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I have a 2600w solar array all on separate 100/50 MPPT's. On average it's producing around 800w even if my batteries are from 60-90%. But if i turn on a high load it jumps to 1500w. My question is why doesn't it charge at 1500w even when my battery are at 60%?
What components do you have? Settings? Some screenshots?
I have 4 330ah life-po4 ,smart shunt ,two 12/2000 Multi in parallel, 2 battery Protect 2 Orion 12/30 DC DC charges for alternators, four 545w panels each on own 100/50 mppt, two 160w panels in series on own 100/30 mppt. All my settings are set to life-po4. My mppt setting are 10-14v
But for some reason my PV watts doesn't exceed 8pp-1000 unless I'm using a large load even if the batteries aren't at 100%
Cerbo GX
Always worth triple checking connections.
Is Cerbo DVCC enabled?
If so, do you have a charge current limit set? If so, that's a charge limit, and the GX will not permit charging to exceed that TOTAL value from all connected sources, i.e., if set to 50A, it will prevent all the MPPT and the MP charging from AC-in from sending more than 50A to the battery. Period.
That value does not affect loads. If loads pull battery voltage down, the Cerbo will only restrict charging. The chargers can supply as much as they're able to power the loads.
Thank you i did have it set to 50 . What would you recommend the setting be at?
50A means 50A * 14.5V = 725W into the batteries. Only loads can force more PV power.
If you do not need to restrict charge current, and with 1470Ah of LFP battery capacity, I would say you don't - you're good to 500A+, turn that feature off unless you want to restrict charging.
The most common reason for this is batteries that can't safely accept the full output of all attached chargers. Lead-acid batteries typically can only take 0.1-0.2C where LFP can typically take 0.5C+, so it's common to use this feature to ensure the lead-acid batteries do not receive excessive charge current. With LFP, this is more often a concern due to a BMS limitation.
If your full PV output + your two MP at full charger output would exceed your battery charge rating, I would limit it to that value.
The Max charge rating for victron 330ah are 400amps. Should I keep it at 300 just to be safe?
Isn't each MP only capable of 80A charging for 160A total?
60A on the Orions
2136W in solar for 167A@12.8V
So assuming all chargers are operating at max possible output (They NEVER will)...
387A
With 4 in parallel, theoretically you could go to 1600A (minus a little for uneven current sharing).
Even with the recommended charge current of < 150A, 4 of them puts you at 600A.
You are certainly free to limit it however you like, but your equipment can't even deliver the maximum charge current for a single battery, let alone 4 in parallel.
"supposed to"... not really. They "can" but that requires that all 4 cells in each 12V be perfectly balanced and hit 2.5V at the same time. Most batteries are top balanced to favor trouble free charging and will disconnect somewhere above 10V during a discharge.
You may be experiencing the BMS in the batteries cutting off the inverter due to a single cell in the battery dropping below 2.5V. Can you track cell voltages?
FWIW, between 12V and 10V, there's only about 7-8% capacity.
IMHO, I think you're pushing the batteries too low.
Victron ratings:
80% DoD is going down to 20%. You're going down to 0% (100% DoD). That means you're going to get LESS than the stated 2500 cycles.
I certainly don't have that impression. If it's true, everyone is doing it wrong UNLESS they have other primary means of disconnect - based on SoC, etc.
What are you using the battery protects for?
The 330ah doesn't come with a built in BMS. I'm using VE bus BMS
@MAXTOSEA @snoobler I've read all over this forum that everyone sets their low voltage to 10v even on the battery Protect one of the default settings for life-po4 is 10.5
You can only draw your battery down until the first cell goes under 2.8v (or 2.6v if you want to push your luck)
Have a look at the Lithium Battery Smart manual.
I have 4 330ah life-po4 ,smart shunt ,two 12/2000 Multi in parallel, 2 battery Protect 2 Orion 12/30 DC DC charges for alternators, four 545w panels each on own 100/50 mppt, two 160w panels in series on own 100/30 mppt. All my settings are set to life-po4. My mppt setting are 10-14v
But for some reason my PV watts doesn't exceed 8pp-1000 unless I'm using a large load even if the batteries aren't at 100%
Cerbo GX
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