

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