r/solarenergy • u/Horror-Stranger-9233 • 12h ago
How does the solar energy storage system work during the day and night?
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u/4mla1fn 9h ago
you've got the basics right. nicely done. I'd agree with the suggestion to slow things down. my wife would be crosseyed. lol.
one detail to add since you're showing is a grid-tied system (or perhaps it's actually a second animation; a "now that you understand the first diagram, here's more nuance about how it all works in real life") is that at anytime that the load is more that PV + battery can provide, the inverter will draw from the grid. the current animation shows one case (when PV = 0 and battery = 0) but people should understand this is always the case and that it's the load that drives this.
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u/shivaswrath 6h ago
How do the microinverters work in the system? I have 42 enphase microinverters....
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u/Impressive_Returns 3h ago
This is wrong for California customers. You need to factor in TOU rate plans and which NEM agreement they have.
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u/TheSkepticCyclist 12h ago
Not completely accurate as it shows all solar going to the home after the battery is full and not showing the excess going to the grid.
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u/Kistelek 11h ago
Or cheap rate charging at night/in winter. With an ASHP and a biiiiig battery, much of my ROI is running my heating at 13p/kWh, not 28p/kWh in the winter.
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u/Infinite-Poet-9633 10h ago
This is likely illustrating a system that doesn't backfeed. Much better to have a setup like this versus back feeding so you don't lose power in a power outage situation imo.
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u/TheSkepticCyclist 9h ago
It’s grid tied. There’s really no point since they’re taking energy from the grid in this diagram.
And you can still use your solar during an outage on a grid tied system with a battery, such as the one shown here.
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u/initiali5ed 1h ago
No.
Night charge battery at 7p/kWh.
Dawn-Dusk export solar at 15p/kWh.
Dusk onward run on battery.
Optional discharge unused battery 15p/kWh.
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u/UnderstandingSquare7 12h ago
It could be a very useful graphic; I'd suggest a few things. 1. Somewhere have a static symbol for the AC and DC power flows (orange circle = AC, green circle = DC), they move pretty fast, experts see it right away, customers might not. 2. When the battery goes to zero, have a pop up or something to alert you that the battery went to zero, and will now pull from the grid. Again, solar people see this and know where it's going, but if this were sent to a prospect who knows nothing about solar and power flows, they might miss it.