Solar light that requires "do not use under direct sunlight" warning

@poellot

4 жыл бұрын

When i was about 17 the power banks with built in solar panels were starting to come out. I thought awesome i better get one. I can keep it in my car and it will always be charged and ready if i need to put it in my pocket for use. Lasted a few weeks on the dash of my car in summer and it pretty much cooked the battery to the point it would only get my phone an extra 2 percent. I didnt know then that lithium batteries should not be charged at 160 degrees on my dash. I dont know if the heat only is what ruined it or if it also got overcharged from the solar panel.

@CsykKrit

4 жыл бұрын

@@poellot you're lucky it didn't immolate your car 🤨

@poellot

4 жыл бұрын

@@CsykKrit and i was top of my class in college. I can see why this world needs so many warnings. A smart kid like me even needed them.

@Jabba.1

4 жыл бұрын

I brought 4 off the bay £16 1broken 1 blew the end of the battery off after being on the side of my caravan 2 still working when they want to , good idea badly made as Clive said saved pennies in wrong places

@freshfrasier1443

2 жыл бұрын

@@poellot jesus

I would imagine that the engineers decided to substitute an internally-protected 18650 for the more usual 3 AAA NiMH batteries, but the accountants decided to procure unprotected 18650s because they were cheaper than the protected ones.

@Patchuchan

4 жыл бұрын

I was thinking the same thing some cells have a BMS board on the end of the cell.

It's very well designed to be a cheap product that breaks really quickly.

i wonder if these 18650 lithium batteries have gotten so ubiquitous and common that maybe it was cheaper then using a NiMH battery and they just switched it out.

@chrisakaschulbus4903

4 жыл бұрын

this can very well be the case, clive made a video about lithium batterys being used in one time phone chargers and e-cigs

@zodiacfml

3 жыл бұрын

it is. i bought this recently because I was hoping to extract a NiMH AA battery inside (cheaper than buying a NIMH battery), since old solar garden lights have a single AA Nimh. To my surprise, it is a lithium battery but at the form factor of a double A!

Clive thank you for schematic and details . I have 6 of those. I disconnected the diode and added the 100K resistor you mentioned and a 18650 charge / discharge control board . Now the light works fine .Tx again.

The lower case l in "light" on the branding sticker was the first red flag before it was even cracked open!

I've mentioned this before, but a number of neighbours here have similar lights, and it seems none of them work any more, gotta love outdoor solar lights that can't handle being in the sun & rain... :P

Would be nice to see some projects built around reusing these failed lamps. I have four failed ones from a friend, which failed after one summer, and kept them around in case I can repurpose some of the parts. All had their Li-Ion batteries fried. My theory was also that there didn't seem to be any over charging protection. But I liked the fact that thy shutdown instantly after they sense dark. All my PIR modules with light sensors shutdown only if it gets dark AND there is no movement, which is annoying if they are used as a nightlight inside the house, and they remain on after turning on the lights.

@WingMaster562

2 жыл бұрын

This. This is exactly what im trying to bypass

That button design is probably a great feature if you have anklebiters around in the daytime. They are very fond of pressing buttons, and then when you come to use your light at night you find it has been left on and the battery is flat.

Perfect timing Clive. Only last night I was wondering why my relatively new light was very dim despite excellent sunshine all day. "Frying tonight?"

Mine died with lack of proper sealing on the solar cells, rain got to the back of the cell and fairly quickly rotted the copper strips leading to the solder points.

Isn't "no lithium charge control" a long phrase for "bomb"?

@TestECull

4 жыл бұрын

Not with a Li-Ion cell. Lithium Polymer batteries are the ones that are violently angry when overcharged; a Li-Ion cell will generally just vent some schmoo no more dangerously than a NiCD/NiMH cell would do. Doubly so for a shitty low-capacity low-output cell like would be used in this device.

