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WARRANTY OBLIGATIONS | 9 Months Ended
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Sep. 30, 2023
Product Warranties Disclosures [Abstract] |
WARRANTY OBLIGATIONS | WARRANTY OBLIGATIONS The Company’s warranty obligation activities were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022 |  |
| (In thousands)
Warranty obligations, beginning of period | $ | 180,715 |  |  | $ | 96,551 |  |  | $ | 131,446 |  |  | $ | 73,377 |  |  |
Accruals for warranties issued during period | 12,477 |  |  | 13,370 |  |  | 44,992 |  |  | 33,591 |  |  |
Changes in estimates | (1,983) |  |  | 927 |  |  | (8,618) |  |  | 22,902 |  |  |
Settlements | (6,283) |  |  | (6,539) |  |  | (20,269) |  |  | (19,010) |  |  |
Increase due to accretion expense | 3,157 |  |  | 2,952 |  |  | 10,609 |  |  | 6,295 |  |  |
Change in discount rate(1) | 2,811 |  |  | — |  |  | 34,608 |  |  | (9,609) |  |  |
Other | (2,028) |  |  | (1,381) |  |  | (3,902) |  |  | (1,666) |  |  |
Warranty obligations, end of period | 188,866 |  |  | 105,880 |  |  | 188,866 |  |  | 105,880 |  |  |
Less: warranty obligations, current | (40,750) |  |  | (32,350) |  |  | (40,750) |  |  | (32,350) |  |  |
Warranty obligations, non-current | $ | 148,116 |  |  | $ | 73,530 |  |  | $ | 148,116 |  |  | $ | 73,530 |  |  |
(1) See Note 7, “Fair Value Measurements” for additional information about the monetary impact for change in the discount rate. Changes in Estimates During the three months ended September 30, 2023, the Company recorded a $2.0 million decrease in warranty expense from change in estimates, of which $9.2 million related to decrease in product replacement costs for Enphase IQ TM Battery storage systems and related accessories, partially offset for continuing analysis of field performance data and diagnostic root-cause failure analysis totaling $6.0 million for IQ TM System Controller and $0.7 million of prior generation products, as well as $0.5 million related to increase in product replacement costs for all other products. During the three months ended September 30, 2022, the Company recorded $0.9 million in warranty expense from change in estimates related to continuing analysis of field performance data and diagnostic root-cause failure analysis primarily for Enphase IQ Battery storage systems. During the nine months ended September 30, 2023, the Company recorded a $8.6 million decrease in warranty expense from change in estimates, of which $29.7 million related to a decrease in product replacement costs related to Enphase IQ Battery storage systems and accessories and $1.6 million related to decrease in product replacement costs for all other products, partially offset by $6.1 million for increasing the warranty period for the Enphase IQ Battery from 10 years to 15 years, and by $16.6 million related to continuing analysis of field performance data and diagnostic root-cause failure analysis primarily for Enphase IQ Battery storage systems and prior generation products. During the nine months ended September 30, 2022, the Company recorded $22.9 million in warranty expense from change in estimates, of which $14.0 million related to continuing analysis of field performance data and diagnostic root-cause failure analysis primarily for Enphase IQ Battery storage systems and prior generation products, $4.9 million is related to an increase in expedited freight costs and replacement costs and $4.0 million due to an increase in labor reimbursement rates.

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- Definition The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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