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Author Topic: seasonal tilting ground mount  (Read 4061 times)
eabadger
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« Reply #45 on: May 01, 2017, 12:43:47 PM »

i would love to say they nicked my design, but it would appear not, wonder if they have any proof of this 40% improvement ?
they do appear just to use same bits i got, the saftey fencing stuff and standard tube + unistrut.
did you see how it is moved?

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
Mike123
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« Reply #46 on: May 02, 2017, 03:53:45 PM »

Could I ask how deep (and width, etc) you did the concrete for the solar mount? Considering building something similar in a sheltered position here

Thanks
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eabadger
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« Reply #47 on: May 02, 2017, 05:55:25 PM »

deep, about 1.5m below ground level, maybe overkill, but luckily have a mini digger.
we had a good blow yesterday and all was fine, in fact when you got close to the array the wind wasnt present, i assume like lift effect on a plane wing?

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
Mike123
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« Reply #48 on: May 03, 2017, 04:02:55 PM »

Wow 1.5m. That is deep, but I don't blame you. Me thinks I will need to have a re-think.
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skyewright
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« Reply #49 on: May 03, 2017, 05:54:09 PM »

Wow 1.5m. That is deep, but I don't blame you. Me thinks I will need to have a re-think.
What some people do to 'boost' the footprint of a base is to drive rebar into the sides of the hole, leaving a good bit of bar to be embedded in the concrete. Usually driven in at an angle (if you had a hole big enough to drive it horizontally, you'd probably have a hole that was big enough not to need, if you see what I mean?). The effectiveness will of course depend on the nature of  the ground!

Just a thought...
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Regards
David
3.91kWp PV  (17 x Moser Baer 230 and Aurora PVI-3.6-OUTD-S-UK), slope 40, WSW, Lat 57 9' (Isle of Skye)
eabadger
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« Reply #50 on: May 03, 2017, 07:14:48 PM »

the front to back size is about 1.5m as well, gives me space to bolt the supports to, i also cross braced within the concrete create a t at about 750mm, sort of peg it in place.
but when we had the blow the other day, it was as if the wind avoided the array.

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
eabadger
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« Reply #51 on: July 04, 2017, 10:13:12 AM »

quick update, panels now fitted back on roof of the "solar shed" these are at fixed angle not not sure what it is, but best i could achieve, shed now totally waterproof and exto skeletal frame installed to mount the pv.
so 3 banks of approximately 1550w two tilting, the tilting ones are as i track the suns height making more power, i wont bother next year with the most flat position because it was so short a time where it was ideal, we have hit daily input of 30kw on a few days, we try and use excess power when batteries floating to get most out of pv, we now have electric kettle and air source heat pump for dhw.
i am concerned that our battery pack may be failing, one negative terminal was getting hot, i swapped lead and still the same when under high charge or big load, since a long equalization charge not so bad, so maybe hope yet, did have a bit of an incident when putting lead on, batteries had been gassing and when lead put on spark caused the hydrogen went bang! very frightening, but the cell that went bang has never been better, full sg.
so be careful is the message, very careful i was lucky very lucky and very spooked afterwards.

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
Scruff
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« Reply #52 on: July 11, 2017, 11:19:05 AM »





Mee-Meep!
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eabadger
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« Reply #53 on: July 11, 2017, 11:45:14 AM »

that pretty much sums it up! very frightening, the cell smoked for ages, but like i say never been better! the terminal has now calmed down i assume was sulphated.
sun gone in for a few days and big storms but still holding our own, wish i had done it before this year, would have saved loads in red diesel costs.

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
rogeriko
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« Reply #54 on: July 11, 2017, 11:01:48 PM »

Terminals getting hot means either a bad connection (easily curable) or as I have discovered the lead seems to get eaten away exactly at the surface of the acid. This leaves a little thin bit of lead which heats up when passing high current and is not cooled by the acid because it is just above the surface. I have found this several times on large 2v cells
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eabadger
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« Reply #55 on: July 15, 2017, 09:20:34 AM »

have found the issue, appears on my exide batteries the actual threaded bit is like a bronze piece interference fitted in the lead, the thing must have been loose, with me now drawing bigger "lumps" of power the problem rapidly got worse, until yesterday everything went off with low batt alarm followed by meters showing 35v!! was a sad time for all, took a while to get cell out of pack then could not get allen screw out of bronze part, had to knock a too small spanner on it, after screw out i could see the bronze part was waggling around like a loose tooth and heat are ark marks clear to eye, managed to form the lead back tight without resorting to soldering it, did read up about it but given last hydrogen "pop" wasnt keen.
the bronze part is about 18mm and lead bellow about 30mm i also cut a 22mm piece of copper pipe and made it proud of the bronze part, when lead was screwed down it press down on the lead giving a better contact, longterm looking at one new cell as these seem fine.
on tenterhooks as mo.
anyone cut one of these open to see how they are fitted? maybe some sort of expansion nutsert? with copper pipe on seemed to allow correct tightening force on screw without moving.

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
going green
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« Reply #56 on: July 15, 2017, 05:09:55 PM »

Steve you are making me jealous of your tilting porn so wish we had the space to do the same
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eabadger
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« Reply #57 on: July 16, 2017, 09:37:22 AM »

like biff said, wish i had done it ages ago, other than issue with battery this week all has been well.
space here is much better than our old haunt of Nottinghamshire, when we first bought out here we wanted as much land as possible and were advised against it, with a strange comment at the time about land being cheaper than carpet.
a fair few years on we see what they meant, you can get poor land here for a a meter or serviced building plots for 12 msq, never seen a carpet shop.
i think the groundmount of panels is the best way if you have land, only time will tell if tilting it makes that a worthwhile difference, but diy building didnt increase costs that much over static, only real difference were the connectors that came to about 130.
our biggest issue is scaffold pole doesnt exist here, or at least we could not find any.


fitting on ground far easier than on the solar she roof.




steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
todthedog
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« Reply #58 on: July 17, 2017, 09:12:30 PM »

Not that it will make you any happier we never found any either!!!
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eabadger
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« Reply #59 on: July 18, 2017, 09:56:59 AM »

odd thing is, there is a local dealer for the connectors i used!!! 4 x the price though.
thinking about it, you never see scaffolding here, what do they use instead?
weather warm and humid today with lightening and possible hail forecast, getting ready to de branch the internet box.

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
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