@tbelding

4 жыл бұрын

No. There has never been an example of a Lithium-Ion or Lithium-Polymer explosion. They'll catch on fire, yes, but detonation requires significant containment (which phones and laptops don't have) Basically, the cell expands, and will shatter the casing. If it happens fast enough, it'll ignite. The Lithium batteries that _will_ explode, and are dangerous as all get out, are the Lithium Primary cells, such as the CR123. You can find information about them on the candlepowerforums.com site. Those will detonate, and they release hydrofluoric acid vapor. (depending on the chemistry, of course)

@kennmossman8701

4 жыл бұрын

The current from the solar panel is too low for the battery to be a safety risk - it will degrade though.

@ucitymetalhead

4 жыл бұрын

@@tbelding christ i was just reading about that and I have a sudden urge to never use them again.

@nicktecky55

4 жыл бұрын

Yes it is, IF you're talking about a multicell installation, as in an EV. Plenty of YT vids showing it. But this one is the clearest, I would suggest. kzread.info/dash/bejne/iZh4y5OhkaSdYbQ.html One catches fire, and the rest explode in a chain reaction. There's a follow up vid from the guy running the shop, where he admits it was a stupid mistake to have attached a 'dumb' charger to the battery pack. In essence, the same as this solar light.

Have previously seen a few pictures of those types of lights, same exact design with blown cells that violently erupt from the casing.

I bought one of these from the local Chinese shop. I used your design to make it run as a day/night switch. (I added my own protection circuit and a stripped down cellphone battery)

Battery looks like a Ultrafire special.

Thank you Big Clive! I appreciate what you do, you are one of the few that I actually learn from, your AWESOME! Thanks again. My name is Guy Garrett.

Shame it's a nice case. worth saving? Maybe a salvage series in the future?

@km5405

4 жыл бұрын

maybe slap a proper charging board in and your gucci.

@needforsuv

4 жыл бұрын

or just it as a dumb nightlight

@simonhopkins3867

4 жыл бұрын

I meant a series of videos on repair, recycling, reusing some of the things Clive shows us. This light is a prime candidate.

@phantm24

4 жыл бұрын

I was thinking the same thing

Pretty much every PIR driven thing I have has gone weird or stopped working after a period of time - except the PIRs on the burglar alarm (seemingly more robust for the application). Never really figured out why - I replaced one on a night-light/emergency torch and it worked again for a bit before packing up. This light is similar to a Li-ion one I also have which has become progressively dimmer - probably the same reason due to no over-charge protection...I have had varying levels of performance from others. The other thing that dies is the lens on the front which usually disintegrates from being exposed to the sun :(

I’ve got one of these. I believe there is no overcharging protection as I have to change the 18650 battery every few months. They even saved money by direct soldering the battery into the unit instead of using a spring release clip. Cheap shortcuts leading to inbuilt redundancy.

Thanks Clive . My mom has many garden lights and many failures seem to occur, most I've been able to fix but one triggers once and then thats your lot . It is a nice ornament in it own right , its like a fairy castle type thing, she has two one which works properly and the other that as i said just triggers once. I don't really want to take it apart because they are attractive in their own right and to get to the electronics would mean breaking them pretty much. Thanks for the video interesting .

I wonder if it originally was meant to use a protected button top flashlight battery.

I had one of these go pop a year or two ago now. If i remember correctly the negative side of the battery popped with enough force to punch a hole through the outer casing and knocking it of the fence it was screwed too.

The ones of these I have packed up. Now work very nicely now that I have modified them by adding battery charging/protection and new cells.

I had 4 of these also. 3 exploded in the summer after overcharging. Got mine from Banggood and they weren't interested. I now have 4 small solar panels for a project at somepoint...

Hmm... As mentioned b4, I've got a similar light, it's dead too... among many non-working solar lights. They seem to just die for no apparent reason.

Sorry that Neville and others have had bad luck with these. I have at least 5 like this in my backyard, and a couple more that are “flat” rather than wedge-shaped so as to shine directly down rather into neighbors’ windows. Most are south-facing. All are still working fine after more than 4 years. The solar panels and/or the LED arrays shows signs of degradation and/or water intrusion, but still work well. If I replace any of them or put up others, I will use Clive’s trick of sealing the seams with nail hardener / gel , or maybe hot glue.

I have two of these types of light, but they use Nimh cells & come on at dark at a low level, thereby draining the battery even if there are no triggers. They went through last winter without trouble & are fine now.

