Sig Energy Topic

Author	Message
wiseguy Guru Joined: 21/06/2018 Location: Australia Posts: 1294	Posted: 10:16pm 01 May 2026         analog8484 said   Your understanding is correct. Here in the US, the smart meters have a measurement period as short as ~200ms.  This is one reason why it's important to have an interconnection agreement that allows transient export events up to 2 seconds and still be qualified as zero export and not get charged/penalized.  The only way to avoid getting detected by the smart meters is to guarantee no net export per measurement period.  AFAIK, no consumer grade zero export hybrid inverters can respond to transient exports that fast.  Typically, the response time is >1s but <2s to meet the interconnection agreement requirement for zero export.  Also, it seems many of the cheap hybrid inverters don't even have accurate enough current sensing to reliably detect small (<100W) transient exports.  Some people have resorted to running small constant loads but it's far from a perfect solution as sudden PV input power jumps (e.g. clouds edging) or sudden big load shutoffs (e.g. central A/C thermostat cycle off) can still cause transient exports.  The only practical way for most to guarantee no detection appears to be galvanic isolation. Thanks for the response and information. Luckily there are plenty of energy suppliers here who so far do not charge for export to the grid 24/7 so continuous feed in is not an issue. As I was trying to sleep I came up with a plan that could work. Lets not try to keep the import/export at zero that is a dumb plan for my situation. Lets aim for 0.5 or 1 or 10W continuous grid feed. Heck what is 160WH loss for the 16 odd hours when we dont usually export? That way even if we end up accumulating 10H or 100H of import from big glitches it essentially solves my problem. So I'll email Sig and see if we can redesign their "zero". Edited 2026-05-02 08:18 by wiseguy