It doesn’t work
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So I think we can all agree that for those of us with an e340 doorbell, sold on the promise of hardwire as an option to never worry about the battery, it just isn’t a reality. Sucks
I love the doorbell and ordered a second battery yesterday. I’ll make it work for now and hopefully they will come out with a real dual camera, HB3 integrated, hard-wired model. (Dream of all dreams, make it 24/7 continuous recording)
The Nest doorbell I replaced with the e340 was able to do all this with the same wiring and transformer….
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I am using a Legrand 44232 transformer and new wiring which since the updates have been released is currently working pretty well with pre-roll clips so I would advise trying to buy one of these transformers but they aren’t cheap.
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Je transformator moet > 30 VA voor goed functioneren, dus bijvoorbeeld 24 volt en 2 Ampere = 48 VA
You need a transformer 24volt and > 30VA, This infotmation you can find on internet as well. And that works perfect with me.
. According to the Eufy app you need at least a 16VAC 30VA transformer to enable pre-roll
Hi guys, thanks for your contributions!
I just got the battery alert too. I have a 16v 30VA transformer too, so I will have to buy it.
I guess all the issues started when I added the Homebase 3 too… the doorbell was working fine as stand alone, almost. I had to replace the first doorbell I received because it was not working with my mechanical doorbell, and the replacement worked at the first time. After got it the home base, I lost the mechanical doorbell, never paid attention if the wire icon was lost too at that time (2 months ago) so it may be the reason. customer service is not helpful on troubleshooting since they have the same text you can find on the website.
I just ordered a 24v 40VA transformer to see if that solved the issue of not charging… I hope my mechanical ring (which is 16v) works too and don’t get damaged.
I would double check the settings in the HB3
_ use homebase as a chime_
And also the settings in the doorbell… they may have possibly changed when you added the HB3. Make sure chime is enabled. Mechanical.
In the meantime the new higher power transformer arrived, I charged the battery and installed it back to the E340… Now, instead of the battery icon, I can see the cord switch icon on green. Let’s see how much time it last.
I too have this very same issue. Its wired in and has a transformer i used for the ring pro 2 its not charging and doeant work with battery out. Version 3.1.1.6 fw.meter reads are 27v fluctuating to 24v i have ordered another trnasformer eufi recomend. If this doesnt resolve its going back as defective warranty as only had 8 days.
@jorgevalles Do y ou already have any experience with your 24v 40VA transformer and your 16V ringer ?
I am planning to replace my transformer with a stronger one (24V) to also have more reliable pre-recording. But I have a mechanical chime (honeywell D117) which also is up to 16V.
One month working with it. My 16v chime is working fine and my eufy camera ring is still showing the plug symbol indication it is getting enough current to the work it has to do. Although, using the 24v transformer is not ideal for that chime it works fine since it is not a constantly using that potential, it’s just a short time pulse received probably any other day and 16 to 24 AC volts is not that critical. And there is no risk of somebody keep pushing the button supplying 24 v for a long time because the pulse is just sent once by the eufy ring avoiding overheating.
Thanks!
My current transformer is 16V and 2A, which is also more than enough for pre-roll. However, when I mount my Honeywell D117 in-line with the doorbell and I enable pre-roll, more current is running and the chime solenoid is activated just enough to produce a constant 50 hz. (European frequency) hum. So I already de-coupled the chime and put an ESP32 with a relay (powered in parallel by the same transformer), which now lets the chime ‘dingdong’ from Home Assistant, once someone presses the button.
But the transformer gets quite hot and always draws 7W. I hope to have found a more efficient power supply, but only the 24V version has enough VA to use preroll. Once I switch to that, the esp relay will also get 24V (which it can withstand), but the Chime will also be actuated at that voltage. I even might try to put the chime directly in-line with the Eufy again, since higher voltage means less current, so maybe the chime will stay quiet this time 
I’m pleased I discovered this site as I discovered a problem with out Eufy E340 Doorbell this morning. The battery had gone flat despite the battery being connected to the original power supply.
I tested the power at the doorbell and it was 12V. The wires aren’t small so there is minimal voltage drop between the 240-12V charger.
I removed the battery and placed it on charge through my USB Meter. The battery was charging at 4.9V 1.87A
Recharging took 3 hours
Having read the information here I decided to change the charger to a more powerful producing 12V 3.5A (approx 41Ah).
Looking at the Android App I see a small green plug icon in the Doorbell setting and the Homebase shows a green battery icon with a lightening bolt.
I’ll now monitor the system to see if the charger can keep the camera battery charged whilst it is active.
My thanks to everyone before me who teered me in the right direction to find a solution.
Hi