48v to 12v tobson 20a reducer gets too hot

del50man · 04-23-2019, 07:51 PM

I installed a reducer today and have installed many of them, but today this one got too hot to touch. No relay or switch was installed. Any reason why the relay got too hot. I had 12v on the 12v side.
I disconnected it for a bit to cool it off. When I connected the hot to the battery it sparked as it had a draw?? Nothing was connected to the 12v side though.

NoleFan4Ever · 04-23-2019, 11:10 PM

Unless something was pulling more than the 20a design or it is a faulty reducer.

As far as the spark, very normal when a reducer/converter is installed and also the draw from your controller. It is good to use a ~60w incandescent bulb between the pack Neg and cable to allow the energy to flow and then after a few seconds you can land the cable without a large spark.

Mooncarter · 04-23-2019, 11:23 PM

What Nole said is spot on.

But I have to ask. You say: "... the relay got too hot." Are you talking about a relay after the reducer, or did you mean the reducer?

del50man · 04-24-2019, 07:54 AM

Mooncarter - I meant the reducer, sorry.
Nolefan4ever - Thanks for the input. I have them sending me another reducer.

NoleFan4Ever · 04-24-2019, 12:33 PM

And reducer are getting to be so cheap these days it is hard to rule out an internal fault.

04-23-2019, 07:51 PM	#1
del50man Gone Wild Join Date: Mar 2013 Posts: 307	48v to 12v tobson 20a reducer gets too hot I installed a reducer today and have installed many of them, but today this one got too hot to touch. No relay or switch was installed. Any reason why the relay got too hot. I had 12v on the 12v side. I disconnected it for a bit to cool it off. When I connected the hot to the battery it sparked as it had a draw?? Nothing was connected to the 12v side though.
del50man Gone Wild Join Date: Mar 2013 Posts: 307

04-23-2019, 11:10 PM	#2
NoleFan4Ever MOD of all BS! Join Date: Sep 2011 Location: Florida Posts: 17,477	Re: 48v to 12v tobson 20a reducer gets too hot Unless something was pulling more than the 20a design or it is a faulty reducer. As far as the spark, very normal when a reducer/converter is installed and also the draw from your controller. It is good to use a ~60w incandescent bulb between the pack Neg and cable to allow the energy to flow and then after a few seconds you can land the cable without a large spark.

04-23-2019, 11:23 PM	#3
Mooncarter Gone Insane Join Date: Oct 2016 Location: Richmond, VA Posts: 14,215	Re: 48v to 12v tobson 20a reducer gets too hot What Nole said is spot on. But I have to ask. You say: "... the relay got too hot." Are you talking about a relay after the reducer, or did you mean the reducer?

04-24-2019, 07:54 AM	#4
del50man Gone Wild Join Date: Mar 2013 Posts: 307	Re: 48v to 12v tobson 20a reducer gets too hot Mooncarter - I meant the reducer, sorry. Nolefan4ever - Thanks for the input. I have them sending me another reducer.
del50man Gone Wild Join Date: Mar 2013 Posts: 307

04-24-2019, 12:33 PM	#5
NoleFan4Ever MOD of all BS! Join Date: Sep 2011 Location: Florida Posts: 17,477	Re: 48v to 12v tobson 20a reducer gets too hot And reducer are getting to be so cheap these days it is hard to rule out an internal fault.

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