[dane]

Regardless of the size of controller, you will only consume what you use. If you drive mild you will probably never notice the extra 100 amps. The larger controller will only come into play when you really get on it and are using 450 or 500 amp. When driving normal and only pulling 100 amps you'll pull the same 100 amps no matter the upper capacity of the controller.

Before purchasing four 100amp batteries I would do some research about the batteries and their charging. Starting with 4 batteries then adding 4 more later for more range is not much an issue with lead. Before attempting the same with lithium's you need to make absolutely sure everything (ALL batteries & charger) is compatible. Most lithium batteries have limitations on how they can be connected together. Some allow hooking them in series but not parallel while others allow both. And all replacement lithiums (the type of pre-packaged battery & BMS you are considering) have a limit on the number of batteries that can be combined.

 

[SGrem]

Yep...that's why I went with the Dakota....can scale up if use changes.

 

[Pottscb]

I’ve researched this, one way is to go with a larger module to begin with (48V-200amps in one enclosure w/BMS) then less chance you need to add more than 1-2 extra. Most battery BMS will say max 4s4p or 2s4p.

 

[Pottscb]

The battery management system (BMS) is primarily a charge controller and it does not limit the output current. Most LiFe have a max current load of 1c. The intermittent current can be much higher. It's one of the big benefits of lithium. So, that 1c (100a) you mentioned is for long term draws. For short term you can draw a scary amount of current. Luckily the motor controller I think is 400 amps so you won't be doing anything crazy.

When considering range you should get considerably more range with the lithium's if comparing batteries of the same capacity because they can safely be discharged further. So, everything else being equal you will get more range.

I’ve learned that BMS can be used for charging/output/or both and it will limit output to keep from overdrawing batteries if used on output (most limit to 100amp for 100Ah And 200amp for 200Ah). I have an aftermarket motor that requires 500Amp discharge burst (makes
a ton of startup torque) so I’m being careful with my battery choices…probably overthinking it but I don’t want a manufacturer denying warranty coverage because it was used improperly. Dakota and Renogy are some of the only companies that allow 300-600Amp draw unless I DIY LiOn packs from EVs (which is an option, but more complicated and has no warranty)

 

[200mph]

Guess you’re referring to Dakota Lithiums DL+ series batteries which are suitable for starting applications.

“DISCHARGE
135A max continuous discharge, 1000A max 2 second pulse, 900A max 5 sec pulse. The flat discharge voltage curve provides a 75% bigger capacity than a 135Ah SLA battery with the same CCA rating.”

 

[Pottscb]

Yeah, they make a 48V-60Ah that I could get my feet wet on…BUT THAT PRICE…as much as I paid for the used Gator!