Maybe. 28VDC is the high end of the rating. I have seen at least one
433AH not startup at 27volts, but once it started it would run at 27.5.
If you are going above that it is possible you could be causing the
overvoltage protection to kick in. Assuming you are drawing about .5
amp on the board, you could put a 8 ohm 20watt resistor in series with
the power supply and drop 4 volts so the MT would see 24.
You would really want to measure the current to get the right resistor.
For those that want to do this but don't know the formulas
resistance = (voltage drop desired)/(measured current)
wattage = (power supply voltage) * (measured current)
The resistance needs to be close the the calculated valued.
The wattage rating of the resistor should be more than the calculated
value. Bigger won't hurt as the rating has to do with the amount of
heat the resistor can dissipate.
A better way would be a regulated 24VDC power supply that will accept
24-30VDC as input, but I don't even know if such a device exists.
On 9/18/2010 5:53 PM, Matt Larsen - Lists wrote:
Do the 433AH boards have a problem with high voltage? We have a
couple of solar sites that put out 28volts, and one has been locking
up. Could this be a problem with too much voltage?
Matt Larsen
vistabeam.com
On 9/15/2010 9:14 AM, Butch Evans wrote:
On Tue, 2010-07-20 at 18:00 -0500, Terri Kelley wrote:
Apparently the 433AH shortage continues, can't find them.
This keeps up and I will have to start using something else.
I should have them this week. http://store.wispgear.net/
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Owner
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Wireless Networking
Network Design, Installation and Administration
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