Brain not working to do solar math...Assistance needed

Brain not working to do solar math...Assistance needed

So I have a Goal zero yeti 400 AGM lead acid setup + an extra 33 ah AGM attached via the power pole.

So I think this gets me to 66ah?

If I have a 20,000 Mah Anker battery pack to charge iPhones, iPad etc.. How many charges should I get out of the Goal Zero Yeti 400 66Ah setup?

I only want to take the Goal Zero system down to 80% before I recharge it to get the longest life out of the batteries.

I hate to admit it but I'm struggling with the math here due to all the variables. I.E.: 12v, 66Ah, Mah, Watt per hour.

I'd appreciate an explanation.

submitted by /u/toolfanAPC
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