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Will 30 AMP fuses work on 10 gauge wire?
#1
I have a 160 Watt solar panel, MPPT controller, LiFePO4 battery and 300 watt inverter.

Will 10 gauge wire and 30 AMP fuses work on all connections to protect the wiring?
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#2
Most ordinary automotive fuses are rated to 32 VDC so you should be safe with your 19-20 VDC open circuit voltage the panel is capable of. 
 10 gauge conductor is generally rated for 30 amps so you are protecting the wire with a 30 amp fuse. But  the wire or connectors could get pretty hot before blowing. A 15 amp breaker or fuse is often standard on the solar to charge controller wire. 20 amp may be easier to find and should work fine. Never go over 30 amp.
[-] The following 1 user says Thank You to Roadtripp for this post:
  • GimmyTree (09-11-2019)
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#3
You could go with 15-20 amp fuses on the DC input and DC output of the charge controller but the inverter should have a minimum 30 amp fuse. 10 gauge would likely work for the inverter DC input It might be better to use 8 gauge as it’s rated for 40 amps. With a 40 amp fuse. I prefer to use a 40 amp Sq. D type QO breaker. And 15 amp Sq. D type QO breakers on the input and output of the charge controller. It’s nice to be able to turn things on and off easily. And test voltages easily. But it does take a little bit of space.
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#4
Roadtrip, that is a 230v inverter I think which will make the wire sizes different.
Brian

2000 Roadtrek 200 Versatile "The Beast" (it has been tamed hopefully)  I feed it and it doesn't bite me.   Angel
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#5
I do not think that the output of the inverter has anything to do with the size of the wire providing the power as long as it is still a 12 volt bank providing the 300 watts of power. Change the bank to 24 or 48 volts and the the input cables can be smaller.
[-] The following 1 user says Thank You to justjim for this post:
  • GimmyTree (09-11-2019)
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#6
(09-10-2019, 08:15 PM)Roadtripp Wrote: Most ordinary automotive fuses are rated to 32 VDC so you should be safe with your 19-20 VDC open circuit voltage the panel is capable of. 
 10 gauge conductor is generally rated for 30 amps so you are protecting the wire with a 30 amp fuse. But  the wire or connectors could get pretty hot before blowing. A 15 amp breaker or fuse is often standard on the solar to charge controller wire. 20 amp may be easier to find and should work fine. Never go over 30 amp.

(09-10-2019, 08:24 PM)Roadtripp Wrote: You could go with 15-20 amp fuses on the DC input and DC output of the charge controller but the inverter should have a minimum 30 amp fuse. 10 gauge would likely work for the inverter DC input It might be better to use 8 gauge as it’s rated for 40 amps. With a 40 amp fuse. I prefer to use a 40 amp Sq. D type QO breaker. And 15 amp Sq. D type QO breakers on the input and output of the charge controller. It’s nice to be able to turn things on and off easily. And test voltages easily. But it does take a little bit of space.

OK buddy, I've decided on a 20 amp fuse for the solar feed and 30 amp fuses for the controller to battery, and battery to inverter?
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#7
Sounds good. Remember if you are using 10 gauge from the battery to the inverter keep the wire as short as possible. And keep the positive and negative wires as close to the same length as possible. 
 B and C. The AC side of the inverter is a completely different issue than topic of this thread. This is about the DC side.
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#8
I understand. With 230v output at 300 watts, wouldn't the draw on the dc side be more? Guess this is why my stuff is native 12v or runs from shore/generator.
Brian

2000 Roadtrek 200 Versatile "The Beast" (it has been tamed hopefully)  I feed it and it doesn't bite me.   Angel
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