12 V 3.8 A water pump to 12 V 625CCA battery
A Solar panel of 12V and 3.8Amps. That 8A of the fuse is to avoid break in the rush. Some motors have a high start current. Can be up to 7x the nominal current. However, I do not recommend you do it. Because in low light, the pump can stop and break. It's a good ideia if you use both. The solar panel and the battery.