Posted by fabtraninbox on November 1, 2008, 2:00 pm
i brought a solar panel from my friend. it is manufactured in 1993it
is 4 x 1.5 feet in size with 36 cells.i am not sure about the watts.
it is written 64 series probably i think it may be 64
watt.but when i checked in sunshine with out any load it is giving
19 volts, but when i check for amps i am getting only 0.2 amps. does
this panel work to charge a battery.
ABDUL RAHEEM
Posted by Eeyore on November 1, 2008, 8:54 pm
fabtraninbox@gmail.com wrote:
> i brought a solar panel from my friend. it is manufactured in 1993it
> is 4 x 1.5 feet in size with 36 cells.i am not sure about the watts.
> it is written 64 series probably i think it may be 64
> watt.but when i checked in sunshine with out any load it is giving
> 19 volts, but when i check for amps i am getting only 0.2 amps.
Short circuit amps ?
> does this panel work to charge a battery.
19 volts in full sunshine is fairly typical-ish.
Are the cells circular ? Measure their diameter and that will give the
effective panel size. And where do you live ? Insolation (the amount of
sun) varies with location. From all of this one might be able to tell if
your panel has aged.
If you connect it to a battery directly the voltage will drop due to
loading. Unless it has inherent reverse diode characteritics the battery
may lose power into the cells when it's dark.
Charging a battery this way is not clever. It's primitive and may not do
that battery any good. You really need a proper charge controller and
preferably a 'maximum power point' type.
Graham
Posted by fabtraninbox on November 1, 2008, 11:28 pm
wrote:
> fabtranin...@gmail.com wrote:
> > i brought a solar panel from my friend. it is manufactured in 1993it
> > is 4 x 1.5 feet in size with 36 cells.i am not sure about the watts.
> > it is written 64 series probably i think it may be 64
> > watt.but when i checked in sunshine with out any load it is giving
> > 19 volts, but when i check for amps i am getting only 0.2 amps.
> Short circuit amps ?
> > does this panel work to charge a battery.
> 19 volts in full sunshine is fairly typical-ish.
> Are the cells circular ? Measure their diameter and that will give the
> effective panel size. And where do you live ? Insolation (the amount of
> sun) varies with location. From all of this one might be able to tell if
> your panel has aged.
> If you connect it to a battery directly the voltage will drop due to
> loading. Unless it has inherent reverse diode characteritics the battery
> may lose power into the cells when it's dark.
> Charging a battery this way is not clever. It's primitive and may not do
> that battery any good. You really need a proper charge controller and
> preferably a 'maximum power point' type.
> Graham
Short circuit amps is 0.2
the cells are circular and 4 inches dia.
i live in india ( visakhapatnam) we have a goodshine with min day temp
22 to max day temp 45 deg.
basically i want to know if this solar panel is in working condition,
later i will proceed for next step (charging)
i came to know that 14 volts is required to charge a battery.
what is the minimum amps required.
thanks for your valuable response
ABDUL RAHEEM
Posted by PhattyMo on November 2, 2008, 2:40 am
0.2A (200ma) seems awful low for a panel that size.
200ma and an assumed 14V,is 2.8Watts. Not much at all.
fabtraninbox@gmail.com wrote:
> wrote:
>> fabtranin...@gmail.com wrote:
>>> i brought a solar panel from my friend. it is manufactured in 1993it
>>> is 4 x 1.5 feet in size with 36 cells.i am not sure about the watts.
>>> it is written 64 series probably i think it may be 64
>>> watt.but when i checked in sunshine with out any load it is giving
>>> 19 volts, but when i check for amps i am getting only 0.2 amps.
>> Short circuit amps ?
>>
>>> does this panel work to charge a battery.
>> 19 volts in full sunshine is fairly typical-ish.
>>
>> Are the cells circular ? Measure their diameter and that will give the
>> effective panel size. And where do you live ? Insolation (the amount of
>> sun) varies with location. From all of this one might be able to tell if
>> your panel has aged.
>>
>> If you connect it to a battery directly the voltage will drop due to
>> loading. Unless it has inherent reverse diode characteritics the battery
>> may lose power into the cells when it's dark.
>>
>> Charging a battery this way is not clever. It's primitive and may not do
>> that battery any good. You really need a proper charge controller and
>> preferably a 'maximum power point' type.
>>
>> Graham
> Short circuit amps is 0.2
> the cells are circular and 4 inches dia.
> i live in india ( visakhapatnam) we have a goodshine with min day temp
> 22 to max day temp 45 deg.
> basically i want to know if this solar panel is in working condition,
> later i will proceed for next step (charging)
> i came to know that 14 volts is required to charge a battery.
> what is the minimum amps required.
> thanks for your valuable response
> ABDUL RAHEEM
>
Posted by Eeyore on November 2, 2008, 5:29 am
PhattyMo wrote:
> 0.2A (200ma) seems awful low for a panel that size.
> 200ma and an assumed 14V,is 2.8Watts. Not much at all.
I fear so. But better than nothing.
Interesting data though. Maybe lifetime is currently being over-estimated or
these were originally relatively low efficiency panels.
Graham
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> is 4 x 1.5 feet in size with 36 cells.i am not sure about the watts.
> it is written 64 series probably i think it may be 64
> watt.but when i checked in sunshine with out any load it is giving
> 19 volts, but when i check for amps i am getting only 0.2 amps.