# \#autotransformer **URL:** https://community.victronenergy.com/tag/autotransformer/222.md [Latest](https://community.victronenergy.com/latest.md) · [Categories](https://community.victronenergy.com/categories.md) · [Tags](https://community.victronenergy.com/tags.md) --- ## [120 -\> 120/240 autotransformer conflicting schematics](https://community.victronenergy.com/t/120-120-240-autotransformer-conflicting-schematics/63375)
**Author:** [@cmoulder](https://community.victronenergy.com/u/cmoulder)\ **Replies:** 2\ **Last updated:** [30 September 2026 14:30 UTC](https://community.victronenergy.com/t/120-120-240-autotransformer-conflicting-schematics/63375 "2026-09-30T14:30:51Z")
Does anyone understand the conflicting schematics for the autotransformer when trying to go from 120V to 120/240? The manual (page 5 https://www.victronenergy.com/upload/documents/Manual-Autotransformer-32A-and-100A-EN-… --- ## [Autotransformer terminal question](https://community.victronenergy.com/t/autotransformer-terminal-question/62992)
**Author:** [@JWH](https://community.victronenergy.com/u/JWH)\ **Replies:** 1\ **Last updated:** [19 September 2026 02:57 UTC](https://community.victronenergy.com/t/autotransformer-terminal-question/62992 "2026-09-19T02:57:26Z")
I just purchased the new version (ITR000100102) of the 100amp autotransformer. Are the terminals rated for aluminum wire? Or should I use a few multi taps to connect short copper jumpers? --- ## [Wiring the 32A Autotransformer](https://community.victronenergy.com/t/wiring-the-32a-autotransformer/61360)
**Author:** [@Markout](https://community.victronenergy.com/u/Markout)\ **Replies:** 1\ **Last updated:** [8 August 2026 06:33 UTC](https://community.victronenergy.com/t/wiring-the-32a-autotransformer/61360 "2026-08-08T06:33:37Z")
Back again - We have been carrying an 32A Autotransformer for fitting in Canada to allow us to handle North American shore power. Our Canadian electrician has not seen one before and the diagrams in the manual do not sho… --- ## [Fitting the Victron Autotransformer and ancillary items required for US shore power](https://community.victronenergy.com/t/fitting-the-victron-autotransformer-and-ancillary-items-required-for-us-shore-power/59425)
**Author:** [@Markout](https://community.victronenergy.com/u/Markout)\ **Replies:** 3\ **Last updated:** [6 August 2026 17:49 UTC](https://community.victronenergy.com/t/fitting-the-victron-autotransformer-and-ancillary-items-required-for-us-shore-power/59425 "2026-08-06T17:49:54Z")
We are carrying a Victron Autotransformer for fitting to help us take on board US shore power - we are a sailing yacht transiting from Europe to Canada and USA via Iceland and Greenland. Does anyone have experience of fi… --- ## [Do 2 Quattro inverters in split-phase configuration do load balancing?](https://community.victronenergy.com/t/do-2-quattro-inverters-in-split-phase-configuration-do-load-balancing/60876)
**Author:** [@ChrisATX](https://community.victronenergy.com/u/ChrisATX)\ **Replies:** 3\ **Last updated:** [26 July 2026 14:37 UTC](https://community.victronenergy.com/t/do-2-quattro-inverters-in-split-phase-configuration-do-load-balancing/60876 "2026-07-26T14:37:05Z")
Two 120/240V inputs, one from the generator and one from shore power, both going to 2 Quattro inverters in split-phase configuration. Is it true that this will result in load balancing, or would an autotransformer be nee… --- ## [Off Grid 3 phase with transformer good practice?](https://community.victronenergy.com/t/off-grid-3-phase-with-transformer-good-practice/60383)
**Author:** [@Glitschy](https://community.victronenergy.com/u/Glitschy)\ **Replies:** 10\ **Last updated:** [16 July 2026 09:25 UTC](https://community.victronenergy.com/t/off-grid-3-phase-with-transformer-good-practice/60383 "2026-07-16T09:25:44Z")
Hello to everybody. Asking for opinion. System before, off grid single multi 48V 5000 with single ac coupling lithium batteries and 3 phase generator and between generator and AC in multi, there is a transformer 400V in … --- ## [Using 50amp isolation transformer with 30amp shore power](https://community.victronenergy.com/t/using-50amp-isolation-transformer-with-30amp-shore-power/60194)
