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Old 05-22-2016, 12:16 AM   #1
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Battery Monitor versus Inverter Install Questions

I'm installing a Blue Sky IPN Pro battery monitor in my 2013 FC 30 Bunk.

The current factory-installed WFCO 600W inverter is connected directly to the battery (i.e., the battery has two sets of leads--plus the power jack lead--coming off from it; one set for main DC house power and one set for the inverter).

If I connect the shunt off the battery negative and don't relocate the inverter's negative connection, I don't believe I will have an accurate indication of amp-hours used by the inverter, correct? It's essentially a parallel path for electron flow and will bypass the shunt and therefore my battery meter, right?

Should I rewire both the inverter's positive and negative or just the negative (connect the inverter negative to the load side of the shunt)?

If I rewire both positive and negative from inverter, where should I connect the positive? Remove positive from battery and connect downstream of the type II thermal breaker buss and upstream of the battery disconnect solenoid or downstream of the solenoid? Can the solenoid handle the draw from the inverter?

I'm leaning towards simply relocating the negative lead to the load-side of the shunt and leaving the positive lead connected to the battery (along with my main DC house positive lead).

Conceivably, the way it's currently wired from the factory the battery store/use switch would kill the inverter, right?

I guess I'm wondering why the factory did it this way?!?!

Thanks!
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Old 05-22-2016, 05:50 PM   #2
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Typical inverter wiring when involving a shunt connects ALL negative leads to the shunt. The positive loads stay where they are with the inverter positive directly attached to the battery positive terminal.

I would NOT connect the inverter positive thru any other device other than the appropriately rated fuse located in that line.

Inverter positive cables are to be dedicated direct-connect lines.


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Old 05-23-2016, 10:13 AM   #3
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Thanks Lew! As long as I have things torn apart now, I guess it's a good time to upgrade the battery cables from the factory 6AWG too...
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Old 05-24-2016, 12:06 AM   #4
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Quote:
Originally Posted by Searun View Post
Thanks Lew! As long as I have things torn apart now, I guess it's a good time to upgrade the battery cables from the factory 6AWG too...
Depending on the length of the inverter cables, I would use 2AWG if they are over 5' and 4AWG if under. Remember that the length is that of BOTH cables, meaning that if the inverter is located 5' from the battery terminals, your circuit length is 10 feet.
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Old 05-24-2016, 02:34 PM   #5
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My buddy has one of those in his SOB. If (when!) the battery charge goes down below some threshold, that gadget shuts off everything, including the charger, or the circuit from the charger, so you can't recharge the batteries...
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