Lead acid batteries with 48v 1000w controller HELP

[Pablo_1985]

Hí i had lot of problem with conhismotor, because i toast a regenerative controller because i used a lead acid battery pack, but since they told me there was no problem, now, weeks of continuous fighting later, and a complaint in paypal they are sending me a new controller (i paid 20usd just for the shipping). i have planned to keep using my batteries but i´m diactivating regen mode, i will enjoy my batteries until the day they die then i´ll buy a lifepo4 pack. But i don´t know why conhismotor is trying to make me think that i can´t use my lead acid batteries even with regen disable by confused emails...now i even not sure if i can damage my controller by using lead acid batteries with no regen!!, for me it doen´t make sense because if batteries are bad in this mode they just go to a low voltage, or low current, things wich can not break my controller...can it?!?! look to the emails...

Hi Barbara, could you tell me how high could be the regenerative current for this controller? Also i would like to know how much could rise the battery voltage when the controller is regenerating.

Regards

Dear Pablo

Get rid of the thoughts on using this controller to the Lead-acid battery.

I don't know either, I need check with our engineer.

I will update to you once I get it.

Best regards
Barbara

Hi Barbara,

I should get rid of using this controller with regenerative braking and lead-acid battery, not using this controller with lead acid battery at all, because i can deactivate regen mode. It is important you tell me the data i asked you, because in a future i will buy a battery pack, and i want to be completely sure it´s going to work.

Regards

Dear Pablo

If you use a 48V LiFePO4 battery with BMS, then there is no problem.

For 48V 1000W motor, you can choose 48V 20AH Li-ion battery.

Best regards
Barbara

Firstly there was any kind of problem by using lead acid batteries, now...don´t even think about it!!! what the hell with this people??? i am soooooo tired of this bunch of jerks! i have so many bullshit (really! i have more than a hundred emails!) that i am going to write a book wich named will be "Handbook for Being a Perfect Jerk, The Adventures and Misfortunes of Pablo"...

So, is there any problem in using my batteries with my controller with regen mode disabled?

Best regards guys

EDIT: by the way, anyone can answer to this?:
Could you tell me how high could be the regenerative current for this controller? Also i would like to know how much could rise the battery voltage when the controller is regenerating.

 

[icecube57]

I think its the simple fact that SLA batteries have such a high internal resistance that they cant accept the regen current that fast. SLA is can dump current like crazy but cant accept it that fast. you end up having an overflow of electrons waiting to get into the battery and they have to go somewhere in this case back to the controller. But by them telling you that a lifepo4 pack can accept regen was stupid of them to. You have to have a BMS that can accept reverse current. Ping packs dont accept reverse current. You would have fried you pack if you tried. Also. Some of the cheaper ebay battery vends wont accept reverse current through their bms. I dont know what to tell you. If you are using the controller i think you are using (All Black Regnerative Braking Controller) I would toss it and get an ecrazyman controller. The controller you have i think the regen is always on. But I think there is a jumper connecter on the outside of the controller to activate a deactivate regen.

 

[Pablo_1985]

i should advise what controller i have, i talk about it here, there people said what you say...when this controller die then i will replace it with an ecrazyman controller, but now i have to live with what i have, i am not a big fan of buying things when actual still works

My controller is black, and conhismotor said i can deactivate regen by putting a jumper in a connector on the outside...i know that SLA can dump current like crazy, but when conhismotor try to tell you thousand of times you are wrong you start having doubts...

Well i think i will use my controller with no regen until it break (could i hope a year!?), or i don´t know, i know that i don´t want to sell something wich could fail too soon, in a future i will talk with ecrazyman.

 

[fechter]

Yes, put another way, during regeneration, the voltage across your batteries can exceed the voltage rating of the controller and cause a failure. A really smart controller would limit regen above a safe voltage. Disabling regen is the safest thing to do.
Another approach would be to modify the controller so it does automatically prevent the regen voltage from going too high, but this could be difficult. Another similar approach would be to make a very large shunt that goes across the batteries and comes on at something like 60v. If the regen exceeded the batteries' ability to absorb the charge, the excess would be dissipated by the shunt. A shunt like this would require some really big resistors.

 

[Pablo_1985]

Things wolud not have to be that way...you buy a regen controller and if voltage rise too much, controller should be protected...it is a same, because when you see this things... it is just what make something grotty or perfect, and there is just a little gap betwen them, then you think why people prefer to make grotty controllers instead not making it...

I thought that i could change to 36 volts when regen, this way voltage would not rise too much...but obviously is not easy...are ecrazyman controllers protected to this kind of things? what could be go wrong with them? people talk so good about them the seems to be bullet prove!