Thanks! I bought 2 of these for parts as an unit was 3 USD . The light output is weak but not bad when powered by (5 - 1.2) VDC; USB dropped by two diodes. Sadly the solar panel and LED array are strongly affixed so it isn't likely I can pull them off - just use with the existing case.

Would be cool to build an array of these PIR sensors and make a sort of primitive IR detecting camera. Maybe use the ones that have a waveform output and write some code to raster an image based on the array signals.

The PIR input on the MCU may have been damaged by an ESD event when you were tinkering. But otherwise I agree that this design is quite bad - hard to acheive when it is also so simple.

@bigclivedotcom

4 жыл бұрын

That did go through my mind, although I do try to keep a low static risk work area.

@kareno8634

4 жыл бұрын

My thoughts EXACTLY! Tho - i lacked Title of Hazard that caused PIR fail. lol Nice to know! = )

@BenjaminEsposti

4 жыл бұрын

After all, some PIR sensors have a high impedance output. They are quite sensitive to ESD.

The Pir sensor also reacts to reflections of infrared in all surfaces. The reflection properties for infrared light of surfaces is sometimes not the same as for visible light. So your meter or the roll of tape can be very reflective for this band of light

holy shit i was freaking out like how on earth did his fingers get that tiny then i was like oh thats a blown up printout.....

I have some very similar to these and they work excellent, they always recharge in the southern facing sun, and they hold a charge well. I take them camping in Eldorado national Forest.

Always a plesure when i see a new video from clive

Well, Clive, there's an idea for a potentially great video, featuring possible flameage and the explosion containment pie dish: What happens if you constantly put 18V to a normally discharged 18650 LiIon-cell (sitting at around 2.8V) and current limit it to 1A? Might be fun! Be safe!

@BenjaminEsposti

4 жыл бұрын

It will fly out of the pie dish like a rocket and burn down his workshop.

@Seegalgalguntijak

4 жыл бұрын

@@BenjaminEsposti We wouldn't want that though.

@hojnikb

Жыл бұрын

If it's a decent cell (any of the namebrands) likely nothing. It would get really hot, but it wouldn't explode or bulge. These things have vents, so if they are overcharged, stuff vents out. if you look at the datasheet, most are actually rated to take up to 12V of absude without exploding.

Can you please teardown the PIR, we might be seeing a whole new all in one PIR sensor.

I'd love to see some real-world voltage data from one of these garden lights. Open circuit voltage will differ from load voltage, and things like shading (whether from dirt or pollen covering the entire array or from a tree branch shading just one of the cells) will change the output voltage quite significantly.

Great video Big Clive

They could have compensated by just having a charging control chip on the battery itself, but I guess that's too expensive for them.

@pauljs75

4 жыл бұрын

Was thinking along the same lines. Perhaps the circuit was designed with that in mind, and then corners were cut.

They might be relying on the fact that a protected cell is to be used to manage its own charge. I wonder if the factory cell is though. I have the same unit, will have to peek inside!

I also have two of these somewhat similar with eight pin control chip and 18650 battery and it stopped working after about ten months. It only blinks ones after covering solar panel.

I bought 4 of these and was similarly concerned over the charging circuit. In mine they did away with the battery clip and just soldered to it and hot glued it in. I was after a low powered PIR alarm trigger that was solar charged, so it may work ok for that with modification by adding a 1sBMS and resistor+zener clamp and sealing around the panel.

also you can put a depending how sunny it is in your area one or two diodes in series 0.6 diode dropper in series with the solar cell to reduce over charging risk and also put 2 k to 10 k load resistor across battery depending how sunny it is

Could you stick in a zenner for protection and a couple of diodes from the solar panel to the micro to reduce that voltage (or even another zenner to clamp that down too)?

i was getting 6.7vdc from the solar panel. mine also had hardening/yellowing on the clear covering , as did the PIR cover. mine was given to me by a friend and had the 18650 cell that was reading about 1.3vdc . i liked the brightness of the LED array , so i removed the PIR and the solar panel wires from the PCB & modified the casing and added a 9vdc battery with soft terminal connector . they worked as expected .i hung the lighting the hallway to the bathroom & would turn the switch on at bedtime and off in the morning

had some of these delivered last month but not fitted them yet. Won't hold my breath after this.

