[RE-wrenches] C-40 question

[Maverick Brown [Maverick Solar]]

>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: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] 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
<Richard.L.Ratico at valley.net> 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 ---

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-- 
Chris Mason

President, Comet Systems Ltd

www.cometenergysystems.com

Cell: 264.235.5670

Skype: netconcepts

 

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