Has DC System strange effect

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daveb asked Oct 8, '21

Has DC System strange effect

I have Easyplus, Bluesolar MPPT, Cerbo GX. I have the "Has DC System" enabled in Easyplus and noticed that the charge output of MPPT appears to be going to the Easyplus in VRM and it shows battery idle. When I disable "Has DC System" (which I have via a 12 way fuse box in my automotive system) the MPPT shows charge to battery and that the battery is in charging mode in VRM. So what is causing the "Has DC System" to direct the charge to Easyplus with that setting and is that what is actually happening? See screenshot attached.

Further confusion: The remote console does show the current flowing from the MPPT to the battery when "Has DC System" enabled in Easyplus but on the battery shows no charge.

And when "Has DC System" switched off the current flow is to battery and battery shows the incoming wattage.

Whats going on here?

EasyPlus

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Alexandra ♦ commented · Oct 09, 2021 at 05:15 AM

@daveb

Are there ways for the gx to measure any of the two systems? The battery monitoring of the easy is an approximation of what it thinks is going there, unless you have a shunt that talks to the gx.

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daveb Alexandra ♦ commented · Oct 09, 2021 at 03:41 PM

I do have a BMV 712 in system but having problems with that too which I'll post about in due course. I currently don't have any load on the DC system other than the Easyplus itself so as I understand it the battery monitor in Easy will be accurate for whats being taken out on that part of system.

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klim8skeptic ♦ daveb commented · Oct 09, 2021 at 06:10 PM

In remote console change the battery monitor to the BMV.

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daveb klim8skeptic ♦ commented · Oct 10, 2021 at 05:00 PM

I have a problem with my BMV 712 or perhaps my wiring so do not get any useful readings from it. The only loads on the system are those of the Easyplus running a 240v refrigerator in AES mode so what shown by the Easyplus battery monitor will be true. Which Monitor set in remote console was not my question.

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klim8skeptic ♦ daveb commented · Oct 11, 2021 at 10:48 AM

Perhaps you should rectify your problem with the BVM??

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daveb answered · Oct 28, 2021 at 12:27 PM

The shunt was faulty and I have now replaced with a smart shunt and everything is working as it should. Thanks to all who responded.

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Modifications Space

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Answer 1 · 2021-10-10T06:46:27Z

Paul B answered · Oct 10, 2021 at 06:46 AM

As kim suggest change this setting to show the BMV unit. as this unit then measures ALL the DC power having it selected as the mutliplus means that it ONLY monitors the amps in and out of the Multiplus and thus does not know anything about the other loads and or changing items

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daveb commented · Oct 10, 2021 at 04:54 PM

My BMV 712 has a problem in that it reads 100% SOC permanently and shows no Ah drawn or any other readings. Yes I have checked it is the correct way around and theres no loads off the battery side of the shunt other than the Daly BMS thats with my 4s 280Ah Battery. Theres no loads on my DC system (other than Easyplus)so the Easyplus Battery Monitor is reading the SOC for consumption by the easyplus and its loads (A 240v fridge). Maybe I need to put the shunt before the BMS?

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