In-reply-to » Media Side view showing the staged height difference for batteries. Hope it will hold them up, the channel is only 3mm thick, each post holds 100Kg, the spans are 900mm and must hold 100Kg per channel, I suspect a little sagging in worse case?? Overall the batteries will place 800Kg unto this frame.

@lyse Probably you are right, tube steel posts used for homes do rust on the inside, but the most common oxidation is the outside, where the dew night and day temperatures react with the post going into the concrete. So there I paint them with zinc paint, and hydroseal (bitumen paint) before concreting the posts in place. Re stumping contractors do not do this, and the posts do not last.

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