Golf Cart Battery Bank?

[augiedoggy]

I have a golf cart with a pretty large battery compartment. It currently has 6x 8v lead acid.

An idea I am pondering is replacing the exiting batteries with a DIY 320AH 48v Lifepo4 battery pack, and making it accessible as the battery source for a home backup inverter (similar to the F150 Lighting concept)

Has anybody done something like this?

View attachment 162568

Ive converted a couple golf carts and a riding mower so far..
On my 93 yamaha g8 it was originally a 36v cart. I converted it to a 48v lifepo4 pack and installed a 355 solar panel as the roof panel which allows me to never have to put it on a charger.. It charges the pack with up to 7amps in the sun. The lowest ive ever run the pack down was 41% and it was fully charged the next sunny day so.
I only used 86ah catl cells but even with that my estimated range is like 30 miles so unless yours is mainly going to be used for the inverter the huge ah cells your considering are overkill.

I use the 300amp continuous /600amp peak JBD BMS which uses a 500a rated relay actually designed for EV use.

I also used 200amp Jk bms in a smaller 36v build with 74ah cells for my inlaws.

Im currently building 2 72v 64ah packs to use in parallel in the G8 mainly for fun since I can increase the speed to close to 30mph this way and I got the nmc samsung/bmw and fiat 500e packs cheap on the hookup. Ive read the 36v motor can handle this with no issues if not abused.

I have experimented with different mppt boost charge controllers and am using a different one than pictured below now. The lithium batteries are vastly superior in performance to lead acid because they have a flat discharge curve and dont suffer from the peukart effect.

most use the 200a jk bms with 2a active balancing or the jbd like I mentioned above but there are a lot of ANT and daly bms packs out there with a high failure rate like the now defunct"extreme team" used to sell.
Last pic was the cart As I bought it for $700 last fall.

 

[augiedoggy]

Did Roypow fix the BMS tripping problems? Last time I was active in the golf cart forums, they had a lot of problems with their BMS's tripping.

Specs on most golf cart batteries are 100 amps max discharge.. but if you put two or three adults on a car and head up a hill at full throttle, you'll be drawing a lot more than 100 amps... more like 150 or 170.. and the RoyPows were tripping because of it.

The specs on most golf cart lithium batteries are actually higher than 100amps... Most 36 of 48v packs that are meant to be run individually output at least 150amps continuous and much more peak.. A lot of folks in the golf cart forums like buggies unlimited unknowingly buy 4 12v solar storage batteries sold to them by someone marketing them for golf carts and run into bms shut down issues as a result.

Most packs sold for use in carts are 105ah or less.. 105ah can easily go 40 miles in an ac cart.part of the upgrade is shedding the weight of the lead acid and with huge cells you lose that advantage.

 

[raurre]

I have 230 ah cells with a 300 amp bms . It has a top speed of 35mph and has about 100 miles of range if you drive with efficiency in mind. My cart pulls 200+ amps at a full throttle standing start. When it is connected to my solar it is doing very light duty in comparison. Here's the video I have of the cart.

 

[augiedoggy]

Mine will pull about 155amps for 1 second if I floor it at a stop. not sure yet how much that will be effected when going to 72v.