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How to analyze issue of max series based on History data

Datalogger will upload many important data into server. They are stored in History data. You can download it and read key parameters.

1. How to download History data from server

Please note that just Distribuotr or installer or Our service engineer account can download history data.

a. Access OSS account via
b. Download History data
c. History data as excel form
d. Introduction about all important data in histoy data
1 ) model A0B0D0T4PFUDM8S1


Safety Type, The high byte part which is Used with low byte Sx


SVG/APF enable; Dual communication/anti-backflow enable (M3)


D0: Neutral Inverter
D1: Standard Inverter
D4: Universal Inverter
D5-DF: other models, etc., different models are different


Function mode selection

Bit0: PV-ground mode
Bit1: PID enable
Bit2: String monitoring enable
Bit3: reserved


Safety protection enabled, Use Bit to represent different security protections

Bit0: ISO enable
Bit1: DCI enable
Bit2: GFCI enable
Bit3: Customer protection scope customization enable


Three-phase rated voltage range, MPPT channels, AFCI enable

BIT0-BIT1: AC voltage level
(0: AC277V, 1: AC230V, 2: AC288V, 3: AC127V)
BIT2: Number of MPPT channels
(0: Six way 1: Seven way)
BIT3: AFCI enable


power segment

Different models of power segment
MAX project
MB: 25KW
M3: 30KW
MC: 35KW
M4: 40KW
M5: 50KW
M6: 60KW
M7: 70KW
M1: 75KW
M9: 90KW
MA: 100KW


the low byte part of types of safety standards which is used with high byte Ax

The safety standard type AxSx is 8-byte data.
Current safety regulations such as safety standard Model corresponding table

2 ) Vp1-Vpx
3 ) Ipv1(A)-Ipv7(a)

It shows MPPT current of Every PV string.

3 ) ppv1(w)-ppv7(w)

It shows Ppv1(w)-Ppv7(w)

4 ) Epv1Today-Epv7Today
5 ) vacRS(V), VacST(v), vacTR(V)

VacRS is the line voltage between R and S phase

VacST is the line voltage between S and T phase

VacTR is the line voltage between T and R phase

5 ) IacR(A), IacS(A), iacT(A)
6 ) PacR(vA), PacS(vA), PacT(vA)

PacR(vA), PacS(vA), PacT(vA) shows apparent power

7 ) VacR(v), VacS(v), VacT(v)

VacR(v), VacS(v), VacT(v) shows Phase voltage

8 ) Fac(HZ)
9 ) Fac(HZ)

PF shows power factor value: -1~1

10 ) BUS+ ,BUS-

Normal BUS voltage value is 200-1000V

11 ) INVTemp, AMtemp1, BTTTemp


INV circuit ( DC-AC ) has 3 INV module ( Temperature sensors have integrated in it)


BTT is abbreviation of Boost Circuit, which has 3 Boost modules( Temperature sensors have integrated in it )


Ambient Environment Temperature



12) FaultCode

You can search fault code info. from user manual. based on the fault code.

13) FaultBit
14) WarmCode, WarnBit
15) DegradeMode

For more details, please visit password; degrade20220625

16) PV ISO

PV ISO value is used to confirm earth issue on PV side. Once it exceeds  50KΩ , the inverter will alarm. Normal value is 65532


The meaning of DCI is that in one cycle, positive wave value of AC current +negative wave value of AC current =0 for normal situation, once DCI value is not 0, it means the inbalance between positive wave and negative wave is occuring. It may be caused by Grid or inverter by itself.

DCi explanation:
DCi goes 0 when the sum of sampling currernts is zero,
otherwise there will be a DCi bias value showing in history data.
The standard DCi value is less than 0.5% of the maxinum current in AC output at fulll load.
It will affect the AC output quality if an inverter produces high DCi .


PID circuit is like BOOST circuit, which is used to promote the voltage between positve and earth, this BUS voltage is formed by PID circuit.

18) GFCI

Ground fault circuit interrupter

GFCI is used to judge if AC side has earth issue, the principle is like RCD, once 3 phase inbalance, it will detect the current. In usual, it should be less than 30mA.

level1: leakage current>30mA-off grid reaction<200ms

level2: leakage current>60mA-off grid reaction<60ms

level3: leakage current>150mA-off grid reaction<20ms

19) Debug1

Debug1 value is from 28067 Chip

Example: 0,0,0,250,32998,0,7434,7858

Input Register 182: 0

it means Boost software Over current protection count, once triggered, it will increase 1

Input Register 183: 0

It means Boost software Over current channel , the specifical route number last time

Input Register 184: 0

Over current Triggering value last time

Input Register 185: 250

Boost current limitation value

Input Register 186: 32998

System status High bits

Input Register 187: 0

System status Low bits

Input Register 188: 7434

limitation value of The first PV route

Input Register 189: 7858

BOOST side BUS voltage limitation value

19) Debug2

Example: 0,0,0,0,4,127,18870,4197

Input Register 190: 0

It means INV OCP( Over Current Protection ) count, once triggered, it will increase 1

Input Register 191: 0

It means BOOST OCP( Over Current Protection ) count, once triggered, it will increase 1

Input Register 192: 0

Driving fault count, once triggered , it will increase 1

Input Register 193: 0

INV software OCP( Over Current Protection ) count, once triggered , it will increase 1

Input Register 194: 4

Degrade mode, when degrading , the value is not 0. It equals vaule on Degratemode column

Input Register 195: 127

When degrading, it will limit the value, if not, the value is 80KW

Input Register 196: 18870

RelayCheck steps and time

The ten thousand digit indicates that the inverter PWM has been detected and the OK mark is displayed, the thousand digit represents the number of steps, and the following one represents the timing( like 870 ) .

For more details about meaning of the timing , please find Relay fault in password: meaning20220625

Input Register 197: 4197

SPS malfunction Count, once triggered, it will increase 1

19) Debug3

it is useless

19) ReactPower(Var)

For more info. about reacitve power , please read the post

password: explore20220621

20) isAgain

True -uploading missed data after being offline

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