Grew up on a Sailboat, looking to cruise
again.....sooo I am doing my research
first but am starting from a shallow baseline. I have read up a bit but wanted the opinion of some seasoned hands to see if I am tracking correctly. So I was pondering my battery
set up. The following are my assumptions....always dangerous.
6 x Surrette 2 Volt 5000 Series DC Batteries
each advertised at 1766 Amp hours (At $815 a Battery
this is looking painful already). So I will have 12 Volt DC set up with 10,596 Amp hours available at full charge. I am hoping for a total of 1,000 Amp hour usage per day (AC, water
maker fridge, freezer
, water heater
, lights etc.). This is of course if my math is correct, for example: (Damn it Jim, I am not an electrician!)
Air Conditioner...10 DC Amps = 1 AC Amp at 110 Volts. The Air Conditioner is a 220 Volt unit drawing 3.5 AC Amps. So 20 DC Amps through an inverter
(-10% efficiency)= 1 AC Amp at 220 Volts. Meaning I need 70 DC Amps (+7 for inverter
inefficiency)...So 77 DC Amps per hour to operate the 3.5 AC Amp draw at 220 volts to run the Air Conditioner. If I wish to run it for 8 hours (sleep time) then it is 8 (hours) x 77 (DC amps)= 616 Amp Hours from my 12 volt DC rig per day. If I have this correct mathematically and what not then I have a base line to start to figure out the whole system trying to keep the rest of the usage to 384 Amp hours per day max.
So if that is correct, it means I am draining my batteries
to a maximum of 91% charge meaning I can get thousands (up to 5000 advertised) of recharge cycles (13 years+ plus usage). Ideally I am looking at recharge through a wind
combo set up 1 or 2 D400 Industrial Wind
Generators and 2 160 Watt Solar Panels
pushing about 15 Amps max each. I know my recharge is sun and wind dependent so I intend to monitor
the entire input/output with a comprehensive Battery Monitoring System (maybe Bogart but don't know yet) to scale my amp use up and down to keep my batteries from dropping below 90% whenever possible. I live in Florida
by the way so lots of sun and a bit of wind.
So here is the vexing question IF the above is correct and my research
on course. Under optimal conditions a D400 and solar panels
can push maybe 70-80 Amps back into the system meaning full day recharge of well over 1000 amp hours. But Solar
is only 8 hours a day if lucky and wind is unpredictable....so I wont get that unless I add more power generation (trying to stay away from generators or running the engine). Can the system absorb the full amps under ideal conditions or will the charge controller limit the recharge making my 1000 Amp hour in a sailboat a bridge too far?