Solis inverter with Dyness batteries

[localhost]

I installed Solis inverter (6kw s5-eh1p6k-l) with 2* 5.0c Dyness batteries and I have two main issue and I was wondering if anyone experienced the same.

The first problem is, the battery charging limits sometimes drops to 20amps, limiting the charging power to around 1.12kw total to charge both batteries, first I thought there is no enough solar input but there is, when I turn something in my house on, the power from solar increase to 2kwh, and once I turn it off, it drops to 1.12kwh again, and when I change the charging limit, it reset once I click save, I found online that the battery BMS is setting these values so that is why it sets to what the BMS comminicate with the inverter.

sometimes it takes hours to get the battery to like 50% and than it start charging using full solar power but usually it is too late and the sun is already about to sunset. so most of the days I lose more than 3 hours to get the battery to 50%.

I tried today to turn the inverter off completely and turn it on again and it worked and the charging limits becomes 100amps, I tried many things and same problem.

the second problem that I know it is a big problem, during the night, the load in the house is 30w and the battery is draining very fast around 210w all the night! for example yesterday I lost around 14% of the battery in around 6 hours!

yesterday, it drop from 24% to 9% in 5 minutes, just by itself, is it possible an issue with the batteries? I already contacted Dyness but there is no response, and I contacted solis and they updated the inverter to the last framework but this changes nothing.



tried to find any useful information online but nothing.

I chechek everything and replaced the RJ45 cables too, I switched the batteries from master to slave and same problem.

 

[SeaGal]

The first problem is, the battery charging limits sometimes drops to 20amps

At what SOC and temperature are the batteries when this happens?

 

[localhost]

At what SOC and temperature are the batteries when this happens?

below 40%, sometimes it is 50% or more and still 20amps
the temperature below 15C above 10C for sure

 

[localhost]

same problem today, it keeps setting charging limit to 20amps and never went above 1.12kw until it becomes 48% than it start charging 100amps, but it was already too late and charged with full power for like 15minutes to the sunset

 

[Solar Guppy]

On the SOC drop to 24-9% that is likely because the battery did not have a full charge to 100%, constant partial cycling of any battery will cause the SOC to lose accuracy

On the current limit, the BMS maybe is some type of protection mode, you would need to have an app to look at the actual parameters from the battery to better understand the "why", but since its at a low SOC protection ( 10% according the data sheet ) and in somewhat lower temperatures, it is doing what its designed to do.

I would suggest you fully charge that battery from grid and review how it acts for a day compared to what you posted, but keep in mind, if you don't have solar to charge, it can't support the loads.

 

[SeaGal]

same problem today, it keeps setting charging limit to 20amps and never went above 1.12kw until it becomes 48% than it start charging 100amps

My best guess is that the Dyness battery is (by design) restricting charge to 20A when the temp is below 15 degC. That could explain the sudden increase from 20A to the full 100A once the cells got warm enough after a period of low current charging.

To determine if that is the issue, suggest you liaise with Dyness to find out what their temp/charge rate mappings are and/or warm the battery environment and test again.

See also these threads and my postings about FoxESS and PureDrive batteries that also restrict charging below 15C.

https://diysolarforum.com/threads/charging-issue.76150/post-971701

https://diysolarforum.com/threads/solar-exporting-instead-of-charging-battery.76868/#post-981732

https://diysolarforum.com/threads/new-install-erratic-overnight-charging.72653/post-939170

https://diysolarforum.com/threads/solis-rai-not-charging-fox-ess-lv5200-correctly.50957/

 

[AshleyL]

same problem today, it keeps setting charging limit to 20amps and never went above 1.12kw until it becomes 48% than it start charging 100amps, but it was already too late and charged with full power for like 15minutes to the sunset

Can you check if the selected communication protocol is "Dyness LV"?
Refer to this video:

 

[localhost]

My best guess is that the Dyness battery is (by design) restricting charge to 20A when the temp is below 15 degC. That could explain the sudden increase from 20A to the full 100A once the cells got warm enough after a period of low current charging.

To determine if that is the issue, suggest you liaise with Dyness to find out what their temp/charge rate mappings are and/or warm the battery environment and test again.

See also these threads and my postings about FoxESS and PureDrive batteries that also restrict charging below 15C.

https://diysolarforum.com/threads/charging-issue.76150/post-971701

https://diysolarforum.com/threads/solar-exporting-instead-of-charging-battery.76868/#post-981732

https://diysolarforum.com/threads/new-install-erratic-overnight-charging.72653/post-939170

https://diysolarforum.com/threads/solis-rai-not-charging-fox-ess-lv5200-correctly.50957/

That maybe the issue since today it didn't go above 20amps until it was 58%! so maybe a temp issue.
I'm losing 60% of the daily energy unfortunately and this is a big efficiency problem, is there a way to check if this is really the issue, if so, I may need to move all the setup to inside my house instead of the garage

 

[localhost]

Can you check if the selected communication protocol is "Dyness LV"?
Refer to this video:

Yes, I'm sure it is selected

 

[localhost]

On the SOC drop to 24-9% that is likely because the battery did not have a full charge to 100%, constant partial cycling of any battery will cause the SOC to lose accuracy

On the current limit, the BMS maybe is some type of protection mode, you would need to have an app to look at the actual parameters from the battery to better understand the "why", but since its at a low SOC protection ( 10% according the data sheet ) and in somewhat lower temperatures, it is doing what its designed to do.

I would suggest you fully charge that battery from grid and review how it acts for a day compared to what you posted, but keep in mind, if you don't have solar to charge, it can't support the loads.

