exciting times ahead !
}
I will surely do,exciting times ahead !
hope you post some updates after you get your new equipment installed!
{and for the record: it's all @42OhmsPA 's fault for getting the SRNE bug, and then spreading it to the rest of us !
I normally run closed loop with the maximum charge voltage at 55.2 through my BMS (actually I use YamBMS to combine multiple JK-BMS with more configurability than the default JK parallel implementation, but I get the same behavior direct from one or both BMS as well,) but this is what I tried last when running open loop and it didn't really change anything. As far as I can tell the only configurable parameters that would possibly cause that behavior would be the maximum charge voltage or the battery stop discharge current, but it wasn't reaching either of those, charging voltage was consistently below the setpoint, and charging current was consistently above the setpoint, at least from what I could see on the inverter display and/or reading data from it over RS485. Soon after I collected that data I ran one of the batteries isolated with a bench supply charging it for a bit so that I could try to get some actual balancing in, and it showed stable voltage/current unlike what I was seeing with the inverter charging, so it wasn't the BMS cutting out.
That's what I thought might be happening, but it was only getting to 55.0 when it was set to 55.2, and when I bumped it up to 55.6 then 56.6 it was still showing the same behavior and bouncing off of 55.0V, you can see that in my first plot. Reported inverter battery voltage seem to sit about 0.05-0.15V higher than measured at the cells (depending on current,) and what the BMS reports. I didn't get a measurement actually at the inverter terminals while charging, so that might be something to check when I do my next charge to 100%.While discharging at about 37a on the pack right now I'm measuring I see 52.05 at the inverter terminals, it reports 52.0V, the pack terminals show 52.13, the BMS reports 52.14 and the cell terminals show 52.15V. They all should be closer near the end of a charge when less than 10A is flowing though.
Yeah, I thought it might be something with the BMS, but it was still doing it running open loop (was in open loop when charging current limit is flat from 3:35 on in the following plot.) Also, when I was seeing it closed loop both YamBMS and the inverter was still showing a requested charge current of well over 100A even when the discharges started.
I'm betting it behaves differently once this is done.
Preliminary results of SPI-10K-UP vs. MPP LV6548s with fewer than 24 hrs. operation:
[small]| Maximum input power | 11,000W |
| Maximum input current | 22/22A |
That might work for over-paneling with SE and SW arrays.
A parameter number should be sufficient. If it's there though I'm not seeing it.
it's 11kW total for each inverter.Does this mean that it's 11kW per MPPT or 11kW total? It seems like total, but then only one MPPT could be at 22A.
I'm running 7S2P 370W on my S facing ground mount, it works great.
The cells aren't amazingly balanced, mostly due to this behavior cutting off the balancing cycles, but I also wasn't seeing any hit or really come near the OVP threshold. Charging off a bench supply at the same voltage showed a nice continuous current plot, though admittedly the available current it could supply was much lower so they runner cells wouldn't run as much.
Screen always on
Thanks, but I'm guessing that's the HESP because that menu looks completely different than the SPI-10K-UP/SRNE ASP48100U200-H that I have.
Did you try it in Inverter Logic with the BMS set to Disable to see how it performed with some sun in that case?
