Metroboard DIY upgrade

DIY Builds
#21

OK… I have battery specs and enclosure sorted thanks to ilan. Now I’m just trying to work out which bms to use. Ilan recommends a charge and discharge BMS but was unable to supply one. Here’s the battery specs I got;

  1. 10S4P PACK 2) LG MH1 - 3200 MAH 18650 CELLS (10 Amp Continuous Discharge) 3) PACK and BMS must be able to handle 25 Amp Continuous / 50 Amp Peak Discharge 4) PACK and BMS must be able to handle 5 Amp Continuous Charge 5) Pack must have low power discharge electronic switch that enables discharge by connecting two wires together (as described on next page). Note that charge should always be enabled regardless of discharge switch state. 6) See additional requirements on next page.

I’ve been reading about the discharge BMS issues and loss of downhill braking when fully charged. Is there a way to avoid this? I think I read that some types of bestechs are better for this but I quickly got lost in the technical specifics.

Anyone able to recommend one?

#22

Yes, avoid Bestech (or litechpower as their distributor is known) as I’ve had not stellar experiences with them lately. Daly for the win

Bypass configuration:

use “20A36V Common Port” model

Discharge configuration:

use “60A36V Separate Port” model

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#23

This is more a problem in theory than in practical use.

Do you live or work at the top of a giant hill? If the answer is no, don’t even worry about that.

#24

Roger that. Thanks for the quick reply. I’m talking to a local battery builder here in wa (Marsen) so I can flick him your diagrams.

Many thanks.

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#25

Could someone please help me out looking to get more acceleration and a good launch of my metroboard xo

#26

Which metroboard? Got a pic of the underside?

If you’re not concerned about top speed, you can probably do that with smaller wheels OR a larger wheel pulley.