Green Building Forum - I boost keeps sending power to the grid Tue, 19 Dec 2023 06:24:57 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300550#Comment_300550 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300550#Comment_300550 Thu, 02 Mar 2023 09:05:24 +0000 jhsigma I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300551#Comment_300551 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300551#Comment_300551 Thu, 02 Mar 2023 09:28:58 +0000 djh
If it is a significant amount, then either it's a faulty unit or there's some other factor you haven't yet told us.]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300556#Comment_300556 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300556#Comment_300556 Thu, 02 Mar 2023 12:00:21 +0000 jhsigma Could that be a setting on the Zappi do you think ?]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300560#Comment_300560 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300560#Comment_300560 Thu, 02 Mar 2023 13:05:53 +0000 revor I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300612#Comment_300612 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300612#Comment_300612 Sun, 05 Mar 2023 18:45:53 +0000 jamesingram 'STORAGE OFFSETT'
default is 100W, you can increase that to 500W in 50W increments. its probably set at that to avoid accidental import for the element or perhaps its just not considered viable to have the unit constantly switching for less.
As an additional load comes on and off it appear on the meters the iboost builds and drops off slowly to available power rather than switching in and out instantly. Its constantly variable output unless over 3kW.
Zappi probably has and export threshold as well.
Set them to suit your desired result.
Also make sure the CT clamps are at least 10cm apart]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300614#Comment_300614 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300614#Comment_300614 Sun, 05 Mar 2023 19:59:09 +0000 djh Posted By: jhsigmaThe original intention was to dump into the thermal store until it reached 80 deg then the balance to the car (74kw battery )and then if anything left back to the grid ,but when I plug the car in it all goes to the carI don't know anything about the particular devices in question and any possible clever interlinks they might have, but I think in general it matters which way round the devices are connected to the incoming mains. i.e. the order of connection along the wire. IIRC the furthest from the meter will get first dabs on any available power and the second one closer to the meter and grid will only divert anything left over after the furthest has had its fill. I'm sure somebody will correct me if I've got it the wrong way around!]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300758#Comment_300758 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300758#Comment_300758 Wed, 15 Mar 2023 16:41:05 +0000 CWatters
I wonder what the tolerance is on the meter?]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300777#Comment_300777 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300777#Comment_300777 Fri, 17 Mar 2023 09:55:27 +0000 Gareth J
I can't see how the order of the CT clamps on the cable makes any odds, preference is determined by export threshold. The distance between them can make a difference though, had to space two of mine ~20cm apart to stop them "fighting" each other.]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300779#Comment_300779 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300779#Comment_300779 Fri, 17 Mar 2023 11:15:24 +0000 djh Posted By: Gareth JI can't see how the order of the CT clamps on the cable makes any oddsBecause the furthest from the meter sees the whole generation, whilst the one nearer the meter sees the generation net of whatever the first has diverted. (Assuming the generation itself is further away from the meter than either CT.]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300781#Comment_300781 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300781#Comment_300781 Fri, 17 Mar 2023 19:36:09 +0000 Gareth J Posted By: djh
Posted By: Gareth JI can't see how the order of the CT clamps on the cable makes any odds
Because the furthest from the meter sees the whole generation, whilst the one nearer the meter sees the generation net of whatever the first has diverted. (Assuming the generation itself is further away from the meter than either CT.

Not unless there are wiring (and therefore load) spurs between the two CTs. Current in at one end of a wire is current out at the other, less losses. Unless something is very wrong. Both CTs on a continuous wire will measure the same current.

The logic seems obvious to me but I am happy to physically test it with the pair of CTs I have to see which one "wins" if you like. When I installed it, I paid zero attention to which one was where. Just that they were far enough apart and the right way around.]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300789#Comment_300789 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300789#Comment_300789 Sat, 18 Mar 2023 11:05:23 +0000 djh I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300795#Comment_300795 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300795#Comment_300795 Sat, 18 Mar 2023 14:42:59 +0000 Gareth J Posted By: djhSorry, I assume that the CTs are connected adjacent to the diverted loads, so exactly the diverted load is what is between the CTs.

Ah, ok. Yes can organise things physically logically that way but I think it's more common to put all CTs on the meter tails and let the differing export thresholds organise priority.]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300797#Comment_300797 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300797#Comment_300797 Sat, 18 Mar 2023 16:15:59 +0000 djh I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300799#Comment_300799 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300799#Comment_300799 Sat, 18 Mar 2023 17:10:50 +0000 Gareth J Posted By: djhGiven that my meter tails are about 30 m from my DHW diverter I doubt I would do that.

If your solar is wired into the meter Henley blocks, as many (most?) will be, you might not have a lot of options! Plenty of diverter widgets have wireless sender's now. I've got one leap frogging about 35m. In extremis, I have even run a length of swa back to a remote phase where generation inverters are, to feed, via a hard wired diverter, into an indoor immersion/storage heater. But I get that that's going to be unusual.]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300801#Comment_300801 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300801#Comment_300801 Sat, 18 Mar 2023 17:40:07 +0000 djh Posted By: Gareth J
Posted By: djhGiven that my meter tails are about 30 m from my DHW diverter I doubt I would do that.
If your solar is wired into the meter Henley blocks, as many (most?) will be, you might not have a lot of options! Plenty of diverter widgets have wireless sender's now. I've got one leap frogging about 35m. In extremis, I have even run a length of swa back to a remote phase where generation inverters are, to feed, via a hard wired diverter, into an indoor immersion/storage heater. But I get that that's going to be unusual.My meter is about 30 m from my DHW diverter and its associated CT. My diverter is near the solar connection to my mains system, at the main CUs where it is attached. i.e. the diverter and CT are in one place, the meter is in another. As is my EV charger, but that is currently dumb. Why would solar be wired into an [import] meter rather than through a CU?]]> I boost keeps sending power to the grid http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300802#Comment_300802 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17764&Focus=300802#Comment_300802 Sat, 18 Mar 2023 18:28:44 +0000 Gareth J Posted By: djh. Why would solar be wired into an [import] meter rather than through a CU?

That's how my MCS array was done. Has it's own breaker and direct supply from Henley blocks. Same with our MCS WT. I can't tell you why or of it's mandatory/common/uncommon though. The CU is right next to them though so logistically, just as easy. I can imagine that, with yours being some distance away it made sense to wire to the CU. Indeed I have done that for my own, non MCS system.]]>