Just_Ed said:
I need to know what ah you need for 48V or total kwh you need?
well, one set of 7 modules, as noted above, is potentially 3500wh (3.5kwh), depending on actual capacity of each used module.
but...if they're only 60ah when new, at an average 7.2v each, they're only 432wh max for each module, when new. if they're only say, 50% of original capacity, then you only get a little over 200wh each module. which, times 7, is only about 1400wh.
anyway, if you've only got space for one set, then that's how much wh you have, whether you need more or not.
if you have space for two sets, then you have up to 7000wh (7kwh) with the "500wh/module" number. if it's the 200-ish wh / module, then two sets gets you about 2800wh. three sets gets you 4200wh or so.
etc.
now, for how much you need...as i noted way back at the start of the thread, until you know the approximate aerodynamics of the vehicle you can't do much in the way of good estimations of power usage. also as noted, you can get the coast-down aero numbers with just the rolling chassis by having someone else haul or push you up to at least the speed you'd cruise at, then let it coast down to a stop and see how long that takes / how far it goes before stopping. then there are sites about testing aero like this that will help you figure out the cd / cda numbers plus the frontal surface area (which you can estimate as approximately a rectangle of the width x height of the vehicle) you can use to plug into various calculators for power requirements at various speeds.
you can use the power estimates from my somewhat similar-shaped and similar weight sb cruiser trike, but i only have data for up to 20mph, and really only on level ground. for mine, it takes up to 70wh/mile to do 20mph max, which with my ~2kwh battery gives me around 30-ish miles of range.
i would extrapolate that if i could do 25 here, it'd probably take about 100wh/mile for something as unaero as my trike (possibly more).
so, if i needed the same 30 mile range, it'd take 3000wh battery to do it, assuming my untested assumptions are correct about my aero.
if your vehicle's aero is similar to my untested assumptions about my trike's aero
and if yours does then take about 100wh/mile at 25mph, then if you need only 30 miles, and those leaf modules do have a minimum of 500wh each, then the seven you've planned for so far would have enough capacity to do what you're after. but if they're more like the 200wh/each, it'll take at least three sets to do it.
if you need any more range than that, or if your wh/mile power usage is sufficiently worse (higher) than that for whatever reason, or the modules don't actually give the wh stated, then you'd need more sets of 7 to parallel with the first sets
fixed the diagram in the previous post now, and the text in the post to match.
