I started a upgrade on a razor drifter.

Nogogokart

1 mW
Joined
Feb 9, 2022
Messages
13
I started a upgrade on a razor drifter. I installed a my1020 1000 watt 48 volts motor. With a new 1000 what 48 volts topro yk31c controller. With 4 new mighty max 12 volts 22 a/h gel series battery. It seems to run good on blocks. But once you sit on it it might go 3 feet. Any ideas. Please help thanks chris
 

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Nogogokart said:
I started a upgrade on a razor drifter. I installed a my1020 1000 watt 48 volts motor. With a new 1000 what 48 volts topro yk31c controller. With 4 new mighty max 12 volts 22 a/h gel series battery. It seems to run good on blocks. But once you sit on it it might go 3 feet. Any ideas. Please help thanks chris
 
Nogogokart said:
I started a upgrade on a razor drifter. I installed a my1020 1000 watt 48 volts motor. With a new 1000 what 48 volts topro yk31c controller. With 4 new mighty max 12 volts 22 a/h gel series battery. It seems to run good on blocks. But once you sit on it it might go 3 feet. Any ideas. Please help thanks chris
 
The battery is probably sagging to the controller's low voltage cutoff level when you put it under load. What battery are you using, and what condition is it in?
 
people see it fine. you just need to learn patience. when someone that can help has time to help, they will, unless you drive them off.
 
Gee. Pulling 20+ amps ( 1000 watts / 48 volts ) out of brand new 22ah lead acid gel batteries, I'd expect you to get at least 10 feet!
Seriously though, you can get 1 amp for 22 hours out of them but you can't get 22 amps for 1 hour. Peukhert effect. Your batteries are sagging below the controllers low voltage cutout as soon as you apply any load.
And yes, many of us saw your post the first time.
As always, wise words from Amberwolf.

AussieRider
 
Nogogokart said:
4 brand new mighty max 12 volts 22 a/h gel series battery.

The first thing with a new set of batteries is put them all in parallel and charge them, or charge them fully individually, then put commect them in series and connect your 48v charger and make sure they all peak at about 14.4v - 15v during absorption and then 13.6v - 13.8v each when the characters drops to float.

If new and balanced, With 1000 watts load thats 20a, and those cells will sag but not below the 42.5v Lvp the controller has for a while.
F369BD81-B4B4-4CC6-9FB1-5C3AC0D2B0D4.jpeg

Under 20a load, your 48v battery will instantly drop from 52v to 48v, and then after about 15-20 minutes will reach LVP. But only if all 4 batteries are full charged. If one is not then it will drop below LVP in about 10 seconds.
ECE305D3-D959-4996-B47B-87E2E68870BC.jpeg

If the batteries are mew and balanced then a bad connection might be a problem. As already suggested you can put a voltmeter at the controller battery + and - and see what’s happening as you slowly and smoothly increase throttle under load.
 
Update I went and bought a new charger. The one I had was 30years old. All 4 batteries show 80 % full. I have charged 2 and I have 2 to go. Then I'll start testing
 
G'day Chris.
Your gearing looks way too tall to me, something like 4 or 5 to 1? If you can change that to say 10 - 14 to 1 you'll reduce the load / current draw especially on start off. Shorter gearing will give more torque at the wheels for less amps. Top speed is reduced, but since you can't go more than 3 feet now, you haven't got a top speed yet! With such a high CG, you wouldn't want to go too fast anyhow.
Keep at it mate.

AussieRider
 
Nogogokart said:
Update I went and bought a new charger. The one I had was 30years old. All 4 batteries show 80 % full. I have charged 2 and I have 2 to go. Then I'll start testing

As long as the charger is compatibility with your batteries and you dont use equalizer charge on them because it will ruin sla batteries.

Sounds like you have a 12v charger. Do you have the 48v charger needed to charge it as a pack? If not after each use you need to fully charge the battery one by one.


Your charger needs 6a for CC and 14.4-15.0v for CV. Then when CV amps drops to about 0.2a, it should go into float where it can sit happy for years.
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I have an electric scooter that uses the same batteries and they need to be checked often if charging as a pack because one weak battery will cause the others to overcharge.
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So of you have rhe 48v charger just check then as they charge the first time and then periodically after that you dont want the highest one to go over 15.0v for long,
 
Nogogokart said:
So with these batteries I will only have 15 to 20 minutes of run time

Yes, at full throttle, 1000 watts, 20a, you might get 15-20 minutes till it hits low voltage protection. And thats if you want to go below 50% depth of discharge, which decreases cycle life exponentially.

I’m making a LiFePO4 battery with 100x 32650 5500 mah cells in a 5p20s configuration, that will give 64v nominal 27.5 ah to replace the 60v 23ah SLA batteries.
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It will be half the weight and have about twice the range, and a lot easier to care for.

But if you want ultimate energy and power for a certain volume or weight limit. Lithium Ion is the way to go.

I went with LiFePO4 because its cheaper, safer, and uses no welding or soldering. If i get a bad brick i can take it apart, test those 5 cells, replace the bad one and bolt it back together. With lithium ion those are almost all spot welded and replacing one cell is a lot more work.
 
:shock: OMG I think an eye opening lighting bolt just hit me on my head. I probably should have gone with gas. Lol too late to switch directions I am in it for 500.00 and my grandson can only go 3 feet. If I can get it to run for 15 minutes at least I can save face. So what are you making that lifepo pack for. Looks good
 
Nogogokart said:
:shock: OMG I think an eye opening lighting bolt just hit me on my head. I probably should have gone with gas. Lol too late to switch directions I am in it for 500.00 and my grandson can only go 3 feet. If I can get it to run for 15 minutes at least I can save face. So what are you making that lifepo pack for. Looks good

Lol. Gas is probably less headaches than lead acid batteries but lithium batteries with BMS are very trouble-free. I bet you have a cordless drill with lithium batteries and wouldn’t trade it for a drill with a 4-stroke RC engine with a tiny pull cord. Lol. But that would be a cool novelty item. Lol

Im making it for this scooter which has a Votol EM-30 controller.
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This was my first version, 20s5p.
 

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Later i was able to make 20s6p by making custom hexagon cell holder out of 3mm thick polycarbonate
 

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Then I had the Frame sandblast and powder coated.
 

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Hello Nogogokart where do you live ? As there are good lithium lifepo4 resale. Just ask us about the batteries before you buy them.
How about 12 of these or ? I have a 20s 1p that gets 8 and 1/2 ampere hours at 40 amp controller. No BMS I just have balance wires on it and don't go below 62 volts. And they always stay balanced with a bulk charger I just have four five inch balance wires if I ever need to balance one of the low cells and just check with a cell meter they also have a fairly inexpensive 30 amp BMS. At battery hookup.
 
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