Find replacement for TommaTech TT420-108TNFB10 Dark Series

420 W TOPCon solar panel with 108 cells. Voc 37.91 V · Isc 13.95 A · TcVoc -0.26%/°C.

Original Panel

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Same technology onlyShow only panels with matching cell technology

Compatible Replacements

90 panels found · 3340 panels excluded

Jolywood JW-HT108N-420

420 W

TOPCon

94Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	37.9 V	0.0%
Vmpp	31.94 V	31.9 V	0.1%
Isc	13.95 A	13.98 A	0.2%
Impp	13.15 A	13.17 A	0.2%
TcVoc	-0.26 %/°C	-0.25 %/°C	±0.010 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT420-108TN10

420 W

TOPCon

93Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.11 V	0.5%
Vmpp	31.94 V	31.94 V	0.0%
Isc	13.95 A	13.95 A	0.0%
Impp	13.15 A	13.15 A	0.0%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT420-108TNB10

420 W

TOPCon

93Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.11 V	0.5%
Vmpp	31.94 V	31.94 V	0.0%
Isc	13.95 A	13.95 A	0.0%
Impp	13.15 A	13.15 A	0.0%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT420-108TNB10 G2G

420 W

TOPCon

93Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.11 V	0.5%
Vmpp	31.94 V	31.94 V	0.0%
Isc	13.95 A	13.95 A	0.0%
Impp	13.15 A	13.15 A	0.0%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT415-108TNFB10 Dark Series

415 W

TOPCon

89Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	37.71 V	0.5%
Vmpp	31.94 V	31.74 V	0.6%
Isc	13.95 A	13.88 A	0.5%
Impp	13.15 A	13.08 A	0.5%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT425-108TNFB10 Dark Series

425 W

TOPCon

89Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.11 V	0.5%
Vmpp	31.94 V	32.14 V	0.6%
Isc	13.95 A	14.03 A	0.6%
Impp	13.15 A	13.23 A	0.6%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

Jolywood JW-HT108N-425

425 W

TOPCon

85Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.1 V	0.5%
Vmpp	31.94 V	32.1 V	0.5%
Isc	13.95 A	14.05 A	0.7%
Impp	13.15 A	13.24 A	0.7%
TcVoc	-0.26 %/°C	-0.25 %/°C	±0.010 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

LONGi LR5-54HPH-425M

425 W

PERC

85Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	37.9 V	0.0%
Vmpp	31.94 V	31.94 V	0.0%
Isc	13.95 A	14.08 A	0.9%
Impp	13.15 A	13.31 A	1.2%
TcVoc	-0.26 %/°C	-0.265 %/°C	±0.005 %/°C
TcPmax	-0.3 %/°C	-0.34 %/°C	±0.040 %/°C

Jolywood JW-HT108N-415

415 W

TOPCon

84Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	37.7 V	0.6%
Vmpp	31.94 V	31.7 V	0.8%
Isc	13.95 A	13.91 A	0.3%
Impp	13.15 A	13.1 A	0.4%
TcVoc	-0.26 %/°C	-0.25 %/°C	±0.010 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT425-108TN10

425 W

TOPCon

83Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.31 V	1.1%
Vmpp	31.94 V	32.14 V	0.6%
Isc	13.95 A	14.03 A	0.6%
Impp	13.15 A	13.23 A	0.6%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT425-108TNB10

425 W

TOPCon

83Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.31 V	1.1%
Vmpp	31.94 V	32.14 V	0.6%
Isc	13.95 A	14.03 A	0.6%
Impp	13.15 A	13.23 A	0.6%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

TommaTech TT425-108TNB10 G2G

425 W

TOPCon

83Good match

Parameter	Original	Replacement	Deviation
Voc	37.91 V	38.31 V	1.1%
Vmpp	31.94 V	32.14 V	0.6%
Isc	13.95 A	14.03 A	0.6%
Impp	13.15 A	13.23 A	0.6%
TcVoc	-0.26 %/°C	-0.26 %/°C	±0.000 %/°C
TcPmax	-0.3 %/°C	-0.3 %/°C	±0.000 %/°C

String Compatibility Calculator

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Panel Matcher

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Original Panel Specs

Voc

37.91 V

Vmpp

31.94 V

Isc

13.95 A

Impp

13.15 A

TcVoc

-0.26 %/°C

TcPmax

-0.3 %/°C

Pmax

420 W

Cells

108

Length

1722 mm

Width

1134 mm

Thickness

30 mm

Weight

21.45 kg

The TommaTech TT420-108TNFB10 Dark Series is a 420 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
415 W	37.71 V	13.88 A
425 W	38.11 V	14.03 A
430 W	38.31 V	14.1 A
435 W	38.51 V	14.17 A
440 W	38.71 V	14.24 A
445 W	38.91 V	14.31 A
450 W	39.11 V	14.38 A

Frequently Asked Questions

What specs must match when replacing the TommaTech TT420-108TNFB10 Dark Series?

The most critical specs to match are: cell count (must be exactly 108), Voc close to 37.91 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 TT420-108TNFB10 Dark Series?

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 TT420-108TNFB10 Dark Series.