Battery->Fuse->SBMS120

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SailingJohn

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Apr 29, 2021, 6:13:57 PMApr 29
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I have not seen any wiring diagrams that have a fuse between the battery and the SBMS120 batt+ terminal.

I have seen the fuse in other designs.

Is it not needed? if so why? is the SBMS protected somehow?

Thx!

Joe Herring

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Apr 29, 2021, 10:31:44 PMApr 29
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The manual states that there should not be anything between the battery and the SBMS120 batt+ terminal. A disconnection while other connections are active would damage it. It should be the first connection made and never removed unless everything else has been disconnected first.
Read the manual closely as the wire connect and disconnect procedure is very important.

Alan Jones

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Apr 30, 2021, 10:16:40 AMApr 30
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Would it be Ok to add fuse and disconnect to the negative terminal of the battery?

Demosthien

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Apr 30, 2021, 10:30:23 AMApr 30
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This recent post springs to mind.

Dacian Todea

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Apr 30, 2021, 12:16:39 PMApr 30
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John,

The SBMS120 batt+ connection offers all the protection and if that is removed from any reason the SBMS120 will be damaged thus no fuse, switch or anything like that is allowed between Battery+ terminal and Batt+ connection on the SBMS120.
Also a fuse there is not needed as there is no possibility of internal short inside the SBMS120 since there is no power battery negative connected to the SBMS120 and the only way for current to flow is from PV1, PV2 or trough Load+ and you will have fuses or breakers on PV and also on Load+ so if there is a short on PV or Load+ than those fuses or circuit breakers will protect the Batt+ connection.

SailingJohn

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Apr 30, 2021, 4:50:30 PMApr 30
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Thanks every body!

Very helpful. 

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