Thanks for taking the time mamil to help out and a bit of a learning curve for me also ...  

bms shows battery currently at %100 checked with volt meter 12.6 so seems to be ok with current read out.

kgarnett wrote:

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Also make sure you have approriately sized cable between the battery -ve and the shunt as it will have to carry the full inverter current of 100A or more. The cable as can be seen in your earlier photo of the shunt is hard to see but may be undersized.

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Very good point, and I'd add that if you're not familiar with how to choose the correct size cable for any particular application, and the correct size and location of circuit protection (fuses), then I'd suggest you get an Auto sparky to sort it out for you - it's not worth saving the money one costs if it results in your motor home going up in flames!

I doubt it. They probably have calculated 15% loss at maximum load, as it won't happen often.

But that is the time you need every last nth% you can get your hands on.

Jaahn wrote:

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Mamil wrote:

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 Jaahn,

The Redarc Manager 30 comes with a shunt rated at 500 Amps so is capable of reading the draw of quite a large inverter. All that is required is that the inverter negative goes via the shunt (as with every other load) rather than being wired direct to the battery negative as I suspect it is with Goldenyears system, and then it will be accurately including the inverter draw in it's measurements.

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 Thanks Mamil 

I see the light now. For some reason Redarc chooses to call the shunt a 'battery sensor' not a 'current sensor' and indeed does not seem to list it separately or any specs for it either ?? But here is the diagram for wiring it in for full operation in the discussion topics. 

https://www.redarc.com.au/boards/topic/13254/wiring-in-a-shunt

Hmm having made my own shunts in times past for larger currents than needed here, I fail to see the reason for hiding this information or I am a bit thick possibly.  

Jaahn

 

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 Yeah, some of their terminology is a bit confusing, like they call the Manager 30 which is a mains charger, DC/DC charger, and Solar MPPT charger a "Battery Management System" which means something very different to everyone else 

Thats right peter  ...........

MAMIL         certainly knows his stuff and after he has done a few Redarc installs already ..i know who i would be listening to !!   u get the know alls etc that are never wrong then u get the ones that  are not up to speed like myself ...  but prepared to learn ..   great forum to visit and get ideas .

"I think the mis-description of the current shunt is a deliberate policy to reinforce 'the mystery' of their stuff."
My take on that is they are using a term that those with not much fine electronics knowledge understand.

"The term BMS has become universally used for something else rather than a complex expensive charger."
Redarc were using that terminology for their device way before lithium batteries came into vogue. I see no reason for Redarc to rename their devices. In most naming systems the older usage takes precedent. It is thus up to the latecomers to find a more suitable nomenclature for their devices. If we go back to before Redarc named their device, dual battery VSR style systems and diode isolators were referred to as battery management systems.

goldenyears wrote:

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guess some people a bit paranoid !  sorry  if you were offended !!!

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So I'm paranoid too....

Making splatteringly wide pejorative comments is never a good idea - if you have a criticism of an individual then direct it to them and be responsible for it or say nothing.

Seeing how you operate; this has been the last time I'll offer assistance to you.

I have had an inverter issue my fault, I brought a new just to run the fridge whilst on the move.

I have recently got rid of solar panels, extra battery and other assorted rubbish that is is associated with green power.

Any way we have had a few power outrages recently, which set me on the path of appeasement for SWMBO, what would I need  a decent inverter to run the AC, that means another battery or go lithium, solar controller, battery charger, solar panes, copious amounts of quality cable. Oh crap that's going to cost a couple of grand or more, bugger it I'll buy 3.2kva generator from kings for 500 bucks delivered.

So if you see a 25 ft Jayco and blue Ranger at a free camp with a bigs sign saying " this Grumpy old P@#$k will be using a genny, if you don't like it park well away".