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PIP-5048GK standby usage
#1
Hi everyone!

I've had my system up and running since august 2019, initally with 10* 280 Wp panels and 7 kWh of storage (14S60P, 136 Ah).
After adding the second set of packs to get 14 kWh (14S120P) and another 2 panels to better match the MPPT startup voltage of the PIP5048-GK, I'm a bit let down by the overall performance.

It seems like the PIP's own power usage is around 65 - 75 Watt, which accounts to about 1,5 kWh of losses each day.
On these winter days, I find myself charging up the batteries with grid power, only to burn it again in heat losses.  
It seems I'd better disconnect the batteries after they're charged up, to avoid them going too low from the inverter's drain.

But even if I disconnect the batteries, the 65 - 75 W needed would just come from the grid (in by-pass mode).
It seems like a terrible waste of grid power now, but a shame if I have to bypass the entire setup during winter months to avoid these losses.
As it is now, I'm consuming MORE grid power than before I added my powerwall + solar.

Is this "normal behaviour"?
PIP5048-GK, 12 * 280 Wp Solar, 14S120P (273 Ah) battery storage
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#2
Yes it is just normal. You get what you pay for.

The cheapest versions of the MPP is around 40W at 48v systems. All grid-tie/hybrid is up towards 80W per phase.
For instance my 10kW inverter is consuming 240W idle... Doesnt matter if you disconnect the battery. You need to shut it down to not pull anything.

I say this EVERY time someone asks about the "Cheap" MPP gear and still it seems people miss it Smile

There is 1 easy sollution: Sell it and buy a Victron or other name-brand system and you can easily cut that usage in half to 1/3rd Smile

Yes I would like to do that do but the other name-brands cost alot more. So Il stick with mine and i actually disable the inverter during hours when theres no sun in the winter. It saves me up to 7kWh per day Tongue
100kwh-hunter and hbpowerwall like this post
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#3
That's normal for me as well. It all depends on the placement of your panels (winters require a very high angle which roofs don't usually get) and your area. You just have to weigh in the entire month's average. If all you have is extremely cloudy days, then turn it off. During winters I still net overall a positive so I leave it on.

If you're willing to do extra work to maximize your output, then if you have a manual transfer switch, shift the load to your grid. Then turn off the inverter portion of the PIP and leave the solar charger on. That way your idle drops down to around 15W, which then leaves your battery charging via solar until it reaches 100%. Then turn the inverter back on and flip to battery until it is depleted and repeat the process.
Ibiza likes this post
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#4
(01-05-2020, 02:01 PM)wimpie007 Wrote: Hi everyone!

I've had my system up and running since august 2019, initally with 10* 280 Wp panels and 7 kWh of storage (14S60P, 136 Ah).
After adding the second set of packs to get 14 kWh (14S120P) and another 2 panels to better match the MPPT startup voltage of the PIP5048-GK, I'm a bit let down by the overall performance.

It seems like the PIP's own power usage is around 65 - 75 Watt, which accounts to about 1,5 kWh of losses each day.
On these winter days, I find myself charging up the batteries with grid power, only to burn it again in heat losses.  
It seems I'd better disconnect the batteries after they're charged up, to avoid them going too low from the inverter's drain.

But even if I disconnect the batteries, the 65 - 75 W needed would just come from the grid (in by-pass mode).
It seems like a terrible waste of grid power now, but a shame if I have to bypass the entire setup during winter months to avoid these losses.
As it is now, I'm consuming MORE grid power than before I added my powerwall + solar.

Is this "normal behaviour"?

How are your panels configured? All in series? Or two strings in parallel? Just for me not because of your problem. But I will maybe have the same problem. Quite the same setup...
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#5
I had 10 panels in series, but I often noticed that the PV voltage would be around 120 Volts, which is too low for the MPPT tracker to start up (if I have to go by the manual).
I had the opportunity get 2 more of the same panels, so the voltage coming from the panels should be 20% higher.
It still shows voltages around 120 V, but the batrium shunt measures current coming into the batteries. So while the PIP doesn't show PV Watt output, there is some, though only about 130 W (75 W standby usage of the PIP5048-GK and 55 W going to the battery pack)


Regarding the usage of the inverter, I'll add a button to by-pass the setup entirely so I can shut it down on the darkest days of the year.
Upgrading to the Victron as Daromer suggested is a plan for later on. I'm hoping I can get some savings on my power bill when using the MPP Solar first.
PIP5048-GK, 12 * 280 Wp Solar, 14S120P (273 Ah) battery storage
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#6
Wimpie what's the VMPP of your solar panels? Or better what panels do you use? Do you have a datasheet?

Very strange that you don't see anything in PIP Software. Is that usual to it?
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#7
Look in the victron shelf... they do it for much less standby consumption... they‘ve got some cheaper solutions recently...
30kWh 5x 14s80p with 5x40A China BMS. 14kWH LiFePo4 is in production.
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