Chris,
I can give you some figures similar to what you have in mind. My mate Neil recently setup his cat with 48v LiFePo4 batteries and a 48v diesel genset and I was just talking to him now and got some data from him.
The installation is a few months old now and here's some of the figures...
He has a 60 ah LiFeTech battery pack and the genset peaks at about 5600w. If the pack is flat it takes about 20 minutes to bring it up to full charge and for most of the charging the genset runs at about 115 amps. This rate of charge is about is just under 2C.
He has two Cruise 4 Torqeedoes and running at full throttle they can draw 10,000 watts in total. He can use full power for about half hour or so with power from both genset and batteries. To be able to motor continuously he can just reduce the throttles on the Torqeedoes to match the 5600w of the genset so the battery drain is zero.
He finds a sweet spot running the Torqeedoes at about 2000 watts (ie 1000 each) and this allows 3600w going to the batteries. This soon charges the batteries and he can shut the genset off for a while and run the batteries. And so on.
The installation is here in Australia on the sunshine coast and he has used a genset from local manufacturer Watts2c http://www.watts2c.com.au/
Cheers
Chris
On 28/08/2010, at 5:10 AM, Chris Witzgall wrote:
Consider a 4000 watt diesel generator – what kind of sustained charging into a 48v LIFEPO4 pack do you think we could manage?
Chris
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