Mike-
That 900 + 720w = 1620w…if the chargers actually try to deliver that much in DC, their AC input would require at least 1700w. The EU2000i might manage this or might not. It'll be close—but then, that's only if all these were max'ed out. Here's what will happen if it goes over: The generator will shut down due to overload. Your recourse? If you can't throttle back a charger, then you'll have to be able to physically remove one or more of your chargers---so be prepared to do this!
I tried plugging a 20amp and 25amp Lester 36v golf cart charger into my EU2000 only to have it overload.
Similarly, plugging in the 20amp Lester and a home-made Vicor supply that dished out an additional 28amps failed. So I pulled out one of the 4amp modules---at 24amps plus the 20amp from the Lester, the genset ran for a minute or so, then shutdown. I had to pull out one more 4amp module before it wouldn't groan under the load. In the end, I could get about 40amps into 36v steady---i.e. about 1440watts continuous, all day long. As the Vicor is about 85% or better efficient and the Lester, oh, perhaps 80%, I figure the genset was putting out nearly 1700watts or so. So this is just a warning.
-Myles
From: electricboats@
Sent: Wednesday, May 19, 2010 9:21 AM
To: electricboats@
Subject: Re: [Electric Boats] QUAD BATTERY CHARGERS FOR A 48 VOLT BANK
Thanks Arby & Chris for the replies. I'm going ahead and will be ordering a Dual PS4 for the boat. Good to know they have good customer support too. BTW I found out this charger works for flooded and AGM''s if you are using Gels they need to provide an different charge curve voltage when you order. I understand that the DUAL PRO may not work as I expect in my powering experiment and certainly thermal shutdown is a possibility but, it's worth a try. My Zivan NG-1 can push my 30 foot 8 ton sailboat along at just under three knots with it's 16 amp output. It is maxed out at that point. If I can then start to draw down the battery bank a little and then power up the Dual Pro which can add up to an additional 15 amps to each battery in the bank I am hoping I can get a few more amps to the motor without drawing down the battery bank. I may not be able to get the full 15 amps from each output of the Dual Pro because of the thermal shutdown issue Arby mentioned. But an additional say seven amps on each battery could add up to a nice bump up in current (in theory). The 900 watts from the Zivan and the max 720 watts from the Dual Pro should be within the power capabilities of the 2000 watt Honda (again in theory). I'll report back on how it goes. But, even if it does not work out as I expect at least it should be better able to balance the battery bank and at the same time have a backup battery charger for the boat. I look at this as probably the last addition that I will need to make for my electric propulsion system. Capt. Mike
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