SB304- SB50 limits [RE-wrenches]

Mon Nov 12 05:49:33 PST 2001

Hi Rick,

Thanks for the explanation.  I didn't realize the DC-DC Con. never shut off
in 48-24 mode.

I wouldn't mind the 50 amp but what I would really like to see is a amp hour
counter like the C-40 has.

Thanks
Travis Creswell
Ozark Solar
----------
>From: RV Power Products <rvpp2 at adnc.com>
>To: RE-wrenches at topica.com
>Subject: Re: SB304- SB50 limits [RE-wrenches]
>Date: Sun, Nov 11, 2001, 1:05 PM
>

>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
>>
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>
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