Solar system: how can I simplify this diagram

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Old 07-21-19, 11:45 AM
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Solar system: how can I simplify this diagram

I have eight (12v, 3W 0.25A) lights, two (12v 5Amp) fans, four (12v 1.5W 0.125A) strip lights, one (12v, 2.7Amp) Water pump, two individual cigarette outlets and one cigarette outlet connected with two usb outlets.

I know for sure the fans have to be connected with 16AWG wire, the lights can be connected with 18AWG the same with the outlets not so sure about the strip lights. The water pump I believe could go with a 16 or 17AWG. And the outlets at 18AWG would be okay.

Can anyone confirm the wire numbers. Would it be okay If I run everything at 16AWG?

Should I run all the light wires to the bus bar and then just to the fuse box or it is good to go through the fuse box?

Thank you very much,

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Last edited by PJmax; 07-21-19 at 09:17 PM. Reason: resized diagram
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Old 07-21-19, 09:30 PM
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Welcome to the forums.

Could you use all #16 wiring....... sure..... but why ?
Why not use a mix of #16 and #18 as needed.

The lighting is all good on #18.
The two fans draw a combined 10A. That should be at least #16.
There is no #17 so I'd put the pump on #16.
Each cigarette lighter on its own #16.

I'm not sure I like the fridge on a cigarette lighter plug. Some come that way but for continuous duty.... a hardwired connection is better. Depends on what the fridge draws.

I see you have some type of connection block. The negatives just need to get a good ground connection. The positives should be fused. I would highly recommend a fuse block like in the link. It's a 10 fuse unit.

10 Fuse ATC fuseblock

Put the pump on a 10A fuse.
The strip lights can be combined on one 5A fuse.
The two fans on a 15A fuse.
Each cigarette lighter on its own 10A fuse.
All the little lights can be combined and on a 10A fuse.
 
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Old 07-23-19, 03:22 PM
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Thank you very much.
Not sure how to combine the strip lights since I put them in different switches.
Here's my final diagram with all the wire sizes and fuses. I still don't know what fuse size to use before the fuse box. This is the link to the diagram.

https://docs.google.com/drawings/d/1...it?usp=sharing

Fridge: 3.3Amps 12V 40W (Connected to outlet 18AWG)
Each Vent 12V 5amp (16gauge wire) Outlet 12V 10Amp (18AWG)
8lights 12V 3W 0.25A (18AWG)
4 strip lights 12V 1.5W 0.125A (18AWG)
Water pump 12V 2.7A (18AWG)

Fuses:
Fridge outlet: 10 Amp
2 Vents: 15Amp
Outlet: 20Amp
4 lights + switch: 2Amp
2 lights + dim: 1Amp
2 lights + switch: 1 Amp
1 strip light + switch: 1 Amp
2 strip light+ switch: 1 Amp
Pump: 10Amp
 
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Old 07-23-19, 05:24 PM
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Solar system DC wiring

Good morning!
My boyfriend and I are working on converting a box truck to our tiny house and I am in charge of the electricity. I have been watching videos and learning most of the electric stuff from internet. I believe I am on the final phase of my diagram so I can go get the wires and the fuses/breakers. but I was wondering if you can have a quick look at my diagram and tell me I won’t blow myself up. Or if there’s something to improve. (Still not sure what amp breaker to put between battery and fuse box).

https://docs.google.com/drawings/d/1...it?usp=sharing


Fridge: 3.3Amps 12V 40W (Connected to outlet 18AWG)
Each Vent 12V 5amp (16gauge wire) Outlet 12V 10Amp (18AWG)
8lights 12V 3W 0.25A (18AWG)
4 strip lights 12V 1.5W 0.125A (18AWG)
Water pump 12V 2.7A (18AWG)

Fuses:
Fridge outlet: 10 Amp
2 Vents: 15Amp
Outlet: 20Amp
4 lights + switch: 2Amp
2 lights + dim: 1Amp
2 lights + switch: 1 Amp
1 strip light + switch: 1 Amp
2 strip light+ switch: 1 Amp
Pump: 10Amp

Thank you very much!!!
 

Last edited by PJmax; 07-24-19 at 10:16 PM. Reason: tried to add pic from link (too intricate)
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Old 07-24-19, 04:42 AM
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Often fusing is done to protect the wiring from overload. In that case the fuse/breaker size is chosen based on the wire size and not the load. Since most of your 12VDC wiring is 18 ga it would all be protected by the same capacity fuse. If trying to protect the device connected at the end then you can use lower rated fuses.

One thing that stands out is your "outlet" which also has 18 ga wiring and using a 20 amp fuse. Then you are using 16 ga wire on your vents with a 15 amp fuse. Why fuse the higher capacity wire with a smaller fuse?

Also, if using a cigarette plug on your fridge many of those plugs have a fuse internally. That would allow you to size your primary fuse for the wire size then let the fuse in the plug be sized to protect the fridge.
 
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Old 07-24-19, 10:08 PM
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Threads combined. Not sure why a new one was started.

You can use a 40A or 50A fuse to protect the fuse distribution block.
Instead of putting each light on its own fuse.... combine some on one fuse.
 
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