**Author:** [@Neall](https://community.victronenergy.com/u/Neall)\ **Replies:** 1\ **Last updated:** [8 July 2026 22:11 UTC](https://community.victronenergy.com/t/using-50amp-isolation-transformer-with-30amp-shore-power/60194 "2026-07-08T22:11:12Z")
I have a vessel with an existing 50amp isolation transformer, single coil input and center tapped two phase output. 50 amp shore cable, two phase. I’d like a way to use 30amp single phase shore power. I’m thinking of a… --- ## [MP-II 48/8000/110-100 With AT-100 For Split-Phase Output - Excessive Neutral Current](https://community.victronenergy.com/t/mp-ii-48-8000-110-100-with-at-100-for-split-phase-output-excessive-neutral-current/58905)
**Author:** [@B-ManTN](https://community.victronenergy.com/u/B-ManTN)\ **Replies:** 2\ **Last updated:** [6 June 2026 17:08 UTC](https://community.victronenergy.com/t/mp-ii-48-8000-110-100-with-at-100-for-split-phase-output-excessive-neutral-current/58905 "2026-06-06T17:08:07Z")
I am in the USA. I configured the MP-II for 240VAC, 60 HZ. It is connected to a Victron AT-100 autotransformer. The Critical Loads sub-panel does not have the neutral bonded to the ground. The Main Service Panel does hav… --- ## [2 Multiplus units in split phase with auto transformer pass-through and charging not working](https://community.victronenergy.com/t/2-multiplus-units-in-split-phase-with-auto-transformer-pass-through-and-charging-not-working/57696)
**Author:** [@chriscatt](https://community.victronenergy.com/u/chriscatt)\ **Replies:** 6\ **Last updated:** [28 May 2026 06:04 UTC](https://community.victronenergy.com/t/2-multiplus-units-in-split-phase-with-auto-transformer-pass-through-and-charging-not-working/57696 "2026-05-28T06:04:30Z")
My set up is on a boat with lithium batteries. 12 volts DC, 120v AC. All the equipment is new, I am in the installation process. I have 2 Multiplus ii 3000 units programmed split phase (180). I have 240v for the compr… --- ## [I want to buy a generator for my Multiplus II](https://community.victronenergy.com/t/i-want-to-buy-a-generator-for-my-multiplus-ii/57994)
**Author:** [@psper](https://community.victronenergy.com/u/psper)\ **Replies:** 1\ **Last updated:** [16 May 2026 10:43 UTC](https://community.victronenergy.com/t/i-want-to-buy-a-generator-for-my-multiplus-ii/57994 "2026-05-16T10:43:01Z")
Hi, I want to buy a generator for my Multiplus II. What generator specifications should I consider? Which models You recomend? Thanks in advance, --- ## [How to get warranty support when dealer closes business? (Continuous Resources LLC)](https://community.victronenergy.com/t/how-to-get-warranty-support-when-dealer-closes-business-continuous-resources-llc/56509)
**Author:** [@kcookusa](https://community.victronenergy.com/u/kcookusa)\ **Replies:** 12\ **Last updated:** [14 April 2026 20:29 UTC](https://community.victronenergy.com/t/how-to-get-warranty-support-when-dealer-closes-business-continuous-resources-llc/56509 "2026-04-14T20:29:26Z")
I had a Victron system installed in my RV by Continuous Resources in November of 2021. I’ve had the MPPT and Auto Transformer both fail. I replaced the MPPT already before realizing it was still under warranty. I’ve b… --- ## [Using a Victron Energy Orion 24/12 70amp DC-DC converter](https://community.victronenergy.com/t/using-a-victron-energy-orion-24-12-70amp-dc-dc-converter/56374)
**Author:** [@draz1959](https://community.victronenergy.com/u/draz1959)\ **Replies:** 0\ **Last updated:** [11 April 2026 18:04 UTC](https://community.victronenergy.com/t/using-a-victron-energy-orion-24-12-70amp-dc-dc-converter/56374 "2026-04-11T18:04:00Z")
I like your expert opinion on the use of your Orion 24/12 70amp DC-DC converter and your 24-12 50amp DC-DC converter. I am running a Minn-Kota 80# thrust 24v trolling motor, that is NOT brushless, off a 100ah 24v lithiu… --- ## [Alta tensión](https://community.victronenergy.com/t/alta-tension/56030)
