I'm about to install 20 of the 100W Renogy solar panels on my house and I'm trying to figure out how many lithium-ion batteries I'll need. Specifically, I'm interested in how many batteries are necessary for emergency backup and how many I would need to go completely off-grid. I've been checking out Battery Hookup for options, but I feel a bit lost on what my next steps should be. Any advice?
3 Answers
Before you start buying anything, understanding your energy needs is super important. Check your past electric bills or use a device like a Kill-A-Watt meter to see how much energy your appliances actually consume. For instance, my house uses about 22-25 kWh daily. I went for a 30 kWh battery bank to ensure I could keep everything running, at least for a day during outages. Just aim for enough battery capacity to cover your daily usage and any additional winter needs!
Exactly! Knowing your energy consumption will save you from buying unnecessary equipment.
You might want to consider the ratio of panels to batteries if you're seriously thinking of going off-grid. A common rule is 1:4 for battery capacity to daily use. 20 panels will generate a lot of watt-hours but make sure you’re not overkilling it with 100W ones! With the right setup, you could get by with only 3-5 larger panels and fit them into your needs much better!
Good point! Efficiency is key here.
Yep, I've seen so many go overboard when they really just needed fewer, larger panels!
It's a bit unusual to go for 100W panels these days. Many people recommend 400-600W panels since you can get more power for less hassle and fewer connections. As for batteries, if you have grid backup, just look at your daily usage in kWh. For example, if you use about 10kWh each day, you'd want a battery capacity between 10 to 16kWh to cover your needs effectively. Also, if you aim for longevity, consider increasing capacity to reduce cycling.
Yeah, and don't forget that your location can also impact how much capacity you might want!
Totally agree, the more capacity you have, the better it is in the long run!
Right, starting with that data is key to making an informed decision!