Solar generation in rain/cloudy conditions

Lupus said:
Never understood why people buy that, just get a timer or a sonoff timer :-)
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It's to not manage the battery usage etc when the clouds hit. From reviews the geyser controllers work well in the cloudy weather with just 1KWp of panels. Also more available capacity on the inverter which I do need.
 
denmendez65 said:
Very true. But I don't want to invest in more GEL batteries to expand the bank. Would rather wait for the capacity to drop to a point where they need replacement and then build a similar bank to yours. That might take a while, though.

As for usage, I don't have anything more to run lol. That's why the aircon idea. My wife's younger sister is on her holiday break, and she's been with us for a week.

Even with 3 people, the only thing that has increased is geyser consumption from an average of 5kwh to 7kwh nowadays (Both her and my wife are using the bath and not showering. She was on the TV till 3 am today, and the batteries were still at 70% in the morning.

I genuinely have nothing else to do with the power.
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Yeah hard to tell guests to not use power :-)
 
wingnut771 said:
Get the cheapest one.
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One with active balancing on each cell and individual cell monitoring. I am seeing guys with Svolt ones getting issues with cell imbalances 2 yrs in. The Plyontech ones seem to be kak also. Power forum is riddled with posts about them giving up.
 
denmendez65 said:
This is my first spring with solar, and the generation difference between winter and now is pretty large. When I left home at 8 am, the batteries were getting almost 80A/2KW.

In winter, at the same time, some 25A/600W.

At 9 am, they are already finishing up the absorption state and getting into float now, and the summer solstice is still to come.
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Not enough battery/load

Yea
to keep the panels busy with load all day isn't easy , battery has to be in play mid day to get the most out of a system
 
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denmendez65 said:
Very true. But I don't want to invest in more GEL batteries to expand the bank. Would rather wait for the capacity to drop to a point where they need replacement and then build a similar bank to yours. That might take a while, though.

As for usage, I don't have anything more to run lol. That's why the aircon idea. My wife's younger sister is on her holiday break, and she's been with us for a week.

Even with 3 people, the only thing that has increased is geyser consumption from an average of 5kwh to 7kwh nowadays (Both her and my wife are using the bath and not showering. She was on the TV till 3 am today, and the batteries were still at 70% in the morning.

I genuinely have nothing else to do with the power.
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Spend R1k (price of 5kw minus selling 3kw) and upgrade inverter to 5kW and then connect geyser and throw away geyserwise, then add the 4 extra panels to current setup.

Be our mybb guinee pig again and buy 2 x 12V LFP and have one string of 2 gels and 2 lfp.
1759474130438.png
 
denmendez65 said:
One with active balancing on each cell and individual cell monitoring. I am seeing guys with Svolt ones getting issues with cell imbalances 2 yrs in. The Plyontech ones seem to be kak also. Power forum is riddled with posts about them giving up.
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Thats why I say to buy the cheapest. I'm sure they all have active balancing these days. Better yet, just build your own and add your own JK BMS. This way you dont have to deal with welded terminals one day when you want to replace a faulty cell.
 
wingnut771 said:
Spend R1k (price of 5kw minus selling 3kw) and upgrade inverter to 5kW and then connect geyser and throw away geyserwise, then add the 4 extra panels to current setup.

Be our mybb guinee pig again and buy 2 x 12V LFP and have one string of 2 gels and 2 lfp.
View attachment 1852956
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I watched the William guy on YT, i think his name was. Temu Lipo is not the best idea lol. Bad soldering, the BMS was supposed to be 200A and the one he had only had 100A. Capacity was only 60% of the stated kWh.

I will build my own with EVE cells and JK BMS. It has active balancing and individual cell monitoring. If a cell gives up, I just replace the one. Dont have to be dealing with warranty claims etc.
 
denmendez65 said:
One with active balancing on each cell and individual cell monitoring. I am seeing guys with Svolt ones getting issues with cell imbalances 2 yrs in. The Plyontech ones seem to be kak also. Power forum is riddled with posts about them giving up.
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I don't know of any that has an active balancer

Yea the quickest way to ruin a battery/some cells is out of balance cells

If it drifts with a passive balancer
No amount of charge change behaviour can get it balanced

The only way is to open the batteey and do manualy or active balancer
 
leon.davibe said:
I don't know of any that has an active balancer

Yea the quickest way to ruin a battery/some cells is out of balance cells

If it drifts with a passive balancer
No amount of charge change behaviour can get it balanced

The only way is to open the batteey and do manualy or active balancer
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Maybe the Deye, dyness etc. have the active balancers. Not sure.

Active balancing is a must. I have balancers on my GELs batteries and it was the best investment I made despite the 2.5k I spent on them. Almost a year in and the batteries are within 0.05V of each other. I can monitor the voltage of each battery also via an app.
 
denmendez65 said:
I watched the William guy on YT, i think his name was. Temu Lipo is not the best idea lol. Bad soldering, the BMS was supposed to be 200A and the one he had only had 100A. Capacity was only 60% of the stated kWh.

I will build my own with EVE cells and JK BMS. It has active balancing and individual cell monitoring. If a cell gives up, I just replace the one. Dont have to be dealing with warranty claims etc.
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Capacity testing you gotta get cells in balance again first

Have a shoto that only tested 25%

After balance tested 50%

One bad cell, haven't gotten around
To replacing the cell
 
denmendez65 said:
Maybe the Deye, dyness etc. have the active balancers. Not sure.

Active balancing is a must. I have balancers on my GELs batteries and it was the best investment I made despite the 2.5k I spent on them. Almost a year in and the batteries are within 0.05V of each other. I can monitor the voltage of each battery also via an app.
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Balancers are none negotiable with series connections.
 
denmendez65 said:
Maybe the Deye, dyness etc. have the active balancers. Not sure.

Active balancing is a must. I have balancers on my GELs batteries and it was the best investment I made despite the 2.5k I spent on them. Almost a year in and the batteries are within 0.05V of each other. I can monitor the voltage of each battery also via an app.
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I don't think so

Yea allways on balancer works great on acid batteries

On lifpo4 it has got to switch off under 3.35-3.45v otherwise they do he opposite and drag batteries out of balance

Edit : All lifepo4 BNS's behave this way after market active, some don't
 
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leon.davibe said:
I don't think so

Yea allways on balancer works great on acid batteries

On lifpo4 it has got to switch off under 3.35-3.45v otherwise they do he opposite and drag batteries out of balance
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That could be a reason for the early failures on the Svolt and Plyontech. The guys might be draining them to very low levels and they lose their balance.
 
denmendez65 said:
Very true. But I don't want to invest in more GEL batteries to expand the bank. Would rather wait for the capacity to drop to a point where they need replacement and then build a similar bank to yours. That might take a while, though.

As for usage, I don't have anything more to run lol. That's why the aircon idea. My wife's younger sister is on her holiday break, and she's been with us for a week.

Even with 3 people, the only thing that has increased is geyser consumption from an average of 5kwh to 7kwh nowadays (Both her and my wife are using the bath and not showering. She was on the TV till 3 am today, and the batteries were still at 70% in the morning.

I genuinely have nothing else to do with the power.
Click to expand...
If the geyser isn't on the solar that is where i would spend my efforts

If overnigt is on battery already

Smaller element on geyser To put on inverter is what i would do
 
denmendez65 said:
That could be a reason for the early failures on the Svolt and Plyontech. The guys might be draining them to very low levels and they lose their balance.
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Either bad cell selection (different resistances) or did not get a propper balance at assembly paired with passuve balancer

Likely the first imo
 
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