After quite some time lobbying Adler Electric USA to bring their 36x22mm EF3 fuses to North America, they are now planning to stock them in their Seattle warehouse. If you’re not familiar with these fuses, then search the forum for EF3 fuses or see one discussion here: Fuses and Wattloss on T Class …

@ricardocello Pls use the Adler EF3 only for bigger batteries that have a second faster fuse build in. Branches like MPPT, RS, MP2 or Quattro do not require AiC greater than 2,000A. Consequently a faster MEGA fuse is the better choice there. My batteries have 250A MCCBs build in and an additional…

I measured the resistance for 200A EF3 samples that I have. See here: Fuses and Wattloss on T Class MEGA EF3 and DC Breakers

[image] Rick: Also, great conversation from everyone here, thanks! Ditto! I very much appreciate the conversation. It reinforces why we have technical reviews in the first place.

[image] Björn Kellermann: Branches like MPPT, RS, MP2 or Quattro do not require AiC greater than 2,000A. Consequently a faster MEGA fuse is the better choice there. Are you sure? With a short circuit somewhere in that branch, the fuse would have to break the current coming from the entire DC …

[image] Björn Kellermann: Branches like MPPT, RS, MP2 or Quattro do not require AiC greater than 2,000A. Consequently a faster MEGA fuse is the better choice there. I disagree! Like @Ektus above also mentions: The more batteries are present in the system, the higher the AIC needs to be. And …

A quick Google search I found semiconductor fuses special for ess/ bess systems. (GRL FUSES)

If there’s say 10,000A of available fault current at the battery to bus bar connection then there would still be that much at the busbars load connections?

You mean the gRL type made by Siba? Or the brand GRL from YueQuing City? All I wanted to say (and I could be more specific on that…) is that too many people ar thinking too lightly about battery protection in a LiFePo4 in their home energy storage system. And that will come to bite us who DO think …

This all depend depend on your system design and I have to apologize having answered not specific enough. I designed 4 batteries, each about 15kWh or able to deliver ~2,000A in sum 8,000A. Each battery has a 250A MCB to react fast and an Adler EF3 200A for high AIC. I haven’t checked if there is …

This is a question to everyone from somebody who doesn’t have a firm grasp of these issues. Suppose the power is coming to the busbars from the chargers rather than protected batteries? Or the chargers and panels are not capable of delivering such massive currents?

Attention distributors/dealers/installers: Adler EF3 fuses Available in the USA

Q&A and troubleshooting

BjoernK (Björn Kellermann) 26 July 2026 06:06 38

@Brucey

with this code and an USB-I2C PCB up to four Lynx Distributors can be integrated directly into Venus OS. BOM and pictures in my system thread…

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Attention distributors/dealers/installers: Adler EF3 fuses Available in the USA

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