questions regarding batteries and the x1 gen 4

[lilium]

Hi there, new to the website but i had some specific questions regarding battery setup for the x1 gen 4 pro.

trying to make the dream build with the gen 4 x1 motor, and running appropriate battery for them is making my head spin.
SO the bike i wanted to build ontop of cannot support a big battery on the frame and I cannot backpack a huge 40-60ah battery. I was considering running parallel twin 72v batteries to support the high wattage, but im wondering what are the dangers in doing so and what precautions I can take to prevent battery damage. I'm dreaming of using two 72v 20ah 80a bms batteries, but im wondering if just one battery would be enough? I want to be doing at least 30 miles of range, and i understand the real world applications of using weight, riding style, terrain makes it difficult to speculate it. But the city im living in has very mixed terrain with lots of hills and bridges and my weight would fall closer to 400 lbs with the weight of the bike. i just hate doing 5-8mph up the steepest hills with a hub motor, so i want to try this new powerful mid drive but i want to get enough range since i was already suffering with my 52v hub motor. personally im not too much of a high speed guy, so i believe i would normally run this motor at 2k-4k watts. what do yall think?

 

[amberwolf]

You would first need to at least guesstimate actual power required to do the job you want your vehicle to do, under your specific riding conditions, terrain, speed, weight, weather, etc.

Once you define those riding conditions/etc. fior yourself, you can use the various calculators and simulators around the web, such as those at ebikes.ca, kreuzotter.de, etc., and then use that power to guesstimate the minimum worst-case current A required at the voltage you want to run.

Then you can tell if the system you want to use will do the job you want or not, and if not, have a basis to go look for one that might.

You can also use the power to guesstimate the minimum worst-case watt-hour Wh capacity to get the range you require.

Then you can look for batteries that can handle the power, current, and voltage you need, and have the capacity Wh required.