SB304- SB50 limits [RE-wrenches]

[Joel Davidson]

Dear Rick,
I will be happy to buy and test a beta unit 48 volt, 50 to 60 amp controller.
Best regards,
Joel Davidson

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

==^================================================================
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
==^================================================================