http://www.cleverscampcamp.com/camping-light-rechargeable/
I am looking for a large rechargeable battery that can supply around 25-40 watts for up to a week?
I need a large battery that can put out the above energy 24/7 for up to a week.
I don’t know what would work best with this or if they even make anything like it.
Basically, it is needed to supply electricity to an area where there is no plug for a long time. (plan to provide a large light for my camp while camping for a week)
Where can I get such a battery? Do they make them? If not, what is a good alternative?
25 watts, run 24/7 for a week is 4200 watt-hours.
A deep cycle battery like you would use for a trolling motor or camper will be good for (maybe) 1000 watt-hours so you would need at least 4 of them, 6 would be a good number so that you don’t totally deplete them.
If this is just a light at the campsite, does it need to be on during the day? If not, you can save a lot of power! During the summer you would only need the light after 9pm and by 7am the sun will be up, this is only 10 hours, or 250 watt-hours (with a 25 watt lamp), times 7 days is 1750 watt-hours. You could maybe get by with two good sized batteries or a pair of golf-cart batteries.
If you could set up a solar panel, this can extend your run time. A 30 watt panel ($250) would generate enough power (to recharge the battery) to run a 25 watt light for 5-6 hours. Two such panels would give you more than 10 hours of 25w light and you would only need one battery (just enough to get through the night since it would get recharged the next day).
If your light will run from the 12v battery, fine. If you are using a 120v lamp, you will need an inverter to change the 12vdc to 120vac, figure to lose 10% or more of your power in the conversion.
The battery you linked to in your other post is for a walkie-talkie radio. It would power a 25w lamp for 10 minutes if you were lucky.
TV GUY:
25 watts at 12 volts is 2.08333 amps, not 0.48
The Duracell 1800 would only run a 25 watt lamp for about 20 hours when you consider the load and standby current of the inverter. No-load inverter draw is 0.6 amps plus 2 amps for the lamp, divide into 51AH for run time.
Emergency Light – Rechargeable Flashlight – Night light – Lite Saver – 3 in 1.