Would appreciate some comments and recommendations for 70mm2 cable type for 3x 6.5kV MP II, RS450 and 2x 300A LifePo batteries. I am getting conflicting recommendations from different installers.
All cables should be run in a cable duct with very short runs max 1 meter to Lynx 1000A distribution fused both on battery and MP II and RS 450 solar side of Lynx BMS and about 1.5 meters to the two batteries on separate cables from Lynx distribution,.
Thanks @M_Lange Would that be available in 70mm2 ? Double insulated by any chance? My search did not come up with such a version? If not double insulated, is running this in ducts with short usage upwards 200A @48V nominal ok for you? No issues?
Have you used that with good results in your 3-phase Victron installs that I see you have done? In the same duct?
No heat issues at maybe upwards 200A peaks @48V nominal for short usage? The rating should be fine, just looking for real world usage and best procedure.
For DC i like to use the second type H01N2-D but with untinned copper, for example from Lapp Cables. Im not quite sure about the exact insulation material, its rubbery, maybe it also is neoprene.
If you need to use single or double insulation should be given by your electrical code.
For example, in low voltage applications (most of our installs are PELV, up to 50VAC or 120VDC) i can use single insulated wires, and you may be as well since theres various ENs that govern this.
However, i also need to keep a distance to cables carrying 230/400V. So for example routing both types in the same cable duct would not be allowed. Otherwise also the low-voltage conductor needs to be double isolated.
Regulations here do not demand double insulation, but I like to go the extra mile on safety if it adds a security layer.
The H01N2-D you cite is rubber and single layer.
Our 70mm2 install is for up to maybe 57VDC and typically high usage probably at 150A-175A when using stove or water heater
and occasionally maybe a little more. But mostly a lot less.
Thanks. Space and handling is ok with me. I guess I just want max safety for my budget and the length and cost of the cabling is not really an issue here.…and if the russians blow up the grid here (not really a joke these days unfortunately)
I want to try to stay afloat as best I can without melting cables on sun, wind and sunflower oil in the generator
Your concern is not the cable, but the junction between cable and the battery or inverter, fusebox.., a un-torcked bolt can be serious danger. Because at 200A the much higher resistance cause massive heat build up, I have seen a red hot wire connector, amps was only 17A when the connector was replaced, fuses don’t protect this danger.
