brulaz wrote:
BFL13 wrote:
...
Improving the pos path will get me about 28 amps instead of 26 amps.
Maybe the only way you will improve upon that is by up converting (dc-dc) or up-down (dc-120VAC-dc) so you get 14.8V at the house battery.
^^^THIS^^^
As stated multiple times, there is no real "gain" to be had by fattening up the DC wire alone and using a vehicle engine alternator which is coupled to the starting battery.
I didn't need any tests to tell me this, it is pretty basic "electricity 101" that Tesla had figured out when he proposed an AC distribution system was more efficient than Edison's DC system.
If Edison would have won, we would have needed DC generator systems placed every few miles and only major cities that could afford to buy generators would have power leaving out a vast amount of population in the dark today..
Changing low voltage/high current 12V DC to high voltage AC/LOW CURRENT then running 120V light ga wire back to your converter which now changes the high voltage/low current AC back to low voltage/HIGH CURRENT 12V DC will vastly improve your wanted outcome without all the heavy wire and cost of such wire.
It IS the main reason that we to this day use a AC power grid distribution system..
A 2A "gain" is peanuts and might shorten your charging routine by what, a whole 5 minutes if that.
Inverters are extremely cheap now days for the wattage and you already have a converter so really all you need is the inverter (1500W for good measure) with a couple of feet of heavy 1/0 wire to feed the inverter..
I personally would skip the DC-DC "boost" setup, for the cost of the boost you could buy the inverter but you would still want to upsize the DC wire for best results.. Large ga copper wire is not cheap and it is hard to deal with.
