Main Battery Disconnect Install

[jd1923]

Thought about this some more and given my design philosophy is always "Minimum Viable Product" I realized I could just add a 300A breaker with internal cut-off switch.

I rarely disconnect anyway since we do not put our Oliver into winter storage. I will have the Victron SmartShunt on the ground and this breaker on red B+ cable. No mounting board, no extra wires or buses, just a little VHB under these two devices, one sitting on each battery. I will start a new Forum Topic soon on my LI and MP2 upgrade. Thanks for sharing!

Amazon.com: GLOSO Circuit Breaker E93 for Marine RV Truck Extended Surface Mount 3/8" Diagonal Stud Waterproof IP67 Hi-Amp (300A) : Automotive

[Teaney Hull 292]

On 7/9/2024 at 6:54 AM, katanapilot said:

A Google search of this site will lead you to several posts of how owners have installed these switches.  Here is a picture of how I did mine during the lithium battery upgrade (which was shamelessly copied from Geronimo John).  Tie down straps added after the picture was taken. 

Would you send me the parts you used? Also not sure how your wires are connected. Can you also send a pic of the back of the wiring. Thanks and hope that is not too much of a hassle. My 2 new 280ah Lithiums are arriving soon. Gary Hull 292, 

[Teaney Hull 292]

On 7/20/2024 at 1:59 PM, jd1923 said:

Thought about this some more and given my design philosophy is always "Minimum Viable Product" I realized I could just add a 300A breaker with internal cut-off switch.

I rarely disconnect anyway since we do not put our Oliver into winter storage. I will have the Victron SmartShunt on the ground and this breaker on red B+ cable. No mounting board, no extra wires or buses, just a little VHB under these two devices, one sitting on each battery. I will start a new Forum Topic soon on my LI and MP2 upgrade. Thanks for sharing!

Amazon.com: GLOSO Circuit Breaker E93 for Marine RV Truck Extended Surface Mount 3/8" Diagonal Stud Waterproof IP67 Hi-Amp (300A) : Automotive

I just ordered the 300A breaker for my install based on your suggestion. Thanks for adding the link. Gary Hull 292

[jd1923]

5 minutes ago, Teaney Hull 292 said:

I just ordered the 300A breaker for my install based on your suggestion. Thanks for adding the link. Gary Hull 292

Gary, I did purchase this and later went without it, returned it to Amazon. First, when I got my hands on it, the breaker did not appear to be quality level for 4/0 battery cables.

Then when I removed our battery cables, I found that OTT had an ANL fuse holder and 250A fuse well hidden up above inside the pantry wall (see pic). If yours has this, it's all you need. To find it, follow your positive/red 4/0 cable out of the battery bay and it should be right there on the interior side.

Fuses are also better protection, since they protect against an overload in both directions. Breakers are directional with source and load sides. But then fuses do not include ON/OFF switches.

I went without a cut-off switch and twice since when upgrading other electrical components, I merely remove the battery ground with a 1/2" wrench. If you want a cut-off switch I would do what @tallmandan did in his post. If fact your upgrade could follow his good example: