Formula for charging time of 12v battery

[Northern Night Sky]

I have a Powerpack 300, which is a 12v battery at 12Ah.

Using the AC adapter with the house outlet (20amp at 120v) it takes 17
hours to fully charge the battery. How would I calculate the
(approximate) time it would take to charge the battery, using a solar
panel that draws 1amp at 15v (DC)?

 

[Peter Bennett]

On Wed, 9 Feb 2011 13:01:22 -0800 (PST), Northern Night Sky
<headbangerstudio@gmail.com> wrote:

I have a Powerpack 300, which is a 12v battery at 12Ah.

Using the AC adapter with the house outlet (20amp at 120v) it takes 17
hours to fully charge the battery. How would I calculate the
(approximate) time it would take to charge the battery, using a solar
panel that draws 1amp at 15v (DC)?

I assume you mean that the solar panel _delivers_ (not draws) 1 amp in
bright sun. If so, it can probably deliver 6 - 8 Ah on a sunny day.

If the battery is 12 Ah, and fully discharged, it will require about
15 Ah to fully charge it (batteries are not 100% efficient.). So, if
the battery is fully discharged, it would take the solar panel two
sunny days to recharge it. If you have cloudy days, it may take three
or four days.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

 

[Phil Allison]

"Peter Bennett"

I assume you mean that the solar panel _delivers_ (not draws) 1 amp in
bright sun. If so, it can probably deliver 6 - 8 Ah on a sunny day.

If the battery is 12 Ah, and fully discharged, it will require about
15 Ah to fully charge it (batteries are not 100% efficient.). So, if
the battery is fully discharged, it would take the solar panel two
sunny days to recharge it. If you have cloudy days, it may take three
or four days.

** Congrats - the only reply that is even close to sensible.

But the OP is a pig and deserves only swill.



..... Phil

 

On Thu, 10 Feb 2011 Phil Allison pecked:

"Peter Bennett"

I assume you mean that the solar panel _delivers_ (not draws) 1 amp in
bright sun. If so, it can probably deliver 6 - 8 Ah on a sunny day.

If the battery is 12 Ah, and fully discharged, it will require about
15 Ah to fully charge it (batteries are not 100% efficient.). So, if
the battery is fully discharged, it would take the solar panel two
sunny days to recharge it. If you have cloudy days, it may take three
or four days.


** Congrats - the only reply that is even close to sensible.

But the OP is a pig and deserves only swill.

Speaking of pigs, how's your slag of a mother? She still servicing
gloryholes in highway rest stops?