If consistency on the rate of flow for your pond isn’t critical for your pleasure – or your turtle’s needs – a solar fountain solar pump is a great option, with or without backup power. If you require a consistent flow, you might consider a solar fountain pump that has a battery backup. The battery can maintain things even when the sun isn’t as strong on some days as it is on others. It can also keep things running at night if there aren’t enough solar cells to generate enough energy.