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Re: Small Site Solar Equipment Advice Needed
To: CRTech <crtech@crtech.org>
Subject: Re: Small Site Solar Equipment Advice Needed
From: Dave Obergoenner <daveobergoenner@gmail.com>
Date: Mon, 23 Jul 2018 11:02:18 -0500
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These folks have great prices on good gear (Missouri Wind and Solar)...

Sounds like you just need a 240 watt panel, a small charge controller, and a small inverter (pure sine-wave preferred). 

I realize you only need a little more than 10 watts, but I'd design the system with a good deal of overhead.  Remember two important things...The sun is NOT shining at night, and Cloudy days don't produce much solar energy.  Also, if your panel is covered in snow for a few days, you won't get much out of it.  Place the panel where you can get to it easily to rake-off the snow with a push-broom if need-be.

For batteries, I'd suggest a pair of 6 volt Trojan T105 batteries in series.  They are considered "golf-cart" batteries, and are designed for continuous cycling.  Get those locally so you don't have to pay shipping.  That pair would likely run your stuff for days with no sun at all.

Just my 2 cents worth,
Dave O.

On Sun, Jul 22, 2018 at 9:35 PM, Mark Croom <markc@newmail.kinshipradio.org> wrote:
Hi All,

I have a situation where I might need to power a Ubiquiti hop site with some type of solar/battery/inverter setup.

It's just two PoE radios, rated at 5.5W power consumption each (120V into PoE adapter).

I'm looking for something I can attach to the wood pole that supports the antennas, that is, to fit in a small cabinet that will attach to the pole. I'm OK with assembling this from parts rather than some kind of turn-key kit but the simplicity of a kit would be great because I'll be doing this as part of a big project and there's a lot on the plate while the project is in process.

I'd be interested in hearing from folks who might have done something like this -- it's much lower power requirement than a solar powered transmitter or translator site but it needs to be reliable (STL). I envision a deep cycle battery connected to the charger/inverter, or other battery technology that makes sense.

The panel would have a nice south exposure maybe fifteen feet up the pole, but the cabinet would be sheltered much of the day as it would go below the roof level of a very nearby adjacent building. That means not much roasting in the summer but we do get to -25F in the winter so if anybody has some real-world experience with battery technology for this I'd be grateful for the input.

Trenching power to this location would be very costly so I think doing our own solar might just be a great self-contained alternative.

Thanks for any real-world experience you can share.


Mark W. Croom
Riverfront Communications, LLC
Yankton, SD

References: Small Site Solar Equipment Advice Needed
(Mark Croom <markc@newmail.kinshipradio.org>, 23 Jul 2018 02:35:25 -0000)
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