Mixed export house

Every device class at once, with the export permissions deliberately unequal: one battery may feed the grid and the other may not. Nothing here appears for the first time — this is the case that shows the rules of the lower rungs still hold when they all apply together.

What this case shows

• A device that cannot export is excluded from the export mix, even while discharging.
• Standby draw is routed through the provenance allocation, not by gross share.
• Two dischargers with different levelized costs price the mix between them.

Each snapshot below is one set of readings on this wiring, drawn as a flow chart — how to read it.

Export, non-exporting battery

Mixed export house · snapshot 01

bat2 discharges but may not feed the grid, so the export mix excludes it.

Reading	W	Of gross	Share	Made of
Gross power	1200 W	1		pv1 800 W · bat1 200 W · bat2 200 W
Grid import	0 W	0		nothing drawn from the grid
Grid export	600 W	1/2		pv1 480 W · bat1 120 W
PV production	800 W	2/3		pv1 800 W · pv2 0 W
Charging power	0 W	0		no battery charging
Discharging power	400 W	1/3		bat1 200 W · bat2 200 W
Standby power	0 W	0		no standby draw
Self-consumption	600 W	1/2		pv1 320 W · bat1 80 W · bat2 200 W
Metering imbalanceok	0 W	0		readings reconcile exactly
Home base load	200 W	1/6		unmetered remainder of consumption

Idle: pv2 · 0 WRibbon widths are watts in every view. Hover, focus or tap a ribbon to see the sensor behind it.

Export with standby

Mixed export house · snapshot 02

pv2 in standby while the house exports; standby competes in the allocation.

Reading	W	Of gross	Share	Made of
Gross power	1200 W	1		pv1 800 W · bat1 200 W · bat2 200 W
Grid import	0 W	0		nothing drawn from the grid
Grid export	600 W	1/2		pv1 480 W · bat1 120 W
PV production	800 W	2/3		pv1 800 W
Charging power	0 W	0		no battery charging
Discharging power	400 W	1/3		bat1 200 W · bat2 200 W
Standby power	50 W	1/24		pv2 50 W
Self-consumption	550 W	11/24		pv1 293.3 W · bat1 73.3 W · bat2 183.3 W
Metering imbalanceok	0 W	0		readings reconcile exactly
Home base load	150 W	1/8		unmetered remainder of consumption

Ribbon widths are watts in every view. Hover, focus or tap a ribbon to see the sensor behind it.

Discharge, dynamic prices

Mixed export house · snapshot 03

Both batteries discharging; the mix they charged on is in the past.

Reading	W	Of gross	Share	Made of
Gross power	800 W	1		bat1 400 W · bat2 400 W
Grid import	0 W	0		nothing drawn from the grid
Grid export	300 W	3/8		bat1 300 W
PV production	0 W	0		pv1 0 W
Charging power	0 W	0		no battery charging
Discharging power	800 W	1		bat1 400 W · bat2 400 W
Standby power	50 W	1/16		pv2 50 W
Self-consumption	450 W	9/16		bat1 90 W · bat2 360 W
Metering imbalanceok	0 W	0		readings reconcile exactly
Home base load	50 W	1/16		unmetered remainder of consumption

Idle: pv1 · 0 WRibbon widths are watts in every view. Hover, focus or tap a ribbon to see the sensor behind it.

Why this case exists

Every device class at once, and nothing here for the first time. That is deliberate: this rung is a net rather than a lesson. Each rule below it was pinned in the smallest wiring that could express it, and this case asks whether those rules still hold when they all apply to the same snapshot.

What it does add is disagreement between devices of the same kind. bat1 may feed the grid and bat2 may not, and they are otherwise alike — both discharging, both supplying the house. Watch bat2 in the first snapshot: it is contributing happily to consumption and contributes exactly zero to the export, because it is not allowed to. A model that computed the export mix from gross shares could not produce that.

The batteries also differ in what their storage costs, which is the only place in the corpus where a levelized price is a genuine blend of two different figures rather than a single source's number carried through.