# 100/50 MPPT showing higher voltage than panels are rated **URL:** \ **Category:** DIY\ **Tags:** mppt, mppt\_controllers, beginner\ **Created:** [8 April 2026 22:45 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230 "2026-04-08T22:45:00Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [8 April 2026 22:45 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/1 "2026-04-08T22:45:00Z")
I have a Victron 100/50 MPPT controller and I am a bit confused about the voltage I am seeing when the batteries are fully charged. I have two identical panels hooked in series and the panel specs I was given was the following Rated Maximum Power (Pmax): 275 W Open Circuit Voltage (Voc): 24.88 V Maximum Power Voltage (Vmp): 21.24 V Short Circuit Current (Isc): 13.58 A Maximum Power Current (Imp): 12.94 A Module Efficiency: 20.4% What confuses me is why I see the SmartSolar MPPT in the Victron UI showing voltages of 80-90V, how is this possible? Have I done something wrong? Thanks for any help you can give me ---
**Author:** ![TherealKT](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/therealkt/32/43291_2.png) [@TherealKT](https://community.victronenergy.com/u/TherealKT)\ **Post date:** [8 April 2026 23:38 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/2 "2026-04-08T23:38:12Z")
Not sure why you would see that high of voltage. It should be around 42 V on the solar side. I am sure others will chime in. You ought to post your settings and a screen shot of the UI. ---
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [9 April 2026 00:06 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/3 "2026-04-09T00:06:58Z")
Thanks for the response. I’ve attached images of the victron UI and settings. ![Screenshot_20260408-170242](https://europe1.discourse-cdn.com/victron/original/3X/b/6/b6863407bff11d1f23857e5a749c0442dcdb8ec7.png) ![Screenshot_20260408-170317](https://europe1.discourse-cdn.com/victron/original/3X/6/f/6fdb4244aa53ccaa009629266157dbf4778ec85a.png) ---
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [9 April 2026 00:26 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/4 "2026-04-09T00:26:36Z")
I will also add, that when the battery is not full, the voltage seems to drop and the current increases ---
**Author:** ![TherealKT](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/therealkt/32/43291_2.png) [@TherealKT](https://community.victronenergy.com/u/TherealKT)\ **Post date:** [9 April 2026 00:45 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/5 "2026-04-09T00:45:03Z")
You are sure your panels Vmp is 24.88? Either way they are working and within the boundaries of the controller. It will handle up to 100V. > [@TerryR](#): > > the voltage seems to drop and the current increases In bulk stage the battery side voltage should climb and current stay relatively constant until you reach absorption. The screenshot you posted looks like its working correctly. From that point the voltage should climb to 14.2 then go to absorption. ---
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [9 April 2026 01:08 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/6 "2026-04-09T01:08:37Z")
Attached is an image from the sticker on the back of one of the panels. I tested them individually in the late afternoon sun and both measure over 40V output. ![Screenshot_20260408-180437](https://europe1.discourse-cdn.com/victron/original/3X/4/f/4f7e7d16583b61d75fe7eef0ad6c9adc5399cec0.jpeg) ---
**Author:** ![Radunre](https://avatars.discourse-cdn.com/v4/letter/r/cdc98d/32.png) [@Radunre](https://community.victronenergy.com/u/Radunre)\ **Post date:** [9 April 2026 05:06 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/7 "2026-04-09T05:06:34Z")
Clearly a label error. Found datasheet that shows different numbers, much closer to your measurements. It is a good practice to also check Victron MPPT calculator, with panel code. ![Screenshot 2026-04-09 080810](https://europe1.discourse-cdn.com/victron/original/3X/a/e/ae3c67273e995f1896a6d52d44512e1b23bf3e62.png) ![Screenshot 2026-04-09 080443](https://europe1.discourse-cdn.com/victron/original/3X/c/5/c5e3c123e2cc7b18d4ac9c4c8b57492569820277.png) ---
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [9 April 2026 06:41 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/8 "2026-04-09T06:41:49Z")
Great sleuthing @Radunre That is crazy that the factory sticker is completely incorrect. I haven’t been able to find the data sheet on the perlight website, but I did see a few solar businesses selling the same model with specs in-line with the Victron MPPT calculator. Thanks again ---
**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:** [9 April 2026 09:00 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/9 "2026-04-09T09:00:33Z")
Lucky beans. Its alway best to check with a meter on an installation. More than bargained for can work adversely as well. ---
**Author:** ![TherealKT](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/therealkt/32/43291_2.png) [@TherealKT](https://community.victronenergy.com/u/TherealKT)\ **Post date:** [9 April 2026 17:56 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/10 "2026-04-09T17:56:08Z")
Wow. Good to have a solid answer. Its fortunate you had a sufficiently sized charge controller. Otherwise the high voltage may have ruined it. ---
