I'm looking to understand how to configure a solar power system that can provide backup electricity when the grid goes down. I currently have a grid-tied system and want to know if I can use a transfer switch to disconnect from the grid and power my home using solar panels. I've heard that Enphase microinverters can do this, but I'm more interested in string inverters combined with battery backup. What's the best way to ensure I can still use solar during outages? I don't lose power often, but after storms, it can take weeks to get restored. I'm planning to size my system for reliable power nine months of the year, but I still need clarity on how net metering works in Louisiana, as it seems pretty complicated and potentially unfair. I'd like to develop a setup that can cover my energy use through spring and fall, and I want a battery that supports running my house, minus the central A/C, during long outages. I intend to build the system gradually, so I want to start with the right components that won't require frequent changes. Any tips?
4 Answers
If you want reliability without too much hassle, batteries are a must. You could invest in a large battery system instead of just relying on something like the Enphase backup. Enphase can manage power loads pretty well, but without sufficient battery storage, you're risking damage to your home electronics if conditions shift suddenly, like clouds blocking the sun.
For what you want, a hybrid inverter is the way to go. I'd recommend the Sol-Ark inverter; it's solid and avoids the issues with some other brands. You can connect your string panels to it and combine it with Lithium Iron Phosphate (LFP) batteries to keep your home powered during outages. Plus, the Sol-Ark acts like a UPS, ensuring power stays on consistently. I'd suggest at least a 15K inverter and 15KWh of battery storage, along with around 8KW of PV for optimal performance. You can always scale up your battery and PV later if budget allows.
What you're looking for is totally possible with either a hybrid inverter or microinverters that have battery support. When set up correctly, these systems will seamlessly switch to using solar and battery power if the grid fails. You can even add a generator to keep your batteries charged during prolonged outages. Personally, I set up a DIY system with a Sol-Ark 15k inverter coupled with 61.4kWh of batteries, and we've gone weeks without grid power without issues. My inverter can handle the full load, even running the AC without a hitch. Just be sure to compare battery costs for both systems, as that can help you decide. And regarding the utility payments—yeah, you won’t pay the same rate for grid energy versus solar energy—you’ll pay for what you use and get compensated for what you send back.
I see now! Adding batteries is essential; without them, solar panels can’t operate during an outage. Can a 15k inverter really handle a 17.85kW system? I plan on starting installations this fall, but it’s too hot right now to do much.
So the Sol-Ark is both the inverter and the backup, right? Sounds perfect! And I'm seeing some 15kWh batteries around the $2k mark—seems like a smart investment to make eventually.