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^ P=IE is now W=AV. Kinda like new math. Which makes E=IR old hat so V=AR.

You and I know it as it has been for my last 69 years. I've seen it written the other way by folks new to the party. Relax, my comment was tongue in cheek.

I'm curious about charge time also. How do we compute this? SCC or battery charger source. For instance a 12v 100ah battery discharged 20% of capacity. Would one hour charging from a 12v 20amp charging source top it off.

Will I enjoy your videos and now have your book as reference but all my questions are not answered. Everyone bare with me please. It's likely very simple but I'm confused after looking at several vendors methodology in selecting a charge controller. Some vendors use a working voltage which...

Thanks for the advice everyone.

The specs give two voltages. Not sure which one to use.

I've a newbie to this solar stuff and jargon used. Now a little confused about what Alibaba call pieces regarding these 4PCS Lifepo4 Rechargeable 3.2V 280Ah li-ion Lithium Battery for Solar System for EV . Are they saying a piece is one cell of 3.2v for 583 dollars shipped to the USA or are...