Eric-
I have driven 2 chargers with my EU2000i Honda successfully all day long.
It is critical to be able to adjust how much you draw from the Honda.as
example, plugging in a 20a, 36v charger only partially loaded the genset.
Adding a 28-amp 36v charger brought the genset to its knees and it quickly
shut down with the overload light coming on.
I removed one of my 4amp Vicor charger modules---same story.
I removed another one.at that point the Honda was able to steadily deliver
40amps into my 36v bank---i.e. 1440w continuous (to the batteries) was about
all the Honda EU2000i was able to deliver (probably 1.6kw to the chargers)
and is about spec.
SO no, you won't be able to plug 2- 48v, 20amp chargers in at one time
unless you can throttle one back.
-Myles Twete, Portland, Or.
From: electricboats@
On Behalf Of Eric
Sent: Sunday, August 16, 2009 10:13 AM
To: electricboats@
Subject: Re: [Electric Boats] Portable chargers?
Mike,
My concern is that if the charger(s) draws too much, the generator will
comply until overheated or failure. The best bad scenario would be the
generator shutting itself down before permanent damage occurs, but I don't
know if these units are that smart.
I don't think that you can hook 2 chargers up in parallel on one bank
because the chargers would trick each other into thinking that the bank was
more full than it is.
Because my boat has space and weight issues already, I am hoping to run 2
separate banks of 4 group 31s. One bank in the engine compartment, where the
engine is now and the other set into the top of the full keel space. My boat
has about 4000 pounds of concrete and steel scrap for ballast inside the
keel, accessible from inside the cabin. I hope to carve some of that ballast
out and make two sealed boxes that can hold two batteries each. If I'm
lucky, the second battery bank will break even on overall weight in the boat
and keep the weight where it is most effective.
With two banks, the chargers can run independently. If I install a 15A
charger one one bank and a 10A charger on the other, the 2000i should handle
it easier and I should get around 1200w of usable output to the drive. I
intend to be able to select either or both banks via relays so that I can
manage them better.
Still trying to figure this thing out... :)
Eric
--- In electricboats@
<mailto:electricboa
>
> Eric:
>
> It should be able to run the two chargers but, as you point out you may
run into the Scotty factor from Star Trek. "I can't make any more power
Captain" <g> The Honda coming up 80 watts short is not the end of the world.
But, as Merrick also pointed out you don't want to run things at max power
all the time either....
> But, I am curious about running two 48 volt Zivans in parallel with the
Honda 2000i. If it works it should give one a nice bump up in speed from
just one Zivan in operation as I have. This is because you should be
increasing the amount of amps available from the chargers for powering the
motor. Sounds like a good experiment for someone to do. While I think it
would be great for increasing amps available for motoring there may be some
issues with charging one good and one bad:
>
> 2) There could be a problem with second stage charging. The Zivan NG-1 is
a particularly sophisticated charger that measures the batteries and pulses
current as needed in the second stage of charging. The two chargers in
parallel could be fighting each other or getting erroneous readings if both
are in operation during charging. I think the problem could be easily solved
by shutting down one of the chargers during this phase of the charging
cycle.
>
>
> Mike
> http://biankablog.
>
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