We have 3 different sites that are using 3 x solis (EH1P5K) and 3 BSL powerline-5(configured as a 3 phase system). We have had issues with these sites from the start. There was communication issues between inverters and batteries. related to firmware on both inverters and batteries. this has now been resolved.

The major issue that is not solved yet is the backup voltage on one phase just turns off. We have noticed its typically the L2 phase(in our 3 phase system).

This seems to be triggered by a grid supply issue of either over voltage or under voltage(when only on one inverter). The strange thing is that if the grid turns off completely the unit operates as it should.

This is a big issue and should the client have 3 phase loads, damage is very lightly without the correct protection.

We have moved away from Solis because of these issues.

9 hours ago, Ecos said:

We have 3 different sites that are using 3 x solis (EH1P5K) and 3 BSL powerline-5(configured as a 3 phase system). We have had issues with these sites from the start. There was communication issues between inverters and batteries. related to firmware on both inverters and batteries. this has now been resolved.

The major issue that is not solved yet is the backup voltage on one phase just turns off. We have noticed its typically the L2 phase(in our 3 phase system).

This seems to be triggered by a grid supply issue of either over voltage or under voltage(when only on one inverter). The strange thing is that if the grid turns off completely the unit operates as it should.

This is a big issue and should the client have 3 phase loads, damage is very lightly without the correct protection.

We have moved away from Solis because of these issues.

I might be missing something vital, since I am not too familiar with 3P. But what would a different brand accomplish, if it's related to the grid? From my understanding, it does what it needs to do?

@Pho3niX90 a different brand may have a firmware solution to mitigate this grid issue.

@AlexTZA on the whole, the inverter has worked well for me, however, my issue with Solis is with the BMS not having been set properly with Freedom Won eTower batteries. Specifically:

1. The number of batteries is not shown on the App or Webportal

2. The batteries Cycle count for each battery is incorrect (I’ve confirm the discrepancy/variance by connecting to batteries directly using RS232 cable)

3. Even if one wants to assume it’s taking average of Cycle count of all batteries, this is way off

4. The battery pack size 100ah/200ah/300ah was only recently resolved in terms of reporting via a firmware update that took over 6-months to get

I must give credit and a “thumbs-up” to Freedom Won support for continued pursuit of Solis team but it’s been like pulling teeth to get Solis R&D to get stuff done.

There’s also consistent intermittent connectivity issues as well, but for me that’s more a nit pick as inverter performs very well for me and my plant. Am now headed into winter so it’ll be interesting to see how the system performs and holds up. Initially I only had 1 x 100ah eTower battery, now I have 2, so will see how efficiently it performs. Am also rather limited with a small panel bank of only 12 x 200w (2400w) generation, which had hoped to upgrade by now with additional 595w x 5 (2,975w) onto 2nd MPPT but hopefully may find reasonable priced panels given price rises caused/blamed on Iran war and fuel hikes.

That info that I would love to see seems to be available easily on Victron Plants. Also the size of Battery capacity has to be input manually as well. Would be great if BMS picked it up automatically.

Would I recommend Solis as my first choice? Likely yes for someone with an installer very well versed in the product ONLY. Otherwise, no. Installers who have general knowledge & experience, no. The placement of CT (either within the inverter or at whole house main grid input) and ability to send excess power to non-essential loads seems to elude some installers and how to the find a way to use Gen Port for this and also configure it for a generator appears not to be easy.

As a set and forget inverter it still needs some tweaking (Solis S6 6kw Hybrid Pro Single-phase).

On 2025/03/03 at 9:32 AM, Ecos said:

We have 3 different sites that are using 3 x solis (EH1P5K) and 3 BSL powerline-5(configured as a 3 phase system). We have had issues with these sites from the start. There was communication issues between inverters and batteries. related to firmware on both inverters and batteries. this has now been resolved.

The major issue that is not solved yet is the backup voltage on one phase just turns off. We have noticed its typically the L2 phase(in our 3 phase system).

This seems to be triggered by a grid supply issue of either over voltage or under voltage(when only on one inverter). The strange thing is that if the grid turns off completely the unit operates as it should.

This is a big issue and should the client have 3 phase loads, damage is very lightly without the correct protection.

We have moved away from Solis because of these issues.

The phase specific backup voltage dropout observed during partial grid disturbances e.g., over or under voltage on one phase is a standard protective feature in hybrid inverters from virtually all major brands.

High end models from Solis, Deye, Sunsynk, Growatt, Victron, SMA, and others monitor grid parameters per phase to ensure safety, compliance with local standards such as NRS 097 in South Africa, and protection of connected equipment. In grid referenced hybrid backup mode, an anomaly on a single phase typically results in isolation or shutdown of the affected phase.

A complete grid blackout transitions the system to off grid operation, where the inverters generate a stable internal reference, allowing normal function.

This response to grid conditions is an industry wide design characteristic rather than an issue isolated to any one brand.

