Hi,
I have very little knowledge of electronics but these diagram has been very helpful to represent it in a simpler way.
I hope that somebody could give me a recommendation on my design, fuse rate and wire size. I’m open to any recommendations and adjustments.
Thanks to everyone
Wire Location |
Max Length (meters) |
Wire, mm2 |
Fuse/Breaker Rating (Amp) |
Solar Panels to MPPT |
5 |
10 - 16 ??? |
20 |
MPPT to (+) Bus Bar |
0.5 |
6 |
40 |
(+) Bus Bar to Second Battery |
0.5 |
25 |
100 |
(+) Bus Bar to DC Fuse Box |
0.5 |
25 |
100 |
(+) Bus Bar to Alternator |
0.5 |
25 |
100 |
(+) Bus Bar to Orion DC-DC |
0.5 |
10 ? |
45 ? |
Orion to main car Battery |
6.5 |
35 ? |
60 |
(+) Bus Bar to Inverter |
0.5 |
35 |
150 |
Inverter to loads 220 |
5 |
2.5 |
- |
Components Used:
1 x 370 W, 24 v, Mono Solar Panels by Jinko ( Link )
Smart Solar 100|30 MPPT by Victron ( link )
Orion tr DC-DC 30A Isolated by Victron ( link )
4 x REPT 3.2 280 AH Lifepo4 Battery cells ( link )
Smart BMS 4S cells 12V 120A (link)
300 A Shunt by Mictuning ( link + link shunt )
1000 W, 12V, Pure Sine Inverter ( link )
Main switch 300A ( link )
Auto midi Fuses (50A to 100A) (Link)
I am living in Europe and I am using this table to guide me in the current withstand in amperes of the cables
Doubts:
1- I am going to use the Inverter to power 2 laptops and a 50L fridge (which opens three times a day). Is it necessary to increase the 25mm2 cables and the 100A fuses?
2- In the MPPT Smart Solar manual, it indicates that it is optional to connect the ground (chassis), is it recommended?
3- Can I connect the negatives (-) of both batteries through the chassis ? Instead of two negative cables from the Orion DC-DC to each battery.
4- Do the negatives (-) have to be connected to the chassis in a lifepo4 system?
5- Should I fuse the positive (+) cable of the main battery to Orion tr?
Diagram attached in PDF
Planol imitacio angles..pdf
Diagram in Imagur
https://imgur.com/hn0At5C
PS: i got the diagram from https://diysolarforum.com/threads/what-do-you-think-of-our-diy-wiring-diagram-did-we-get-the-wire-fuse-ratings-right.20224/