# MPPT 250/85 not working

**URL:** <https://community.victronenergy.com/t/mppt-250-85-not-working/54125>\
**Category:** DIY\
**Tags:** mppt\_controllers, diy\
**Created:** [28 February 2026 12:52 UTC](https://community.victronenergy.com/t/mppt-250-85-not-working/54125 "2026-02-28T12:52:52Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![odddsocks](https://avatars.discourse-cdn.com/v4/letter/o/8797f3/32.png) [@odddsocks](https://community.victronenergy.com/u/odddsocks)\
**Post date:** [28 February 2026 12:52 UTC](https://community.victronenergy.com/t/mppt-250-85-not-working/54125/1 "2026-02-28T12:52:52Z")

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2x MPPT 250/85 faulted.

New Li battery over charge by MPPT, it’s BMS disconnect 48 to protect battery. First sunny day this year.

Now both MPPT have 0,2ohm on pv input, pull 3.9A 0,7v off pv array, but MPPT unit remains off, pv array working ok 204v when open circuit.

MPPT never failed on old FLA battery, but Li BMS bit clever, would the battery disconnect damage MPPT ? Suspect these 2 MPPT monitor BMV702 still on CCGX as SOC, just kept going. The 3rd MPPT 150/60 still working.

Can MPPT be fixed?

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**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:** [28 February 2026 13:43 UTC](https://community.victronenergy.com/t/mppt-250-85-not-working/54125/2 "2026-02-28T13:43:32Z")

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A battery disconnect would not normally break an MPPT.

> **[6. Pre-RMA test form - MPPT solar charger - 6. Pre-RMA test form - MPPT solar...](https://www.victronenergy.com/media/pg/Pre-RMA_Bench_Test_Instructions/en/pre-rma-test-form---mppt-solar-charger.html#UUID-a02c41de-0c89-5d84-c701-4f28b6ae665b)**
>
> Product, system and fault information

If you have worked through the pre RMA tests still not solved the issue, then it is time to send them in to a service and repair centre.

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**Author:** ![chrigu](https://avatars.discourse-cdn.com/v4/letter/c/ba9def/32.png) [@chrigu](https://community.victronenergy.com/u/chrigu)\
**Post date:** [1 March 2026 13:56 UTC](https://community.victronenergy.com/t/mppt-250-85-not-working/54125/3 "2026-03-01T13:56:49Z")

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Sounds like the PV input spiked above 245V and the internal PV shortcircuiting relay triggered. Do you have error 38 or 39?

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<div class="post-metadata">

**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:** [1 March 2026 14:08 UTC](https://community.victronenergy.com/t/mppt-250-85-not-working/54125/4 "2026-03-01T14:08:32Z")

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Thebapp should definitely have an error message.

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<div class="post-metadata">

**Author:** ![R.L](https://avatars.discourse-cdn.com/v4/letter/r/22d042/32.png) [@R.L](https://community.victronenergy.com/u/R.L)\
**Post date:** [1 March 2026 14:16 UTC](https://community.victronenergy.com/t/mppt-250-85-not-working/54125/5 "2026-03-01T14:16:06Z")

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> [@odddsocks](#):
>
> Can MPPT be fixed?

Try to [reset the Over\_Voltage Relay](https://www.victronenergy.com/live/mppt_pv_short_relay_reset#:~:text=Disconnect%20the%20PV%20Input%20terminals,the%20reset%20menu%20is%20shown?)