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [9 April 2026 18:40 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/11 "2026-04-09T18:40:11Z")
I am considering changing from series to parallel for this setup so both amps and volts are well under the MPPT max input values. I previously had some renogy 3-1 connectors for this but there were some connectivity issues. To make things more solid my thought was to bring all 4 lines into the van and connect to positive and negative bus bars and then to the MPPT. I also have inline 15A fuses to add to each positive line at the busbar. Does this sound like a good idea? Or would I be better off mounting fuse holders on a DIN rail? In the future I may add one, possibly two more panels but never more than 4 total. I understand with any more panels I will probably need either a second controller or a larger spec’d controller as series will put me over the max volts and parallel would put me over max watts ---
**Author:** ![TherealKT](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/therealkt/32/43291_2.png) [@TherealKT](https://community.victronenergy.com/u/TherealKT)\ **Post date:** [9 April 2026 23:56 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/12 "2026-04-09T23:56:52Z")
I am a fan of simple. I would leave it as it is. If you want to add panels in the future you can just add another controller. On another note you should have circuit protection on the PV side. Anything over 40 V is considered dangerous. There are high voltage circuit breakers that would work for this. ---
**Author:** ![Steven1945](https://avatars.discourse-cdn.com/v4/letter/s/dec6dc/32.png) [@Steven1945](https://community.victronenergy.com/u/Steven1945)\ **Post date:** [12 April 2026 00:12 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/13 "2026-04-12T00:12:49Z")
The output shown on the charge controller is what I would expect to see on a 275 watt panels in normal daylight. I say the label has the wrong numbers for voltage and current rating ---
**Author:** ![TherealKT](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/therealkt/32/43291_2.png) [@TherealKT](https://community.victronenergy.com/u/TherealKT)\ **Post date:** [12 April 2026 01:49 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/14 "2026-04-12T01:49:39Z")
I guess I am missing something. Your screenshot shows 81V which is well within the specs of a 100/50 controller even if temperatures are low and the voltage climbs. @Radunre posted the Victron MPPT calculator for your panels showing the 100/30 being sufficient. ---
**Author:** ![ira251166](https://avatars.discourse-cdn.com/v4/letter/i/4bbf92/32.png) [@ira251166](https://community.victronenergy.com/u/ira251166)\ **Post date:** [12 April 2026 07:02 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/15 "2026-04-12T07:02:06Z")
Have you measured the voltage with a good quality voltmeter? It might make more sense if you confirm this first. ---
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [14 April 2026 19:06 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/16 "2026-04-14T19:06:55Z")
There is no “issue” per se, aside from the numbers being output by the panels not matching what is being advertised on the panels. I was unsure if I was doing something wrong. Now that I know the panels are mislabelled, I know that I am better off changing to parallel so I can plan for a third panel in the future if/when needed. With this setup being on a van, I have to be pretty careful with my planning for the future so I don’t have to rip everything apart to re-organize, drill holes, etc. ---
**Author:** ![TerryR](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TerryR](https://community.victronenergy.com/u/TerryR)\ **Post date:** [16 April 2026 01:02 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/17 "2026-04-16T01:02:33Z")
Also, here is another reason that it is an issue (I forgot about this from when I had them in series late last summer as a test) ![Screenshot from 2026-04-15 18-01-28](https://europe1.discourse-cdn.com/victron/original/3X/d/e/deccc24f7b7dad638f5afd148a350bd5c725959c.png) ---
**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:** [16 April 2026 04:36 UTC](https://community.victronenergy.com/t/100-50-mppt-showing-higher-voltage-than-panels-are-rated/56230/18 "2026-04-16T04:36:13Z")
In cold conditions panels can have a much higher VOC. > **[Err 33 - PV over-voltage - MPPT Solar Charger Error Codes \[Victron Energy\]](https://www.victronenergy.com/live/mppt-error-codes#err_33_-_pv_over-voltage)** > > Solar Chargers indicate an error with their LEDs. See the Toolkit App for the LED codes. ![Screenshot2026-04-16-06-37-30-422com.duckduckgo.mobile.android-edit](https://europe1.discourse-cdn.com/victron/original/3X/a/f/af51c754c120f0361dc4cb5e07db54e2de200cdb.jpeg) According to the calculator is hovering at 98V at -10° and this is assuming that the ~3% variance they can have doesn’t swing to more than bargained for.