SB304- SB50 limits [RE-wrenches]

Joel Davidson joeldavidson at earthlink.net
Mon Nov 12 11:51:29 PST 2001


I'll second that. Trace and Pulse 60 amp controllers only handle 60 amps "operating
current" X 0.8 = 48 amps Isc.


jay peltz wrote:

> Hi Rick,
>
> Yep bigger is the key these days.
>
> 50 amps is a good start, and of course we will always have the need for just a
> bit more, but so be it.
>
> I have a question.  Would it be possible to use the "brains" of one unit to
> drive a slave unit, theirby maybe saving some money?  I am assuming that we are
> using the same type of panels etc.
>
> Jay
>
> peltz power
>
> RV Power Products wrote:
>
> > Wrenches,
> >
> > I'm am obviously very pleased that you like Solar Boost(tm) products and use
> > them. We very much appreciate your business.
> >
> > The products were designed primarily for 24Vin-24Vout or 48Vin-48Vout to
> > provide the highest
> > level of overall efficiency. When the modules have more power to give than
> > might be
> > available from a conventional controller, the Solar Boost controller
> > operates the modules at a higher voltage (Vmp) to extract more power. A high
> > efficiency DC-DC power converter then lowers this higher input voltage to
> > battery voltage at the output. But, as with all switching type power
> > converters, some power is lost in the conversion process. When conditions
> > are such (at high module temperature) that extra power isn't available the
> > Solar Boost stops switching type power conversion and reverts to a
> > straight-through resistive connection as with a convention controller to
> > provide as much power as possible to the batteries. With higher input
> > voltage (i.e., 48Vin / 24Vout) the DC-DC converter must always operate, even
> > when here technically is not "extra" power available. It therefore wastes
> > some power when extra power is not available compared to a 24Vin / 24Vout
> > system. For this reason, we frankly didn't expect voltage the step down mode
> > to be so popular...
> >
> > The reason power handling capability is lower in the voltage step down mode
> > is that all the components have limits; current, voltage, power and
> > temperature. Devices that have a 30A maximum safe limit still retain this
> > limit even though output voltage is lower. We endeavor to deliver
> > high quality robust products that don't run devices to the edge of their
> > limits, at what we try to have be a reasonable cost.
> >
> > We will be producing MPPT products of higher power and voltage. You could
> > help us with
> > this by providing specific guidance relative to exactly what it is you want.
> > What
> > output voltage, output current, and input voltage would you like to see. My
> > past conversations with Bob-O, have lead to the desire for an SB3048 like
> > product that could be 48V input with 24V 50A output. Would something like
> > this meet a majority of your requirements? If your preference is to discus
> > this off the list, my personal email is rick at rvpowerproducts.com or you can
> > call me at 760-944-8882 or 800-493-7877. Our primary goal is to provide you
> > with the finest products and service, and I would very much appreciate your
> > feedback on this topic. We will listen to you and make every effort to
> > produce the products you need.
> >
> > Rick Cullen
> > RV Power Products, Inc.
> > Providing Quality MPPT Solar Charge Controllers.
> > www.rvpowerproducts.com
> > rick at rvpowerproducts.com
> >
> > ----- Original Message -----
> > From: Todd Cory, Bald Mtn. Solar <toddcory at jps.net>
> > To: <RE-wrenches at topica.com>
> > Sent: Saturday, November 10, 2001 10:12 AM
> > Subject: Re: SB304- SB50 limits [RE-wrenches]
> >
> > > I agree, 30 amps at 24 volts is pretty useless as the capacity is just
> > > sufficient. I wonder why this controller is not built at the 50 amp
> > capacity
> > > like the 5024?
> > >
> > > Is Rick on the list? Maybe he would like to explain?
> > >
> > > Todd
> > >
> > >
> > > Lawrence Elliott wrote:
> > >
> > > > Lee. Yes I have run into the same problem. I like the RV allot and have
> > > > been using them almost exclusively on larger systems but they are badly
> > > > limited.
> > > > I use allot of SR100's and a twelve panel array is common. On a long run
> > > > using the 3048 it's useless since even this array is limited by the 3048
> > > > to less current than can be produced at 24. I have a system going in
> > > > that is 48 with two 12 panel SR100 and I will need to run two RV's at
> > > > slightly over half current since putting both arrays into one controller
> > > > exceeds the current just a little. Adds more cost to a system that could
> > > > be simplified.
> > > > Rick had better take the hint and get on the stick. The industry needs
> > > > something better. Hint! Hint!
> > > > Larry Elliott
> > >
> > > - - - -
> > > To send a message: RE-wrenches at topica.com
> > >
> > > Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
> > >
> > > List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
> > >
> > > Check out participant bios: www.mrsharkey.com/wrenches/index.html
> > >
> > > Hosted by Home Power magazine
> > >
> > > Moderator: michael.welch at homepower.com
> > >
> > >
> > >
> >
> > - - - -
> > To send a message: RE-wrenches at topica.com
> >
> > Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
> >
> > List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
> >
> > Check out participant bios: www.mrsharkey.com/wrenches/index.html
> >
> > Hosted by Home Power magazine
> >
> > Moderator: michael.welch at homepower.com
> >
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
> List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
> Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
> Hosted by Home Power magazine
>
> Moderator: michael.welch at homepower.com
>

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

==^================================================================
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9
Or send an email to: RE-wrenches-unsubscribe at topica.com

T O P I C A -- Register now to manage your mail!
http://www.topica.com/partner/tag02/register
==^================================================================





More information about the RE-wrenches mailing list