Originally Posted by jeanathon
Yes I am only planning on using the electric propulsion
or shooting an inlet. If I decide to do canals or what not I will add a disposable generator
to the mix.
is way overpowered at 24 KW at 36 volts with an EV1 controller. Current panels
are 2 x 45 watts and a 30 watt. Currently looking at some 200 watt panels
Not sure yet if I can use this motor
for hydroelectric generation via the prop unless I put a manual disconnect to the controller.
36 volt bank is 750 amp hour consisting of 3 batteries.
12 volt bank is yet to be determined. No inverter
and minimum electronics
ie. no autopilot
, fridge, or watermaker
. All interior
lights are LED.
The boat ways in at 7000 lbs.
Just me and two dogs
although I might take current
girlfriend, but that is yet to be determined.
1. You are now generating a small amount of nominal 12V with solar panels
. You plan to greatly increase this solar
2. You may use a hydrogenerator (from the propulsion
3. You may have an engine-driven alternator
4. You may have a shore-power charging
source and/or a portable generator
1. You will have/have a small 12V bank (for house, ancillary use, engine/gen starting).
2. You have a large 36V bank (for the electric
How to charge the 36V propulsion bank when all your present and future electrical
power sources are, or likely will be, 12V?
You basically need a 12V DC-DC stepup device capable of 36V battery charging
(in other words, a battery-to-battery charger), tightly controlled in order to baby the 36V bank.
The easiest solution is a Sterling Power battery-to-battery charger (BTBC)
(I have no connection, other than admiring practical design).
Sterling makes a number of different models in various voltage and amp input/output combinations.
This BTBC device (in your case, 12V in to 36V out, see p/n BBW1236 below)
allows your various normal 12V charging sources to feed the 12V (house) bank (large or small, it acts as a buffer).
The BTBC is positioned between the 12V house battery
and the 36V battery bank, which receives the BTBC's controlled multistage 36V charging output.
Think of the BTBC as a 12V input smart Duo or Echo type device for passing on a voltage increased charging current to the 36V bank.
You can search for these Sterling BTBC's online, suggest that you look at/download their whole catalog to get the full description of the BTBC and other devices available.
I'll put some selected quotes from the Sterling catalog to further explain:
" The key thing about this product is the ease of installation
fact it does not work nor change anything on the standard engine/vehicle system and as such does not raise any warranty or installation
Fully programmable for different battery types.
... "the best way to charge a battery is using a 4 step battery charging curve
(that cannot be achieved from a standard alternator).
This system enables one to simply attach the unit to a standard engine
battery and it will fool the alternator
into working at it’s maximum ability and ensure all it’s surplus power is used to charge the auxiliary battery bank (your 36V bank)
to it’s maximum.
This system is designed to use only the surplus power and ensures that at all times the power required to run the primary system (the vehicle system or the boat engine (your house/starting bank)
) is not affected.
The surplus power is converted into a higher voltage and used to charge a secondary battery bank using a digitally controlled programmable 4 step charging curve (settable for different battery types, SLA/AGM/GEL/LiPo/etc)
as per all the other high charge products Sterling makes." ...
... "We also offer a range of 12-24V / 12-36V / 24-24V / 24-36V / 24-12V"...
"Battery to Battery chargers / IP68 FULLY WATERPROOF
D/C Input voltage D/C output voltage Amps in Size L x W x D Weight Part nos
12 12 25 230 x 135 x 65
12 24 25 230 x 135 x 65
12 36 25 230 x 135 x 65
24 24 13 230 x 135 x 65
control for the above"
Seems like the simplest solution to your overall problem to me. One configurable charging device between your 12V bank and your 36V bank.
Independent from any/all of your 12V charging sources, and a full featured charger
for your 36V bank.
And I think they don't cost that much either.
Couldn't reproduce some of the figures for the above, read the Sterling literature (hard to C&P from a pdf doc sometimes).