c-40 battery charging [RE-wrenches]

[Roy Dyngen]

Whether the unit is in bulk or float, the C40 does not current limit.  In a
nutshell, the battery side of the C40 can be configured in parallell, the
array/load side cannot.

Roy Dyngen
Xantrex Technology Inc.

-----Original Message-----
From: Darryl Thayer [mailto:daryl_solar at yahoo.com] 
Sent: Thursday, October 09, 2003 9:51 AM
To: RE-wrenches at topica.com
Subject: RE: c-40 battery charging [RE-wrenches]

Can the C40 be paralleled on the load side? how about
the idea that one C40 will raise the battery voltage
by charging and the second will think the voltage is
to high and NOT go into bulk charge, and stay in
float, thereby essentially shutting off on array?  

--- Roy Dyngen <roy.dyngen at xantrex.com> wrote:
> I wouldn't parallel them on the load side in
> diversion control for the same
> reason as charge control.  You can parallel on the
> battery side in any
> configuration.
> 
> Roy Dyngen
> Xantrex Technology Inc.
> 
> -----Original Message-----
> From: sunwise [mailto:sunwise at cheqnet.net] 
> Sent: Wednesday, October 08, 2003 2:40 PM
> To: RE-wrenches at topica.com
> Subject: RE: c-40 battery charging [RE-wrenches]
> 
> I believe you could parallel two C40s if they were
> used as diversion
> regulators.  Interesting to note, they still operate
> as a three stage
> charge control when used as diversion regulators.  
> 
> If it wasn't for the fact that I like MPPT charge
> controllers so much,
> this is what I'd be using on almost all PV systems. 
> Instead of wasting
> extra energy during the sunny summer months, you can
> dump it into a hot
> water tank.
> 
> Kurt Nelson
> 
>  
> 
> -----Original Message-----
> From: Roy Dyngen [mailto:roy.dyngen at xantrex.com] 
> Sent: Wednesday, October 08, 2003 3:54 PM
> To: RE-wrenches at topica.com
> Subject: RE: c-40 battery charging [RE-wrenches]
> 
> Hi Daryl,
> 
> You cannot parallel two C40's on the array side. 
> Once one of the units
> starts to regulate, the other will see the total
> array current and
> become
> overloaded or over-temped. Once it shuts down, the
> same thing would
> happen
> to the first unit. You must separate the arrays.
> 
> Roy Dyngen,
> Xantrex Technology Inc.
> 
> -----Original Message-----
> From: Darryl Thayer [mailto:daryl_solar at yahoo.com] 
> Sent: Tuesday, October 07, 2003 11:20 AM
> To: re Wrenches
> Subject: c-40 battery charging [RE-wrenches]
> 
> Hello to all
> Can I connect two c-40 charge controllers to one PV
> array?  Such that each charges a battery string
> separately?  
> 
> The reason for the question is to separate two
> battery
> strings to prevent thermal runaway.  
> 
> Daryl


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