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Why does a 433AH suck on solar?

Posted: Mon Jul 12, 2010 10:29 pm
by desertadmin
SO I love the 433AHs but..... If they receive an over-voltage of close to 28+v then they shutoff. So here in the South West where the sun can be very brutal our array can push close to 30v which has caused our 433AH and 493AH to shutoff. The solution to this situation is a physical hard unplug to restart our MT. We discovered this to be a problem so at one site we had to regulate the voltage so that it is no more than 28 volts. This costs us a whole new piece of equipment called an RMS with some additional resistors to lower the over voltage issue. While..... Our older 532 and 333 boards seem to be a lot more tolerant to over voltage issues and under voltage issues.

Any other suggestions to help regulate would be greatly appreciated. Can we expect that all new products of the Routerboard will come with this deficiency? Or is their plans to reintroduce the voltage regulator that seems to be missing from the newer Routerboards.

-DesertAdmin

Re: Why does a 433AH suck on solar?

Posted: Mon Jul 12, 2010 10:45 pm
by jcem
you can buy a dc/dc converter for less than $20

RGDS

Re: Why does a 433AH suck on solar?

Posted: Mon Jul 12, 2010 11:20 pm
by desertadmin
What model or brand do you suggest?

Thanks

-Sincerely,
DesertAdmin

Re: Why does a 433AH suck on solar?

Posted: Mon Jul 12, 2010 11:25 pm
by SurferTim
A few 1N4001 diodes in series between the supply and the router should help. That should drop about 0.6v (600mv) per diode. Three in series should drop about 2v.

Mine doesn't suck at all. I use 12 volt equipment.

Re: Why does a 433AH suck on solar?

Posted: Mon Jul 12, 2010 11:40 pm
by jcem
I got the smallest of these....

http://nordicpower.se/pdf/SDC-5205_5208_5212_5220.pdf

Not sure were you buy those in the States, but maybe RS?

You can buy them online at elfa.se(69-055-13) - economy shipping maybe ≈ $20

RDGS

Re: Why does a 433AH suck on solar?

Posted: Mon Jul 12, 2010 11:44 pm
by desertadmin
Yeah but why is it that we have to add a diode in order for it to function as an older 532 board.?

-Sincerely,
DesertAdmin

Re: Why does a 433AH suck on solar?

Posted: Tue Jul 13, 2010 2:22 am
by charliebrown
It's good S.O.P to regulate the voltage going into your gear, just because the older boards could handle voltage's outside their normal range doesnt mean it is good for them

Re: Why does a 433AH suck on solar?

Posted: Tue Jul 13, 2010 1:39 pm
by SurferTim
My RB433ah works as well as the RB333 it replaced. I power them with 15v maximum and 10.5v minimum. Doesn't require a diode.

Just out of curiosity, why did you choose a 24v solar system over a 12v system?

Re: Why does a 433AH suck on solar?

Posted: Wed Jul 21, 2010 10:09 pm
by rebel2234
My RB433ah works as well as the RB333 it replaced. I power them with 15v maximum and 10.5v minimum. Doesn't require a diode.

Just out of curiosity, why did you choose a 24v solar system over a 12v system?

My thoughts exactally! We use 12v everywhere and a voltage stepper like this one (http://www.virtualvillage.com/12v-to-24 ... 2-013.html) which works very well. We usually set the output voltage to 18V (almost everything will work with that) and it dosent matter what the input voltage is, it will still output 18V (tested it with a 5v-2A power supply and a 12v battery output voltage remained the same). Not sure if the stepper will step down IE 24V IN and 12V out.

Re: Why does a 433AH suck on solar?

Posted: Tue Jul 27, 2010 3:08 pm
by winagain
why not just install a voltage regulator, you can get in 12v,24v 36v and 48v

I had a similar problem in Botswana, where my repeater stations that are on solar were going above 30v especially at around 11:45-13:40.

Once I installed a voltage regulator I have had no further problems.

You can get units that are meant for outdoors in sun and rain.

Re: Why does a 433AH suck on solar?

Posted: Thu Jul 29, 2010 10:18 am
by RK
It's good S.O.P to regulate the voltage going into your gear, just because the older boards could handle voltage's outside their normal range doesnt mean it is good for them
+1

DC-DC converters are cheap. Look on eBay.