Connect Smart charger direct to battery or through the BMS?

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tex260z asked Jul 8, '20

Connect Smart charger direct to battery or through the BMS?

Hi Guys,

Finally got the BMV-712 installed and updated, waiting on a temp sensor to arrive in the mail.

Now I have a question, as my van lives in a shed with no sunlight falling on the panels I need to use my Victron Smart battery charger to keep the batteries up to snuff now and then.

Considering I now have the BMV-712 my question is this:

Should I continue to connect the charger directly to the main battery positive and negative terminals? OR should I connect the negative to the third charging lead on the BMS (solar), that leg input is good for 50 amps by the way.

B.T.W. I was told by Victron that I could leave the charger permanently attached (storage mode) if required.

Cheers

Tex

charger

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Modifications Space

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Answer 1 · 2020-07-08T17:51:26Z

rickp answered · Jul 08, 2020 at 05:51 PM

I‘m no expert on the BMS, but I thought I should point out that the negative of the charger should be going to a point on the load side of the shunt. Nothing should be connected to the negative terminal of your battery pack except the line going to the shunt. Otherwise, the BMV712 will not see charging or draws from that device, and will show inaccurate information for the system.

I hope that is helpful to you!

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Answer 2 · 2020-07-10T07:35:25Z

Daniël Boekel (Victron Energy Staff) answered · Jul 10, 2020 at 07:35 AM

Hi @Tex260Z

What kind of batteries, what BMS?

can you provide a diagram of the system? pictures?

2

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tex260z commented · Jul 25, 2020 at 01:54 AM

200 Ah LiFePO4 prismatic.

Daly 3 port DG4S200A BMS (50 amp charging).

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200-ah-van-battery-bg8-s-balancer.jpg (1.9 MiB)

tex260z commented · Jul 28, 2020 at 06:56 AM

Ok, anybody want to check and verify my settings? Got the Network thing happening.

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bmv-712-1.png (200.8 KiB)

bmv-712-2.png (163.7 KiB)

bmv-712-relay.png (160.3 KiB)

bmv-712-soc-alarms.png (101.0 KiB)

charger-1.png (135.4 KiB)

charger-2.png (134.1 KiB)

mppt-7515-1.png (170.4 KiB)

bmv-mppt-network.png (200.3 KiB)

Answer 3 · 2020-07-25T01:49:50Z

tex260z answered · Jul 25, 2020 at 01:49 AM

So, just to be clear I am currently connection the Victron Smart charger to the B- Neg of the shunt, but you can see that the third leg C- of the BMS goes through the shunt negative as well, so by connecting directly to the B- (blue cable) side of the shunt I am bypassing the BMS, good idea or not? charger is just sitting in storage at the moment. I have to use the charger because the panels don't work at all in the shed.

shunt-bms-setup.jpg (1.2 MiB)

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Answer 4 · 2020-07-28T07:00:07Z

tex260z answered · Jul 28, 2020 at 07:00 AM

And now for my next question.

I believe I can control my Victron BD with the BMV-712, anybody like to give me a schematic and some settings?

Cheers

Tex

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