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SIMDOG Forums Junkie Location: Bayside Melbourne. Registered: May 2003	Re: Capacitors Wed, 16 June 2004 02:12 Quote: Deep-cycle Batteries What kind of batteries are used in PV systems? Although several different kinds are commonly used, the one characteristic that they should all have in common is that they are deep-cycle batteries. Unlike your car battery, which is a shallow-cycle battery, deep-cycle batteries can discharge more of their stored energy while still maintaining long life. Car batteries discharge a large current for a very short time -- to start your car -- and are then immediately recharged as you drive. PV batteries generally have to discharge a smaller current for a longer period (such as all night), while being charged during the day. The most commonly used deep-cycle batteries are lead-acid batteries (both sealed and vented) and nickel-cadmium batteries. Nickel-cadmium batteries are more expensive, but last longer and can be discharged more completely without harm. Even deep-cycle lead-acid batteries can't be discharged 100 percent without seriously shortening battery life, and generally, PV systems are designed to discharge lead-acid batteries no more than 40 percent or 50 percent. Also, the use of batteries requires the installation of another component called a charge controller. Batteries last a lot longer if care is taken so that they aren't overcharged or drained too much. That's what a charge controller does. Once the batteries are fully charged, the charge controller doesn't let current from the PV modules continue to flow into them. Similarly, once the batteries have been drained to a certain predetermined level, controlled by measuring battery voltage, many charge controllers will not allow more current to be drained from the batteries until they have been recharged. The use of a charge controller is essential for long battery life. Next Page >> http://science.howstuffworks.com/solar-cell10.htm [Report message to a moderator]

	Subject	Poster	Date
	Capacitors	dimmy77_03	Tue, 15 June 2004 13:33
	Re: Capacitors	lang	Tue, 15 June 2004 13:37
	Re: Capacitors	CrUZsida	Tue, 15 June 2004 23:00
	Re: Capacitors	Sigmeister	Tue, 15 June 2004 23:31
	Re: Capacitors	CrUZsida	Tue, 15 June 2004 23:45
	Re: Capacitors	Johnny	Wed, 16 June 2004 01:01
	Re: Capacitors	SIMDOG	Wed, 16 June 2004 01:44
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 01:53
	Re: Capacitors	lang	Wed, 16 June 2004 04:27
	Re: Capacitors	SIMDOG	Wed, 16 June 2004 01:56
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 02:02
	Re: Capacitors	SIMDOG	Wed, 16 June 2004 02:12
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 02:28
	Re: Capacitors	SIMDOG	Wed, 16 June 2004 02:31
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 02:37
	Re: Capacitors	SIMDOG	Wed, 16 June 2004 02:45
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 02:52
	Re: Capacitors	SIMDOG	Wed, 16 June 2004 03:00
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 03:04
	Re: Capacitors	SIMDOG	Wed, 16 June 2004 05:02
	Re: Capacitors	lang	Wed, 16 June 2004 05:21
	Re: Capacitors	dimmy77_03	Wed, 16 June 2004 08:49
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 22:26
	Re: Capacitors	gianttomato	Wed, 16 June 2004 22:30
	Re: Capacitors	CrUZsida	Wed, 16 June 2004 22:54
	Re: Capacitors	Allan	Wed, 16 June 2004 23:45
	Re: Capacitors	THE WITZL	Thu, 17 June 2004 08:12
	Re: Capacitors	CrUZsida	Thu, 17 June 2004 08:17
	Re: Capacitors	THE WITZL	Thu, 17 June 2004 08:21
	Re: Capacitors	lang	Thu, 17 June 2004 08:17
	Re: Capacitors	Cyber-punk	Thu, 17 June 2004 10:37
	Re: Capacitors	Cool1	Thu, 17 June 2004 10:43
	Re: Capacitors	THE WITZL	Thu, 17 June 2004 11:07
	Re: Capacitors	Cool1	Thu, 17 June 2004 11:12
	Re: Capacitors	THE WITZL	Thu, 17 June 2004 11:35
	Re: Capacitors	Toobs	Thu, 17 June 2004 11:51
	Re: Capacitors	THE WITZL	Thu, 17 June 2004 12:12

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