My new 3kw 25v 60a off grid system only worked for 1 day

[Tank]

Hi, I have recently bought a 3.5kw 24v 60a ecco inverter, I installed it around 3pm in the evening with 2 550watts solar panels in series and 2 12.8v 100AH lithium batteries in series also, the batteries had power as they were new, and the was working with the batteries, then after 5 min i switched on the solar panels to charge and the system responded perfectly, the following morning light were off and TV was off too with the inverter warning on screen code 6P.

Seems like only 1 battery is charging as I left the panels to power the batteries but only 1 battery is with power the other is fully discharged.

 

[Tank]

Hi, this is the the error

 

[wpns]

Your new batteries were probably not charged, and batteries don’t work well in series without some kind of equalizer or inter-battery balancer.

Those specs on that inverter don’t make sense, your batteries are only going to supply about 100A (2400W).

Can you start over with specs on the various components and how they are wired? Pictures would be very helpful.

Looks like one of your batteries BMS disconnected to protect itself from undercharge.

 

[Tank]

Your new batteries were probably not charged, and batteries don’t work well in series without some kind of equalizer or inter-battery balancer.

Those specs on that inverter don’t make sense, your batteries are only going to supply about 100A (2400W).

Can you start over with specs on the various components and how they are wired? Pictures would be very helpful.

Looks like one of your batteries BMS disconnected to protect itself

 

[Tank]

I have 2x 550watts solar panels connected in Series.
2x 100ah 12.8v lithium batteries connected in series
1x 3.5kw 24v inverter, I'll upload pics soon

 

[juliawhites]

Hi, I have recently bought a 3.5kw 24v 60a ecco inverter, I installed it around 3pm in the evening with 2 550watts solar panels in series and 2 12.8v 100AH lithium batteries in series also, the batteries had power as they were new, and the was working with the batteries, then after 5 min i switched on the solar panels to charge and the system responded perfectly, the following morning light were off and TV was off too with the inverter warning on screen code 6P.

Seems like only 1 battery is charging as I left the panels to power the batteries but only 1 battery is with power the other is fully discharged.

It sounds like there might be an issue with how the batteries are connected or with the inverter's charging system. Double-check the battery connections and consult the inverter’s manual for troubleshooting the 6P error code.

 

[timselectric]

Your batteries were not full when you received them. Batteries ship at around 30% to 50% SOC.
You need to separate them and charge them fully before putting them in series.
And be prepared to do this a few times a year. As BMS controlled batteries in series will drift apart from each other. This is why it is not recommended to do it.

 

[Tank]

It sounds like there might be an issue with how the batteries are connected or with the inverter's charging system. Double-check the battery connections and consult the inverter’s manual for troubleshooting the 6P error code.

Hi, 1 of the batteries was not charging, I've tested and 1 was fully discharged, I then charged it with a car booster then put it back, boom the inverter worked again, what could cause the system to charge only 1 battery?

 

[Tank]

It sounds like there might be an issue with how the batteries are connected or with the inverter's charging system. Double-check the battery connections and consult the inverter’s manual for troubleshooting the 6P error code.

Hi, I've charged the other battery with car charger and put it back, it worked well, I suppose the balancer will be a solution, thank you for the advice

 

[Tank]

Your batteries were not full when you received them. Batteries ship at around 30% to 50% SOC.
You need to separate them and charge them fully before putting them in series.
And be prepared to do this a few times a year. As BMS controlled batteries in series will drift apart from each other. This is why it is not recommended to do it.

Hi, problem is I have 2 12.8v lithium batteries powering a 24v inverter, hence I've put them in series to power the 24v inverter, how will I charge them fully separately?

 

[timselectric]

how will I charge them fully separately?

Unhook them and connect them individually to a charger. And then put them in parallel for a while so that they are equally balanced.
Then you can put them back in series, for your system. (Until they get out of balance again)

 

[KnobCountry]

I've had decent success with the ha01 balancers at approx $25.

They will keep the series batteries pretty close unless you are cycling them very heavily. Real world balance current for those is like 2-3 amps. 5 max. As long as the batteries get an occasional 'rest' from constant cycling they should stay close.

 

[740GLE]

Also it’s key to know you are actually charging them fully.

“Charging them with a car charger” most likely won’t do a whole lot vs wake the BMS up unless
You let it sit a long long time.

A car charger at say 10amps will take +10hrs to charge one dead 100ah battery, if the cells are unbalanced it might hit over voltage protection and your 100ah battery may actually be functioning at 80-90ah.

Also be mindful of idle load of that inverter. Even though it may not be powering something worthwhile in the overnight, it’ll still drain the batteries. Knowing it’s idle consumption is key for knowing what your batteries can do. 10w idle is hugely different than say 50w-75w in idle.

ECCO 3.5KW MPPT Hybrid Solar Inverter 24V - 100A

The ECCO 3.5KW MPPT Hybrid Solar Inverter 24V - 100A is a high-quality, pure sine wave solar inverter with a power factor of 1. It offers a wide input voltage range for efficient solar power conversion and comes with a built-in 100A MPPT solar controller. With its multiple output priority...

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Is this the inverter you picked up?