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inhabor avatar image
inhabor asked

Why my MPPT is showing ESS instead of Bulk in the middle of a sunny day with the batteries at 60% charge?

MPPT ControllersESS
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JohnC avatar image
JohnC answered ·

Hi. This is likely to be because the mppt is not deciding it's own charge state, but feeding from another device which is telling it what to do. Ie. it doesn't know whether it's in Bulk or not, but is being decided by an external controller (eg CCGX or Battery BMS).

A recent firmware update altered that notification from "ESS" to "External Control", because it was confusing users who didn't have ESS installed.

Is this explanation relevant?, as we don't know your setup..

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inhabor avatar image inhabor commented ·

How can I fix this? Can I disable the ESS? The system is in a vehicle. It has a multiplus compact, MPPT and a CCGX

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JohnC avatar image JohnC ♦ inhabor commented ·

In a mobile application you shouldn't be using ESS anyway. That's clearly stated in the ESS documentation.

So yes, disable/remove it, and see what happens. Maybe you have other 'special' stuff too, so I can't guarantee a fix. But that's a good start..

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inhabor avatar image inhabor JohnC ♦ commented ·

I'm sorry for bothering so much, but I'm kind of new to this stuff. Any chance that you can explain how to disable the ESS please?

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