Vruzend kit 2.1, good enough?

[rhysgittoes]

Hi there,

I'm about to buy a Vruzend 2.1 Half and Whole kit, with their charger and BMS for a 14s 3P homemade battery powering a BBS02b. It's my first ebike, and although I have experience with RC power systems, and a mech engineer i'm a bit nervous as many people on the forums have said not to skimp out on the battery.

The reason for DIY'ing was to reduce cost - Cells = 100 pounds, Kit including BMS and charger = 150 pounds, so 250 for a 52v 9AH battery.

I'd build a enclosure around the battery and heat shrink it to reduce damage, would this be enough for delivery cycling?

If not - Where's a good website in the UK selling ebike batteries (people said dont go foreign for batteries)

Thanks so much for the help

Rhys

 

[Hickbeard]

Hi there,

I'm about to buy a Vruzend 2.1 Half and Whole kit, with their charger and BMS for a 14s 3P homemade battery powering a BBS02b. It's my first ebike, and although I have experience with RC power systems, and a mech engineer i'm a bit nervous as many people on the forums have said not to skimp out on the battery.

The reason for DIY'ing was to reduce cost - Cells = 100 pounds, Kit including BMS and charger = 150 pounds, so 250 for a 52v 9AH battery.

I'd build a enclosure around the battery and heat shrink it to reduce damage, would this be enough for delivery cycling?

If not - Where's a good website in the UK selling ebike batteries (people said dont go foreign for batteries)

Thanks so much for the help

Rhys

Hi Rhys.

I was looking at the vruzend kit and ended up using agnisium setup from 18650.lt

I was able to 3d print the holders myself to keep cost down.

Not saying they're better than the vruzend. Just another option.

I'm in the UK and got my batteries from queen batteries. We'll packed, OK delivery, think they came straight from China. Would reccomend them.

Sent from my CLT-L09 using Tapatalk

 

[MadRhino]

For delivery?
Unless you are doing light weight deliveries in the close neighborhood, or few of them, your should target a long range or fast charging, or both. My advice is to prepare building a second one, cause you are very likely to need it.

Good batteries are expansive, but they are the first priority. The limits of your bike, speed power and range, are first set by its battery performance and capacity.

 

[rhysgittoes]

For delivery?
Unless you are doing light weight deliveries in the close neighborhood, or few of them, your should target a long range or fast charging, or both. My advice is to prepare building a second one, cause you are very likely to need it.

Good batteries are expansive, but they are the first priority. The limits of your bike, speed power and range, are first set by its battery performance and capacity.

Most I ride is 35km, so with some pedalling the bike calc reckons 9Ah is just about enough. Might build a 10Ah instead. Do you reckon building it using the Vruzend kit will be a good choice?

An oem LG battery is 300 quids but only 48V, would that be a better choice since it’s my first battery.

Cheers and thanks for the input.

Rhys

 

[999zip999]

3p? Is a small battery 4p or 5p. Less stress and your battery will last longer do not use your battery at its limits do not drain your battery to cut off. that is not the purpose of the BMS it's just in case.

 

[maanebedotten]

Dont forget that calculated range does not take into account starts/stops. Depending on your riding environment and style you might only get half of the calculated range.

 

[AngryBob]

AH capacity of the battery will decline over time. If you need a minimum of 9AH, and that is a guess from a simulation, I would start with 12 at least, 15AH would be better, unless you want to replace the entire battery every year or two.

The Vruzend kits are poorly engineered. They rely on a pressure fit, which needs to be evenly distributed AND consistent across all cells, which their system does not do. IF you use the bolts and IF you buy extra bolts and IF you mount a rigid board on both sides and IF you put a poron foam blanket under each board then you MIGHT have something that COULD come close to being as reliable as a well-designed kit. Don't forget whacking it repeatedly with a large wooden mallet, absolutely my favorite assembly video ever.

The NESE kit from Agniusm has been tested for consistent connections while mounted in a device which resembles an industrial paint-shaker. No way the Vruzend kit survives such a test.

 

[markz]

https://endless-sphere.com/forums/viewtopic.php?f=3&t=107270#p1571954

it is a Vruzend (mistake)

 

[docw009]

The Vruzend kits are poorly engineered. They rely on a pressure fit, which needs to be evenly distributed AND consistent across all cells, which their system does not do. IF you use the bolts and IF you buy extra bolts and IF you mount a rigid board on both sides and IF you put a poron foam blanket under each board then you MIGHT have something that COULD come close to being as reliable as a well-designed kit. Don't forget whacking it repeatedly with a large wooden mallet, absolutely my favorite assembly video ever.

I'm with Angry Bob on this topic. While I never seen a Vruzend in real life, there was a good reason why it's at Ver 2, and I think they need to jump right to version 4. i.e, kill it off.

 

[AngryBob]

Depending on how you count, they are already on their third or fourth re-design, and it still ain't right.

Apparently their US warehouse is actually in my home town, been meaning to stop by and take a look, but there really is just no point to it.

 

[markz]

When you say US warehouse, you mean a double garage?

Depending on how you count, they are already on their third or fourth re-design, and it still ain't right.

Apparently their US warehouse is actually in my home town, been meaning to stop by and take a look, but there really is just no point to it.

 

[AngryBob]

It's actually in a light industrial area, usually small shops or mini warehouses, which are often approximately the size of two garages end to end.

So, yeah.