@McTroyd

4 жыл бұрын

Pull out the lithium batteries and fit 3 series-wired NiMH cells like Clive mentioned. At least that takes away the safety concern. If one current-limited the solar cell, some NiMH cells will take an endless trickle charge in stride. ("Trickle" charge being somewhere in the range of 1/10th C to 1/40th C. Example: A NiMH cell with a 1000 mA capacity would be charged no more than 100 mA current, ideally closer to 25 mA.)

@CyberlightFG

4 жыл бұрын

You can change the lithium cell for a protected one.

@whity4584

4 жыл бұрын

@@McTroyd will do that. Many thanks

I have one that cooked the battery and triggered the safety on the battery, I wonder if fitting a Tp4056 to protect the battery and the 100K resistor to the MPU would make it safe and useful?

Well, flaws aside still looks like a decent little light The ones I use are always on Low light then go full bright with motion, I have 2 on the back of the house, 1 on a swingset pointing towards the house, 2 on a pole on both sides and 1 on the awning near the front door. They do a hella great job. Due to how they work with the auto brightness mode they last all night, and if by chance they don't I can charge the batteries with a charger. Strangely enough though they don't use 18650's but a normal AA size rechargeable. They were extremely popular this summer, Walmart kept selling out of them in the stores. Couldn't you have used the FLIR to see what component was heating up to see what wasn't working with the board?

@Polite_Cat

4 жыл бұрын

you sure it's a regular NiMH AA cell? there are 14500 lithium batteries which are the size of AA cells. dont ever want to accidentally put it into a circuit meant for regular AA :)

@DigitalIP

4 жыл бұрын

@@Polite_Cat Yup, its a normal size AA rechargeable, I do have 2 lights that use 2 bigish 14500 cells that you're talking about though.

Can you make a simple circuit to put it in the casing so that you could use the parts well ? And... would a protected litihuim-cell work?

I have had awesome success with Aootek LED solar lights. From Amazon.

Too bad, there is a decent product that could have had a long life with a few components and a little care. Thanks Clive.

@avada0

4 жыл бұрын

@jerril42 That's most of the cheap chinese products ordered from china.

Put a simply shunt regulator, like tl431 with pnp transistor, and mosfet switch (for disconnect solar panel with shunt regulator from battery if no charge) to limit a charge voltage to 4.2V. Or just use a DW01 protection board (or battery with protection).

I've got a few of the versions where it only comes on temporarily when it detects movement, they've been there a couple years now and have been working fine. No idea if the battery is charge regulated.

Hi Clive looking at your video on this light my daughter has 13 of these lights and she has had two fail and now I know why due to your video thanks for that information so to save her lights could I purchase the protection circuits and fit them plus the resistor you suggest in your video thanks Bob in the UK

I actually orderd this two months ago. It came as a set of four, two worked two did not. The set i received, the battery is held loosely with a spring and easily slides out(on its own). These batteries are high capacity. I thought it was best to have a battery that was low capacity on solar chargers since the amount of light use is minimal . And is ideal when skies are cloudy, because it doesnt need hours of direct sun exposure to get charged. I opened it and did not like the set up. It did not look safe and feared something catastrophic could happen and cause a fire. Didnt bother to send back because postage would cost as much as i paid for it.

I have a couple of versions of these lights around, one screwed to a wooden shed. I haven't looked at the circuit (I know, I know) maybe I should....

Thanks for your r&d.

I’ve had 3 of these all work for a month or two and stop. They are shite. I wonder if I did add a protection circuit and s current limit resistor if it would work. Also thought of a 10K pull-up resistor on the MPU to give the voltage needed for trigger?

Watched this last night, realised I had the same one in my conservatory as a motion sensor when it was dark. Checked the voltage and the cell was at 5.2v (still working) thank you for flagging this up before it set my conservatory on fire.

