>From my personal experience.
Not true. If you put 80Aoutput potential on the input of a 40A PWM controller, the output breaker will trip (assuming it is a 40A breaker). If there is not an output breaker, you will smoke the controller. The C-40 does not have a output current limit setting, like most MPPT controllers. This is not the case for a MPPT controller (generally speaking). I use MPPT controllers to charge 12V battery banks from 48V banks. I tried using a PWM controller for this purpose and found that it did not work. Good luck! From: [email protected] [mailto:[email protected]] On Behalf Of Chris Mason Sent: Thursday, October 25, 2012 5:50 AM To: RE-wrenches Subject: Re: [RE-wrenches] C-40 question It does "take". Your charge controller controls the load and current, hence the name "controller". It is not a fixed resistance. If you program a charge rate limit, the controller will control the current flow to limit the charge rate, hence it is "taking" a certain current up to the limit of the source's ability to supply that current but not above, regardless of the size of the array. On Wed, Oct 24, 2012 at 10:17 PM, Richard L Ratico <[email protected]> wrote: Huh? The equipment does not "take" or "draw" anything. The electrical pressure of the source, called voltage, forces electrons through the load. Electrons per unit time are called current. The current is only limited by the resistance of the load, in accord with Ohms Law. The resistance of the load acts as a valve or choke point in the circuit, thus limiting the current. In the case Allan describes, the battery is the primary resistance in the circuit. If the battery was large enough and, or, sufficiently discharged (low resistance), and the source could provide enough current, the C-40 would "Toast". Dick Ratico --- You wrote: Because it is not 80 amps current flowing, it is a capacity of 80 amps. Think of it this way. Your toaster is plugged into an outlet that is powered by the grid. The grid has infinite capacity. Why doesn't your toaster explode? Because it takes the current it needs. Now, increase the voltage and you may have a runaway current situation, but at the design voltage the equipment takes the current it needs up to the limit if the supply. --- end of quote --- _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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