Before i continue to fill placeholder 4-7, i have some little update for all interested:
Here is their answer:
+++ YAMYAM's detailed eufy cam SOLAR PANEL TEST & REVIEW +++
Hey @yamyam glad to know this solar panel works for eufycam. Something to consider in near future.
Thanks for sharing details and review!
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You are welcome bro! 
Nice to read that you like my review and extensive testing.
UPDATE: Placeholder 4 is now completely filled and available since a few minutes. Have fun reading and looking! Another 2 hours of “work” invested. Let’s see when i will find time for the last parts 5-7 
Probably not today, already “wasted” anough time for it today. And tomorrow i am busy the whole day and night, so hopefully i will find time for the last parts until weekend. Stay tuned … even more pictures and the test result is waiting for you all 
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UPDATE: Placeholder 5 is now available. Have fun reading and looking! Direct Link to Part 5: +++ YAMYAM's detailed eufy cam SOLAR PANEL TEST & REVIEW +++
The last two parts, including the result after several months of testing!
FINAL UPDATE: Placeholder 6 and 7 a.k.a. Part 6 and 7 are now available!
Have fun reading and looking tons of pictures and see THE RESULT of my extensive review!
If you don’t wanna scroll like insane:
Direct Link to Part 6: +++ YAMYAM's detailed eufy cam SOLAR PANEL TEST & REVIEW +++
Direct Link to Final Part 7: +++ YAMYAM's detailed eufy cam SOLAR PANEL TEST & REVIEW +++
IT IS DONE … REVIEW SUCCESSFULLY COMPLETED! 
I hope you all had fun reading my detailed and extensive solar panel test review!
(Invested a total of about 5-6 hours to bring it to you, hope it helps at least one other person than me)
Greetings
yamyam
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Read through all your posts @yamyam. Thanks for sharing detailed review and how-to guide, very useful if somebody wants to repeat the same efforts.
Good job bro ! 
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Does anyone made any experiences with OTHER 3rd party solar panels and would like to share them with us?
As eufy still does not offer an own solar panel (don’t let us talk about the range extender which should be available also already) and eufy cams drain faster empty than i can spell E-M-P-T-Y, i would emmediatly buy 3 or 4 of this i have reviewed here (in black).
Problem:
Amazon Germany: SOLD OUT and dealer tells me it won’t be sold anymore there.
Amazon Brexit: Available, sometimes even in black, but currently black is sold out and only 1 white left.
In the meanwhile i would even register at Amazon UK and let me send them to Germany and pay a lot of shipping.
Let’s see, maybe a wonder is happening and eufy brings finally an own solar panel which fits technically perfectly for our eufy cams and will not harm the battery or overcharge it or even be possible to adjust the loading voltage (so we could set it max in winter and middle or low in summer to prevent 95-100% loadings all the time)
Greets
yamyam
Wow this is so detailed great job love the effort put into.
Also love the sloth gif truly made the whole thing perfect
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Wow (you just got my WOW approved rating for a review) This is a great review, you can see all the effort put in to this. Great review, I love to see a great clean installation, good job Sr
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Thank you very very much! Every love and recognition for my work is welcomed 
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By the way:
This week a heat wave rolls over Germany and today a new heat record of 38.6 ° C was reached, what is exactly 101.48 ° F!
(Sidenote: Hey Trumpfool… climate change isn’t fake news and climate change will burn your ugly hairpice!)
So with maximum heat and sun the whole week…
… my solar panel could charge my eufy cams to the moon and back 
But then … for the first time … BAM! 
For the very few of you who don’t understand german:
Charging not possible! The camera battery can not be charged when the ambient temperature is above 113 ° F or below 32 ° F.
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ATTENTION - SOLAR PANEL TEST UPDATE NEWS! 
For all who are interested in my solar panel test(s) and/or solar panel powered eufy cams and/or still waiting like me for eufy releasing finally their own and perfectly tuned eufy cam solar panel, this update/addition for your information:
After i have bought the above shown and tested
noname 5V 3,5W micro-usb wall mounted solar panel for 26,99€
to power my most heavy in use eufy cam (200-300 videos daily, each 1 minute) i have bought a
WASSERSTEIN 5V 2W micro-usb wall mounted solar panel for 19,99€
for my second most in-use eufy cam, with about 100-200 videos daily, each 1 minute).
In comparison to my first solar panel, it is even cheaper, a little bit smaller in dimension, but only got 2W instead of 3,5W power:
I hope 2W will be enough to power my 2nd heavy-in-use eufy cam.
I will install it tomorrow and then will see and may report what happens 
By the way … hey @AnkerOfficial, @AnkerSupport, @AnkerTechnical, @ndalby, @TechnicallyWell … after you have added a not deactivatable watermark which is so much important, more than anything else and wasting (apart from reputation) important pixels and a clear view on the action of a security cam footage … and earned a well deserved shitstorm for it, you probably and finally will have time to develop and sell an own eufy cam solar panel and/or eufy cam solar skin case?! … Just thinking …
Does this mean you can charge the camera while it is running normally? Eg records and can see the live view while it is charging? So can I plug it in a wall plug and leave it plugged in so I never have to charge it?
