complete build, good setup? questions
hey I have done lots of reading and phone calls, and decided to go with viltron Lifepo4 batteries if I can get a bulk deal on them. also, if the 15% off coupon I have is still valid. if not, I w...
Forum Discussion
pianotuna wrote:
Itinerant1,
What do you do when the LI's are full and there is still solar to be harvested? I.E. how do you protect the LI from overcharging? I'd love to have your 1280 watts :)
Charging has been set at 14.1 bulk (CC), 14.2 absorb (CV)(10 minute is minimum, can't be turned off), float 13.6 (CV) since day one (27 months ago) and the system has not been turned off since. Living on solar/ Lifepo4. Figuring at least 780+ 30% cycles. With a few totaling 70% DOD discharges after many consecutive days of rain/ overcast.
During these 27 months generator was used roughly dozen times for 2 hour each time putting a 200ah hold over charge into the batteries.
Magnum has sufficient programability along with the Magnum PV solar charge controller. Which follows the inverter/charger programming. If anything happens that would cause conditions beyond programmed limits the BMS will disconnect the charge source or loads.
**Over voltage (highest cell is over 3.8V after a 3 second delay)
** Under voltage (lowest cell is below 2.8V after a 30 second delay)
** Over current (current exceeds 10C for 10 seconds)
**Over temperature (highest cell exceeds 150°F or 65°C)
**Under temperature (lowest cell is below 32°F or 0°C, charging is not allowed)
**Ground fault (There is a high voltage leakage greater than 2mA to the chassis pin)
**Unmanaged cells (The programmed number of cells does not equal the number of cells read)
When the batteries are at "my" full SoC they'll float and solar is powering norcold fridge, tv/dvd, charging phones/ laptop/ tablet, fans.
During the late spring, summer, early fall these items might be on starting as early as 8-9 and still have the batteries full by 12:30 or so depending on solar harvest.
I suppose the best part is if the batteries get full great if not no problem they'll work just as well at a lower SoC for long periods of time also.
If you would like to see misc recorded readings from the Me-Arc display & BMS display at various soc, voltages, amps in/ out what items running. Attached is an excel sheet I put together.
DC display readings
During the period of June 16-20 overcast/ rainy days is where Lifepo4 shows their stuff. June 15 started the evening 99%, June 21 back to 99%.
2018 PT data
Mako Kupa sorry for the hijack
