My set up is on a boat with lithium batteries. 12 volts DC, 120v AC. All the equipment is new, I am in the installation process. I have 2 Multiplus ii 3000 units programmed split phase (180). I have 240v for the compressor that will use 240v, and I’m, using an auto transformer to convert back to 120v and balance those loads, and an Ekrano GX unit for monitoring. I have everything wired per the installation manual for the multiplus and the auto transformer. 120v IN for both multis, neutral connected between the units on the OUT. I am getting 240v from L1 on each unit. Inverting is working. I have the ground relay connected between one of the Multi units to the Autotransformer. Unit 1 has the Mains green light flashing and the float orange light flashing, unit 2 has the Mains green light flashing.
The Ekrano gave me #49 alarm. Grid Meter not found, I have it set to Shore Power 30 Amp.
I have not reconnected a lap top with VEConfigure to check to see if I can disable the ESS Assistant or (uncheck) Switch as a Group.
Andy help would be greatly appreciated.
Can anyone help me diagnose why I’m not getting charging or pass-through 120v when plugged in to shore power?
Is this grid input also 120/240V splitphase? So MP1 is receiving L1 of the grid and MP2 is receiving L2?
In general, flashing mains light means there is voltage present on the ACin but it is not in an acceptable range either voltage or frequency wise.
If its only a single 120V grid supply, then you need to connect it to one MP only, and disable “switch as group” in VEconfig. You cant use a singlephase 120V input on both MPs that run a 180° splitphase output. But you can use it as a source for one of the two.
GridMeter not found sounds like you have ESS set up, and “connected to shore” sounds like you are on a boat. The two exclude eachother, as you should not use ESS in mobile applications.
Thank you for your reply!! I’ve been pulling my hair out :-). I have the incoming 120v grid power (shore power) into a junction box and split going to both units. I couldn’t find it anywhere in installation instructions or YouTube videos on the correct way to wire the 120v incoming.
I did disable “Switch as a Group” in VEconfig. I found that info online (AI).
As far as I know I don’t have ESS set up. I couldn’t find that in the VEconfig to disable or turn off??
Unfortunately I won’t be able to go back to the boat to make the change and test it until May 27. However I will respond to this thread when I do. I really hope this solves my problem. Totally makes sense.
I also noticed that maybe I need to do something with the neutral-ground relay? As far I can determine they are not connected anywhere.
Does the new neutral from the Autotransformer after converting the 240 back to 120 need to be isolated from the neutral from grid power? I currently have it isolated so that the hot and neutral from the Autotransformer are their own circuit to the breaker panel.
The ground/earthground/PE are all connected. Is this ok?
Thanks again, I finally made it to the boat and was able to re wire and and program as you recommended and now the charging and pass through are working. Only 1 of the units is working for the charging and pass through, but I’m assuming that’s the way it works in my set up. Both units are working for inverting.
I really appreciate your input. I think I could also set up the system with the inverters in parallel and use the autotransformer to step up for my 240v power, however I think this set up might give me more start up power for my 240v compressor load.
Yes, but then you would exclude your system to be used on 120/240V shore power. It could then only use 120V single phase input. With the current config you have both options, but only half the charging power when using single phase shore power. Up to you to decide if thats worth it or not.
I dont quite see where this autotransformer comes into play, is it connected on the ACout? Since you have two inverters in splitphase, theres no need to use an autotransformer, you already have 120/240V output on the inverters. But i guess you are using it for power balancing? If yes, then the neutral of the two inverters should be connected together but not to the transformer, like its shown in the manual under inverter balancing
In general, all PEs that originate on the boat are usually connected together. If the shore connections PE also needs to be connected to the rest of the boat grounding is something else. Also depends on your hull material. But better to ask someone thats professionally working with boat electrics
Please correct me if I’m missing something. I decided to do split phase with the autotransformer (my shore power would normally be 120v 30a) because while inverting I have the option to run my 3hp 240v electric motor on the dive compressor (with a soft start and unloaded for starting) and my normal inverter usage for the rest of the boat (120v single phase AC panel) the 120v loads will be balanced across both inverters. I should be able to get more amps at 240v. power out of the split phase inverters vs making them in parallel then doing the mobile step-up to 240/120?