Solar generation in rain/cloudy conditions

wingnut771 said:
Nah, I've been watching Andy for 5+ years and he has sizes 100Ah-600Ah paralleled together. All that happens is the bigger capacity battery takes more of the load than smaller capacity while the parallel connection keeps voltages balanced and identical automagically.

Ask him what issues they had. Your installer is just taking the piss imho. Maybe he doesn't want the drama of trying to get comms working with different brands or something? Me personally I will forget about comms and just use voltage mode. This will void a sunsynk warranty I think so just buy the cheapest crap out there.

Andy even demonstrated an extreme example of paralleling a 5Ah with 300Ah. The 5Ah took a smidge of the load while the 100Ah took the rest.

Not sure why I'm bothering posting the video as no one watches them anyway because they are "too long" but here it is for what its worth :P

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This was actually a very informative and interesting video, thanks for that - interesting how the batteries behave when charge is applied, learnt something new today!
 
Apparently rain is going to stop soon... Brilliant weather prediction there
 
BLG said:
SOC 12% 😶 that can't be too good for the battery
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Wouldn't worry. 48V or 10% and up is perfectly fine.

@wingnut771 will say 40 and up, but he does push things lol.

Fun fact, btw, if you drain to 10% every day and have another battery bank that gets drained to 50% everyday. You will get similar lifespans from both batteries because calendar ageing is worse for LFP than the number of cycles.

That is one of the reasons I will probably never buy a second LFP for my second inverter. I would rather drain it when needed to 10% than get a second battery and have them at 50% all the time. It's a waste of money.

Would only buy a second battery if it means I will mostly hit 30%and under by morning.
 
I suddenly have an appreciation for the sun, not even 9am yet and we pulling 3.3Kw - Johnny Nash said it best - gona be a bright, bright, sun shiny day 🌞


Screenshot 2026-06-02 085601.jpg
 
denmendez65 said:
Wouldn't worry. 48V or 10% and up is perfectly fine.

@wingnut771 will say 40 and up, but he does push things lol.

Fun fact, btw, if you drain to 10% every day and have another battery bank that gets drained to 50% everyday. You will get similar lifespans from both batteries because calendar ageing is worse for LFP than the number of cycles.

That is one of the reasons I will probably never buy a second LFP for my second inverter. I would rather drain it when needed to 10% than get a second battery and have them at 50% all the time. It's a waste of money.

Would only buy a second battery if it means I will mostly hit 30%and under by morning.
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I would drain it to 5% if I could if not for sunsynk 10 year warranty hoops and bms not allowing lower than 49V even if I wanted to.
 
denmendez65 said:
Light only hits my panels at 7:15. About 100W generation at that time. 8am about 500W. 9am 1.5kW and increasing.

By 3 back to 1kW and by 4 only 100W or so again.
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Yeah I'm getting around 250 at 7:15 and only really start hitting 2 around 08:30. At 4pm I am around 800 but by 4:15 it drops dramatically to 400
 
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