# Multiplus II + Fogstar Battery - does it need external fuse, DC isolator etc? **URL:** \ **Category:** DIY\ **Tags:** fogstar, domestic, beginner, cerbo\_gx, multiplus-ii, ess\ **Created:** [19 April 2026 22:49 UTC](https://community.victronenergy.com/t/multiplus-ii-fogstar-battery-does-it-need-external-fuse-dc-isolator-etc/56765 "2026-04-19T22:49:05Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![lxonline](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/lxonline/32/25567_2.png) [@lxonline](https://community.victronenergy.com/u/lxonline)\ **Post date:** [20 April 2026 18:54 UTC](https://community.victronenergy.com/t/multiplus-ii-fogstar-battery-does-it-need-external-fuse-dc-isolator-etc/56765/7 "2026-04-20T18:54:14Z")
> [@ichilton](#): > > Multiplus II inverter Size will be inverter size dependent. But we use mersen NH fuses normally for the battery side. There are quite a few options and plenty of suggestions on the forum. Sometimes what can be used it restricted by regulations. > [@1234enough](#): > > Personally if class T fuse isnt in battery i’d add suitable rated one. This is a good suggestion. We don’t get them here unless i special order. > **[Lynx Class-T Power In | Victron Energy](https://www.victronenergy.com/dc-distribution-systems/lynx-class-t-power-in)** > > The Lynx Class-T Power In connects and fuses up to two strings of Lithium batteries. It features a positive and negative busbar, and connections for two Class-T fuses as well as a connection to ground the DC system. The Class T-fuses, available in... > [@Fuses and Wattloss on T Class MEGA EF3 and DC Breakers](https://community.victronenergy.com/t/fuses-and-wattloss-on-t-class-mega-ef3-and-dc-breakers/43919): > > This post is about starting a discussion on what you are using for fuses or DC breakers and what your thoughts are on watt loss. Victron recommends the Lynx Distributor for inverters using Mega fuses. Victron also recommends the Lynx Class-T Power In for connecting Lithium batterys. (because a higher interrupting capacity is required for lithium batteries) Other people are using EF3 fuses from Adler. These fuses are compatible with Mega fuses if used with the Victron Distributor. They offer a… --- _[View the full topic](https://community.victronenergy.com/t/multiplus-ii-fogstar-battery-does-it-need-external-fuse-dc-isolator-etc/56765)._