Growatt Settings Explained

What do each of the growatt settings mean and how should you set up your system for off-grid or grid-support?

Intro

Here is a list of the settings for the Growatt SPF 3000TL LVM series All-In-One inverters. I have the 24V model but the settings are nearly identical for the 48V model. Below the full list of settings are some use-cases that can help you set up your own inverter.

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The Settings

Setting #	Setting	Options	What I use
1	Output Source Priority	This sets which power sources will be used in which scenarios. Power sources include battery, grid (or generator), and solar. SBU: Solar > Battery > Utility Switch to grid power if battery goes below voltage in Setting #12 If you are using the system while also connected to the grid, you probably will use this setting SOL: Solar priority Switch to grid power if battery goes below voltage in Setting #12 OR if solar power is not avaliable (at night) Use this to keep your batteries full at night so they are ready for a power outage UTI: Utility priority Default to the grid if it is avaliable. Solar will charge batteries, but will not power the inverter. If you do not have a grid connection and want your system to run on a generator when connecetd, this option is for you!	SBU. I use my system as Grid-Support to save money and make it through short power outages. Explained below.
2	Total Max Charge Current	Total charging current of utility+solar. Set this to the maximum charging rate of your batteries. My batteries reccomend 20% of C20 which means charge at 20% of the 20-hour capacity. The faster you charge a battery, the shorter its life span will be. NOTE: The charging current is at the voltage of your batteries, so setting this to 42A for a 24V battery means charging at 1008 Watts.	42A My battery's C20 rating is 105Ah so the batteries should be charged at 20% * 105 = 21A. Because I have my batteries in parallel, I can double it to 42A.
3	AC Input	This setting allows you to control the acceptable voltage that your inverter will pass through from the generator or grid. APL: Appliance 65-140V GEN: Generator 65-140V (I'm not sure, but I think this allows a wider frequency range too) UPS: Uninterruptable power supply 95-140V - Useful if you have sensitive electronics	APL My grid is uaually on or off, rarely at some voltage outside of 110-120. I would consider switching to UPS, but it doesn't seem to matter much to me.
4	Power Saving Mode	SdS (disable): The inverter is always on, ready to power loads. SdE (enable): The inverter turns itself off when there is no load. It does detect when a load returns, but it will shut off low-load devices automatically (like lights). If you use no power over night, this will turn off the inverter and save you from drawing ~50W from your battery the whole night.	SdS I always want my inverter ready to take over loads and I don't want my fridge to turn off
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