8kw hybrid battery cable
Good afternoon everyone, my 8kw hybrid should be delivered very soon! My question concerns the rated battery cables, in particular when attached to Fox LV5200 batteries. I made a post about these batteries some weeks ago, and it seems the batteries perform well with the inverter. The recommended cable size is bigger than the cables supplied with the fox batteries (4AWG) and the cable has a specific plug to attach to the batteries. I guess this question is aimed more towards the owners of LV5200s. Did you upgrade the cable to 35mm2? If you did, how did you get around losing the awkward plug on the original cables? My system has my whole house fed from the EPS, no smart meter so no selling to grid, 2 x batteries and 12 x 405w panels. I never charge or discharge with the grid, although i am connected to it. So, would the 25mm2 fox cable be ok for my set up? I also have a fused DC disconnect between batteries and inverter with 125A fuses. I can not work out whether i should change the rating of these. I really am out of my depth with solar so any advice or info will be greatly appreciated. Thank you.
The specification for this battery shows:
Max. continuous discharging current (A) 100
Max. continuous charging current (A) 100
I am surprised that the Fox LV5200 batteries have these specifications.
Most batteries of this capacity have a nominal charge/discharge rating of 50A.
If you want to get the 8kW from the the inverter you need a battery to be able to supply the inverter with approximately 150A. If these batteries are capable of 100A then 2 will do the trick.
This means that you would/should probably be looking at using a 35mm cable from the batteries to the inverter.
If you use a 25mm cable it is rated at approx 110A DC (depending on the brand of cable) which will support the inverter output to approx 5.5kW, but would be able to support higher currents for short periods.
As you only have 2 batteries a 25mm cable to parallel the batteries is fine.
These batteries use an unusual connector so I am not sure how you are supposed to parallel batteries.