2. Big red1800's size on my workbench/ charging station is not an issue. At say 100 watts output, it is more efficient than any of my other boosters. Its voltage and current trim pots are less twitchy than any of my other boosters, and I have not used any of my other boosters again yet to charge my esk8. I basically roll once in the late morning and again in late afternoon so two charge cycles a day. The evening charge I slow charge to reach ~ 41 volts by the time I expect to goto bed, and in the morning I will dial it to 41.8 to 42 volts and just crank 200 watts or so output so that by the time I am done with coffee less than 0.2 amps are flowing, and we roll to the parks.
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I would love to modify Big red to sit inside a ventilated casing with a large Ammeter and voltmeter and Ah/watthour, columb counter, and have two finger twist potentiometers to dial in output voltage and amperage as desired.
But, that is unlikely to occur anytime soon.
I will just keep using my inline wattmeters and adjust voltage and amperage by the small trimpots. I did acquire a Bourns potentiometer screwdriver to make it a bit safer and easier to dial in those potentiometers to my desires.