Sometimes it helps when people share real world data.
I have not turned my batteries off since I had lithium batteries installed in early April, because I wanted some real life observations. I have camped about every other week with electric hookups. I sometimes deploy the portable panel, but not frequently.
Last weekend, my [email protected]
was parked at my brother's with rooftop solar, only. I left the batteries and fridge on, but the solar was all but useless due to cloudy and rainy weather. Driving home, the battery bank was partially charged, but it was under 50% Monday night. This has been a mostly cloudy week in W PA (pretty typical) and so I knew I was going to be completely draining my batteries for the first time.
The Lion Energy batteries, like most good lithium batteries, come with a BMS built into shut them down and protect them when they reach a certain point. That point varies by manufacturer.
When I checked my batteries this AM, I learned that the BMS had shut them down overnight. The Victron app showed me that the voltage had reached 10.0v volts (That is the stated low voltage disconnect for the 10ah Lion battery.). Even the small amount from morning rooftop solar, with the sun in the east and the trailer pointing south/southwest, had provided enough power to charge the batteries sufficiently to turn the batteries on, again.
The current state of charge on the Vicfron, however, was now reading 100% with a current voltage reading of 13.29 (full sun.) I know full well that the state of charge is not at 100%, so I will be interested to see what kind of voltage reading I get when the sun goes down.
This time of year is as good as it gets for solar, and it is a mostly sunny day, today. Here are the readings I am getting. Portable 100w Renigy Eclipse with Vuctron Smart Solar 75/10, aligned with sun[email protected] Factory Rooftop Solar (Sunflare 105w) mostly, but not directly in line with sunVictron BMV
2021 [email protected] 320 Boondock "Mattie Ross" | 2021 [email protected] Nights: 115 | Total nights in a [email protected] 326 | 2018 Jeep Grand Cherokee Trailhawk | [email protected] owner since 2014