**Author:** [@JorgeJB78](https://community.victronenergy.com/u/JorgeJB78)\ **Replies:** 6\ **Last updated:** [10 April 2026 04:33 UTC](https://community.victronenergy.com/t/alta-tension/56030 "2026-04-10T04:33:38Z")
Buenas, no dejo de tener problemas con la tensión de las baterias. Las descargue enteras y las volví a cargar al 100%. Al conectarlas el MPPT me sigue dando el mismo error y no me deja recargarlas con las placas. He com… --- ## [How can I transform the FLOATING output of a 220V GENERATOR to a PHASE-NEUTRAL output](https://community.victronenergy.com/t/how-can-i-transform-the-floating-output-of-a-220v-generator-to-a-phase-neutral-output/55985)
**Author:** [@ERU](https://community.victronenergy.com/u/ERU)\ **Replies:** 4\ **Last updated:** [4 April 2026 08:09 UTC](https://community.victronenergy.com/t/how-can-i-transform-the-floating-output-of-a-220v-generator-to-a-phase-neutral-output/55985 "2026-04-04T08:09:20Z")
Hi, How can I connect a 220V GENERATOR with a FLOATING output (L1 with L2 = 220V) to obtain a PHASE-NEUTRAL output before entering the VE\_TRANSFER? Can I use VE\_TRANSFER K2 CONTACTOR as a trigger that signals “GENERATO… --- ## [Autotransformer in RV Split-Phase (120/208 or 120/240) — What am I missing?](https://community.victronenergy.com/t/autotransformer-in-rv-split-phase-120-208-or-120-240-what-am-i-missing/55883)
**Author:** [@NoColorsAdded](https://community.victronenergy.com/u/NoColorsAdded)\ **Replies:** 11\ **Last updated:** [2 April 2026 15:26 UTC](https://community.victronenergy.com/t/autotransformer-in-rv-split-phase-120-208-or-120-240-what-am-i-missing/55883 "2026-04-02T15:26:18Z")
I’m trying to better understand how people are successfully using autotransformers in RV/mobile applications, specifically when dealing with both 120/240 split-phase and 120/208 wye shore power. In a typical RV setup, w… --- ## [Meine beiden Solarregler zeigen "Float" an, obwohl nur 160 Ah von 200 Ah geladen sind](https://community.victronenergy.com/t/meine-beiden-solarregler-zeigen-float-an-obwohl-nur-160-ah-von-200-ah-geladen-sind/55044)
**Author:** [@Falter-Vanlife](https://community.victronenergy.com/u/Falter-Vanlife)\ **Replies:** 10\ **Last updated:** [18 March 2026 12:45 UTC](https://community.victronenergy.com/t/meine-beiden-solarregler-zeigen-float-an-obwohl-nur-160-ah-von-200-ah-geladen-sind/55044 "2026-03-18T12:45:36Z")
Hallo, ich bin neu hier und habe ein Problem: Ich habe zwei Solarregler - MPPT 100/20 und MPPT 100/30, weil ich zwei verschiedene Panelen auf dem Dach habe. Mein Akkustand ist 160 Ah von 200 Ah, trotzdem stehen beide Reg… --- ## [Autotransformer running from ecoflow is growling badly](https://community.victronenergy.com/t/autotransformer-running-from-ecoflow-is-growling-badly/55019)
**Author:** [@multiplyme](https://community.victronenergy.com/u/multiplyme)\ **Replies:** 3\ **Last updated:** [17 March 2026 10:16 UTC](https://community.victronenergy.com/t/autotransformer-running-from-ecoflow-is-growling-badly/55019 "2026-03-17T10:16:24Z")
Hi everyone, I’m trying to run an autotransformer from the 120v of an Ecoflow Delta 3 Max but whichever wiring I choose it is growling badly. I read the sine wave from the Ecoflow might not be good enough to run throug… --- ## [100a Autotransformer for a Onan 8k QD](https://community.victronenergy.com/t/100a-autotransformer-for-a-onan-8k-qd/54267)
