# 6v battery charger conflict

D

#### Dave, I can't do that

Jan 1, 1970
0
Hi All,

Recently bought a weather station that wireless transits data to an inside console. It has four AA Alkaline cells and a small (about 1" square) solar panel to help trickle charge the batteries.

All good, but the batteries are lasting only about four weeks. It is a major thing to get the station down from the pole on top of the garage to replace the batteries.

Because it is outside and I don't care what it looks like, I want to use a sealed 6v 1.2AH lead acid battery and a 6v solar charging panel.

I will remove the Alkaline batteries, run wires to the lead acid, but the question is, do I need to do something about that small solar panel charge? I was thinking just put a diode in series with the battery positive going to the station so nothing can come back to the lead acid battery.

Would that all work or do I need something fancier?

Thanks

Dave

J

#### Jamie

Jan 1, 1970
0
Dave said:
Hi All,

Recently bought a weather station that wireless transits data to an inside console. It has four AA Alkaline cells and a small (about 1" square) solar panel to help trickle charge the batteries.

All good, but the batteries are lasting only about four weeks. It is a major thing to get the station down from the pole on top of the garage to replace the batteries.

Because it is outside and I don't care what it looks like, I want to use a sealed 6v 1.2AH lead acid battery and a 6v solar charging panel.

I will remove the Alkaline batteries, run wires to the lead acid, but the question is, do I need to do something about that small solar panel charge? I was thinking just put a diode in series with the battery positive going to the station so nothing can come back to the lead acid battery.

Would that all work or do I need something fancier?

Thanks

Dave
Unless you have the rechargeable alkaline cells, the standard types are
not rechargeable.

Have you tried rechargeable types? you may get a lot more time out of
them. I have replaceable types in my solar lighting for my drive way and
they have lasted for 3 years now. The panel charges them during the day.

Jamie

D

#### [email protected]

Jan 1, 1970
0
(1) Ordinary alkaline batteries _are_not_ rechargeable.  Are you using
the rechargeable type?

(2) Does the ¡ 1" ! solar cell actually charge anything?  Or are they
part of the "green hoax" ?

...Jim Thompson
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From Wiki

Ordinary alkaline batteries can be charged with a current pulsed at a
rate of 40 to 200 pulses per second, with an 80% duty cycle. Pulsed
charging appears to reduce the risk of electrolyte — usually potassium
hydroxide (KOH) — leakage. The charging current is usually very low
to avoid rapid production of gasses that can rupture the cell. Cells
that have leaked electrolyte are a safety hazard and unsuitable for
reuse.

My experience is that ordinary alkaline batteries can be charged if
they have been discharged to about 1.3 volts.

Dan

J

#### Jasen Betts

Jan 1, 1970
0
Hi All,

Recently bought a weather station that wireless transits data to an
inside console. It has four AA Alkaline cells and a small (about 1"
square) solar panel to help trickle charge the batteries.
Because it is outside and I don't care what it looks like, I want to
use a sealed 6v 1.2AH lead acid battery and a 6v solar charging panel.
I will remove the Alkaline batteries, run wires to the lead acid,
but the question is, do I need to do something about that small solar
panel charge? I was thinking just put a diode in series with the
battery positive going to the station so nothing can come back to the

A one inch solar panel cannot produce enough power to damage a
lead-acid battery of the size you propose so you don't need to
worry.

H

#### hamilton

Jan 1, 1970
0
Hi All,

Recently bought a weather station that wireless transits data to an inside console.

Please share the device in question.

Where did you purchase it ?

hamilton

D

#### [email protected]

Jan 1, 1970
0
First of all, please ensure that the batteries are
rechargeable.
Secondly, the 1" size for a solar panel seems unusually
small. Given that the power conversion efficiency of
solar panels is so low (maximum 25$for very high quality ones) - this tiny thing does anything useful. Thirdly, because of the low power conversion efficiency it takes a long time (5 - 7 hours) for say 4 1000 mAH rechargeable NiCd cells to charge up/ S #### Syd Rumpo Jan 1, 1970 0 Hi All, Recently bought a weather station that wireless transits data to an inside console. It has four AA Alkaline cells and a small (about 1" square) solar panel to help trickle charge the batteries. All good, but the batteries are lasting only about four weeks. It is a major thing to get the station down from the pole on top of the garage to replace the batteries. Because it is outside and I don't care what it looks like, I want to use a sealed 6v 1.2AH lead acid battery and a 6v solar charging panel. I will remove the Alkaline batteries, run wires to the lead acid, but the question is, do I need to do something about that small solar panel charge? I was thinking just put a diode in series with the battery positive going to the station so nothing can come back to the lead acid battery. Would that all work or do I need something fancier? Thanks Dave Are you sure the 'solar panel' is supposed to be for charging batteries rather than measuring sunlight? It will give bugger all power, less at night. Cheers D #### Dave, I can't do that Jan 1, 1970 0 Thanks for replies. The manual states (yes, I do read manuals) "use standard alkaline batteries.." It also suggests Li-Ion for operating in temps below 15F (I think, too lazy to get the manual to check for the actual low temp range) Manual states the solar panel is there to trickle charge the batteries. Surplus 6v 1.2mH LA battery is 4-bucks. Surplus 6v solar panel is 7-bucks. For 11-bucks, that is not many D-Cells. Grid power would cost a bunch more by the time I get a 6v transformer and build a regulated 6v PS. It makes no sense to me to use grid power if I can do it with solar. Can't see the logic behind using grid when 11-bucks will provide free power for a long long time. I am more concerned about damaging the weather station electronics by allowing the solar panel and charger circuitry pushing volts/milli-amps to the LA battery. I am sure it would not harm the LA battery, but I do not want todestroy a 200-dollar station for the cost of a$0.06 diode or something.