P.s I am asking about eufy cam E
Thanks for any help!
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Very nice review!!
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When it comes to 5V solar panels with about 2-5 W i can confirm this as i am doing this since several months! You can do everything with the cam as usual while it is charged by a solar panel, yes.
When it comes to a pluged in cam (wired-powered) you may read this answer from me some minutes ago: Can the eufycam have a constant power supply
No matter if original eufy cam or eufy cam E, both technical the same regarding the battery and its charging.
Thanks @rgillbilly 
Little Update and Note:
The second solar panel (shown above) is installed now and working for the last 8 hours.
The cam this solar panel is powering was just fully charged. This may be the reason why the battery icon in the app is not “animated” and therefore showing that the cam is charged currently. I guess the battery is over a certain limit to show charging icon?!
But i noticed that right after re-mounting the cam and installation of the solar panel, i got several push notifications, telling me this cam is now full charged. So the charging seems to work, even if the animated charging icon not yet appeared in the app.
I will check next days, when the battery drained some juice, if the animated icon will appear.
This “The cam xyz is now fully charged” notification seem to be new and added in one of the previous updates. Nice and helpful info notification @AnkerOfficial 
But please write down even those little things in the update changelog of the app (and don’t sum it up like “fixed some things” or “made some improvements”), even if it uses spaces! It’s worth knowing about it and not just find it out by coincidence like now.
As you are well known as “Doctor Battery” in this community, i would like to ask you some question regarding this solar panel test and review above (you may fly over the review/test before answering):
As i charge my “most-in-use” eufy cams in meanwhile by solar panels, do you think permanent “mini-charging” will harm the battery or battery lifetime?! The first solar panel charges the eufy cam battery with 5V (or 6V, whatever print on the package is true) at max. 3,5 W. The second one charges the battery with 5V at max 2W. So this is the reason why i call it “mini-charging” as the battery would and could handle up to 18W i guess (9V at 2A).
Also: As i understood until yet, the cam or battery got a overcharge protection, right?
But with so small charging (2 - 3,5W at max and 100% sun) the cam never will charge to full, or very rarely. But isn’t this permanent and daily unloading (by recording) and mini-recharging (by solar panel) bad for the battery or its lifetime?
Thanks for help and answering, i guess others would be also interested in the answer, who power their eufy cams with 3rd party solar panels. (as there is no original euf cam solar panel yet on the market)
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@yamyam I typically see what the charger is capable to provide in terms of power.
Now you have 2 separate solar chargers (one with 3.5 watt output and other with 2 watt output).
Also looking at the EufyCam itself, in your stress test, the worst it did was 10 days before fully discharging.
It has 48 Watthour total power and its discharging in 10 days (give or take) so the batteries are discharging about 4-5 Watthour per day.
If the sun shines for 4-6 hours everyday the solar chargers can prevent the battery from discharging (if you begin with a fully charged EufyCam.
In my opinion you can do a permanent wiring for the solar chargers and it will keep your batteries in mostly charged state (with occasional drops in state of charge during night time or days without sun). That is good for the battery.
There is no concern for the overcharge (most modern devices have a protection against it).
3.5W @6V is a very low rate charging (about 580 mA total) and cannot damage the batteries.
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Yes, this fits my experiences in the past months with the 3,5 W solar panel (the first one). It powers my most in use cam with 200-300 videos daily and the battery is pretty stable between 3 to 4 out of 5 bars.
Sure, its summer currently and sun is shining a lot in the past weeks. I will see what happens in winter, when sun is not shining that much and snow may hide the panel too.
Yes, thought so. But with your knowledge about the eufy cam and its battery now, what would you say should be the paramaters of a solar panels at maximum?! (if looking for a new one or if the first one will fail too much in winter and i want to improve it)
5V at 2A would be 10W so i guess a 10W solar panel would be still ok or even more?
Thanks!
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If I’m getting it correct the batteries inside EufyCam are possibly Panasonic NCR18650B (rated either 3350mAh or 3400mAh).
These can easily be charged with 0.5C or lower current (meaning about 1.5 Amp charging current).
Now there are 2 in parallel so this current will get split so you can use double the value (3A)
Solar chargers have variable output (that’s why there is a Vmp and Voc ratings) Vmp is max power and Voc is open circuit voltage (no load condition).
If you hook up a 5V 2A output solar panel it will be great. It can be upped till 3A (15 watt charger) comfortably. I wouldn’t recommend going over that.
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Ecellent, thanks for the detailed answer! 
Last question:
I know that most, or even all solar panels, have variable output. Is that bad or disadvantageously for the battery or cam electronic? I have read also on some panel reviews that they have maesured some panels and can confirm a stable 5V output. So guess its a matter of quality and price of the panels.
Until yet, my first solar panel powered eufy cam still works and lives, even on heavy use and permanent recharging. As the eufy cam only exists since a couple of months, i am curious when the first customer will report the first total failure of an eufy cam 