I had 1 extra 100 watt solor panel to use for a small project. Never got around to it. Then I bought 2 more LiFePo 100AH spare that were on sale for a lot less money than those three Battleborn 100AH batteries in case I needed them. Then I found 2 more Renogy 100Watt panels on sale for small projects. Hmmmm.... Then I needed charge controllers for them, so I bought two 10 Amp charge controllers and one 600watt 120 volt inverter. Now I have a total of seven 100watt solar panels, one 5000watt 240 volt inverter, one 500watt 120 volt inverter, and one 600 watt 120volt inverter and two 30 Amp charge controllers. The 500 watt inverter is in the SUV but I've never bothered to connect it to the battery. When the SHTF, I'll bet that I get off my butt and connect all that stuff up. So far, I have mounted 4 solar panels to the South facing back deck just in case I need to do a quick connect to the House.