*BLF LT1 Lantern Project) (updated Nov,17,2020)

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write2dgray
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Please add me to the list

Lux-Perpetua
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ToyKeeper wrote:
Lux-Perpetua wrote:
ToyKeeper wrote:
From the factory, it uses the stepped ramp by default.
Can you please check once again? According to the manual and any Andúril flashlight I bought so far, SMOOTH RAMP is/was set by default. And in terms of the muggle mode the LT1 should only be using SMOOTH RAMP as this mode does not have any alternative UI, correct?
Yes, it uses the stepped ramp by default. I added a compile-time option to make that possible, specifically for the lantern, because DBSAR wanted it. It is the only Anduril-based light so far which works this way. Muggle mode is still smooth though.

@ Toykeeper + DBSAR:

Please note that I have revised the manual once again, see updated post #7333. Both German and English manuals have been updated on the sharepoint as well, see link in the OP of this thread.

I decided to include those additional information on the Muggle mode as I was able get some additional room while revising the layout again.

I really hope we're done now and Sofirn can use the final version "2019-10-05" for the print job that will enable every customer as of batch #2 to have the correct manual of the LT1 lantern. I will now start checking the text that Sofirn will be using for Amazon US/DE as they want to list the LT1 very soon. BLF member fneuf has kindly offered his/her help to translating the manual into French language. I will check with Barry on Monday if there's enough time left but it appears we have about 2 weeks left until batch #2 starts with production. I guess we've all learned that it's always a good idea to start working on the manual sooner than later. Wink

Once again, thanks to all people involved into this great project and special thanks to all BLF members that helped to get the manual ready in time. Thumbs Up  Beer 

Now, I hope I can stop bugging you guys with boring stuff about the manual. Thanks for your patience. Smile

Cheers, Thomas

sbslider
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Thanks Lux-Perpetua for all your diligent work in making the manual the best it can be! Beer

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

sbslider
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I missed several pages of posts while on vacation, but somewhere along the line I thought I saw a post saying that the second batch of lights would have slightly different firmware. Am I imagining that or is that true? which post was that described in?

thanks!

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

Lux-Perpetua
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You haven't been dreaming sbslider. Big Smile

It's right here: http://budgetlightforum.com/comment/1565824#comment-1565824

These changes - effective with the updated Andúril as of batch #2* - are already reflected in the latest revision of the manual.

(* provided that Sofirn will be using the updated LT1-Andúril, Toykeeper is about to send to them)

sbslider
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Thanks so much Lux-Perpetua! Thumbs Up

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Madtoffel
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Lux-Perpetua wrote:
I will now start checking the text that Sofirn will be using for Amazon US/DE as they want to list the LT1 very soon.
Does that mean that Sofirn is going to sell the LT1 on Amazon from the start and we don’t have to order it from China?
sbslider
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Madtoffel wrote:
Lux-Perpetua wrote:
I will now start checking the text that Sofirn will be using for Amazon US/DE as they want to list the LT1 very soon.
Does that mean that Sofirn is going to sell the LT1 on Amazon from the start and we don’t have to order it from China?

Last I heard the LT1 would be sold via Amazon in multiple countries, and that it would ship from China. I suspect nothing is a done deal yet though.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

johny723
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As long as we have the best price and get the LT1 first, let them sell it wherever they want.

MtnDon
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So, when we receive our LT1 we will be able to tell if we have first batch, second batch…. by the date on the last page of the printed manual that will come with it?

BrianK
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Please add me to the list for 2 lanterns.

Thefire
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Please add me to the list. This looks great!

nicois
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Looking at the official YouTube video, I’d like to understand a bit more about the charging. It sounds like a charger which isn’t capable of delivering 1.5A may get a bit hot unless you desolder a couple of the points inside, as shown.

I don’t mind so much about the excess heat per se, but if I plan on mainly recharging this using a 8w solar panel, which will deliver 1W at best, am I going to get more recharging efficiency by desoldering?

gadabout
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nicois wrote:
Looking at the official YouTube video, I’d like to understand a bit more about the charging. It sounds like a charger which isn’t capable of delivering 1.5A may get a bit hot unless you desolder a couple of the points inside, as shown.

I don’t mind so much about the excess heat per se, but if I plan on mainly recharging this using a 8w solar panel, which will deliver 1W at best, am I going to get more recharging efficiency by desoldering?

My experience with solar charging suggests that you are unlikely to have an issue with overheating of the charging circuit in the panel – it simply won’t produce enough power to do that. (Although, sitting in hot sun on a summer’s day doesn’t help.)

In theory, there is a chance that too much “load” may cause the panel voltage to collapse but I’ve never noted that happening with my panels. The built-in USB regulator perhaps prevents that? Even my little 7W Goal Zero still manages its full output into power banks that draw much more than that from a mains adaptor.

Den noted a small charge going in (140mA?) when charging the lantern from solar on an overcast day, so the circuit seems designed to just take what it can get.

I guess the only way to know for sure would be to do some tests with a USB power meter, solar panel and soldering iron.

Let’s hope someone with a better understanding of the electronics behind these things can chime in.

sbslider
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I agree with gadabout, I doubt you’ll see overheating of your solar panel unit’s voltage regulator. I’m not sure the adjustability between 0.75A and 1.5A is all that useful with the present design, but it is something DBSAR wanted as a capability for lower power solar panels. Hopefully he will chime in with the details as to why, as I’m curious also.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

HONDARIDER
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This has been going on for a long time. Maybe I will have one for Christmas. Maybe.

sbslider
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HONDARIDER wrote:
This has been going on for a long time. Maybe I will have one for Christmas. Maybe.

