Find replacement for TommaTech TT645-132TNB12R

645 W TOPCon solar panel with 132 cells. Voc 49.99 V · Isc 16.32 A · TcVoc -0.26%/°C.

Original Panel

Select the panel you want to replace

Same technology onlyShow only panels with matching cell technology

Compatible Replacements

25 panels found · 3405 panels excluded

TommaTech TT645-132TNB12R G2G

645 W

TOPCon

100Exact match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.99 V	0.0%
Vmpp	42.02 V	42.02 V	0.0%
Isc	16.32 A	16.32 A	0.0%
Impp	15.35 A	15.35 A	0.0%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT640-132TNB12R G2G

640 W

TOPCon

92Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.79 V	0.4%
Vmpp	42.02 V	41.82 V	0.5%
Isc	16.32 A	16.26 A	0.4%
Impp	15.35 A	15.31 A	0.3%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT650-132TNB12R G2G

650 W

TOPCon

92Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	50.19 V	0.4%
Vmpp	42.02 V	42.22 V	0.5%
Isc	16.32 A	16.38 A	0.4%
Impp	15.35 A	15.4 A	0.3%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT640-132TNB12R

640 W

TOPCon

92Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.79 V	0.4%
Vmpp	42.02 V	41.82 V	0.5%
Isc	16.32 A	16.26 A	0.4%
Impp	15.35 A	15.31 A	0.3%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT650-132TNB12R

650 W

TOPCon

92Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	50.19 V	0.4%
Vmpp	42.02 V	42.22 V	0.5%
Isc	16.32 A	16.38 A	0.4%
Impp	15.35 A	15.4 A	0.3%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT635-132TNB12R G2G

635 W

TOPCon

84Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.59 V	0.8%
Vmpp	42.02 V	41.62 V	1.0%
Isc	16.32 A	16.2 A	0.7%
Impp	15.35 A	15.26 A	0.6%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT655-132TNB12R G2G

655 W

TOPCon

84Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	50.39 V	0.8%
Vmpp	42.02 V	42.42 V	1.0%
Isc	16.32 A	16.44 A	0.7%
Impp	15.35 A	15.45 A	0.7%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT635-132TNB12R

635 W

TOPCon

84Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.59 V	0.8%
Vmpp	42.02 V	41.62 V	1.0%
Isc	16.32 A	16.2 A	0.7%
Impp	15.35 A	15.26 A	0.6%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT655-132TNB12R

655 W

TOPCon

84Good match

Parameter	Original	Replacement	Deviation
Voc	49.99 V	50.39 V	0.8%
Vmpp	42.02 V	42.42 V	1.0%
Isc	16.32 A	16.44 A	0.7%
Impp	15.35 A	15.45 A	0.7%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT630-132TNB12R G2G

630 W

TOPCon

76Acceptable

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.39 V	1.2%
Vmpp	42.02 V	41.42 V	1.4%
Isc	16.32 A	16.14 A	1.1%
Impp	15.35 A	15.22 A	0.8%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

Trina Solar TSM-NEG19R.20-625

625 W

TOPCon

76Acceptable

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.9 V	0.2%
Vmpp	42.02 V	41.7 V	0.8%
Isc	16.32 A	15.92 A	2.5%
Impp	15.35 A	15 A	2.3%
TcVoc	-0.26 %/°C	-0.24 %/°C	±0.020 %/°C
TcPmax	-0.3 %/°C	-0.29 %/°C	±0.010 %/°C

TommaTech TT630-132TNB12R

630 W

TOPCon

76Acceptable

Parameter	Original	Replacement	Deviation
Voc	49.99 V	49.39 V	1.2%
Vmpp	42.02 V	41.42 V	1.4%
Isc	16.32 A	16.14 A	1.1%
Impp	15.35 A	15.22 A	0.8%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°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

49.99 V

Vmpp

42.02 V

Isc

16.32 A

Impp

15.35 A

TcVoc

-0.26 %/°C

TcPmax

-0.3 %/°C

Pmax

645 W

Cells

132

Length

2382 mm

Width

1134 mm

Thickness

35 mm

Weight

31.1 kg

The TommaTech TT645-132TNB12R is a 645 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
620 W	48.99 V	16.02 A
625 W	49.19 V	16.08 A
630 W	49.39 V	16.14 A
635 W	49.59 V	16.2 A
640 W	49.79 V	16.26 A
650 W	50.19 V	16.38 A
655 W	50.39 V	16.44 A

Frequently Asked Questions

What specs must match when replacing the TommaTech TT645-132TNB12R?

The most critical specs to match are: cell count (must be exactly 132), Voc close to 49.99 V (within ±5%), and temperature coefficient TcVoc close to -0.26%/°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 TT645-132TNB12R?

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 TT645-132TNB12R.