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Hi Rob,
Since there's different voltages at each stage, it's easiest to work in watt-hours (Wh).
Your bike battery is 10ah at 36v nominal, so 360Wh
check the nameplate on your charger to see it's maximum output (likely 2A @ 36v, so 72w). That's your minimum inverter size.
If you plan on completely recharging the ebike each day, take the 360Wh and divide by 12v to get 30Ah. That's the minumum lead-acid (we'll call it house battery) size you'll need. Probably wise to add
about 20% to that, to cover losses and lower than rated performance. You can connect a few smaller batteries in parallel if size and shape is a factor.
Solar panels are rated in watts (the actual raw output is about 17v). Take your expected hours of direct, intense sun per day and multiply it by the power rating to get the Wh output of your panels. That has to be greater than 360Wh for your purposes. If you can expect 10hrs per day of great sun, you'd need a minimum 36w panel. In reality you will not get great sun every day, the panels won't be perfectly oriented, and you'll have some losses from the controller, so I would at least double that.
That's the quick-n-dirty calculations. There's certainly room to make it all more efficient, but if you're just experimenting and learning, go with what's cheaply available. If you're serious, it's always wise to overbuild capacity (i.e. I'd use a 100w solar panel, 100ah house battery because those sizes are quite common and
you'll have more flexibility)
One thing to watch out for is that cheaper inverters use a "modified sine wave" output. Sometimes computer and ebike chargers won't work with that. Try to get an inverter that is "pure sine" output to avoid that risk.
Good luck with your project! One thing you may realize is that power from a wall outlet is incredibly cheap vs generating your own.
Travel charger for 36V Lithium battery with 12V cigarette lighter socket. Allows recharging all 36 Volt Lithium batteries (42V DC) via a cigarette lighter 12V car, motorhome, boat ...
To properly choose your electric bike charger, check the voltage of your battery and its connections.
This charger is designed to charge Lithium batteries with a nominal 36V and 42V max.
Charging current: 2A / Voltage: 12V / 36V
We offer three types of charging connectors to choose from for this charger: XLR, RCA and DC Jack (2,1x5,5x12mm)
This charger is equipped with a protection function against the discharge of the battery of the vehicle to prevent its voltage drops sharply when charging the battery of the VAE. If the voltage of your vehicle reaches 11V, the charger cuts it.
Attention does not work with Btwin batteries from decathlon, Bosh, Yamaha, Brose.
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| #16 |
Registered User
Join Date: Jan 2013 Location: South Texas Boat: Newport 28 & Robalo 20 Posts: 386 | Re: Charging a 36 volt bank with a 12 volt controller Quote: Originally Posted by jeanathon
Deck, Yes I am only planning on using the electric propulsion for marinas or shooting an inlet. If I
decide to do canals or what not I will add a disposable generator to the mix. Conditions: Storage- Problem: Solution: 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). 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 and the ...
"We also offer a range of 12-24V / 12-36V / 24-24V / 24-36V / 24-12V"... Seems like the simplest solution to your overall problem to me. One configurable charging device between your 12V bank and your 36V bank. Couldn't reproduce some of the figures for the above, read the Sterling literature (hard to C&P from a pdf doc sometimes). |
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| #17 |
Registered User
Join Date: Apr 2011 Location: Sacramento, California Boat: Solar 40ft Cat :) Posts: 1,523 | Re: Charging a 36 volt bank with a 12 volt controller Great to see another electric boat. |
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| #18 |
Registered User
Join Date: Mar 2012 Location: WNC mountains U.S. Boat: Boatless Posts: 969 | Re: Charging a 36 volt bank with a 12 volt controller Deck, Tx J Simplicity is elegant. I will read up some more on that device. Nimble, __________________ |
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| #19 |
Registered User
Join Date: Feb 2011 Location: Northern and Southern California Boat: too many Posts: 3,731 Images: 4 | Re: Charging a 36 volt bank with a 12 volt controller Quote: Originally Posted by jeanathon Deck, Tx J Simplicity is elegant. I will read up some more on that device. Nimble, The controller has a max amps it can operate at, lets say 300 amps. At 48 volts that is 14,400 watts / 746 = 19.3 hp. At 12 volts 4.8 hp. |
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| #20 |
