ᐅ March 16, 2016: Start of Photovoltaic System Installation

These are the values from midnight last night until now.

Daily consumption: 2373 Wh

Grid consumption: 933 Wh

Self-supply: 1440 Wh

Battery discharge: 1057 Wh

Direct consumption: 383 Wh

Daily yield: 669 Wh

Self-consumption: 499 Wh

Battery charge: 116 Wh

Grid feed-in: 170 Wh

Autonomy rate: 61 %

Self-consumption rate: 75 %

Direct consumption rate: 57 %

b54 schrieb:
So would you say it is sufficient? For calculating self-consumption, etc.? I’m considering whether I need a logger for my photovoltaic system. It looks like it will probably be Winaico modules with a Fronius inverter.

What do you need a logger for?

The Fronius inverter, together with an additional S0 meter, can log enough data.

After exactly one week—mixed with sun, rain, snow, and hail—the situation looks quite interesting, although not representative. The difference between the battery charge and consumption also includes the initial charging of the completely empty battery at startup. In other words, the small battery has covered nearly 2 days’ worth of consumption just from one charge. In my system, the charging/discharging losses are only 3%, which is very low. Larger batteries typically have losses of about 6-8%.

Today, there was almost nothing: here in NRW, the weather has been dreadful... really dreadful. The battery is already “used up” (literally).

But personally, I am very satisfied with the data—I expected less...

PS: Below it says “Monthly consumption.” Of course, it is only exactly one week in this month, as the S0 logger has not been running any longer yet.

Best regards
Thorsten


Monthly consumption 67.45 kWh

Grid consumption 11.56 kWh

Self-consumption 55.89 kWh

Battery discharge 18.81 kWh

Direct consumption 37.08 kWh

Monthly generation 183.60 kWh

Self-consumption 58.29 kWh

Battery charge 21.21 kWh

Grid feed-in 125.31 kWh

Self-sufficiency rate 83 %

Self-consumption rate 32 %

Direct consumption rate 20 %

PPS: The main constant energy drain is the fridge from way back.
370 kWh per year (measured). Totally insane. Modern units use 70–90 kWh/year (measured).
You could maybe accept that—if the appliance still cooled properly. But it doesn’t anymore.

To put it into perspective: This old wannabe cooler consumes over 10% of my total annual electricity usage. Truly remarkable.

Decision made today: The old fridge is retiring.
It will soon be replaced by a newer A+++ rated fridge.

That’s not €60. The refrigerator would have to run for 10 years before buying a new one would be worthwhile.

My refrigerator is almost new and consumes just under 400 kWh per year—it’s expected since it needs to fit a lot inside 😀