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Solar + Batteries = import from grid
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<blockquote data-quote="hiddenhippo" data-source="post: 533395" data-attributes="member: 35089"><p>Thanks for the reply John. It makes sense that inverters might have step ranges, and unless the difference between load demand, battery and import happens to fall exactly on a step increment, there will be either a potential for draw on the grid, or export to it. Having spent a number of hours (probably) looking at why the import value from the grid fluctuates, and why sometimes it's zero but most times it's floating between a range, I suppose makes some sense, knowing what you've now said. Ignorantly I'd have assumed the inverter would have small increment ranges, but possibly not, or as you also noted, it needs to import to maintain synchronisation, but why the import value would range wildly in order to maintain sync, not so sure, unless it is again a factor of the "steps."</p><p></p><p>From this I could enable the export of energy back to the grid (which is currently configured as "no, don't do that") and see whether that makes any changes.</p><p></p><p>The import/export is sensed with a CT clamp; no adjustments to the original cable length. Just clipped onto the LIVE. In the image I provided you'll see a black and white cable pair in the blue circle I drew - these are the CT clamp cables. You think some shielding would possibly help - I guess they could "pick up noise" potentially, if too close to other cables - it does sit close to the mains neutral.</p></blockquote><p></p>
[QUOTE="hiddenhippo, post: 533395, member: 35089"] Thanks for the reply John. It makes sense that inverters might have step ranges, and unless the difference between load demand, battery and import happens to fall exactly on a step increment, there will be either a potential for draw on the grid, or export to it. Having spent a number of hours (probably) looking at why the import value from the grid fluctuates, and why sometimes it's zero but most times it's floating between a range, I suppose makes some sense, knowing what you've now said. Ignorantly I'd have assumed the inverter would have small increment ranges, but possibly not, or as you also noted, it needs to import to maintain synchronisation, but why the import value would range wildly in order to maintain sync, not so sure, unless it is again a factor of the "steps." From this I could enable the export of energy back to the grid (which is currently configured as "no, don't do that") and see whether that makes any changes. The import/export is sensed with a CT clamp; no adjustments to the original cable length. Just clipped onto the LIVE. In the image I provided you'll see a black and white cable pair in the blue circle I drew - these are the CT clamp cables. You think some shielding would possibly help - I guess they could "pick up noise" potentially, if too close to other cables - it does sit close to the mains neutral. [/QUOTE]
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Solar + Batteries = import from grid
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