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Lithium Iron Phosphate (LiFePO4) Batteries
12-23-2014, 14:26 (This post was last modified: 12-23-2014 15:01 by travelite.)
Post: #17
RE: Lithium Iron Phosphate (LiFePO4) Batteries
Hi Greg,

The Yamaha is phenomenal technology and it seems ideal for your application, but I can't help thinking that it's really meant to be used without an external inverter or battery bank. Also, these smaller gasoline systems rarely beat Powertech at fuel consumption. I do see benefit at very low rpm use at almost zero load, sound levels, weight and form factor; you're not likely to find space for a 15KW Powertech in a GMC. Yikes! Nonetheless, it's interesting to compare efficiency.

Here's some Powertech fuel consumption figures I gathered:
İmage

From the Yamaha manuals I've gathered a fuel tank of 4.5 gallons and a run-time at full load of 7.4 hours at rated output of 4KW and 15.2 hours at 50%:

7.4 hours at 4KW: 0.61 GPH
15.2 hours at 2KW: 0.30 GPH

Without doing a bunch of extrapolation, from the 15KW Powertech numbers we see that 0.33 GPH gives 3.75KW and 0.67 GPH gives 7.5KW. I think that it's safe to assume that at outputs of 2KW and 4KW the Powertech fuel consumption numbers would be even better.

david brady,
'02 Wanderlodge LXi 'Smokey' (Sold),
'04 Prevost H3 Vantare 'SpongeBob'

"I don't like being wrong, but I really hate being right"
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RE: Lithium Iron Phosphate (LiFePO4) Batteries - davidbrady - 12-23-2014 14:26



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