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In researching and installing other systems open-loop communication works just fine as long as the charge settings are set correctly. In a year or so that won't be up to code in most grid-tie installations (UL 9540 coming that requires inverter-battery integration on charging) but for off-grid...

I have the same question - want to use 20 EG4s on a 4-stack of Sunny Islands - did you learn anything you can share with me @Justenuf ? Others? Thanks!

Just cause they can handle the heat why throw away power? I would never consider using 6 AWG wire for anything over 80 amps just from a voltage drop and power loss perspective. Use a basic voltage drop calculator. In the PV industry we seldom let any PV inputs fall below 1.5% drop - I...

And does the Muller have a low temperature disconnect?

Hey Thanks for the reply! Great info - so I'm curious if the setup with the Muller needs contactors to be installed as well. The XP spec sheet refers to them with the Valence external BMS and I've seen them on many high voltage setups on u-tube - not sure if needed for 2s 3p at 24V. I've...

Yes assuming you are at 12 volts then your inverter will draw a max of 250 Amps - so parallel cables will only see 1/3 of that so at 85 Amps or 2 AWG BUT the final output wires from the pack to the Main DC disco and from the Disco to the inverter will definitely have to be 2/0 at minimum 4/0...

And I was speaking for distances below like 10' - you have to consult a voltage drop calculator and I recommend staying below 3% volt drop on all cables. but for most van setups you are closer than 10' if you keep the batteries and inverter close. So it depends on your total inverter and DC...

Hey syspig - so I have had the same concerns - I'm a career solar engineer - 40 years - so can provide some insight. First switches don't tend to fail but they do tend to get accidentally switched off - but I'm planning on just mounting so that can't happen - not a major concern. But as for...

Hey there Me72 - I am considering buying 6 U27-12XPs for the same 2S 3P 24V config. I'd love to hear what you learned? Same questions as everyone has - do I need to worry about external BMS and if so what exactly? Were you able to get all your questions above answered anywhere? It would save...