LED bulbs buzzing and pulsing...

[wayki]

Hi,

Some LED bulbs buzz - and i don't know why.

Also, when certain bulbs are switched on - others then pulse (bright to really bright in a cycle once a second or so).

What could be going on?

The rustic house is on a solar system > panels > regulator > batteries > inverter.

Laptops and phones etc never have a problem. Just LED and the other energy save bulbs.

 

[big-all]

what voltage are they
where they bought with a matching driver
is there a dimmer in the cuircuit and are they dimable

 

[Mikefromlondon]

Most likely to do with your solar power inverter, not providing a 50Hz sine wave, and so LED inverters may not be used to other types of frequencies from inverter like power with non-sinusoidal wave. When a sudden load is imposed on your main inverter, it may momentary malfunction so causing other LEds to brighten up for a split second or two before re-stabilises to designed voltage. (this a theory not as an affirmative answer) without monitoring without proper test gear (oscilloscope) it is not possible to say precisely what is going on.

 

[Stefan888]

Probably the LED bulbs have poor quality non-isolated drivers, they should work with solar inverter and other power devices without interference

these guys are expert is solar and led lighting, they may have experience this issue before

https://voltaconsolar.com/

Let me know if i can help

 

[delmel]

what voltage are they
where they bought with a matching driver
is there a dimmer in the cuircuit and are they dimable

could have used LV transformers instead of drivers, that will cause the symptoms you suggest especially on cheap old transformers. They will work, but badly and will damage or shorten lamp life.
Also LED have been around for years, early ones were extremely poor, and now market also flooded with cheap crap ones which will under perform and be disappointing. Find a good one and stick with them.

 

[bernardgreen]

what voltage are they
where they bought with a matching driver

The driver that controls the currrent that is driven through the LED element is part of the lamp.

The driver in the lamp takes power from a voltage source to produce a controlled current through the LED element(s)

The power supply to the driver maybe direct from the mains at 230 volts or from an ELV ( Extra Low Voltage ) source. The ELV source might be a Switched Mode Power Supply ( SMPS ) providing a supply which is effectively 12 volts when supplied to an incandescent lamp. These should be labelled as 12 V (eff). They are often labelled as being an "electronic transforner" or as an " LED driver "

The supply from an SMPS can very at high freqency from 0 volts to as high as 30 volts but chopped on and off in a way that the average voltage is 12 volts.

When an LED driver ( built into the lamp ) is supplied from a 12 V (eff) supply the pulsating supply voltage can make the LED driver operate in an un-stable mode and the current through the LED element cannot then be properly controlled.

 

[winston1]

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