SW 4048 Schneider Electric Hum Noise

b. ecologìcAll · September 2016

Hi.
I installed an SW4048 about 6 month ago. at random times, it make a very loud hum sound.
AC out is feeding a GE 8/16 circuit panel with only 3 breakers, one for lights and fans, one for modem and laptop, the other one for a Samsung refrigerator.
when the inverter makes de loud hum sound, if I turn of ACin breaker, the sound stops
If I turn back on ACin breaker, sound stars again
If I turn off the GE breaker for the refrigerator, the sound stops

While in off-grid mode, the refrigerator breaker is on with no hum sound

what could be?
the neighbor is connected to the same utility pole, he have an XW6048 with no problem at all

two different electrician has verify the ac and dc wiring and the said all the wiring its ok

the sound is while in Grid Support
if I turn off grid support the sound disappears, but, then the client is taking power from the grid not from the solar panels
4 Solar World 285 with an MPPT60

I have trouble shooting this for 6 month and running out of options

could be firmware?
could be a SW?
could be the refrigerator? its new

any help will be appreciated

westbranch · September 2016

A wild guess, not GT so: Have you checked the torque on all connections, especially the ground connections to do with the grid tie side?

mike95490 · September 2016

My XW lets loose with a big hum as loads cut in and out. It's likely just transformer hum as the loading increases. I can hear it vary as my front load washer runs and reverses. When the pump kicks on, it's got a big buzz for a second, then settles down to a low hum.

Dave Angelini · September 2016

You should check the serial # as there have been a few firmware changes. One was pretty big!
Since the Connext SW can't sell and only support I would say the noise you are hearing is AC1 doing it's thing, charging the battery from the grid. You are welcome to e-mail me for more. good Luck!

b. ecologìcAll · October 2016

thanks for your suggestions

all wiring have been re checked several times, but the "ground rod" because it is under concrete, under the utility meter.
the neutral and ground inside utility meter base have been checked
all house appliance are working very well with no signs of a loose ground or loose neutral

loads, are only a refrigerator, lights and fans, modem and laptop
average load is less than 500 w. typically 300w

battery charging from the SW inverter is only set to 5%, to reduce utility usage

have not check yet for firmware updates, to do list

strange thing of all, the end of the world sound stops if ACin is turned off

Dave Angelini · October 2016

I do not think that is strange, it is the grid

Set the grid charger to 0%
It would help if you describe the system?
Sometimes the only way to check a UFER ground is to drive a ground rod in and use that.

softdown · October 2016

If you have dry, sandy soil it is not unusual to need two grounding rods. I bought three for my electric fence due to the unusually dry and sandy soil.

mkimid · July 2021

mike95490 said:

My XW lets loose with a big hum as loads cut in and out. It's likely just transformer hum as the loading increases. I can hear it vary as my front load washer runs and reverses. When the pump kicks on, it's got a big buzz for a second, then settles down to a low hum.

@mike95490

How are you doing ? Can I get an advice about your experience ?

I am using XW Pro, when 4.5kW~6.0kW load (resistant load such as water heater,

and small appliances), just hum noise,

and, it is not much high.

But, I have see huge noise with central AC

minimum load is 18.5A (2.5ton), and breaker 30A.

the load should be under 6.0kW.

when start-up, it generate very big buzz noise (internally, no vibration at case) for 1~2 seconds, and then settles down to a low hum.

same as your experience.

I have seen 4~6kW spike, and it is stabilized at 2.0 ~ 2.6kW.

I guess, XW is very weak on the inductive load, How about your system ? is it ok to running ?

What is your pump power usage ?

Dave Angelini · July 2021

XW makes noise with large loads. Pretty normal since they were made in 2006.....

SW 4048 Schneider Electric Hum Noise

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