**Author:** [@NotAnElectrician](https://community.victronenergy.com/u/NotAnElectrician)\ **Replies:** 2\ **Last updated:** [3 March 2026 01:27 UTC](https://community.victronenergy.com/t/100a-autotransformer-for-a-onan-8k-qd/54267 "2026-03-03T01:27:52Z")
I am in need of the proper method of connection for a Onan 8k QD generator into a Victron 100a Autotransformer. It will then go through a Auto Transfer Switch that my 50a shore power also goes through, and then on to a B… --- ## [How to wire AC input for 2 Multiplus II 12/3000/120 units configured in split phase](https://community.victronenergy.com/t/how-to-wire-ac-input-for-2-multiplus-ii-12-3000-120-units-configured-in-split-phase/53903)
**Author:** [@chriscatt](https://community.victronenergy.com/u/chriscatt)\ **Replies:** 0\ **Last updated:** [25 February 2026 15:58 UTC](https://community.victronenergy.com/t/how-to-wire-ac-input-for-2-multiplus-ii-12-3000-120-units-configured-in-split-phase/53903 "2026-02-25T15:58:34Z")
Shore power is 120v/30A. I have a 30a circuit breaker for the H/N. Planning to to use a junction box after the circuit breaker with 10ga wires to each unit AC input. Is this the correct way to do the AC input for both… --- ## [Help with wiring 2 Multi plus 12/3000/120 units with auto transformer split phase](https://community.victronenergy.com/t/help-with-wiring-2-multi-plus-12-3000-120-units-with-auto-transformer-split-phase/52886)
**Author:** [@chriscatt](https://community.victronenergy.com/u/chriscatt)\ **Replies:** 8\ **Last updated:** [25 February 2026 00:55 UTC](https://community.victronenergy.com/t/help-with-wiring-2-multi-plus-12-3000-120-units-with-auto-transformer-split-phase/52886 "2026-02-25T00:55:35Z")
I purchased 2 Multiplus ii 12/3000/120 units and a 100amp auto transformer. My incoming current is 120v 30 or 50 amp. I want to wire this to send 120v circuit to my electrical panel and a 240v circuit to another locat… --- ## [Overlander setup - 110v charging USA/Central America etc](https://community.victronenergy.com/t/overlander-setup-110v-charging-usa-central-america-etc/53722)
**Author:** [@tarquinpack](https://community.victronenergy.com/u/tarquinpack)\ **Replies:** 5\ **Last updated:** [24 February 2026 21:52 UTC](https://community.victronenergy.com/t/overlander-setup-110v-charging-usa-central-america-etc/53722 "2026-02-24T21:52:38Z")
Hi All I am shipping my overlander from Europe to America. We have 1400w of solar on the roof, and a reasonable battery bank, DC t DC charges etc, but sadly still need to plug into power occasionally. The batteries are… --- ## [Temperature light but fan not running](https://community.victronenergy.com/t/temperature-light-but-fan-not-running/32753)
**Author:** [@daabel](https://community.victronenergy.com/u/daabel)\ **Replies:** 3\ **Last updated:** [23 February 2026 00:29 UTC](https://community.victronenergy.com/t/temperature-light-but-fan-not-running/32753 "2026-02-23T00:29:43Z")
I have a 100A unit using it to step down from 240 to 120VAC. The temperature light is on but the fan is not running. It is warm to the touch. Why is the fan not running? --- ## [Autotransformer efficiency](https://community.victronenergy.com/t/autotransformer-efficiency/53168)
**Author:** [@laurencesaul](https://community.victronenergy.com/u/laurencesaul)\ **Replies:** 1\ **Last updated:** [11 February 2026 09:37 UTC](https://community.victronenergy.com/t/autotransformer-efficiency/53168 "2026-02-11T09:37:03Z")
Which is more efficient when converting voltage using autotransformer 120v single phase 60hz (north america) to 230v single phase hz (asian) or 230v single phase (euro/asian) to 120v single phase (north america) Usin… --- ## [Transformateur d’isolement et Multiplus 2](https://community.victronenergy.com/t/transformateur-d-isolement-et-multiplus-2/52378)
**Author:** [@PPN](https://community.victronenergy.com/u/PPN)\ **Replies:** 0\ **Last updated:** [27 January 2026 12:55 UTC](https://community.victronenergy.com/t/transformateur-d-isolement-et-multiplus-2/52378 "2026-01-27T12:55:38Z")
Bonjour à tous, j’ai un transformateur d’isolement victron 7000w et je viens de poser un onduleur multiplus 2 qui fait aussi transformateur d’isolement de 3000w. Est-ce que je peux laisser les 2 ou dois-je débrancher le … --- ## [Autotransformer Two Way?](https://community.victronenergy.com/t/autotransformer-two-way/51556)