So, back to the original question, will a diode suffice?

It would be so nice, if for once, this forum returned a direct answer to a direct question, rather than a long debate on peripheral nonsense. I am certain there is a wealth of technical know-how here but it rarely gets to seethe light of day.

Dave

H

#### hamilton

Jan 1, 1970
0
Thanks for replies.

The manual states (yes, I do read manuals) "use standard alkaline batteries." It also suggests Li-Ion for operating in temps below 15F (I think, too lazy to get the manual to check for the actual low temp range)

Manual states the solar panel is there to trickle charge the batteries.

Surplus 6v 1.2mH LA battery is 4-bucks.
Surplus 6v solar panel is 7-bucks.

For 11-bucks, that is not many D-Cells.

Grid power would cost a bunch more by the time I get a 6v transformer and build a regulated 6v PS. It makes no sense to me to use grid power if I can do it with solar. Can't see the logic behind using grid when 11-bucks will provide free power for a long long time.

I am more concerned about damaging the weather station electronics by allowing the solar panel and charger circuitry pushing volts/milli-amps to the LA battery. I am sure it would not harm the LA battery, but I do not want to destroy a 200-dollar station for the cost of a $0.06 diode or something. So, back to the original question, will a diode suffice? It would be so nice, if for once, this forum returned a direct answer to a direct question, rather than a long debate on peripheral nonsense. I am certain there is a wealth of technical know-how here but it rarely gets to see the light of day. Dave Please share the device in question. Where did you purchase it ? hamilton B #### [email protected] Jan 1, 1970 0 Thanks for replies. The manual states (yes, I do read manuals) "use standard alkaline batteries." It also suggests Li-Ion for operating in temps below 15F (I think, toolazy to get the manual to check for the actual low temp range) Manual states the solar panel is there to trickle charge the batteries. Surplus 6v 1.2mH LA battery is 4-bucks. Surplus 6v solar panel is 7-bucks. For 11-bucks, that is not many D-Cells. Grid power would cost a bunch more by the time I get a 6v transformer andbuild a regulated 6v PS. It makes no sense to me to use grid power if I can do it with solar. Can't see the logic behind using grid when 11-bucks will provide free power for a long long time. I am more concerned about damaging the weather station electronics by allowing the solar panel and charger circuitry pushing volts/milli-amps to theLA battery. I am sure it would not harm the LA battery, but I do not want to destroy a 200-dollar station for the cost of a$0.06 diode or something.

So, back to the original question, will a diode suffice?

It would be so nice, if for once, this forum returned a direct answer to a direct question, rather than a long debate on peripheral nonsense. I am certain there is a wealth of technical know-how here but it rarely gets to see the light of day.

Dave

Use your common sense. Since the manufacturer requires standard alkaline cells, there is no charging current going into the batteries. It is not necessary to use a diode.

J

#### josephkk

Jan 1, 1970
0
Thanks for replies.

The manual states (yes, I do read manuals) "use standard alkaline batteries." It also suggests Li-Ion for operating in temps below 15F (I think, too lazy to get the manual to check for the actual low temp range)

Manual states the solar panel is there to trickle charge the batteries.

Surplus 6v 1.2mH LA battery is 4-bucks.
Surplus 6v solar panel is 7-bucks.

For 11-bucks, that is not many D-Cells.

Grid power would cost a bunch more by the time I get a 6v transformer and build a regulated 6v PS. It makes no sense to me to use grid power ifI can do it with solar. Can't see the logic behind using grid when 11-bucks will provide free power for a long long time.

I am more concerned about damaging the weather station electronics by allowing the solar panel and charger circuitry pushing volts/milli-amps to the LA battery. I am sure it would not harm the LA battery, but I do not want to destroy a 200-dollar station for the cost of a $0.06 diode orsomething. So, back to the original question, will a diode suffice? It would be so nice, if for once, this forum returned a direct answer toa direct question, rather than a long debate on peripheral nonsense. I am certain there is a wealth of technical know-how here but it rarely gets to see the light of day. Dave With that small of solar cell against that LA battery it should suffice. The battery will regulate sufficiently to protect the instrument as long as it lasts. I would be more worried that tiny solar cell won't be enough the overcome the LA self-discharge. Perhaps using rechargeable lithium 1.5 v AA cells would work better. ?-) G #### Greegor Jan 1, 1970 0 Thanks for replies. The manual states (yes, I do read manuals) "use standard alkaline batteries." It also suggests Li-Ion for operating in temps below 15F (I think, toolazy to get the manual to check for the actual low temp range) Manual states the solar panel is there to trickle charge the batteries. Surplus 6v 1.2mH LA battery is 4-bucks. Surplus 6v solar panel is 7-bucks. For 11-bucks, that is not many D-Cells. Grid power would cost a bunch more by the time I get a 6v transformer andbuild a regulated 6v PS. It makes no sense to me to use grid power if I can do it with solar. Can't see the logic behind using grid when 11-bucks will provide free power for a long long time. I am more concerned about damaging the weather station electronics by allowing the solar panel and charger circuitry pushing volts/milli-amps to theLA battery. I am sure it would not harm the LA battery, but I do not want to destroy a 200-dollar station for the cost of a$0.06 diode or something.

