yesterday, my EP800 battery suddenly dropped below 20%, down to 3%. in 10 mins. It’s in self-consumption mode, which should prevent it from dropping below 20%. Is it a red flag to the controlling system or bad batteries? The whole system only 1 year old.
Have you ever performed a battery calibration?
If not, it’s quite possible that the displayed 20% is no longer accurate and could actually be much lower…
After a calibration, your BMS should recalculate the SOC values and display them correctly.
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P.S.: The 20% SOC low protection is, of course, only valid for your current SOC low value; if you’ve set a different value, the 20% is no longer accurate…
Unfortunately, the “Grid” diagram isn’t visible in your graph. It’s possible that your home is already connected to the grid, but the battery level is still dropping because it isn’t being charged—or isn’t allowed to be charged.
Thanks for the info!
if you refer to the battery maintenance under advanced settings, I will give a try. I thought the system should do it routinely without human.
20% is SOC is the default threshold, I didn’t change.
There’s a good reason why this doesn’t happen automatically, without user interaction.
Calibration requires a complete cycle of charging, discharging, and recharging: charge to 100% (if not already full), discharge to 0% (the EP600 may completely shut down during this process and need to be restarted manually), and then recharge to 100%.
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Based on my 8x B500s, which total nearly 40 kWh, I can’t just feed that into the grid and then automatically draw another 40 kWh from the grid on the side to get back to 100%.
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I do this either in the middle of winter, when I have to charge using grid power anyway, or on a beautiful sunny summer day when I can fully recharge the batteries with PV power, ideally in a single day…
can you confirm if the maintenance option is the calibration that you said? I launched a maintenance last night and it finished successfully. But today, I see the SOC drop to 3% again. To be safe, I changed the working model from self-consumption to Custom, and set as 20%-21%. Will see if this fix the issue.
Btw, you said you have 8 B500s. Are you using parallel mode of two EP inverters?
You’re right, I have two EP600s in parallel mode, which is why I have 8x B500s.
The app looks a little different for me in [Working Mode]; I don’t have a “Custom Mode,” which might be due to the different EP Models.
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Yes, the battery maintenance option starts the BMS calibration.
thanks! I have EP800. maybe the UI is a little different.
Is your parallel system running stable? I am considering to get another ep800 and setup a parallel to power my central AC (5kw). But not sure if this is reliable. couldn’t find any real case review online.
Yes, my system is running smoothly and satisfactorily. However, I fear that connecting two EP units in parallel is a discontinued feature from BLUETTI. All recent enquiries about expanding an EP600 with a second unit to boost power are now simply met with the advice to buy the EP2000 straight away…
I fear BLUETTI will no longer be promoting parallel connection.
If I were you, I’d contact support directly – not here on the forum, but via the online shop.
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As things stand today, I’d also buy the EP2000 rather than two EP600s. But it’s like everything else in life: no sooner have you bought the latest system and finally got it home than a newer and even better one comes out the very next day… and if I buy the EP2000 tomorrow, there’ll be a better system next year…
one unit is definitely more reliable than two parallel ones. I don’t see ep2000 is sold in U.S. market. Probably I will just add another independent system.