MPP LV65 Failing Over to Utility When Battery Fully Charged

Skypower said:

What does your Solar Assistant show for inverter one ? If you are using SA to change states and it is not showing inverter one as the unit you have as master there could be some issues.

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Robert Ibe said:

How much total output amp limit do you have from your batteries bms , could the surge be making the bms shut the batteries down. thus switching to grid ?

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jibberishballr said:

I think this might be the right thread to bring this up. . I have a similar situation where I don't fully understand the "overload bypass" and "overload restart" options on my split phase lv6548 setup.

My use case: I have "back to battery" setting at 53v and "back to grid" set to 50v. As expected when a larger load (dryer, AC, etc.) kick in, voltage drops and if it gets to that 50v it will kick in to grid to support. After the load lessens and the voltage is recovers back above 50v, the battery typically becomes the source of energy (or solar does that job during a sunny day). I run SBU and "solar only" for charging on both inverters.

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jibberishballr said:

For some reason, grid continues to charge the battery (sometimes even past 53v) with these settings. I'm grateful I have that option, but when I know a sunny day is coming tomorrow I'd rather not charge my batteries with grid, and only have to use grid to power my loads until the next morning.

Any ideas?

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Zwy said:

In order to switch back to battery power and out of bypass, the LV6548 will probably charge until the 53V is reached. I know if mine switch to grid bypass under low SOC, it will charge until the back to battery voltage setting is reached.

One thing that would help your situation is a larger battery bank to help with voltage sag under heavy load.


List all your settings.

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Zwy said:

Disable the Automation feature. Most likely it is overriding your back to battery setting.

I don't care much for the Automation feature in SA. I tried setting it a few times, the result was operation I did not like. Adam made a video about SA on the EG4 6500EX long ago and he was as confused as anyone else.

If you have it set for back to grid in the 48V area, which I use and not 47V, it will switch to grid. When it hits back to battery voltage, which you want set at 53V, then it will switch back to battery.

I do have charging set for grid and solar, I see you have solar only.

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Skypower said:

Your inverter has the same firmware as mine but it looks like you are running the Beta Solar Assistant. I’m running the SA release 2023-08-16. I’d try to disconnect the SA and use the settings manually. If that doesn’t help, another direction is to swap the position of master inverter. Remember the fun of split phase set up? I noticed a difference in SA Solar PV setting- PV power balance and you have your float the same as your absorb. I guess you’re just giving the cell some quality time with the balancer. View attachment 196015View attachment 196016View attachment 196017View attachment 196018

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jibberishballr said:

Thanks. Couple questions:

How do you adjust the "PV Power Balance" setting on the inverter? I am not able to adjust it within SA.

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jibberishballr said:

Thanks. Couple questions:



What do you mean by swap the position of the master inverter? Do you mean switch which inverter is 2P1 and 2P2?

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