Who sells a small RF quiet solar charge controller?

[Jim Brown-10]

There's a serious misconception here too -- the maximum voltage that the
controller will handle depends on the design of THAT particular model.  
SOME MPPT controllers are designed for a max voltage of 24V, others for
48, and so on. Ditto for current ratings -- the relevant spec is the max
short-circuit DC output of the panel(s).  Genesun, the mfr whose MPPT
controllers I recommend, has several models for different voltage
ranges, at least as high as 24V battery voltage, and maybe high as 48V.
Last I looked, their biggest model was rated for 10A.

73, Jim K9YC

On Sun,3/19/2017 12:15 PM, Paula Keezer wrote:
> I have seen some misconceptions about MPPT.  The best reason to use MPPT is
> so that you can put multiple solar panels in series and you will not exceed
> the maximum input voltage of the controller.  The controller will continue
> to charge even in partial sunlight just as long as the input voltage exceeds
> the battery charge voltage (in this case 14.xx volts).  Since solar panels
> in series ADD voltage, with two solar panels you get a  24 volts (well, more
> like 32 volts in full sunlight) and when those panels are in shade, the
> individual panels may drop down below 12 volts but the sum of the two will
> be much higher than the required charging voltage.


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[Elecraft mailing list]

Just as a reminder to all (as I was the one who started this thread) this is for a K2 with a 2.9 ah battery and a 7 watt panel
I could probably get away without any controller at all due to the low wattage panel. but  I'd rather keep it a bit more foolproof.





      From: Jim Brown <[hidden email]>
 To: [hidden email]
 Sent: Sunday, March 19, 2017 4:16 PM
 Subject: Re: [Elecraft] Who sells a small RF quiet solar charge controller?
   
There's a serious misconception here too -- the maximum voltage that the
controller will handle depends on the design of THAT particular model. 
SOME MPPT controllers are designed for a max voltage of 24V, others for
48, and so on. Ditto for current ratings -- the relevant spec is the max
short-circuit DC output of the panel(s).  Genesun, the mfr whose MPPT
controllers I recommend, has several models for different voltage
ranges, at least as high as 24V battery voltage, and maybe high as 48V.
Last I looked, their biggest model was rated for 10A.

73, Jim K9YC

On Sun,3/19/2017 12:15 PM, Paula Keezer wrote:
> I have seen some misconceptions about MPPT.  The best reason to use MPPT is
> so that you can put multiple solar panels in series and you will not exceed
> the maximum input voltage of the controller.  The controller will continue
> to charge even in partial sunlight just as long as the input voltage exceeds
> the battery charge voltage (in this case 14.xx volts).  Since solar panels
> in series ADD voltage, with two solar panels you get a  24 volts (well, more
> like 32 volts in full sunlight) and when those panels are in shade, the
> individual panels may drop down below 12 volts but the sum of the two will
> be much higher than the required charging voltage.


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[Dean L]

Harry
To be reminded, one must have first been informed.     :)
I thought you were dealing with a higher current system. Sorry to be
presumptuous. My K2 would tx approx 10 min +/- on a 2.9ah ( drawn to 50%
discharge).

Guess we should have asked.

73
Dean K2WW
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