I have noticed one battery is 20% and the other is 22%, I'm charging both of them to 100% and trying again, also I will try to put them in a box and maybe using a space heater around them to see if the temperature is the problem

 

[AshleyL]

Yes, I'm sure it is selected

Can you check if there is any alarm at Soliscloud?
Make sure you select "all" alarm including "restored" state.

 

[localhost]

Can you check if there is any alarm at Soliscloud?
Make sure you select "all" alarm including "restored" state.

No, there are no alarms

 

[localhost]

So, after connecting each of the batteries I found out that one of them had a lower SOC than the other, so I charged both of them to 99% and they didn't want to go above 99%, I increased the absoption from 56.6 to 57 as it mentioned in the battery manual and we will see if they will be charged to 100% now.

the other thing I noticed is the temperature, today I got a battery alarm and when I check it says BMS lowTemp, so it looks like an issue with the temperature after all, because today it went below 0C, and yesterday it was 3C all the day so I think the battery temperature dropped to below 0C this morning.

any ideas how to keep them below 15C without using a heater?

 

[rpdom]

any ideas how to keep them below 15C without using a heater?

I assume you mean at or above 15°C. Insulate them.As a temporary measure I wrap mine in bubble wrap during the winter. But I'm planning to build an enclosure for them out of insulation board, but one that can be easily removed in warm weather.

Some people add heat pads.

 

[localhost]

I assume you mean at or above 15°C. Insulate them.As a temporary measure I wrap mine in bubble wrap during the winter. But I'm planning to build an enclosure for them out of insulation board, but one that can be easily removed in warm weather.

Some people add heat pads.

sorry, above 15C
I think using any sort of heating like pads will effect the battery life because of the changing of the temperature?
when I installed them I was thinking of cooling issues more than heating issues hahaha
I installed them directly to the garage wall which is metal, so it is transferring the heat out of them like a big heat sink

I think i will go with insulation board too and see if it will help

 

[SeaGal]

I guessed right

My battery is in an outbuilding. Have put 2" of PIR insulation around the batteries and and 21W of temp controlled heaters. They only come on for about 30% of the time when the outside temp is negative and keep the cells around 20 degrees C throughout Winter.

See examples in the threads I posted above.

If you are putting a reasonable charge into the batteries and discharging enough then just insulation may be enough - see the pics from @coolcarper1 further down one of my linked threads...

C

Post in thread 'Solis RHI 6K 48ES 5G Inverter Fox ESS LV5200 Battery - Charging limit ? and export to grid ...'

Dec 10, 2022

Hi All, just had my Solis 6kw inverter and two Fox LV5200s installed too and noticed exactly the same problem others were having. Charge rate was maxing out at 1300w or 24A, BMS error stating low temp on inverter. Only way of knowing via app appears to be looking at what the charge current limit is.

Just added some insulation around them (rockwool inside insulating bubble wrap) and will see if that does the job over winter months. Hoping the hest generated by the internal resistance of the batteries is enough to get it up to 15c, but hope it won't exceed 30c.

The hest mats might be a...

• coolcarper1

• 
• 

 

[localhost]

I guessed right

My battery is in an outbuilding. Have put 2" of PIR insulation around the batteries and and 21W of temp controlled heaters. They only come on for about 30% of the time when the outside temp is negative and keep the cells around 20 degrees C throughout Winter.

See examples in the threads I posted above.

If you are putting a reasonable charge into the batteries and discharging enough then just insulation may be enough - see the pics from @coolcarper1 further down one of my linked threads...

C

Post in thread 'Solis RHI 6K 48ES 5G Inverter Fox ESS LV5200 Battery - Charging limit ? and export to grid ...'

Dec 10, 2022

Hi All, just had my Solis 6kw inverter and two Fox LV5200s installed too and noticed exactly the same problem others were having. Charge rate was maxing out at 1300w or 24A, BMS error stating low temp on inverter. Only way of knowing via app appears to be looking at what the charge current limit is.

Just added some insulation around them (rockwool inside insulating bubble wrap) and will see if that does the job over winter months. Hoping the hest generated by the internal resistance of the batteries is enough to get it up to 15c, but hope it won't exceed 30c.

The hest mats might be a...

• coolcarper1

• 
• 

That is right, and nice setup btw, it looks like well insulated, I will build something for the battries too.

And this should be mentioned in the manual, it doesn't say it limits the charging power when the temp if below 15 C otherwise it is something I would have considered a long time ago before installing it the way it is now

 

[jgh]

FWIW, my Pylontechs report consistently 2 deg C above ambient, increasing to 10 above during charging.
Rise-time is on order of an hour; decay time 2 or 3 hours.

I assume that's just parasitic losses within the box, but it means that just insulating would help
in colder weather.

 

[localhost]

update here, the last couple of days were very cold (below -1c), I moved the batteries from the metal wall and put them in insolated box of "POLIESTIRENO EXPANDIDO EPS GRAFITO SATE", but it didn't help and at around 9AM the battery drops to below 20% from 25% in 5 minutes without load so same problem, yesterday I ordered 2 20w heating pads, and put them in the box with the batteries, and it works! now the battery is charging with 100amps once the sun is shining, today I'm setting a timer for the heating pads to trun on at 9AM to 10AM after that once the battery start charging it maintain the heat.
I think if I used the pads only without the box it will work too, this is what I will try next and see.
the heating pads are not expensive, cost around 15 euros each, it was better for Dyness to put the heating pads inside the batteries incase it drops below 6C for example, and it will consume like 20w, not that much compared what I'm losing when it is charging 10amps per battery, I was losing around 1.6kwh

 

[SeaGal]

Result!