Sabre602
Putterer/Tinkerer
I am preparing to assemble a lithium house battery bank on my boat and have questions about how to maintain the bank at the correct state of charge to optimize battery life. We will have a 12v, 560 ah bank using 280 ah cells in a 4s2p configuration. 600 watts of solar cells and a large frame 80 amp alternator will both supply a Kisae DMT1250 50 amp DC-DC charger that incorporates a MPPT solar controller. A Sterling alternator protection device will guard against BMS cutoff. Shore power charging will come through a Samlex Evo 1212F-HW 1200 watt inverter with 60 amp charger. We virtually never use AC power aboard...I can't recall the last time I switched on our present inverter...so we don't need more inverter power than that. The reefer is AC/DC so doesn't need the inverter. Everything will be appropriately fused, of course.
I haven't selected the BMS system yet, but am favoring a 100 to 200 amp BMS with a plan to bypass the BMS with a contacter for occasional high current draw with the anchor windlass.
Like most boats, it spends most of the time at the dock. I know that some folks will entirely disconnect the battery at 50% SOC, while others have mentioned setting their electronics to cycle the house bank between 30 to 50% SOC. I would love to get some ideas about how to automate limiting the state of charge. I don't want to have to keep track of when to manually switch the bank on and off. My wife enjoys being aboard even when I'm at work or out of town, and she needs it automated.
Thanks in advance for your experience and suggestions!
I haven't selected the BMS system yet, but am favoring a 100 to 200 amp BMS with a plan to bypass the BMS with a contacter for occasional high current draw with the anchor windlass.
Like most boats, it spends most of the time at the dock. I know that some folks will entirely disconnect the battery at 50% SOC, while others have mentioned setting their electronics to cycle the house bank between 30 to 50% SOC. I would love to get some ideas about how to automate limiting the state of charge. I don't want to have to keep track of when to manually switch the bank on and off. My wife enjoys being aboard even when I'm at work or out of town, and she needs it automated.
Thanks in advance for your experience and suggestions!