So, back to the original question, will a diode suffice?

It would be so nice, if for once, this forum returned a direct answer to a direct question, rather than a long debate on peripheral nonsense. I am certain there is a wealth of technical know-how here but it rarely gets to see the light of day.

Dave

Please post the make, model and source of this weather station.

Was it like this one?

http://www.weathershack.com/la-crosse-technology/ws-8120u-it-br-t.html

[...]
-One TX61U-IT solar powered remote sensor included
-High-efficiency solar panels maintains full charge with minimal light
and stores solar power for continuous operation
-Receiver rechargeable alkaline batteries can be replaced with
rechargeable alkaline or regular alkaline batteries by changing switch
from Solar to Battery

C

#### Charlie E.

Jan 1, 1970
0
Thanks for replies.

The manual states (yes, I do read manuals) "use standard alkaline batteries." It also suggests Li-Ion for operating in temps below 15F (I think, too lazy to get the manual to check for the actual low temp range)

Manual states the solar panel is there to trickle charge the batteries.

Surplus 6v 1.2mH LA battery is 4-bucks.
Surplus 6v solar panel is 7-bucks.

For 11-bucks, that is not many D-Cells.

Grid power would cost a bunch more by the time I get a 6v transformer and build a regulated 6v PS. It makes no sense to me to use grid power if I can do it with solar. Can't see the logic behind using grid when 11-bucks will provide free power for a long long time.

I am more concerned about damaging the weather station electronics by allowing the solar panel and charger circuitry pushing volts/milli-amps to the LA battery. I am sure it would not harm the LA battery, but I do not want to destroy a 200-dollar station for the cost of a $0.06 diode or something. So, back to the original question, will a diode suffice? It would be so nice, if for once, this forum returned a direct answer to a direct question, rather than a long debate on peripheral nonsense. I am certain there is a wealth of technical know-how here but it rarely gets to see the light of day. Dave Dave, Make sure that this is actually six volts, and not 3 volts. My weather station has six batteries, but the are two batteries in parallel. You could buy a solar charger/supply for mine, and had two of them cook out in less than a few months. The manufacturer was in Canada, and I am in the low desert in CA. The system couldn't take the heat... Once I realized this, I just use good alkaline cells and go months without changing batteries. Helps to put the battery pack/transmitter in a relatively cool spot... Charlie C #### Charlie E. Jan 1, 1970 0 Dave, Make sure that this is actually six volts, and not 3 volts. My weather station has six batteries, but the are two batteries in parallel. You could buy a solar charger/supply for mine, and had two of them cook out in less than a few months. The manufacturer was in Canada, and I am in the low desert in CA. The system couldn't take the heat... Once I realized this, I just use good alkaline cells and go months without changing batteries. Helps to put the battery pack/transmitter in a relatively cool spot... Charlie Make that FOUR batteries, in series-parallel... ;-) J #### Jeff Layman Jan 1, 1970 0 Thanks for replies. The manual states (yes, I do read manuals) "use standard alkaline batteries.." It also suggests Li-Ion for operating in temps below 15F (I think, too lazy to get the manual to check for the actual low temp range) Manual states the solar panel is there to trickle charge the batteries. Surplus 6v 1.2mH LA battery is 4-bucks. Surplus 6v solar panel is 7-bucks. For 11-bucks, that is not many D-Cells. Grid power would cost a bunch more by the time I get a 6v transformer and build a regulated 6v PS. It makes no sense to me to use grid power if I can do it with solar. Can't see the logic behind using grid when 11-bucks will provide free power for a long long time. I am more concerned about damaging the weather station electronics by allowing the solar panel and charger circuitry pushing volts/milli-amps to the LA battery. I am sure it would not harm the LA battery, but I do not want to destroy a 200-dollar station for the cost of a$0.06 diode or something.

So, back to the original question, will a diode suffice?

It would be so nice, if for once, this forum returned a direct answer to a direct question, rather than a long debate on peripheral nonsense. I am certain there is a wealth of technical know-how here but it rarely gets to see the light of day.

Dave

There is something wrong with your weather station if AA cells last only
a month.

I have a LaCrosse WS2350 which takes input from a wired rain gauge and
anemometer. It the transmits the data from those and the inbuilt
temperature and humidity sensors wirelessly to a base station. The
first set of 3 alkaline AAs lasted 20 months before they needed
replacing (the manual states that the battery life is approximately 12
months). The second set has already been going a year.

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