Battery Interlink terminals

[Keithwill]

Bought 4 terminals to interlink 2 130ah batteries to have independant supply for 3000w inverter. The inverter cables are 35mm and the interlink cables are 17mm doubled up. The terminals are a bit lightweight (chinese) but all I could find on ebay etc with enough capacity for the 35mm plus 2 x 17mm bare cables. I am worried if the actual contact area between battery terminal post and these multifit terminals is good enough. I haven't fitted yet should I try and see if they get warm whilst using or look elsewhere for a safer alternative.

 

[Lenny HB]

No way would I use those on a 3000 watt inverter, horrible cheap probably steel construction.
You need to fit good quality solid brass battery terminals then use a couple of busbars like these.

https://www.amazon.co.uk/dp/B0B7RLB2VC/?tag=mhf04-21

 

[Two on Tour]

Bought 4 terminals to interlink 2 130ah batteries to have independant supply for 3000w inverter. The inverter cables are 35mm and the interlink cables are 17mm doubled up. The terminals are a bit lightweight (chinese) but all I could find on ebay etc with enough capacity for the 35mm plus 2 x 17mm bare cables. I am worried if the actual contact area between battery terminal post and these multifit terminals is good enough. I haven't fitted yet should I try and see if they get warm whilst using or look elsewhere for a safer alternative.



View attachment 878837

I would used a busbar rated for the amperage and cable your batteries to the busbar and the take your loads from the busbar.
I do this for both my positives and negatives.

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Suppliers of high quality electrical parts, components & accessories for campervans, motorhomes, boats & off-grid applications.

www.12voltplanet.co.uk

 

[Keithwill]

Thanks for the suggestions. I have followed the diagram as in the pic. This allows for the charge and discharge to flow through all the batteries as recommended [ negative bat1to load and pos bat 3 to load ] The terminals on the batteries still have 2 or more 35mm cables to connect. A bus bar would be useful to connect multiple loads bu I have just 1-the Inverter. Other batteries and solar are running the electronic motorhome distribution as per standard m/home manufacturers design.
I have connected the inverter output direct to the 240v consumer unit switched via a 15a double pole isolator switch [Not in the diagram]to the consumer unit which has a double pole rcd and a rcd15amp. I cannot see where a busbar would help reduce the cabling to battery terminals without ignoring the "through flow" principal. I would like some advice on earthing, as the inverter is making a "loop while connected!

 

[Gromett]

I have a few of those and they are now in my bit box. I found them a bit scary as they wouldn't clamp down solidly enough for my liking.
If you do use them you may need to rip the plastic bit off to allow them to seat low enough on the terminal to clamp solidly.

For multi battery setups I now use a busbar with cables that are the same length connecting to the battery.

When choosing a busbar make sure that you choose one that has a high enough current rating per terminal.
For example some will sell a 250A busbar. But it is only rated at 50A per stud (5 studs). The 250A is misleading.