Definitely by Christmas. Maybe Christmas 2020, but definitely by Christmas. And you won’t know how you lived without it. Big Smile

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

BrianK
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It has been a long wait and I’ve been gone for most of that time. But if past BLF projects are any judge, it’ll be well worth the wait.

As usual, my hat is off to the folks who can and do get involved in these project lights.

Phlogiston
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sbslider wrote:
I agree with gadabout, I doubt you’ll see overheating of your solar panel unit’s voltage regulator. I’m not sure the adjustability between 0.75A and 1.5A is all that useful with the present design, but it is something DBSAR wanted as a capability for lower power solar panels. Hopefully he will chime in with the details as to why, as I’m curious also.
gadabout wrote:
In theory, there is a chance that too much “load” may cause the panel voltage to collapse but I’ve never noted that happening with my panels. The built-in USB regulator perhaps prevents that? Even my little 7W Goal Zero still manages its full output into power banks that draw much more than that from a mains adaptor.
If you draw too much current from a bare panel with no regulator, the voltage will plummet and you’ll lose power.

Panels with regulators vary a lot, depending on the regulator design. A panel with a basic regulator will still see plummeting voltage and lose power if you try to draw too much current. A better regulator may be able to mitigate that effect, but it will still have to throttle down the output power to do it.

This then raises the question of how the device you’ve plugged in will react to having its power supply throttled down. If it gracefully draws on whatever power is available – as many powerbanks do – you’ll be fine. If it’s picky about its power – iPhones are infamous for that – then it may just give up and stop charging at all.

That’s why the standard recommendation for charging personal electronics from portable solar power is “solar charge a powerbank, then use the powerbank to charge your other devices”. It’s less efficient – having the extra charging step costs you energy – but it’s more likely to work reliably.

You don’t need to do that for the LT1, though, it’s designed to pick up where it left off and charge whenever there’s enough power.

On a related note, some solar panels have a regulator which will turn the power off and on again from time to time. This sometimes helps in variable solar conditions, because cycling the power like that may reset a picky device and convince it to start taking a charge again. It doesn’t always work, though.

Unfortunately, manufacturers don’t seem to specify what their built-in solar panel regulators can do – they just say “5V USB output”, maybe adding a current rating and that’s it.

Ultimately, you just have to try it and see what happens (having first checked that the panel can never produce too much voltage, of course).

The ability to change the stock 1.5A charging current to 0.75A adds versatility, because a panel producing 5W – 5V at 1A, for example – will struggle (at best) with the stock 1.5A configuration. Letting people modify the LT1 to charge at 0.75A means they can adjust it to better match the lower-powered solar panels they might already have.

In addition, lower charging current also means that a larger solar panel can continue to operate even in less favourable conditions (thin, hazy cloud, for example). Some people might prefer to give their LT1 a better chance of charging in less favourable conditions, even if that means sacrificing full-speed charging in better conditions.

sbslider
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Ok, I dug through the group chat and found some testing DBSAR did with a few different solar panels. This may be in the first post as well, didn’t check there.

Quote:
OK, here is a short test of the charging ability of the LT1 test unit, using the 40-watt Poweradd folding solar panel, on a overcast (cloudy) day. The larger 40-watt Solar charger was able to reach close to the full amp-load of the LT1 test unit’s TP5100-based charging circuit on a cloudy day, ( 1.5 amps) while the smaller folding solar chargers provided less current, but the lantern still was accepting a trickle charge even with the 7-watt generic Ebay panel.


- the other panels i tested in the cloudy conditions, and the outputs were:

> 7-watt generic folding Ebay solar charger – 4.13 volts DC, at 0.17 amps. (lantern was still accepting a “trickle” charge.
> 7-watt generic folding Ebay solar charger with added 10-watt panels – 4.24 volts, at 0.31 amps.
> 10-Watt Eceen folding solar charger – 4.2 volts at 0.51 amps.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

BlueSwordM
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Oops. Too late.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

psmbfuer
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Interested as well.

Lux-Perpetua
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fneuf wrote:

Heureux de pouvoir contribuer / Glad to help

Keep me updated Smile

Bonsoir fneuf,

Sofirn is very much interested in a French translation. I'll send you further information via PM.

Merci et bonne soirée,

Thomas

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Looks nice…

Please, add me to the list for 1 piece. Thanks! Smile

DBSAR
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sbslider wrote:
I agree with gadabout, I doubt you’ll see overheating of your solar panel unit’s voltage regulator. I’m not sure the adjustability between 0.75A and 1.5A is all that useful with the present design, but it is something DBSAR wanted as a capability for lower power solar panels. Hopefully he will chime in with the details as to why, as I’m curious also.

Much like Phlogiston mentioned above, for those in off-grid areas, and with some power banks/boxes i tested the lower 0.75 amp mode does not pull the voltage down as far as 1.5 amps when using older or small solar chargers, some car adapter chargers and portable solar/generator rigs. (one example i tested is when at 0.75 amps, two devices charged stable at the same time from my boat USB power box and a few unites i tested without overloading the ports, but at 1.5 only one can be sustained. (the trade off is a longer charge time, but even then a day is plenty of time to fully top up the LT1 after a night’s of running.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

Stryker
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I’m definitely interested. Put me down for 3.

Caver_Rave
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Please add me to the group buy list for one lantern.

I’ve loved my Q8 and I’m looking for a white gas lantern alternative.

amishbill
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Please +3 my request.

DIY LT1 battery wrap image. "PDF on Google Drive":https://drive.google.com/open?id=1IHIEOi1NXu868IYNCzIM7D2Ulpxchmww

Fresh Sanyo NCR18650GAs already wrapped "for sale HERE":http://budgetlightforum.com/node/69120 if you like.

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amishbill wrote:
Please +3 my request.
Will do….that puts you up to 8 Smile
theadlee
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Please put me in for one more (three total)

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