carmencina
China
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Dear Community,
I am at the initial phase of my camper van conversion in China, in which I am planning to live and work together with my wife. Camper vans in China are not popular though they produce any kind of devices and gadgets one might search for this purpose.
I am not bad at DIY and woodwork but my electric knowledge is limited. I have been researching a lot in the last weeks to plan the wiring diagram that you see below. Despite my best efforts, I am sure there are mistakes that I cannot see and I hope some more expert eyes will help me avoid potential disasters!
![[image]](https://ibb.co/R72QvmR)
Image: ibb.co/R72QvmR (please copy and paste the link to see my diagram)
I would greatly appreciate any help or suggestions, especially in terms of cable and fuse sizes. What mistakes can you find? (The simple software I used didn’t have many icons, so the 12v fuse box looks like a normal breaker.)
Also, can I just use (magnetic) circuit breakers instead of fuses a bit everywhere (except the 12v box)? I also don’t understand why I should use one or another kind of breakers/fuses so I would simply go with the circuit breaker kind you see in the icons.
Thanks and safe travels!
* This post was
edited 06/02/23 08:42am by carmencina *
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carmencina
China
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I cannot post links or pictues, quite hard to explain a wiring diagram in words...
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CA Traveler
The Western States
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Read the forum on picture posting.
2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
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Bob
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BB_TX
McKinney, Texas
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Open this link and scroll down to easy photo posting to see how to show your pictures.
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Tom_M
New Hope, MN
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![[image]](https://i.ibb.co/Km6V0kT/Carmen.png)
Tom
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170ah Renogy LiFePo4 drop-in battery 400 watts solar
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CA Traveler
The Western States
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What is the reason for the DC-DC charger? Doesn't the alternator keep the chassis battery charged? Plus with the 2 batteries in parallel the voltage from solar should keep them both charged. But normally there will be an automatic connect of the 2 banks only when the engine is running, otherwise disconnected so that the chassis battery is always charged so that you can start and go.
Your solar has both 10 and 6 ga wires, should be the same. Wire size is based on the amps and series voltage. My panels for example are 9A and 36 Vmp with 62' of 10 ga wire and about 2% voltage loss. No need for the fuses on the MPPT input as the panels will not be damaged with a short. See the Imp panel spec. Use you panel specs, wire length and online wire calculator to determine voltage loss. 3% or less would be good. To be clear your panel wiring is not carrying 40A, but a lot less due to the higher voltage, MPPT converts the higher panel voltage power to lower voltage with more amps on the output. Posting panel specs will help.
The most critical wiring is from the MPPT output to the house battery and from the house battery to the inverter. Wires should be as short as possible and sized to handle the higher amp loads to minimize wiring voltage loss.
You show the red AC wire grounded which is OK if it's the neutral. In the US neither would be grounded and there would be a separate ground wire.
Hope this helps.
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TenOC
On the road -- Full time
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Is China shore voltage 220 Volts or 120 Volts?
Please give me enough troubles, uncertainty, problems, obstacles and STRESS so that I do not become arrogant, proud, and smug in my own abilities, and enough blessings and good times that I realize that someone else is in charge of my life.
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CA Traveler
The Western States
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I believe China is 220V 50Hz.
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carmencina
China
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Thanks for your contribution guys and please forgive my inexperience regarding image posting, will do that next time.
Quote:Is China shore voltage 220 Volts or 120 Volts?
It's 220v.
@CA Traveler: Thanks a lot, your answer is super helpful!
Quote:What is the reason for the DC-DC charger?
The chassis/starter battery is lead acid, the house battery is Lithium, so I read the safe only way to charge the second from the first is to use a DC-DC charger instead of relays so that it can keep a steady 14.6v charge.
Quote:Your solar has both 10 and 6 ga wires, should be the same.
You've hit a painful spot! I am building this van in the countryside with limited tools and shops, everthing must be ordered online and it takes days to arrive, so I asked the solan panel company to wire the panels for me to save time. I asked for 10 AWG cables but later I thought I had made a mistake because I only calculated half the wire lenght so, despite myself, I thought I had to rewire the "long sides" with 6 AWG cables. But from your reply I understand my first calculation (10 AWG) was probably correct, right?
Here are the panel specs of each panel (translated from Chinese, no instruction manuals, only a minimal label on the back):
Peak power: 300W
Open circuit voltage: 22.5V
Short circuit current: 16. 6A
Working voltage: 18V
Working current: 15.5A
Total length of the cables is 3+3=6m (20ft). As they are in a series, the max current going through them is 16.6A?
Quote:Wires should be as short as possible
From the MPPT to the battery there will be 40.8A and max 1ft distance, so I chose 6 AWG. From the inverter (1000w) to the battery I expect 100-120A max so 2 AWG should be enough but I wanted to cover for unexpected peaks up to 2000w if the CB fails so I chose 2/0 AWG. Useless?
Quote:the red AC wire grounded
My bad, I meant to connect the ground to the black cable in the diagram.
Thanks again!
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midnightsadie
ohio
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when you get done, only turn one item on at a time.
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