Approximately, how long in full sun to fully charge a car battery starting at half charge?
993086
To many variables to say. 30w is pretty small to bring back a battery thats still connected to the car because there would still be a drain from the car electronics. The ah rating of the battery is also a factor. Its possible that the 30w panel might never return the battery to full charge.
993087
Really depends on the size of the battery. It puts out 1.8 amps, so if nothing else is pulling it down , it should charge in a day of direct sunlight.
166681
That is a good question. I've never let my battery go completely discharged. I try to start up my bike at least once a month during the winter. All that said, from a 75% charge to maint mode takes about an hour or so and from 95% about 20 minutes. I have little confidence in the %age numbers anyway, as other reviewers have reported large variations with little or no logical explanation. Hope this helps.
277440
Full charge on Solar charger? I can't be sure but seems like it was charged in a few hours. My iPhone was 100% in 30 to 45 minutes, maybe less.
137359
Yes, if you get sufficient sun exposure to fully charge the higher capacity battery. It takes six hours to fully charge the 1000MAH that comes with the N200, so a 1500MAH battery (MUST BE NiMH of the AA size) would likely take 9 hours of direct sunlight to fully charge. (In Winter I only get eight hours of light and six hours of 'direct' sunlight, here in Idaho. I wouldn't be benefited by a battery that large.) The thing is, that six hours of light at night is already enough in Winter (let's me burn the lamp from 4 or 5pm to 10 or 11pm) and MORE than enough in Summer (when the sun goes down at 10pm in Idaho), when you may need very little artificial light. So weigh the need for additional light against the cost. I might opt for a second bulb instead of a higher capacity battery. Two bulbs provide a solution that only requires six hours to charge and allows the choice of either longer run time or more light. And at the same time provides a back up unit.
1409240
I always charge the battery in the night time. It usually takes eight hours to get fully charged.
1389240
No...It has to be direct sunlight. Also, the solar charger takes a long time to recharge the battery. I basically just used it as a secondary battery and charged it from the wall socket the night before. I think the solar charger would only help if you had several days to charge it. I left it on my dash once for a week and it barely charged half way.
2043939
about 30 seconds of cranking will charge it for 15 minutes or more. I haven't found myself cranking it all the time as it tends to get enough sunlight to keep it reasonably charged.
1208101
For me it took about 2-3 hours. The first full charge may take a bit longer. Also depends on your charger, and the settings at which you charge your battery.
1199463
It can take between one and a half to two hours to charge the battery if charged when about 15% of the charge remains. I usually do not let mine completely run out but based on the time it takes for 85% of the battery to charge, I would estimate two hours and twenty minutes to two and a half hours for a full charge.
1558903
I have found it best to run a 10 watt solar panel and double the battery size. If all goes ok I can get about 2 years out of the battery. As others have answered, if the sun is not shinning the solar panel is not charging. When we get an extended period without sun I will pull the battery and charge it with a battery charger
1764519
I would charge it for a full 15 hours before using it. They usually come partially charged, so doing a full charge is the best way to be sure.
283490
The first time for full charging is close to 12 hours, regular charging after that will be one our or less
1503579
My 12V car battery rated at 715CCA took around 2 days to fully charge. It was a discharged battery unable to start the car but not totally dead.
513949
I would think so, for as long as you have sunlight or daylight, you are charging with a couple of watts. You should measure the amp draw of your system though. My particilar vehicle has constant amp draw of 2 to 3 amps and with this solar charger, can extend the life of a full charged battery to about 3 weeks as it only charges during sunlight hours. If I were to disconnect the battery, thus removing the amp draw, it would stay fully charged with this solar charger.
1090210
Yes, but very slowly. For instance, it would take 7 perfect sunny days to charge a car battery sized battery. If you bought 7 panels, then it would do it in a day.
33614
Sure I do it all the time when I super charge/equalize my batteries. I usually run it in starter mode for 30 minutes.
1275536
Remember that you are pushing amps back into the battery, and with normal losses this 5.3A panel and charger will likely give you 4.5 amps per hour at the battery in good to excellent lighting conditions (that's what I'm getting here in central Indiana). In a day, consider that you'll have 6 hours of bright sunlight, and another 4-6 of indirect sunlight. Conservatively that's about 8 hours of (8 hours x 5 amps) or 36 to 40 Amp-hours restored. That's enough to restore your 85 Ah battery each day if you take it down to 60%. This system should be fine for your battery--and others might point out I'm being very conservative. Even in late afternoon in indirect light I'm getting 4+ amps. You may find a fully-recharged battery each day by mid-afternoon.