Err 25? No, that's not enough. 12v x 100Ah = 1200wh. But if you want them to last, you can only use 600wh. So you need roughly 50 if you want them to last. Like Recharge said. It's going to be more than you want to pay for. To put it into context, I use about half of what you're proposing to use - And my wife owns an electric car, and I own an electric motorcycle. 1300w is not a lot of power. But 1300w over 24 hours, even with zero buffer (Someone else pointed out - rainy days?), is a huge amount of energy.