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Author Topic: Growatt SP2000 - battery charging less each day?!  (Read 251 times)
bmouthrob
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« on: July 10, 2018, 11:07:53 PM »

I have had my Growatt SP2000 hooked up to the standard 4.8KWh Lithium battery for a couple of months or so. All was going great, until about 5 days ago when it only charged to 95%.
This has point at which the battery will charge no further has been decreasing quite rapidly each day and today it has only charged to 60%; it actually stopped charging around 1pm and there was plenty of solar after this (see attached - you can see that beyond around 1pm it just starts dumping out to the grid on the graph).



Has anyone ever come across anything like this before as I have scoured the 'net and can't find a thing.

Thanks.
« Last Edit: July 10, 2018, 11:11:35 PM by bmouthrob » Logged
RIT
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« Reply #1 on: July 10, 2018, 11:19:17 PM »

If your supplier can't help it may be best to just call their UK number, I found the following on the net

     UK Subsidiary contact: Service Line: +44 75 8555 9688, Email: UK.sales@ginverter.com
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2.4kW PV system, output can be seen at  - https://pvoutput.org/list.jsp?userid=49083

Why bother? - well, there is no planet B
nowty
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« Reply #2 on: July 10, 2018, 11:47:07 PM »

Have you noticed getting any BMS errors displayed on the controller, especially when it halts charging ?

What does the controller say the battery voltage is at its highest state of charge ?

You might be getting an out of voltage balance error which then later clears itself on discharge. But the offending cell(s) gets more out of balance through each charge cycle.

I had this on consecutive days on one of mine last mid summer when it hit 98% in full sun.
« Last Edit: July 10, 2018, 11:50:03 PM by nowty » Logged

10kW of PV and 40+ MWh's generated.
Battery storage of 20 kWh lead acid + 50 kWh lithium.
Heat storage of 10 kWh hot water + 15 kWh storage heaters.
190,000+ litres of water harvested from underground river.
A few cold frames and raised beds.
bmouthrob
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« Reply #3 on: July 11, 2018, 10:11:57 PM »

I've shut it all off now to limit further damage!

I'll put it on for a recharge cycle tomorrow and let you know the results.

Thanks.
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linesrg
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« Reply #4 on: July 12, 2018, 04:52:19 AM »

Good Morning All,

I'm pretty certain that I'm seeing something similar here with my set-up and I was getting BMS errors. Will need to look at it at some point.

Regards

Richard
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16 BP380 on a Lorentz ETATRACK1000/SB1700, 16 Chinese 80W/SB1700, 16 BP380/SMA SB1700. CTC GSi12 + Ecosol + Flowbox 8010e/Gledhill ASL0085 EHS/3 Navitron 4720AL solar ET panels and Immersun T1060/ T1070/ T1090. 7 Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery and a Renault Zoe
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