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WH1081 on AC

For discussion of DIY weather equipment - sensors, accessories, improvements to existing kit etc
zecrich
Posts: 37
Joined: Tue Aug 16, 2011 9:42 am
Weather Station: WH1081
Operating System: Windows 7
Location: Southchurch, Essex

WH1081 on AC

Postby zecrich » Tue Apr 23, 2013 6:37 pm

I am thinking of changing the base to run on AC and the sensor on solar.

So questions
Its 4.5v for the base but will an output of 500ma be OK?
How can I adapt the sensor to run with solar? Would it be rechargeable batteries and
and solar and what specs if someone could help

Thanks

AllyCat
Posts: 1041
Joined: Sat Feb 26, 2011 1:58 pm
Weather Station: Fine Offset 1080/1 & 3080
Operating System: Windows XP SP3
Location: SE London

Re: WH1081 on AC

Postby AllyCat » Wed Apr 24, 2013 2:09 am

Hi,

The Console (base unit) runs from the USB power anyway and only requires about 50mA. If you don't run it from a PC 24/7 then you could use any mains powered USB adapter, but it would be better to stll put 3 x AA Alkaline cells in the Console as a (power fail) backup.

The best solution for the external unit is probably to use a pair of non-rechargeable Lithium AA cells, which should last for many years (even at very low temperatures).

But if you insist on using solar power, then the best technology is probably one AA (also known as 14500) 3.2 volt Lithium-Iron Phosphate (LiFePO4) cell plus one "dummy" (short-circuit) cell in the second position. These cells are often sold as "solar garden light" replacements, e.g. from Maplin. You would need a solar panel rated at about 6 volts, or it may be possible to "cannibalise" a solar garden light if you understand the principles of the electronics, which (despite their simple appearance) usually incorporate a low voltage PV panel and a voltage step-up converter.

Cheers, Alan.


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