It worked for a couple of hours. I had turned off the breaker on the battery to check something then turned it back it on. When I did it went up in smoke. It was at 53.8v. The inverter breaker was off and not short. Later on everything else worked fine, but the shunt was burnt out and wouldn’t turn …

It seems that the power source IC of the shunt (step down converter) is burnt. It happens. You were not at fault.

Most likely a series was made with wrong parts, you should receive an improved version (warranty) Several 300a shunts have gone up in smoke in recent weeks..

Just bought one of those 300A shunts, but I didn’t power it up yet… Do you know the range (serial numbers) of the defective one? Or a reference somewhere? Thanks in advance!

Indeed, it seems that it’s not an isolated incident… Same issue here, where @guystewart asked for serial number of the affected units. [image] SmartShunt burned Q&A and troubleshooting Hello, My smartshunt burned out when I tried to start it up (marked in red…

Hi @nolensb , As mentioned please get in touch with your dealer for an RMA warranty replacement. I am still collecting all the reports I can to help R&D investigate what is causing this issue. If you could please post the serial number id appreciate it.

It made me curious and, before powering it up, I wanted to know which IC is there and if indeed will handle up to 55V, in my case. It seems that it’s an LM5163, which, according with its datasheet, it supports up to 100V. So I may be safe to power it up… :slight_smile: Please @nolensb , can you c…

Couldn’t find the message about the burned shunts maybe on a Dutch ess forum ( Teaker.net ) @nolensb don’t open the shunt, you will lose warranty if you do so!

[image] Frisianstar: @nolensb don’t open the shunt, you will lose warranty if you do so! Too late for that… From where did you think he’s got that first picture on the first post? :zany_face: Come on… Loose warranty for taking a peek inside a failed product?..

If you say „breaker“ I assume you had a breaker on the positiv. In a DC environment you never want to cut positiv side first as this will produce a big power spike and can/will fry your stuff. This is something any car technician knows but is not really common knowledge otherwise. If you google fo…

[image] Alex Pescaru: Loose warranty for taking a peek inside a failed product?.. Problem is some people damage things when opening. So viewing it from the other side its a chicken-egg story. Which came first? A good rules of thimb is - If it is under warranty try the claim first, if denied …

Smart shunt 300amp up in smoke

DIY

alexpescaru (Alex Pescaru) 14 February 2026 19:54 19

I would (for my 48V system) put a low esr 47uF/63V electrolytic capacitor between Vbatt+ and Battery minus.

SmartShunt 500A odd accessory

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Smart shunt 300amp up in smoke

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