@andywalker1388

3 жыл бұрын

Panic over Clive, I contacted them and this is genuinely the reply I got ……New message from: trybest6699 Top Rated Seller(13,481YellowShooting Star) 5.3V has no harm to the human body. There is no danger below 36V. do not worry.

@miragebg

2 жыл бұрын

@@andywalker1388LOL

The bulbhead atomic beam sunblast sold in the US has the problem of overcharging or running the battery down too far, I don't know which. I fixed mine by adding a protection pcb from a phone battery.

The sensor triggers for approx 15 - 30 seconds not 7 then goes off if no movement is detected, maybe that's what that built in circuit on the sensor does i.e. a built in timer.. Just a thought ;-) The booklet that came with my light which is very similar to this one minus the small side panel lights says.. Battery : Li-ion, 1300mAh, 3.7 V DC My light started to play up just as you've described after about a couple of months use, so I thought maybe it's to do with the capacity of the battery holding the charge. I replaced the battery with a TR 18650 3.7 V DC Li-ion 9800mAh and so far so good. Just had a thought after looking at your diagram again where you mention its a square wave from the PIR to the MPU, as the square wave signal is reduced by the batteries capacity being able to hold a decent voltage then it would enter into the "indiscriminate zone" for the signal which could account for the weird operating of the unit.

So if you were to design such a circuit, (as you have so well on the solar garden light), how would the schematic and parts list differ?

Great, where was this video a week ago? I just ordered one of these off Ebay.

Does the 18650 have a protection circuit built into it? Some button top cells have the protection built in. Or is that only for under voltage?

Got the same lamp installed on a wooden fence in a really sunny place for 4 months summer and it hasn't exploded or burned the entire fence yet, I feel disappointed. Need to check if it has a protected battery.

Leave the lens off pyrosensors when doing basic bench testing. (Says someone who used to design PIRs.)

You can plug in the Croc clips in the UNI-T. I have seen that the UNI-T is darn accurate at volts as well. :-)

I just received one of these from bhang goot and immediately noticed the same flaw. The battery in mine checked out to just under 1200 mAh but has no charging protection. For six bucks, it was worth taking apart and I suppose when it fails, I can try to put in a protected battery or change over to a few NiMH cells. Too bad they skimped a little too much.

I've got this same light and its lasted us well over 6 months. No complaints here.

@bigclivedotcom

4 жыл бұрын

The same case often has wildly different circuitry in it.

I bought 6 similar to this in 2019, one was installed on a west facing wall. In Australia, Queensland in Jan 2020 we had many days where the temp was over 40 degC and it went off like a bomb! blew the end of the battery off and tore a great chunk out of the side of the light... pity I can't attach a photo. am very careful where I place them now!

I have one of those - and it just exploded and the lithium battery was ejected and spewed its guts. The insides were like coiled foil paper and burnt to a cinder. The side of the lamp was 3m away and the battery around a meter away. Thank goodness it was no where near people and was outdoors.

@bigclivedotcom

3 жыл бұрын

This is happening a lot. There appears to be no charge control on some of the lithium batteries.

Hi Clive, Great video! I own 4 of these as well, they are rubbish. are the components worth making into a proper unit? I am looking into combining the units together to make one chicken coop light. Do you have any thoughts on how you would approach that? Thanks for your great videos!

Hi there been following your channel on and off for a few years and watch some of your videos I have a Blackpunt TV led I think it is 32 inch TV I purchased about 3 years ago the screen I keep getting funny lines across it it does it intermittently so I have taken a photograph is there any way to attach an image to KZread to show you you as you are really good with electronics thanks very much Ian

I have one of these in the bathroom currently the solar bit is in the window its perfect at night, no need to turn the lights on.

@radius.indrawan

4 жыл бұрын

do you experience any blackout moments in the middle of your toilet activities because of its 30-seconds power-off feature?

@radius.indrawan

4 жыл бұрын

@@paulhayhurst lol 😂

@elgorrion52

2 жыл бұрын

@@radius.indrawan Just give it a royal wave from your throne

Hey big Clive, over at the eevblog forum there is a guide on how to hack your particular clamp multimeter to have the screen go to 9999 counts and other interesting things about it.

