I’ve seen a number of Victron diagrams where each battery is connected to a space on a Lynx Distributor - which means a Mega fuse is used to protect the battery cable. I’ve read that you should only use Class T or ANL fuses in for this application.
Just wondering if anyone has any input on how/why Victron supports the use of a Mega fuse when connecting batteries to a Lynx Distributor.
I can’t and won’t speak for Victron, but you should not rely on MEGA fuses for fusing batteries, especially if they are lithium batteries. Depending on the requirements of the installation, I would fuse as closely to the battery terminal as you can with a fuse that has an AIC rating required by the installation.
Victron showing MEGA fuses for batteries could be a relic of the lead-acid days. But even then, I wouldn’t use them. Victron also states that the Lynx system can handle 1000A continuous when it clearly can’t without active cooling. But that’s a different topic that has been discussed a lot on the community.
Victron does now offer a Lynx PowerIn Class T device that only holds two 225A and larger CLass T fuses. It’s not supported, but we have slightly modified the existing Lynx PowerIn to securely hold both sides of smaller Class T fuses. This requires installing an extra stainless steel bolt and a little JB Weld.
If you live in Europe, check out the EF3 fuse. It will fit the Lynx Distributor and offers a high AIC. These aren’t available in the USA (someone please correct me if I’m wrong!) however.
Hope this helps
Victron has now released the Lynx Class T Power In which is compatible with the Lynx range to address this. There however remains older literature available.
There is a thread on here where high AIC Adler EF3 fuses have successfully been fitted within a Lynx Distributor. Here is one thread, there are others, search for EF3.
Thanks - I’ll stick with class T fuses.
A few years ago (2021?) I asked a very large US-based Victron distributor about the MEGA fuse inclusion in all the Victron schematics. Their response was that they thought it was a relic of a European-centric use of that type of fuse.
I don’t mind using the MEGA fuses in my Lynx Distributor. My gripe with them is that they don’t go low enough on the amperage. I use a Class T fuse inside my DIY 48v battery box. In my opinion, a MEGA fuse has no business protecting the cable immediately downstream of a LiFePO₄ battery.
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