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Author Topic: Ground Mount PV.  (Read 9857 times)
offthegridandy
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« Reply #30 on: January 11, 2019, 06:22:24 PM »

Hi Andy, no problem with piccies.

The trick with the metposts is to keep the in line.I use the 600mm long spike variety. Put in a couple of wooden posts and a string line outside the actuall site boundaries then line up the post positions along the tight string. I cut a short length of post say 450mm and put that in the metpost and some what tighten the clamp bolt to keep it rigid,.  Then I carefully drive in the post using a fencing mall to get a good even thump on the end of the wooden insert.  Go slow and steady to start and keep checking with a bubble for verticallity!


I used 150 X 32 treated decking board.  I've used for agricultural joinery for years and found it to be far better than ordinary treated softwood.  The grain is dense and if you select the boards are generally fairly knot free.  The preservative treatment is long lived but do recoat any cut ends.  As the structure is in the air steam I've had no trouble with rotting so far.

For reference we are up on the 300mtr contour line and on occasions do have real wind.  The metposts are far cheaper and more benign than more concrete.

Andy
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nowty
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« Reply #31 on: January 11, 2019, 07:14:23 PM »

I find that with metposts its important to NOT knock them in the ground too far.

In this way the wood stays a little off the ground and does not sit in sodden ground where they rot in about 3 years even if they are tantalised.

With several of mine rotted in 3 years, I dug out a few inches of soil and replaced with 20mm gravel around the metposts which aided to the drainage. The replaced wooded posts have been in 5 more years without a hint of rotting.
« Last Edit: January 11, 2019, 08:26:11 PM by nowty » Logged

10kW of PV installed and 50+ MWh generated.
Usable battery storage of 40+ kWh.
Hot Water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground Source Heatpump.
220,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
offthegridandy
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« Reply #32 on: January 11, 2019, 07:54:16 PM »

Agreed nowty,  that's why I use the 600mm spikes and leave 50mm or so above ground.
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8 KVA Lister TS2 Startamatic Genny
24 Volt 1000amp battery bank
Outback VFX3024
4.6 Kw PV array permanently ground mounted
Outback Flexmax 80
2 X Flexmax 30 PV CC
2.5 Kw wind turbine H Piggot design 4.5 Mtr Dia
12 Mtr free standing Tower.
u/floor heating from oil boiler cross linked to 12 Kw
andrewellis
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« Reply #33 on: January 13, 2019, 12:00:59 PM »

Thanks for all your advice.  I shall try and come up with a design which is tolerant of variable spacing on the metposts.  We do have the odd large rock in the ground which can rot up post installs.  We are a similar height to yourself Andy so it's good to know it has stood strong.
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