Virtual Battery

A battery charge Epilykos works out itself, for inverters that cannot read the battery directly.

Metrics

Metric roles, combined metrics and the list of every reading.

Forecast and weather

Solar forecasts from Solcast or Open-Meteo, and the weather.

Settings → Virtual Battery keeps its own count of the battery's charge. It used to be the battery estimate, a card on the Metrics page.

Some inverters have no link to the battery's BMS, so the battery percentage they show is only a guess based on voltage. If yours is one of them, Epilykos can keep a better count itself: it tracks the current flowing in and out of the battery through every inverter, and resets the charge to 100% each time the battery is full.

Switch on Count the battery's charge, then fill in:

Field	What to enter
Type	The battery chemistry (LiFePO4 unless you choose otherwise).
System voltage	12, 24 or 48 V. Epilykos tells you what your inverters report.
Capacity (Ah)	The whole bank, at the system voltage: two 200 Ah packs in parallel make 400 Ah.
Charge efficiency	How much of the charge actually stays in the battery, from 0.5 to 1.
Cells in series	Leave it empty to use the usual number for your voltage, or set it for other packs, such as 15 for some 48 V LiFePO4 batteries.
Battery current (+ while charging)	The metric with the battery current, positive while charging.
Battery voltage	The metric with the battery voltage. With more than one inverter, list them all, separated by commas, and they're averaged.

Recognising a full battery: set Full at or above (V), With the current settled within (A) (meaning charging has tapered off to this or less) and For (minutes). When all three are true at once, the charge is reset to 100%.

Resetting at low voltage (optional): if the voltage drops to Low voltage at or below (V) while the load is light, the charge is set to Means a charge of (%).

You can also set the charge by hand. When the estimate first starts, it takes its starting point from the battery voltage. Switch on Use it as Battery % to have the estimate fill the battery SOC role in place of your inverter's own figure.