im trying to figure out how big a solar panel i need for my rv. a 15 watt panel will chage my 12volt battery how fast? how do i figure out how long the 12 volts will last for different apliances? e-mail me at macleod1518@hotmail.com
thanks
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Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.
All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page
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• Page 1 of 1
by Guest » Thu Apr 07, 2005 6:14 pm
Power = voltage x amperage, or P = V*I
A 12 V battery is hardly ever 12 v. It typically charges at about 14.4 V and discharges (into a light load) about 13.2 V, less when starting vehicle or driving other heavy loads. A typical vehicle battery may have a capacity of 72 Ah, it could drive at 7.2 A load for 10 h. (battery capacity is normally rated in terms of a 10 h discharge rate).
So your 15 W charger, at 14.4 V can put out 1.04 A, and charge a totally dead battery in 69 h, obviously less if it was only partially discharged. In general, it is bad for battery life to discharge below 50% capacity
A 12 V battery is hardly ever 12 v. It typically charges at about 14.4 V and discharges (into a light load) about 13.2 V, less when starting vehicle or driving other heavy loads. A typical vehicle battery may have a capacity of 72 Ah, it could drive at 7.2 A load for 10 h. (battery capacity is normally rated in terms of a 10 h discharge rate).
So your 15 W charger, at 14.4 V can put out 1.04 A, and charge a totally dead battery in 69 h, obviously less if it was only partially discharged. In general, it is bad for battery life to discharge below 50% capacity
- Guest
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• Page 1 of 1