# Newly installed Multiplus ii Output 1 low voltage **URL:** \ **Category:** DIY\ **Tags:** parallel, expert, multiplus\ **Created:** [20 April 2026 21:51 UTC](https://community.victronenergy.com/t/newly-installed-multiplus-ii-output-1-low-voltage/56819 "2026-04-20T21:51:25Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![sifab](https://avatars.discourse-cdn.com/v4/letter/s/ba9def/32.png) [@sifab](https://community.victronenergy.com/u/sifab)\ **Post date:** [20 April 2026 21:51 UTC](https://community.victronenergy.com/t/newly-installed-multiplus-ii-output-1-low-voltage/56819/1 "2026-04-20T21:51:25Z")
Issue: Turning on Multiplus ii, Inverter on, voltage only 270 mV measured at AC out 1 terminals. Battery voltage at 13.8 V and measuring fine at inverter connections. Please help! There are such limited resources online about this. I am testing a newly installed Multiplus ii - I have two SOK 315 A batteries in parallel that have been working fine with the DC system. I turn the inverter on in Inverter mode, no blown fuses, 13.8 V at inverter connections from batteries, ground is connected, and AC OUT 1 is measuring only 270 mV directly pushing the multimeter into the connector hot and neutral. I see this same voltage at distribution panel and outlets. I followed battery manual and instructions for configuring the inverter correctly, so I don’t think there is a problem there. Any ideas? ---
**Author:** ![MikeD](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/miked/32/1522_2.png) [@MikeD](https://community.victronenergy.com/u/MikeD)\ **Post date:** [21 April 2026 02:39 UTC](https://community.victronenergy.com/t/newly-installed-multiplus-ii-output-1-low-voltage/56819/2 "2026-04-21T02:39:19Z")
Which model multiplus? If it has an internal fuse, then check that. Try with no wiring connected to any AC port. If you configured the unit you have a Mk3 adapter, so try resetting to factory defaults, just in case you have something strange in your config.