AC200L: PV relay click

My AC200L starts to click periodically under low light PV situations. This seems to happen around 10V. I blieve this is the MPPT charger trying to enable the PV input but fails due to low voltage conditions. This happens in the morning and evening hours when the sun is raising or close to dawn. Two days ago there was a DSP update but it did not change this behavior.

S/N: AC200L2402002047741
IOT: v9041,06
ARM: v2131,04
DSP: v2130,09

@ftrueck DSP v2130,10 will reduce relay switching frequency. I will send the firmware update for you to test.


I have the same issue.

The update seemed to improve the situation. The clicking is still there but the time period in total is much shorter. Maybe over time the developer finds a solution that is even better, but for now I am thankful for the help.

Post your serial number and your dsp version. I think you could get the update also then.

AC200L2352000254639 Is the sn
Dsp is v2098.10

@ryanyoder The firmware will be sent in 12 hours.

Cool thanks a lot . I’ll try it out

Could I also please have this update sent. I have the same consistent relay click from PV under low light.

DSP v2130.09

That must be what I occasionally hear, but it’s random during the day. Not really a constant problem though.
Sounds like when I plug/unplug my AC500 into the wall outlet, (I normally leave it unplugged.)

@bluetti_infojuststunningcomau The firmware will be sent in 12 hours.