Where did you see the 10% off easter discount? I don't see it on the page.

Yeah, I'm considering this battery: 12V 50ah: https://us.amazon.com/ECO-WORTHY-LiFePO4-Lithium-Rechargeable-Scooters/dp/B01JCUGBJ2?_encoding=UTF8&pd_rd_i=B01JCUGBJ2&pd_rd_r=36dfbd99-2b32-4f6a-aecd-f512c21c5be2&pd_rd_w=Ltymf&pd_rd_wg=y1MND&pf_rd_p=d495c3b6-b08c-488d-b587-92006fef8456&pf_rd_r=FHJEY8JY7BJNEBETMK33&psc=1. I'm not sure if it's good.

For the controller, I'll use a cheap PWM, because this flow chart on this site indicates that PWM and MPPT would be similar under my conditions. (https://www.solar4rvs.com.au/buying/buyer-guides/choosing-the-right-solar-charge-controller-regulat/).

I think I might get this controller: 20A
https://www.amazon.com/GHB-Controller-Intelligent-Temperature-Compensation/dp/B01LZZMDSQ/ref=sr_1_11?dchild=1&keywords=solar+charge+controller&qid=1617401805&s=lawn-garden&sr=1-11