I know this has been discussed previously, and I did dig around a fair bit, but I have some questions about our particular use case.
We have installed one bank of four Li-time group 24 with bluetooth batteries in our sailboat v-berth in a 4s, 48 volt configuration for propulsion. We installed these about three weeks ago and have been through one discharge/charge cycle. They are currently at 13.37v or thereabouts (each) and showing 99%. I have the second set that I just got shipped charged up to 100%, all four showing 13.46V +/- 10mV and ready to be installed for the second bank.
Ok, now the question. The daytime temperatures in our area are getting up to 97F to 100F. The batteries in the v-berth are not in direct sun but I would imagine they are getting near that temp for several hours each day. The nighttime temps are around 68F.
Am I killing the batteries having them at 99% SoC while being stored in those temperatures for a few hours a day? How much if so? I will be extremely happy if I get 500 charge/discharge cycles before they drop to 90% as that should be enough to complete the 6000 mile Great Loop over the next 2 years. Is this realistic while treating the batteries such, or should I be pulling them out of the boat and storing them at 70F in the house. This is quite the pain to do since we are wanting to test the boat in various ways this summer. Alternatively, would discharging them to 50% make a huge difference in storage? Am I being too anal here and 99F for a few hours each day is just nothing to worry?
We have installed one bank of four Li-time group 24 with bluetooth batteries in our sailboat v-berth in a 4s, 48 volt configuration for propulsion. We installed these about three weeks ago and have been through one discharge/charge cycle. They are currently at 13.37v or thereabouts (each) and showing 99%. I have the second set that I just got shipped charged up to 100%, all four showing 13.46V +/- 10mV and ready to be installed for the second bank.
Ok, now the question. The daytime temperatures in our area are getting up to 97F to 100F. The batteries in the v-berth are not in direct sun but I would imagine they are getting near that temp for several hours each day. The nighttime temps are around 68F.
Am I killing the batteries having them at 99% SoC while being stored in those temperatures for a few hours a day? How much if so? I will be extremely happy if I get 500 charge/discharge cycles before they drop to 90% as that should be enough to complete the 6000 mile Great Loop over the next 2 years. Is this realistic while treating the batteries such, or should I be pulling them out of the boat and storing them at 70F in the house. This is quite the pain to do since we are wanting to test the boat in various ways this summer. Alternatively, would discharging them to 50% make a huge difference in storage? Am I being too anal here and 99F for a few hours each day is just nothing to worry?