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'[EE] Ikea solar light'
2011\01\23@163159 by Charles Craft

picon face
We're very happy with our BoGoLight. - http://www.bogolight.com/
Bought several of them a couple years for Christmas presents.

Got one of these yesterday for a kids homework desk.
SUNNAN  - Work lamp, solar powered
  www.ikea.com/us/en/catalog/products/90154371
The power pack pops out and it uses NiMH instead of NiCads.

The BoGoLight sits on a south facing window sill so gets full, direct sunlight most days.
We'll set the Sunnan in front of a south facing window but unless we pop the pack out
every day it won't be vertical facing the sun

2011\01\23@232905 by RussellMc

face picon face
> We're very happy with our BoGoLight. - http://www.bogolight.com/
> Bought several of them a couple years for Christmas presents.

Pleased you like them.
Are they SL1 (single on/off mechanical switch) or Sl2/SN2 (3 tasklight
/ 3 RoomLight modes).

> Got one of these yesterday for a kids homework desk.
> SUNNAN  - Work lamp, solar powered
>   http://www.ikea.com/us/en/catalog/products/90154371

_________

Suggestion: After reading following:

To improve usful operating hours of your IKEA SUNNAN light.

Lift Vdd pin to A705N IC
Add 10K from Vdd pin to ground
Add Rx from Vdd pin to Vdd switched.
May need small decoupling cap on Vdd pin.

Rx is as much as can be tolerated after a full local solar charge.
More Rx = lower brightness.
Guesstimate is Rx = 1k to 3k3.

This lowers the initial Vdd perceived Vdd and reduces the initial
brightness by reducing the initial current.
Initial current is 190 mAh ish or about 1 hours operation to 4 hours
of full sun.
Reducing this level somewhat will improve battery life for a given sun amount.

> The BoGoLight sits on a south facing window sill so gets full, direct
> sunlight most days.
> We'll set the Sunnan in front of a south facing window but unless we pop
> the pack out
> every day it won't be vertical facing the sun.

Adding a not too long lead from sun source with battery & PV panel
located there,  to lamp may allow charging there, using here.
Angle should be such as to have panel orthogonal to sun in 2
dimensions at true noon. Moving several times a day helps if very keen
- but not really appropriate as described.

____________

A nice reasonably minimalist design.
I am aware of them but haven't seen one "in the flesh".
I estimate the manufacturing cost to be $US3.50 - $US4 in very high
volume. Biggest single cost is probably batteries at about 30%+ of
total cost.
____________

What sort of brightness and light spread do you et, either in
absolute-subjective [tm] terms or wrt BOGO?

> The power pack pops out and it uses NiMH instead of NiCads.

All except early BOGO use NimH fwiw.

You may be surprised how much you can learn on-web about the Ikea light.

US20 but not in stock at Ikea store -
http://www.ikea.com/us/en/catalog/products/90154371

GBP 18 or 15 or 15 depending which official Ikea page you look at
Strange.
www.ikea.com/gb/en/store/gateshead/low_price
http://www.ikea.com/gb/en/catalog/products/90154371


Circuit here, plus, cct diagram and his measured  A705N constant
current LED driver stats / curves..

     blog.spitzenpfeil.org/wordpress/2011/01/03/ikea-sunnan-revisited/
     http://farm6.static.flickr.com/5284/5320657925_df8a03f3b4_z.jpg


Analysis that accompanies that here :
Does tell you several interesting things.
He says that LED does not go to full brightness when sun charged -
needs batteries to be externally charged.
That suggest overall problems or system issues.
He reports 5.8V from solar panel on Voc in sun, which is "enough".
He says LED fwd voltage (current unspecified) is 2.42V which is
surprisingly low.
4 photos starting here:

  http://www.flickr.com/photos/madworm_de/5320657925/in/photostream/

Show PCB top & bottom and cct as above.

_____

Battery pack, comments on PV panel output - 5.8V OC, 50 mA SC

 http://www.flickr.com/photos/madworm_de/4574296028/

Good info is that they use reputable BYD cells.
1200 mAh which is more than absolutely needed in this task. Good.

_

Here is an A705N data sheet which may well be the same part -
available in 1800 mA to 350 mA constant current versions in 20 mA
increments. His curves suggest this is the lowest = 190 mA version.
That explains the big batteries.

IKEA say:
// Recharging time is 9-12 hours in sunlight, but over 12 hours on a cloudy day.
When the battery is fully charged, the product will give full light
for approx. 3 hours.//

3 hours x 190 mA =~ 600 mAh.
12 hours in full sun  --> 50 mA charge, which may be about what you'd
manage in the most exceptionally good conditions.
9 hours sounds 'light".
"Over [tm] 12 hours on a cloudy day would be about right.
The "Lighting Africa" spec for a good bright near equator located
African day is 5 hours of sun (over 7 can be had at some seasons in
some locales) so that's about 2+ days charging for 3 hours full
operation. That's assuming 100% NimH battery current charging
efficincy, which you will not get [tm]. So on a good bright sunny day
expect 1  - 1.5 hours operation.

BUT the 'constant current source" curves suggest that it goes into a
more or less linear current decline below Vdd of 3.4v at a slope of
about -240 mA/Volt. ie drops 24 mA per 0.1V drop to about 0 mA at
2.6V.
This means that the light starts to tail off soon after the batteries
are below full charge and it will have  along tail of gradually
decreasing light.
Assuming the LED cooperates yo can expect ABOUT 175 mA at 1.1 V cell
(essentially full brightness), about 150 mA at 1.05 V/cell (still seen
as full brightness) 100 mA at 1 V/cell (noticeably dimmer) about 60 mA
at 0.95 V/cell and 20 mA at 0.9 V/cell (you know its dying)..
Overall this gives you a much longer run time than if the CC LED
driver worked as CC suggests - and  a agraceful decline in output.

