The next day, Winston went into the garage and checked out the solar system. He scanned the two inverters and meters. He remembered Grandpa saying he had one set of solar panels installed on the roof when he had the house built. That was sixteen panels, and he had another twenty-two put up after he sold his house in town and had more money. The first set of back-up batteries were the old fashioned flooded lead-acid ones. He checked the water levels for them and added a lot of water. According to the manual he found, the batteries needed to be checked every three months. He bet it’d been much longer. He’d remember to do it for Grandpa.
The second set of batteries were lithium-iron. They were maintenance free and were better than the other kind. You could run them down more without hurting