For sites requiring reliable 3 phase backup particularly where load imbalance, grid instability, or three phase equipment are present a native 3 phase hybrid inverter, such as the Solis S6-EH3P15K-LV or equivalent models from other reputable brands, is generally more appropriate. Native 3 phase units offer inherent support for unbalanced loads across phases, simplified synchronization, and typically lower installation complexity fewer cables, fuses, breakers, and potential efficiency losses compared to paralleling multiple single phase inverters to achieve a 3 phase configuration.

System performance is influenced by numerous factors beyond the inverter itself, including Grid quality and stability from the utility e.g., voltage fluctuations, phase balance.

Site conditions e.g., earthing integrity, wiring quality, load distribution.

Correct hardware selection for the specific application and environment.

Installer knowledge and experience in configuration, parameter tuning, grid ride through settings, and matching equipment to site requirements.

Challenges in any installation often stem from these variables rather than inherent shortcomings in the product.

Selecting the most suitable hardware and ensuring professional, application appropriate installation are key to achieving reliable outcomes, regardless of brand.

22 hours ago, Moffat said:

@Pho3niX90 a different brand may have a firmware solution to mitigate this grid issue.

@AlexTZA on the whole, the inverter has worked well for me, however, my issue with Solis is with the BMS not having been set properly with Freedom Won eTower batteries. Specifically:

1. The number of batteries is not shown on the App or Webportal

2. The batteries Cycle count for each battery is incorrect (I’ve confirm the discrepancy/variance by connecting to batteries directly using RS232 cable)

3. Even if one wants to assume it’s taking average of Cycle count of all batteries, this is way off

4. The battery pack size 100ah/200ah/300ah was only recently resolved in terms of reporting via a firmware update that took over 6-months to get

I must give credit and a “thumbs-up” to Freedom Won support for continued pursuit of Solis team but it’s been like pulling teeth to get Solis R&D to get stuff done.

There’s also consistent intermittent connectivity issues as well, but for me that’s more a nit pick as inverter performs very well for me and my plant. Am now headed into winter so it’ll be interesting to see how the system performs and holds up. Initially I only had 1 x 100ah eTower battery, now I have 2, so will see how efficiently it performs. Am also rather limited with a small panel bank of only 12 x 200w (2400w) generation, which had hoped to upgrade by now with additional 595w x 5 (2,975w) onto 2nd MPPT but hopefully may find reasonable priced panels given price rises caused/blamed on Iran war and fuel hikes.

That info that I would love to see seems to be available easily on Victron Plants. Also the size of Battery capacity has to be input manually as well. Would be great if BMS picked it up automatically.

Would I recommend Solis as my first choice? Likely yes for someone with an installer very well versed in the product ONLY. Otherwise, no. Installers who have general knowledge & experience, no. The placement of CT (either within the inverter or at whole house main grid input) and ability to send excess power to non-essential loads seems to elude some installers and how to the find a way to use Gen Port for this and also configure it for a generator appears not to be easy.

As a set and forget inverter it still needs some tweaking (Solis S6 6kw Hybrid Pro Single-phase).

Thanks, you offer a balanced, practical view of the Solis S6 6kW Advanced Hybrid Pro inverter paired with Freedom Won eTower batteries.

Strengths include reliable day to day performance the inverter has worked well for the user’s setup, managed the initial 2400W PV array effectively, and is expected to perform solidly through winter with the added battery capacity.

Practical considerations include.

Native Solis monitoring shows core parameters SoC, voltage, current but often lacks full multi battery details as an example, number of modules, accurate per battery cycle counts, which is typical across brands since inverters display only what the battery BMS transmits via CAN/RS485.

Firmware updates to improve pack size reporting took several months a common timeframe for third party compatibility refinements requiring testing and coordination.

Minor intermittent connectivity issues appear occasionally, as seen in many mixed brand systems.

Features like CT placement, excess power diversion, and Gen port setup require specific adjustments, making the system less “set and forget” unless the installer has strong Solis product experience.

Similar monitoring limitations and configuration nuances occur with Victron, Deye, Sunsynk, Growatt, and others when using Freedom Won or comparable batteries.

Deeper BMS details usually need third party tools like SolarAssistant, Home Assistant or direct battery access, regardless of brand.

Your experience highlights that Solis delivers solid performance when properly configured and supported by knowledgeable installation, while third party integrations share industry wide challenges around native monitoring, occasional comms quirks, and the importance of setup expertise.

Thanks for the clear, realistic insight it helps others evaluate options effectively.

Understandable that API, App and Web portal updates would naturally take time moreso between different vendors, however over 8-months of asking for simple visibility is poor of:

1. Correct battery capacity (200ah/300ah)

2. Number of cycles for each battery pack or even averaging out the cycles (add pack-1 plus pack-2 and divide by 2) to give rough average would help

3. Information on number of parallel or series battery connections is also missing

4. Also missing is ability for system, once connected to automatically pick up total battery capacity (10kw/15kw) etc.

In short, this granular information may not be important to the average end-user but some of us do find it useful (see screenshot attached here)

I am using Solis S6-EH1P 6K-L-PLUS inverter since April 2026. Is any one having measure of energy consumed by this S6 inverters for its operation ? Please share.