[CA] [CA11] Power Cosumption Opinion (element 7 vs 9)??

[jtleeds]

To Raymarine, I am set on upgrading my electronics and currently have, stand alone A65 (2007) and stand alone Furuno radar (rarely used). I am going w the Element 7 or 9hv....and see the power used is rated at 15 watts vs 20 watts.....now, my battery system is dialed in......2 separate banks, 1 start batt set up and the House is 2 6volts in parallel...New AGM's installed recently.....Main ? is: will I notice a big difference between going w the 7 or 9 element in power consumption ????? I fish in Ocean exclusively on the west coast.....thx for you help
Capt JT