Info for skype meeting tonight

[Roy Emmerich]

Hey Manfred et al,

Mast Work:
This is the kind of ladder I want to buy for working up the mast:

http://tinyurl.com/2vbwr2r

I'm considering an even simpler setup by just tying the ladder up there with ropes instead of cutting rungs out and other construction work. That way the ladder can be used for other things afterwards.

Cable:
I haven't had a chance to get to CL Bergmann (http://www.cl-bergmann.de/) yet but I will do so soon. On page 11 of the Rutland 913 manual it suggests using 4mm² cable for a run of up to 30m (I will get Uta to verify this distance). I did a quick search online and found a price for 100m of 2 core 2.5mm² cable:

http://tinyurl.com/37ry4wq

Now this is for indoors use but gives an idea of how much this stuff costs per metre. According to the link above it amounts to 0.75 Euro/m. Let's assume 1.5 Euro/m for what we want (UV protected, 4mm² cable), that will come to 1.5x30m (assuming the distance is 30m of course) = 45 Euro total for the cable. Assume 20% for contingencies and we come to about 55 Euro for the cable.

Controllers:
Seems like the HRDx is no more. Will have to get either the HRSi (£72.95) or the HRDi (£149.95). Will have to see why such a big price difference between the two models.

Speak tonight at 8:30pm via Skype for those who are keen.

Roy

[Manfred Amoureux]

Hi.

There are huge variations in the prices of cables according not only to the diameter, but also the type (suitable for outdoor and / or mechanical fatigue). We should double check.

Beside this, I am pretty sure of the distance from the mast to the window of the house. I had measured it.

Regarding the DC switches, I think we should not worry too much about the insulation (it's low voltage). However, the currents may be very high : up to 700W in 12 volts, this makes nearly 60 A. The fuse for the batteries is rated at 70A anyway.

So basically, we should be able to use off-the-shelf as long as they are rated for the proper current. 

It is easy for the PV panels : there is less than 110W / maybe 5 A, so an AC switch rated for 1kW should do the job.

Same for the wind turbines.

But they are not those which were bothering us as they are already connected to the charge controllers, which already can act as switches.

However, DC switches for the battery and the inverter should be rated for 70A (the fuse's rating) so that would be an AC switch rated at 16 kW !

2010/6/14 Roy Emmerich <roy.em...@gmail.com>

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[Manfred Amoureux]

PS : http://www.moeller.net/en/products_solutions/solutions/erneuerbare_energien/photovoltaik/dc-lasttrennschalter.jsp

2010/6/14 Manfred Amoureux <manfred....@gmail.com>