On Wed, 5 Feb 2025 at 18:24, Roger Munford via Hampshire
<hampshire@???> wrote:
>
> Thanks everybody for your kind and useful responses.
>
> The project involves two solar installations which are close to each
> other and as generators they are separate. However it appears that for
> monitoring purposes, (equipment manufactures advice) it would be better
> to have the two systems integrated hence the last minute call for a
> wireless link. It could have been incorporated into the system whilst it
> was being built but that didn't happen. I have passed on the excellent
> suggestion of a fibre link.
>
> In the distant past I did install a couple of wireless bridges across
> farmyards using normal domestic equipment costing in the order of £50
> plus antennae and they seemed to be OK. However for this job, I thought
> that I would try and find something industrial standard . It seems that
> the sort of equipment found on Amazon although cheap appears to be
> adequate although I think a well made, rugged system is required here.
>
> A few years a go was lucky enough to be involved in a project in Africa
> and we were advised to use "Teltonika" equipment for comms and it looked
> the part, aluminium case, rail mounted. What I meant by robust. It has
> been working for 3 years without failing.
>
> My friend has ordered something Chinese from Amazon just to get going
> but chances are he will come back to it later.
>
Hi,
Considering the Wifi option.
An off the shelf wifi equipment can probably reach 100M line-of-sight
without needing any special antenna.
180M might need a more directional antenna.
There are also OFCOM license considerations to consider. Limit's TX
power outdoors etc. if you don't want to need a license.
Another aspect of RF point-to-point links is that RF does not travel
in a single straight line like a laser does.
You need to pay attention to something called the "Frensel Zone"
Here is a youtube video to explain it:
https://www.youtube.com/watch?v=b7ey2upDhRw
So, in summary, I don't think you need to go with anything too expensive.
You could also maybe use Lora or similar to link the two solar arrays,
that will be cheaper.
Kind Regards
James
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