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Old 04-23-2018, 11:37 AM   #1
Skoolie
 
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Join Date: Feb 2018
Location: Tennessee
Posts: 171
Year: 2004
Coachwork: Thomas
Chassis: 40' Saf-T-Liner MVP ER
Engine: CAT 3126 7.2L
Initial wiring layout - input needed

Ok I am finalizing my electrical setup and need some feedback

Main components

3ea 100watt 12VDC solar panels
40a MPPT charge controller
AIMS 2000watt pure sine inverter/charger

3 x 12 volt deep cycle flooded in parallel

125amp/150 amp peak isolator


Battery banks (bus and truck) are about 10-15í cable length apart from each other.

Solar panel combiner box is mounted 8í cable length from charge controller.

All other components (charge controller, inverter, fuse panels) are within 2í or less cable length from the house batteries.


Does this look about right for fuses and breakers?

Is the 2/0 gauge ground wire a good idea to ground the battery banks together with the isolator? Or is the chassis grounds all thatís required?




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Old 04-23-2018, 12:01 PM   #2
Bus Nut
 
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No relying on chassis for any high currents or expensive components.

Return wires should be the same gauge.

Between batts within one bank, same wire lengths for even, balanced resistance.

No need for CP between panels and SC unless maker specs it, but a single switch can be convenient.

Combiner / ACR between banks only closed while voltage high. Big ampacity if self-jumping through it.
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Old 04-23-2018, 12:03 PM   #3
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Master bank isolation switch between pos buss and batts.

Master fuse before that, ideally inches from the post.
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Old 04-23-2018, 12:09 PM   #4
Skoolie
 
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Join Date: Feb 2018
Location: Tennessee
Posts: 171
Year: 2004
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Chassis: 40' Saf-T-Liner MVP ER
Engine: CAT 3126 7.2L
Quote:
Originally Posted by john61ct View Post
Master bank isolation switch between pos buss and batts.

Master fuse before that, ideally inches from the post.




Yes I will be installing a master switch to isolate the positive at the bus battery terminal. 150 amp fuse will be literally the first item before the isolator between the banks
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Old 04-23-2018, 12:38 PM   #5
Skoolie
 
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Join Date: Feb 2018
Location: Tennessee
Posts: 171
Year: 2004
Coachwork: Thomas
Chassis: 40' Saf-T-Liner MVP ER
Engine: CAT 3126 7.2L
Initial wiring layout - input needed

Quote:
Originally Posted by john61ct View Post
Combiner / ACR between banks only closed while voltage high. Big ampacity if self-jumping through it.


The battery isolator is rated at 125 amp (150 amp peak) and I will installed a 150 amp fuse to prevent over-currents.

You are correct it will only allow charging of house batteries when the starting batteries are over 13.4 volts

Primarily I will use the alternator to help power 500-1kw for air conditioning while driving (depends on if I run both ACs or just the front while driving)

I have considered looking into a second alternator but not sure if itís possible or not (CAT 3126 FE)
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