Find replacement for TommaTech TT520-108TNB12R

520 W TOPCon solar panel with 108 cells. Voc 40.35 V · Isc 16.07 A · TcVoc -0.25%/°C.

Original Panel

Select the panel you want to replace

Same technology onlyShow only panels with matching cell technology

Compatible Replacements

52 panels found · 3378 panels excluded

Canadian Solar CS6.2-54TM-520

520 W

TOPCon

96Exact match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.4 V	0.1%
Vmpp	34.15 V	34.2 V	0.1%
Isc	16.07 A	16.2 A	0.8%
Impp	15.23 A	15.22 A	0.1%
TcVoc	-0.25 %/°C	-0.25 %/°C	±0.000 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

Canadian Solar CS6.2-54TM-515

515 W

TOPCon

92Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.2 V	0.4%
Vmpp	34.15 V	34 V	0.4%
Isc	16.07 A	16.15 A	0.5%
Impp	15.23 A	15.16 A	0.5%
TcVoc	-0.25 %/°C	-0.25 %/°C	±0.000 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

TommaTech TT515-108TNB12R

515 W

TOPCon

90Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.15 V	0.5%
Vmpp	34.15 V	33.95 V	0.6%
Isc	16.07 A	16.01 A	0.4%
Impp	15.23 A	15.17 A	0.4%
TcVoc	-0.25 %/°C	-0.25 %/°C	±0.000 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

TommaTech TT525-108TNB12R

525 W

TOPCon

90Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.55 V	0.5%
Vmpp	34.15 V	34.35 V	0.6%
Isc	16.07 A	16.13 A	0.4%
Impp	15.23 A	15.29 A	0.4%
TcVoc	-0.25 %/°C	-0.25 %/°C	±0.000 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

Canadian Solar CS6.2-54TM-510

510 W

TOPCon

84Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40 V	0.9%
Vmpp	34.15 V	33.8 V	1.0%
Isc	16.07 A	16.1 A	0.2%
Impp	15.23 A	15.1 A	0.9%
TcVoc	-0.25 %/°C	-0.25 %/°C	±0.000 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

Trina Solar TSM-NEG18R.28-505

505 W

TOPCon

82Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.3 V	0.1%
Vmpp	34.15 V	33.5 V	1.9%
Isc	16.07 A	15.89 A	1.1%
Impp	15.23 A	15.09 A	0.9%
TcVoc	-0.25 %/°C	-0.24 %/°C	±0.010 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

Trina Solar TSM-NEL18R-505

505 W

TOPCon

82Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.3 V	0.1%
Vmpp	34.15 V	33.5 V	1.9%
Isc	16.07 A	15.89 A	1.1%
Impp	15.23 A	15.09 A	0.9%
TcVoc	-0.25 %/°C	-0.24 %/°C	±0.010 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

Trina Solar TSM-NEG18R.20-505

505 W

TOPCon

82Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.3 V	0.1%
Vmpp	34.15 V	33.5 V	1.9%
Isc	16.07 A	15.89 A	1.1%
Impp	15.23 A	15.09 A	0.9%
TcVoc	-0.25 %/°C	-0.24 %/°C	±0.010 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

Trina Solar TSM-NEG18R.25-505

505 W

TOPCon

82Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.3 V	0.1%
Vmpp	34.15 V	33.5 V	1.9%
Isc	16.07 A	15.89 A	1.1%
Impp	15.23 A	15.09 A	0.9%
TcVoc	-0.25 %/°C	-0.24 %/°C	±0.010 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

TommaTech TT510-108TNB12R

510 W

TOPCon

81Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	39.95 V	1.0%
Vmpp	34.15 V	33.75 V	1.2%
Isc	16.07 A	15.95 A	0.7%
Impp	15.23 A	15.12 A	0.7%
TcVoc	-0.25 %/°C	-0.25 %/°C	±0.000 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

TommaTech TT530-108TNB12R

530 W

TOPCon

80Good match

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.75 V	1.0%
Vmpp	34.15 V	34.55 V	1.2%
Isc	16.07 A	16.19 A	0.7%
Impp	15.23 A	15.35 A	0.8%
TcVoc	-0.25 %/°C	-0.25 %/°C	±0.000 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

Trina Solar TSM-NEL18R-510

510 W

TOPCon

79Acceptable

Parameter	Original	Replacement	Deviation
Voc	40.35 V	40.6 V	0.6%
Vmpp	34.15 V	33.7 V	1.3%
Isc	16.07 A	15.93 A	0.9%
Impp	15.23 A	15.14 A	0.6%
TcVoc	-0.25 %/°C	-0.24 %/°C	±0.010 %/°C
TcPmax	-0.29 %/°C	-0.29 %/°C	±0.000 %/°C

String Compatibility Calculator

Verify the replacement panel works with your inverter

Panel Matcher

Find all compatible panels for a specific inverter

Already have panels?

Find an inverter that fits your panel array with the right MPPT range and DC/AC ratio.

How the Algorithm Works

Learn how panels are scored and matched

Original Panel Specs

Voc

40.35 V

Vmpp

34.15 V

Isc

16.07 A

Impp

15.23 A

TcVoc

-0.25 %/°C

TcPmax

-0.29 %/°C

Pmax

520 W

Cells

108

Length

1965 mm

Width

1134 mm

Thickness

30 mm

Weight

27.8 kg

The TommaTech TT520-108TNB12R is a 520 W solar panel. Finding a compatible replacement requires matching the original electrical characteristics — particularly Voc, Vmpp, Isc, and temperature coefficients — to ensure safe operation within the same string.

Use the form above to find panels that match these specifications. Then verify the replacement in the String Compatibility Calculator with your inverter.

Other models in this series

Power	Voc	Isc
510 W	39.95 V	15.95 A
515 W	40.15 V	16.01 A
525 W	40.55 V	16.13 A
530 W	40.75 V	16.19 A
535 W	40.95 V	16.25 A

Frequently Asked Questions

What specs must match when replacing the TommaTech TT520-108TNB12R?

The most critical specs to match are: cell count (must be exactly 108), Voc close to 40.35 V (within ±5%), and temperature coefficient TcVoc close to -0.25%/°C. If Voc differs significantly, the string voltage at extreme temperatures may shift outside the inverter's MPPT range. The replacement finder above pre-screens all candidates by these criteria.

Can I use a higher wattage replacement for the TommaTech TT520-108TNB12R?

A higher wattage panel usually has a higher Vmpp or Isc, which can affect string voltage and current. Small increases (up to 10–15%) are typically safe if the other electrical specs align. The replacement finder shows a compatibility score — 'Exact match' means the specs align closely. Always verify the replacement in the String Compatibility Calculator with your inverter before installation.

What happens if the replacement panel has different voltage specs?

If the replacement has a significantly different Voc or Vmpp, the string voltage may shift outside the inverter's MPPT range, reducing energy production or causing faults. This effect is amplified at temperature extremes: at low temperatures, voltage rises by the TcVoc coefficient. The replacement finder automatically accounts for this — it scores candidates by how closely the electrical specs match the original TommaTech TT520-108TNB12R.