@bigclivedotcom

4 жыл бұрын

I have toyed with updating the memory chip. I think it was a group of Russian guys who discovered it could be done.

@paulstaf

4 жыл бұрын

I have one of those, can you post a link? Thanks...

@user-bu8qn3tc6r

4 жыл бұрын

​@@paulstafIt's considered uncouth to directly link to other fora/ videos. If you search uni-t ut210e hacks you'll find quite a few long threads about the matter. Take care though, you can easily make it useless.

@drteeth7054

4 жыл бұрын

@@user-bu8qn3tc6r I doubt it as it brings extra traffic. It's called "flattery" :-)).

Gracias.desde colombia quisiera que me ayudaras como dejo que la luz quede permanente o que el tiempo sea muho mayor al que tiene. Ocomo anulo el sensor de movimiento un diagrama por fa.esplicas muy bien

perhaps this was a protected 18650 cell... some of them do have build in protection...

We where given a set as a Crimbo present which have been installed and I now have nightmares of the tree catching fire and setting the hedge alight also doesn't bare thinking about.

No charge circuitry but it has a rechargeable 18650 that's just genius

I wonder if there is a protection built into the cell. Otherwise, that thing might explode... Hot black plastic on a clear day charging at 5-6V... Yikes. It still might explode...

My dad got 2 off eBay one has just gone bang. I opened the other one and the battery voltage was 4.9v. I fixed them with a new battery (an old battery from a laptop) with added protection board bms.

I also detect movement and stay high all day. I'm a solar light.

Great, I just bought these. At least overcharging won't be a problem in the Norwegian winter...

@bigclivedotcom

4 жыл бұрын

There are a lot of different units that have different circuitry in a standard case style.

Could the microcontroller possibly be a Padauk PMS150C?

6:08 Oh lovely, it will charge the Lithium cell to 6V under daylight/sunshine! Fantastic! This is going to make the battery blow up!

Pound land has gotten an amazing selection of Halloween crap in stock, and they have some Christmas stuff too! Couldn't help but think of you when I was buying it today... I bought too much 😂

AS312 fully integrated PIR sensor has a working condition supply voltage input range of 2.7-3.3v with an absolute max of 3.6v. Sensitivity and timing is non adjustable. The 18650 cell *may* have a protection circuit inside though, if so the only issue here is subjecting the MCU to overvoltage.

@bigclivedotcom

4 жыл бұрын

Thanks. I just ordered some AM312 modules from eBay.

I always thought that it's kind of crazy to have a lithium battery in those. Isn't heat supposed to be bad for lithium ion batteries? What do you think Clive?

@bigclivedotcom

4 жыл бұрын

If it's mounted at the base of the unit it shouldn't be too bad as it's not getting heated directly.

@ronniepirtlejr2606

4 жыл бұрын

@@bigclivedotcom thanks Clive. I have a couple cheap ones but never put them outside for a full day to charge. I always charged the batteries up & use them for emergency lights.

@ronniepirtlejr2606

4 жыл бұрын

@@johncoops6897 I don't have any protected cells but thank you for the information!

Would that small-ish current of 100 ma be enough to make the lithium cell go thermonuclear?

Clive, unfortunately I found this video only after a similar issue with these solar lights. The brand I got have 30 leds. They worked faultlessly for 2 months and then one by one they all suffered the same issue; flashing at around 1 hertz until they died completely. Ebay were no help as they said it had been after the months 'protection' and the seller didn't want to know. I took one apart and suspected that the 30leds were draining the battery too much and the solar panel couldn't charge them despite living in Australia where we get blistering sunshine. I replaced the non marked 18560s with some LG hG2 cells thinking the extra capacity might solve the problem but sadly not as all 20 of them are starting to fail. I looked at the circuit board and like you was amazed that there is no charge controller to prevent over charging and more importantly over discharging of the cells. I then thought about adding one of the cheap 1s BMS boards but the solar cell doesn't seem to give enough oomph for the BMS to start working. There are other versions of these out there that do have Liion charging circuitry but it is a bit of a hit and miss as to which ones you get. By hook or by crook I will get the original units working but now have 20 cells to try and revive from around 1volt!