**Author:** [@mxtreme311](https://community.victronenergy.com/u/mxtreme311)\ **Replies:** 1\ **Last updated:** [13 January 2026 04:35 UTC](https://community.victronenergy.com/t/autotransformer-two-way/51556 "2026-01-13T04:35:52Z")
I am planning to setup a Victron system in a shop that is back hauled to my residence (240 connection), this shop will have it’s own batteries and solar, but I only need one 120v Multiplus. I know I can I use an Autotran… --- ## [Dual Autotransformers for 2x stacked MultiPlus-II 120V](https://community.victronenergy.com/t/dual-autotransformers-for-2x-stacked-multiplus-ii-120v/51345)
**Author:** [@spentrepid](https://community.victronenergy.com/u/spentrepid)\ **Replies:** 1\ **Last updated:** [10 January 2026 18:52 UTC](https://community.victronenergy.com/t/dual-autotransformers-for-2x-stacked-multiplus-ii-120v/51345 "2026-01-10T18:52:50Z")
Hello, I’m wondering if it’s possible to feed L1 and L2 from shore/gen to 2x MultiPlus-II 120V (paralleled neutrals+grounds) and each of their outputs runs through separate autotransformers to increase continuous load ba… --- ## [Autotransformer - can it load balance split-phase and accept in-phase inputs as well?](https://community.victronenergy.com/t/autotransformer-can-it-load-balance-split-phase-and-accept-in-phase-inputs-as-well/50186)
**Author:** [@ChrisATX](https://community.victronenergy.com/u/ChrisATX)\ **Replies:** 7\ **Last updated:** [15 December 2025 18:44 UTC](https://community.victronenergy.com/t/autotransformer-can-it-load-balance-split-phase-and-accept-in-phase-inputs-as-well/50186 "2025-12-15T18:44:36Z")
In the USA a typical large RV needs a 50A 120/240 split-phase connection, and the autotransformer can be used to load balance. Very cool. But what happens if that same RV encounters a 30A single-phase pedestal and has t… --- ## [Alternatives to autotransformers](https://community.victronenergy.com/t/alternatives-to-autotransformers/50214)
**Author:** [@ne0031](https://community.victronenergy.com/u/ne0031)\ **Replies:** 0\ **Last updated:** [14 December 2025 19:46 UTC](https://community.victronenergy.com/t/alternatives-to-autotransformers/50214 "2025-12-14T19:46:52Z")
I have a use case where the desire is to use a Quattro 230v and also support ancillary 120v loads. The 28A rating of the Victron autotransformer would be exceeded on a regular basis, and personally, I’d rather just use a… --- ## [Auto isolation transformer boosting an already high voltage](https://community.victronenergy.com/t/auto-isolation-transformer-boosting-an-already-high-voltage/7763)
**Author:** [@MikePail](https://community.victronenergy.com/u/MikePail)\ **Replies:** 20\ **Last updated:** [3 December 2025 18:21 UTC](https://community.victronenergy.com/t/auto-isolation-transformer-boosting-an-already-high-voltage/7763 "2025-12-03T18:21:12Z")
I have a Victron system on my sailboat that includes an auto switching isolation transformer. The boat is a 230V/50Hz boat. Power is coming into the shore power connecter at 127V, being doubled, plus the extra 5% provi… --- ## [Newbie-Problem - Aktivieren von AC-out-2](https://community.victronenergy.com/t/newbie-problem-aktivieren-von-ac-out-2/41087)
**Author:** [@geophys](https://community.victronenergy.com/u/geophys)\ **Replies:** 33\ **Last updated:** [10 November 2025 15:02 UTC](https://community.victronenergy.com/t/newbie-problem-aktivieren-von-ac-out-2/41087 "2025-11-10T15:02:36Z")
Hallo in Runde, ich betreibe seit 3 Monaten einen Multiplus II 48/5000/70 als Inselanlage mit ACin und einem LiFePO4 - Satz (100 Ah). Nun möchte ich an AC-out-2 aktivieren und drehe mich im Kreise. Über die bereits über… [Next page](https://community.victronenergy.com/tag/autotransformer/222.md?match_all_tags=true&page=1&tags%5B%5D=autotransformer)