@P-hack:
I don't know why you continue to try and defend the one sided biased ... any situation position ? ... it's incorrect.
Depending on the situation the pusher might be better ... and in different situations the generator will be better ... what is so bad about it depending on the situation?
Quote:
Originally Posted by P-hack
1. the pusher pushes regardless of the SOC. If you need to pass BSFC for more power in extreme circumstances then so what. No advantage of series here.
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As has been said.
Past a certain point in the BSFC the Pusher reaches a lower minimum efficiency from tank to road.
This is true to either more power or less power.
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as has also been said ... the inverse is a pro of the pusher ... it will have higher peak efficiency as the generator tops out sooner... but this does not remove the low efficiency situation from existence.
Quote:
Originally Posted by P-hack
2. some measure of series when you add an alternator to pusher, can size for continuously running fans/compressors/lights, but pusher has most of the power go straight to the wheels. Series only has no measure of parallel, series loses.
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Adding alternator to Pusher = Combined Pusher / Generator.
Thus it admits the situation where the generator is better than just the pusher.
( the guy in the 120+ degree hours of grid lock traffic will appreciate having the generator option for his Air Conditioning ... the guy next to him with only a pusher ( and no generator ) for his BEV doesn't have his and as he sweats into dehydration , will look enviously at the guy sitting comfortably with the generator. )
Quote:
Originally Posted by P-hack
3. It's a dessert topping, it's a floor cleaner, not relevant to the discussion of range extending, nor a typical situation requiring constant loss of efficiency.
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The current discussion left 'typical situation' when you went to the extreme of ... not in any situation ... post #198.
As long as you insist on trying to defend this absolute ... not in any situation ... position ... sorry , you're incorrect.
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What is 'typical' will vary from person to person ... context to context ... and sense each does have pros and cons ... and sense neither one is the best in all cases ... depending on what that 'typical' is ... will determine which is the best fit ... it could be the pusher ... or it could be the generator.
Quote:
Originally Posted by P-hack
Not even sure the tzero generator makes 120v@60hz.
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It didn't ... it's generator was DC output.
But that doesn't effect the far more wide claim you made in Post #198 and continue to try and defend ... about what is ... inherent ... to the two systems ... DC output is not inherent to the generator ... it could have been wound as AC ... or I could already have DC appliances in my home to use the DC ... or I could use a DC-AC Inverter ... Those are all options that are not possible with just a stationary pusher... thus the pusher has less utility... and the generator will out perform it in that situation.
Quote:
Originally Posted by P-hack
4. pusher = 4wd, series loses (and pusher has redundant powertrains)
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All the wheel power the pusher makes will be limited to the friction it has from the 1,100 pound down force ... that was the weight of the pusher trailer referenced earlier in this thread.
The higher down force of the 3,100 pound BEV it is pushing will loose traction less than the 1,100 pound pusher trailer ... be it up hill or slippier surface ... As long as it is the Pusher that is doing the pushing ... zsnemeth is correct ... it's wheel will spin sooner than if wheels of the heavier BEV getting power from a 300 pound generator would.
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#5> Pusher referenced = Increased Rolling Resistance
This does bring up another good point though ... the pusher trailer is heavier ... almost 4x heavier ... thus it will increase the net combined system rolling resistance more than the lighter generator would... thus more power will be needed to sustain any given speed , due to the increased rolling resistance.
In this case ... the proposed pusher would have about ~20% more rolling resistance... that might vary with other designs ... but it will be difficult to get the pusher weight bellow the generator ( without also picking up additional drive train losses as the pusher tries to deal with all vehicle speeds and loads. )
And if one tried to make the pusher trailer lighter to reduce this #5 con ... you only serve to increase the #4 con of having less down force for friction on pusher trailer wheels.