24volt rv system design questions

[mike450136]

i am using 4 charge controllers and 4 solar panels. what connection method should i go with to connect the output of the charge controllers to the battery? i was hoping to avoid the lynx distributor. but i dont know if fuses are completely needed for this section of wire. they are certainly not required going from the solar panel to mppt for my specific setup.

second question:
other than the breakers being made in china, do you think they look fine for this setup?

breakers are for solar disconnect. not for tripping purposes:

https://www.platt.com/p/0052014/abb/miniature-circuit-breaker-2-pole/abbsu202mk25

third question :
would a Victron cebro gx be beneficial to get the 4 Victron mppts to play nice?





products that will be used:

solar panel 355 watt

JA Solar JAM72S01-355/PR (355W) Solar Panel

four victron 75 | 15 mppt controllers:

https://www.amazon.com/Victron-SmartSolar-Charge-Controller-Bluetooth/dp/B075NQQRPD

battery

New LEV60F 3.2v 74ah Lifepo4 Power Cells

If you buy 6 they will ship in the original case. Otherwise we will repackage them safely into a custom box. They are Lithium Energy Japan cells model LEV60F. Nominal voltage is 3.2v. They are 74ah cells. These cells are overstock and were originally intended for luxury vehicle 12v lifepo4...

batteryhookup.com

pv wire

12 AWG PV Cable - PV-Cables, Inc.

Price per foot

pv-cables.com

 

[sunshine_eggo]

i am using 4 charge controllers and 4 solar panels. what connection method should i go with to connect the output of the charge controllers to the battery? i was hoping to avoid the lynx distributor. but i dont know if fuses are completely needed for this section of wire. they are certainly not required going from the solar panel to mppt for my specific setup.

Connecting 4 devices to a battery is usually impractical, so you might want a bus bar - lots are cheaper than a Lynx.

second question:
other than the breakers being made in china, do you think they look fine for this setup?

breakers are for solar disconnect. not for tripping purposes:

https://www.platt.com/p/0052014/abb/miniature-circuit-breaker-2-pole/abbsu202mk25

Yes.

third question :
would a Victron cebro gx be beneficial to get the 4 Victron mppts to play nice?

No, but a cerbo gets you VRM, which is awesome.

The MPPT will play fine by themselves. Put them in a VE.Smart network together, and they will coordinate charge phases with each other.


I've been tempted by those cells. Make sure that you do not accept any that are low voltage or outliers.

EDIT: AND get a good BMS

AND consider a Victron Smartshunt to feed the MPPT accurate voltage and actual charge current data.

 

[chrisski]

i am using 4 charge controllers and 4 solar panels. what connection method should i go with to connect the output of the charge controllers to the battery

I got two 8 position busbars. Three studs are for SCCs, another the inverter, another stud for the charger, another stud for the dc to dc converter, and another stud for a 24 VDC Line.