the boost will not go on forever, as i'v found out , but i did not try varing the pwm frequency
a 6V battery(or alt) won't boost up to 36 V at the present pwm frequency (~19khz), but it wii boost to 25V
i'm sure if i used a inductor wound on a ferrite core that i could have got better efficiency
but i just used what i had on hand which was one of my new coils for the minigen , air core.
i was able to vary the donor batterys current in steps of .1A from 0.1A to 1A after that i increased the current in steps of .5A up to 4A
again it is kind of hard to nail down a reading because the recipient batteries voltage is rising while the donors volts are decreasing , but i tried my best
Output......Input
I , Volts - I , Volts
0.02 , 25.46 - 0.1 , 6.18
0.04 , 25.54 - 0.2 , 6.13
0.06 , 25.54 - 0.3 , 6.10
0.07 , 25.55 - 0.4 , 6.09
0.09 , 25.62 - 0.51, 6.02
00.1 , 25.61 - 0.6 , 6.01
0.11 , 25.72 - 0.71, 5.96
0.13 , 25.67 - 0.81, 5.95
0.15 , 25.82 - 0.94, 5.84
0.15 , 26.18 - 1.0 , 5.84
00.2 , 26.54 - 1.5 , 5.71
0.21 , 26.59 - 1.66, 5.68
0.24 , 26.97 - 2.03, 5.5
at this point i should mention that the donor battery is a small 4AH 6V sla battery , which i recently brought back from uselessness
0.26 , 26.95 - 2.40, 5.44
0.26 , 27.00 - 3.0 , 5.27
0.23 , 27.10 - 3.51, 5.07
0.19 , 26.87 - 4.0 , 4.87
well thats my data
the efficiency peaked at 83% way back when the input current was 0.3A
but for an air core inductor i think it did not do too badly
the efficiency was still 51% at 7watts output , when the input current was 2.4A
... seven watts is not a even close to a kilowatt ,i realize .. and i know for sure Oztules has done much better
speaking of Oztules , where is he?
when the weather gets nice down under we dont hear fron him?
it still sort of amazes me that it was still boosting at 4.87V input , with a better inductor i'm hoping for a couple hundred watts