On 9/4/19 10:39 PM, Lee Hart via EV wrote:
Lawrence Rhodes via EV wrote:
Is it possible to use individual chargers and no BMS on discharge?
It's possible. It will work, as long as nothing goes wrong. The trouble
is, something *always* goes wrong, sooner or later. Why? Because we keep
using batteries until they fail.
I have a neighbor that copied a commercial golf cart conversion product.
He used 11 S 100ah LFP (~3.4v) cells. Even though 12 cells is
normally considered "36v". That is, 11 chargers. Which were pretty
expensive; I think he ended up paying ~$20 each. He's been running it a
couple of years with no trouble. So far. I think he checks charged
voltages regularly to make sure the chargers are working.
If none of the individual chargers fail, then the cells will start out
fully charged. But when a charger fails, how will you know it?
On discharge, how will you know when the first cell goes dead?
There are some pretty cheap cell monitors available. ~$2 each, as I
recall. I think my neighbor just checks voltages before charging.
I have been using massively parallel ~4ah salvage hoverboard batteries
in my 36v golf cart for several years with good results. A box of 8 HB
batteries will run the cart ok. I am running four boxes right now.
Range with 4-5 boxes is 15-20 miles. Being parallel, it is VERY easy
to add or remove boxes. Everything is connected with SB50 splitter cables.
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