Thinking more about it - connecting a power supply to a battery (especially a high current lithium battery) could be bad from both directions: 1) If the battery voltage is LOW, then there would be potential for a huge "spark" when they're connected. 2) Depending on the design of the power supply - if the battery voltage is still HIGHER than the power supply, would you blow up the final stage of the power supply.
Maybe at least a fuse, a BIG diode, and possibly even a current limit resistor? But then you're getting back to something that might look a little more like a dumb charger?
So, what's the best way to set up a hybrid configuration with a generator, a charger, battery, and motor?
Option 1) Are there good 10-20A 48V battery chargers available at a reasonable price (no more than $300? is that unrealistic?) so that the generator could drive the battery charger, and the battery charger would charge the battery while powering the motor? Can the charger handle having a motor draining the battery as fast as the charger is dumping current into it?
Option 2) A different way to run off the generator might be to run the generator into a 20A 48V switching power supply, and drive the motor directly from the switching power supply, with no battery connected.
In that configuration - when you went from battery power to generator, the motor would switch entirely to run off the generator; the battery would be switched out, and charged (maybe in parallel to the power supply driving the motor) separately.
Option 3) Would it work to have the generator drive the 20A switching power supply into a MPPT charge controller that fed the battery - then leave the motor connected to the battery?
Thoughts?
John
On Wednesday, October 30, 2019, 04:32:29 AM CDT, oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
I've seen 48V, 20A (1000W) DC power supplies for around $80. Is there any reason NOT to run one of those off the generator, connected to the battery bank, to extend range?
The only concern I can think of is that if the battery bank is low, and you suddenly connect it to a 48V supply, bad things could happen. If there's a fuse between the power supply and the battery, hopefully the fuse would blow before anything toooo bad??
On Tuesday, October 29, 2019, 06:54:39 PM CDT, bob jennings sabre281@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
When I motor with the generator on seems like I do not get alot out of my Dual Pro 4 charger that chargers each battery independently in order to extend range. So I was thinking of adding a 25 amp Quick Charger because it charges the whole string in series.
For those that have motoring down pat, do you charge in series with your generator & how's that worked out for you far as extending range without depleting the battery bank?
Thanks,
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Posted by: oak <oak_box@yahoo.com>
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