I’ve calculated that I need 70mm2 cables to connect the battery to the Multi RS inverter. Using the Lynx distributer is not an option any more due to the cable thickness, correct? Which fuse system/mechanism/device would be best te use? I was planning to use the Victron DC battery switch, but that one doesn’t have a fuse. Should I maybe better select a switch with a automatice fuse switch? Looking forward to suggestions what best to use. Thanks.
Hi Rene,
I’m using 70mm² cables for connecting my batteries and Multiplus IIs. They are all connected to a Lynx distributer and they fit perfectly. Also used the Victron DC Battery switches. They were more of a challenge: the cable lugs are to bulky to fit in the housing case, making it impossible to fit the back cover. I had to add a mounting plate with extra room for the lugs to mount them to the wall.
Not the best picture, but here is my installation (not completed at the time picture was taken):
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Excellent, this is good feedback and good news. I will go for the Lynx distributer as well than. Thanks. Nice setup by the way.
I have 95mm2 cable ready to fit into a Lynx distributor.
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Another question to your setup, for my learning purposes. Do I see it correctly you have the Victron DC switch on the negative connection? Why is this the case? I would design it to add the switch on the plus cable, but I’m still a beginner, so still missing a lot of knowledge.
Very good observation. Regrettably this is (as far as I know) the only thing I did not built to spec. You are correct: the DC switch should switch positive side of DC.
Ok, thanks for the openness, appreciated.
No problem. Since you can not see it in my attached picture, an extra tip for consideration: make sure all cabling from Lynx to each battery are of equal (total) length and all cabling from Lynx to each Multi RS are of equal (total) length. This eliminates voltage differences between batteries and voltage differences between Multi RS.
Excellent again, thanks for the tip. I was aware of this and planning to make the cables all indeed the same length. This includes I assume the DC switch in the setup. Or you make the cable lets say, 3 meter each, cut the one of the cables to add the DC switch in between. Or should you add 10cm extra length to the cable without the DC switch?
As far as I know, there is no need to have the positive and negative cable of exact equal length. For example: You can have a negative lead of 2 meters and a positive lead of 3 meters to connect a battery to the Lynx. Just make sure you connect all batteries with the same cable config. So that the voltage drop (due to given current) is the same for each battery and the absolute voltage of all batteries are equal at the Lynx at given current.
edit: typo
Aha, understood. So the plus cable from each battery to the Lynx needs to be the same length as well as the min cable from each battery to the Lynx needs to be the same length but it is not required that plus and min cable are identical in length. Clear.
Which 70mm2 are you using? Purchase where?
I don’t know if it’s allowed to post this. @Moderators: please remove post if not allowed.
I bought cabling here.
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Having the same cable length (think resistance) is most likely never the case, I mean. With a BMS and Victron smart shunt on the negative wire , a fuse and battery switch on the positive wire. Haha. Good luck.
FYI lithiumaccus.nl also has some nice double insulated battery cables.