LifePo4 Voltage at .5C - .6C Discharge

pianotuna wrote:
To use a phrase I started here, many years ago. "capacity is king". Design sufficient worst case capacity and add 10 to 20%. That may lead to lack of angst on camping trips.

Itinerant1 has done so, and any thinking person would do the same.

BFL13 approaches solar and storage from the minimalist point of view and has great fun doing so!

For those interested.

I had plenty of time on my hands yesterday so decided to do a daily use recording. I do this periodically so I can go back in time and cross reference loads to SoC to Voltage to see if anything is amiss or losing capacity.

This here also shows that unless you are coulomb counting it is almost impossible to get an accurate SoC to voltage especially if there is any charge/ load even a small amount will matter.

We normally would of run from the heat by now but I have a couple more days of business before moving to cooler weather. I did record what the solar was contributing during the day at recording times along with outside ambient temp (F). If you look at the remarks you'll see gen started for the air conditioner/ 120v loads and solar is just charging batteries/ 12v loads. Once the batteries are full the gen is turned off and batteries/ solar is running the entire loads for a couple hours, after that the gen is started again to keep the trailer cool for a short bit longer. Using the batteries till 65% +/- Soc gives plenty of power for the night/ morning till the sun comes up and recharges to do this over again. Saves a couple hours of gen/ gas each time if it's hot.

The microair add on last year is doing a great job of slowing the current from the locked rotor instead of throwing 200a at once.




Solar production past 2 days.