FWIW all BOGO lights with electronics have about constant output for
about 90-95% of battery energy range. Tradeoff is lower max brightness
for same operating time and higher minimum brightness. There is a tail
which is low in energy content but long in duration.

PCB component side closeup
http://farm6.static.flickr.com/5084/5321262644_65cf1cb635_z.jpg

In light with BYD 1200 mAh cell visible
http://www.mikrocontroller.net/attachment/68587/29012010121.jpg



 Russell McMahon





http://blog.spitzenpfeil.org/wordpress/2011/01/03/ikea-sunnan-revisited/
>
> The BoGoLight sits on a south facing window sill so gets full, direct
> sunlight most days.
> We'll set the Sunnan in front of a south facing window but unless we pop
> the pack out
> every day it won't be vertical facing the sun.

2011\01\24@015310 by cdb

flavicon
face


:: I am aware of them but haven't seen one "in the flesh

My local Ikea has them at AU$19..99 - approx GBP 12.00 inc AUS GST @10%

Only in black and white :(  I would have liked a blue or red one!

Colin
--
cdb, spam_OUTcolinTakeThisOuTspambtech-online.co.uk on 24/01/2011
Web presence: http://www.btech-online.co.uk   Hosted by:  http://www.justhost.com.au
 

2011\01\24@124219 by M. Adam Davis

face picon face
I got the blue one less than a year ago, and leaving it in a window
without using it very much turns out to be the wrong setup for them.
Either it's no longer charging the batteries well, or the batteries
are no longer holding a charge.

I'll have to set some time aside to peruse the links Russell provided
to see if I can change anything.  It makes a great bedside lamp for
guests here in the basement where plugs are not as plentiful as
desired, that is - when it's charged.

I'm not going to damage my good nimh cells by using them in it until I
understand why it's working so poorly.

-Adam

On Mon, Jan 24, 2011 at 1:53 AM, cdb <.....colinKILLspamspam@spam@btech-online.co.uk> wrote:
{Quote hidden}

>

2011\01\24@132848 by RussellMc

face picon face
> I got the blue one less than a year ago, and leaving it in a window
> without using it very much turns out to be the wrong setup for them.
> Either it's no longer charging the batteries well, or the batteries
> are no longer holding a charge.

There is no reason from  the circuit shown that it would damage cells, except:

- Straight overcharging as per eneloop thread. If this is the case
then it's a major indicator of the 'rightness" of the no trickle
charge discussion. Charge rate is in 50 mA - 100 mA range. However,
cells are 1200 mAh and good quality so should be more immune to
trickle charge than larger capacity cells.

- Temperature. Above 40C charging should be limited. How hot does it get?

A "quite good" overcharge protector can be provided by using a TO92
TL431 shunt regulator across the PV panel, set to about 4.8 V.
(TO92 has far more dissipation thatn SOT23, which is needed here. Flad
heatsink may help. Depending on PV panel rating that may be at upper
end of capacity). This will clamp battery back at 1
low-current-Schottky drop below that long term. That can be refined
somewhat with a bit more glue and a few years of experience. You can
pay for more detailed advice or buy a BOGO SN2 and analyse the circuit
:-). But the above works far far better than nothing.

            Russell

2011\01\25@103155 by Peter

picon face
cdb <colin <at> btech-online.co.uk> writes:
> Only in black and white :(  I would have liked a blue or red one!

Settle for a black lamp with a fake black light, redefine darkenss as light and
achieve maximum energy savings.

-- Peter

2011\01\25@110737 by M. Adam Davis

face picon face
Charging the batteries with a good charger (the venerable Lacrosse
BC-900) shows that the cells are still good, so the problem is likely
to be that the charging is inadequate.

-Adam

On Mon, Jan 24, 2011 at 1:28 PM, RussellMc <.....apptechnzKILLspamspam.....gmail.com> wrote:
{Quote hidden}

>

2011\01\25@174409 by RussellMc

face picon face
On 26 January 2011 05:07, M. Adam Davis <EraseMEstienmanspam_OUTspamTakeThisOuTgmail.com> wrote:
> Charging the batteries with a good charger (the venerable Lacrosse
> BC-900) shows that the cells are still good, so the problem is likely
> to be that the charging is inadequate.

That's interesting.
Batteries should OVER charge long term.

What is the panel voltage in full sun?
If the panel has not degraded markedly it should be able to charge the
batteries fully. It will float them to above 1.5V each based on the
webpage that I mentioned. And charge current is (or was) 50 mA +. The
panel looked like polycrystalline silicon.

What is PV panel peak current in bright sub. Short circuit panel with
ammeter. Do it on the panel side of the blocking diode (other side
shorts batteries).

I'm getting a Sunnan sent to me from Australia by Colin.


     Russel

2011\01\25@235439 by Charles Craft

picon face
I've got the SL1 - use it mainly as a task light for short periods.
Would like to upgrade but price on the new model is enough that I have to think before clicking "Buy".

Thanks for the info on the Ikea lamp.
My son would love to open it up now but I think we better let the "new" wear off a little so the boss (mom/wife) doesn't have a fit. :-)

thanks!
chuckc


On 1/23/2011 11:28 PM, RussellMc wrote:
{Quote hidden}

>

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