@bigclivedotcom

Жыл бұрын

I wonder if the solar panel is putting out decent current.

@michaellinahan7740

Жыл бұрын

@@bigclivedotcom I have had a bit more time on this today on the solar cell kicks out 6.75v in full sun and, after connecting the bms properly (it has common +ve not -ve as the documentation says!) I can get some output from the BMS but I can't measure any current going into the cell. I am going to discharge one later and replace the one in the device and see if it charges. I am still annoyed that I can't recover the 20 dead LG cells, I tried the putting the dead one in parallel with a fully charged cell for 30 seconds but all I can get is 1.38v from 0.6v. In the words of Sherlock, "The game is afoot, Watson!" I had some of the button 18650 protection circuits (the ones that have the connection going along the side of the cell) but they didn't work as they have common terminals that doesn't isolate the connection. I have got some usb-c liion charger modules (www.aliexpress.com/item/1005004654476348.html?spm=a2g0o.order_list.order_list_main.34.338c1802FVVZht) intended for power banks (1.50 Aud) on order from 'Mau's Empire of Dirt'; it has 2 input terminals, terminals for the Liion cell and 2 more as output terminals. I think I will connect the solar panel directly to the input, and the output terminals to where the solar cell was and finally take out the diode and put in a wire. This should allow the 18650 to be charged properly and the output to power the rest of the circuit. I will let you know how it goes.The frankensteining seems to have been a success; I removed the diode and piggy backed the usb-c charging board to the solar panel, connected the liion cell to the 'battery' terminal on the usb-c module and then the 'output' terminals to the battery+ and battery- on the original pcb. They have worked flawlessly for 2 weeks now and the liion cells are charged to 4.2v! Win Win.

build a proper board for it with protection for the cell

wow no protection for the battery either

10:11 i think one of our garden solar lamps has a circuit that dumps solar panel current to LEDs when the battery is full. in short, the LEDs light up under the sun. I think I've seen it only once when I placed a (manually) charged battery to the lamp.

@bigclivedotcom

3 жыл бұрын

The nature of the circuitry means that happens if the battery voltage floats too high and the solar panel voltage can exceed the forward voltage of the LED. It also happens if the battery is removed.

@zodiacfml

3 жыл бұрын

@@bigclivedotcom thanks! I can recall it also happened without the battery!

Having had these outside my front door for 3+ years they have worked without issue, and they get full sunlight throughout the summer. These are the only units I have purchased that work in the depths of winter too. Best "cheap" PIR solar lights I have brought with a decent amount of light. Still I agree the cheapness of the circuit design is terrible! but if it aint broke dont fix it!

Look alot like the ones I got on Amazon. So could I just put two batteries in instead?

@TestECull

4 жыл бұрын

6s nickel based battery pack would work a treat in these, as would a 2s Li-FE pack, as their nominal voltage ranges are right in line with what the charge circuit puts out. 1s lithium anything - no go. 2s Li-ION would not charge significantly as their 'depleted' voltage is higher than what the charge circuits can push.

Bought 4 (without the side lighting) a while back to stick on the shed. Better take one apart to see if it's similar. If so I'll try replacing the battery with a protected phone battery.

@bigclivedotcom

4 жыл бұрын

You can also get protected 18650 cells.

@michaellinahan7740

Жыл бұрын

George, did you have any success with protected 18650's, in my attempts so far the solar cell won't power the 1S BMS (those round ones usually put on top of a 'naked' cell.

God dammit, Clive. I kid you not, I purchased this EXACT model (two, to be precise) the day you uploaded. One of them just died and I wish I had notifications enabled. It was only a temporary solution, but now it's a temporary for my new impending temporary solution.

Interesting design, but if the microcontroller and PIR could withstand the panel's maximum voltage, it may not have been that bad of a design. Sure, the PIR needs stable power - at night. When there's no sun. ;) Without spec sheets, we don't know if the design was that bad or not.

This is not the first time I have seen a device with an 18650 battery and no charge control. The other was a speaker which had a diode and 2r2 resistor from 5v usb. This is a worrying trend.

How do you add a charge controller? I have tried on the output from the solar panel but the unit then does not work.