Todays project is a diy LiFePo4 battery backup. I wanted to make something small that will run my 120v return pump and a wave maker for as long as possible. Never hurts to be prepared right? This will be an Amazon build, I started off with an inexpensive12v 18ah LiFePo4 battery.
since I want to run 120v ac pumps off this I needed a small inverter to get as much life out of this battery as possible. I found a 150w pure sine wave inverter that would fit the bill without too much excess power usage.
And to keep the battery charged I needed a float charger.
Now for the fun part! I needed a 120v controlled relay that will automatically switch over to the 12v dc in the event of a power failure. Well lookie there. Amazon sells one of those too.
You
The plan is to keep the battery tender plugged in and connected to the battery. The output from the battery will run through the relay and then into the inverter. That will be connected to the outlet that the return pump and wave maker are plugged into. In theory the relay *should* automatically switch my power from the wall to the battery cleanly without back feed. Any electrical engineers in the crowd?
since I want to run 120v ac pumps off this I needed a small inverter to get as much life out of this battery as possible. I found a 150w pure sine wave inverter that would fit the bill without too much excess power usage.
And to keep the battery charged I needed a float charger.
Now for the fun part! I needed a 120v controlled relay that will automatically switch over to the 12v dc in the event of a power failure. Well lookie there. Amazon sells one of those too.
You
The plan is to keep the battery tender plugged in and connected to the battery. The output from the battery will run through the relay and then into the inverter. That will be connected to the outlet that the return pump and wave maker are plugged into. In theory the relay *should* automatically switch my power from the wall to the battery cleanly without back feed. Any electrical engineers in the crowd?