Sponsoring Vendor Join Date: Dec 2003 Location: South Carolina Boat: Philip Rhodes Custom Posts: 414 | Re: Charging a 36 volt bank with a 12 volt controller Quote: Originally Posted by Tx J Conditions: Storage- Problem: Solution: 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). 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 and the ... "We also offer a range of 12-24V / 12-36V / 24-24V / 24-36V / 24-12V"... Seems like the simplest solution to your overall problem to me. One configurable charging device between your 12V bank and your 36V bank. Couldn't reproduce some of the figures for the above, read the Sterling literature (hard to C&P from a pdf doc sometimes). Comparison of Sterling 12 to 36 volt - - - Yandina Trollbridge36. List
price: $278 - - - $199 |
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| #21 |
Registered User
Join Date: Apr 2011 Location: Sacramento, California Boat: Solar 40ft Cat :) Posts: 1,523 | Re: Charging a 36 volt bank with a 12 volt controller OK, so the common brushed series motor, controller is probably from a golf-cart. Given you need little power from it, at 12v you might not need a controller at all, just apply 12v directly from the battery. The standard controller reduces the voltage to the motor at low throttle. Quote: Originally Posted by jeanathon It is an old motor out of a forklift. The motor and more importantly controller use either 36 volt or 48 volt. At 12 volts the motor would put out sufficient power, but I am not sure what drawbacks I would have running it lower than rated. |
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| #22 |
Registered User
Join Date: Mar 2012 Location: WNC mountains U.S. Boat: Boatless Posts: 969 | The controller came out of the same forklift, and controls forward and reverse as well as the speed. The motor has 5 posts, and 3 coils. If I understand correctly at high speed it drops one of the coils to reduce resistance. Although I'm pretty mechanically minded, I think wiring all that from scratch maybe a bit beyond me. __________________ |
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| #23 |
Registered User
Join Date: Apr 2011 Location: Sacramento, California Boat: Solar 40ft Cat :) Posts: 1,523 | Re: Charging a 36 volt bank with a 12 volt controller With 5 posts, it would be a brushless motor, so you can't just run it on 12v directly, you need the controller. You could still perhaps convert 12v to 36v just for the controller input and still have the battery and chargers 12v. Quote: Originally Posted by jeanathon The controller came out of the same forklift, and controls forward and reverse as well as the speed. The motor has 5 posts, and 3 coils. If I understand correctly at high speed it drops one of the coils to reduce resistance. Although I'm
pretty mechanically minded, I think wiring all that from scratch maybe a bit beyond me. |
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| #24 |
Registered User
Join Date: Mar 2012 Location: WNC mountains U.S. Boat: Boatless Posts: 969 | Re: Charging a 36 volt bank with a 12 volt controller Quote: Originally Posted by nimblemotors With 5 posts, it would be a brushless motor, so you can't just run it on 12v directly, you need the controller. You could still perhaps convert 12v to 36v just for the controller input and still have the battery and chargers 12v. I wish it were brushless! I believe the problem with this solution is the amount of amps. I did a quick search for such a beast, but only came up with some very lightweight dc to dc converters. __________________ |
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| #25 |
Registered User Join Date: Jun 2013 Location: canada Posts: 4,156 | Re: Charging a 36 volt bank with a 12 volt controller Quote: Originally Posted by Andina Marie Comparison
of Sterling 12 to 36 volt - - - Yandina Trollbridge36. List price: $278 - - - $199 this solution doesn't help him. the boat has a single 36v electric motor. he doesn't have a 12v motor running sometimes to charge the 36. like a trolling boat does. the 36v bank should stay intact. and be charged by 36v. otherwise he can't charge his main engine battery unless the engine is not on. which is silly |
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| #26 |
Sponsoring Vendor Join Date: Dec 2003 Location: South Carolina Boat: Philip Rhodes Custom Posts: 414 | Re: Charging a 36 volt bank with a 12 volt controller Oops, thanks smac. The subject was "Charging a 36 volt bank with a 12 volt controller" and others suggested a 12 volt system combined with it. The Trollbridge36 would actually allow running at 36 volts and charging at 36 volts except when wanting to charge from the 12 volt charging source(s). It would not require an additional 12 volt battery. However if the 36 volt motor load is rated at more than 100 amps it would not be suitable. |
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