Battery size help for bakfiets.nl cargo long bike and bafang bbs02

[AdrianKe]

I purchased a used bakfiets.nl cargo long bike and a bafang bbs02 48v 750w motor but am unsure of the battery size. We've got one steep hill and flat roads, will be transporting 2 kids (3 & 5 year old) and a baby. Our traveling distance will be on average 20km per trip with a max of 50km range on big excursions. What battery size do you propose we go for?

 

[Mysery]

Info on the total weight of everyone and everything would be useful. Going with what you posted though I would look for a battery of at least 720wh (15ah).

 

[Atavar]

Bigger is better.

 

[AdrianKe]

Just an update, I ended up with a 15ah battery, running at 48V. Our house is at the bottom of a steep hill so all trips start with a good 350-400m climb with a grade of about 10% if I remember correctly. Loaded with a weight of roughly 140kg (including person cycling) we get a range of 40-45km depending on assist level and your own pedalling effort. We tend to cycle quite comfortably without it being straneous excersise. Pull away is obviously not too fast but usually cruising speed is at 22-25km/h. I will most probably end up buying another battery for longer trips or swop it out with a 20-ish ah battery and reuse the original battery on a new build.

 

[m@Robertson]

I didn't see this thread when it originally came out but I would have given the same advice @Atavar did, and which you have figured out from experience: Bigger is always better. So long as you can fit the thing, at least. And especially on a cargo bike.

When you do the battery over again, consider doing an under-floor pack that is hidden under the cargo floor, so you can leave it when you park the bike at a shop. The increased convenience level is enormous. Here's how I did mine:

Larry vs Harry Bullitt Hill Hauler, Back-to-Front Part 3

In this installment we’ll spend all of our time looking at the battery box and the separate controller/charger box that are both hiding under the cargo floor.

talesontwowheels.com

 

[AdrianKe]

Thats a ni

I didn't see this thread when it originally came out but I would have given the same advice @Atavar did, and which you have figured out from experience: Bigger is always better. So long as you can fit the thing, at least. And especially on a cargo bike.

When you do the battery over again, consider doing an under-floor pack that is hidden under the cargo floor, so you can leave it when you park the bike at a shop. The increased convenience level is enormous. Here's how I did mine:

Larry vs Harry Bullitt Hill Hauler, Back-to-Front Part 3

In this installment we’ll spend all of our time looking at the battery box and the separate controller/charger box that are both hiding under the cargo floor.

talesontwowheels.com

Wow, thats a nice clean solution. At this point we need to remove the battery for charging because we dont have a garage or space near our home to park it (first floor apartment). But, when we move I am definately looking into this solution. Currently it is fixed underneath the back seat which is a fold up seat and the battery style is a haillong / frame mount battery with a lock.