Capt Bill
Sailing Options
I just received 18 Envision AESC 305Ah cells (2 extras) from 18650 Battery Store. Here's a few pictures with my takes. This battery build will be the kWh power for an EG4 3000 (initially wo solar) set up as a 120 vac Grid Back Up to essential circuits separated from main breaker panel via one of those 10 Circuit Breaker Box - Transfer Switch Kit (at my girlfriend's house).
1st heard of Envision AESC on this thread; a 2021 DIYSolarForum thread brings up info about Envision 315Ah cells. Read "AESC (Automotive Energy Supply Corporation) was founded as a joint venture between Nissian and NEC-Tokin ... signed a 2022 deal to supply BMW with automotive grade cells."
I tested an earlier one cell order. Charged to 3.6v; then tested via a 200 Watt Fan Ah Tester; got 300 Ah (still not sure about these low 20 amp draw tests). Also after re-charge to 3.58 v; dropped to 3.454 v on 3rd day, & to 3.449 v after 8 days sitting. The better test for me will be hooking up BMS and EG4 3000, ... to see how cell balance looks through some full high amp charge and discharge cycles. (will report later
Re Full B Grade Order: Foam Packing was best I seen. Cell voltages arrived at 3.291 to 3.294 volts. Bar code on top gone. Sticker bar code on side (see pics). One battery had small pecks on edge (see pic/ will cover with electrical tape). I expected side bulges (three previous earlier EVE 280Ah LiFePO4 orders all had some bulges too). With battery cells pressed together (in full project picture); I measured 3.2 mm to 5.6 mm between battery sides (divided by two = approx side bulges on each cell. (UPDATE: After fuller charge before top balance; cell spacing increased to 4.55 mm to 6.35 mm; ÷ 2 for approx bulges. ... I am NOT Compressing my cells, and if you are, this might not fit. The Envision AESC Battery Terminals have a smaller diameter bus bar contact than my aged 2 - 3 year old EVE Cells (see pic). I prefer fuller bus bar contact for higher amperage capabilities; but stepping up from my 24 volt home solar set up experiences) to my first 48 volt build mean half the amperage for same 120vac Watts; ... so my take is this is OK for me! I wonder if these were former Envision AESC 315 Ah cells, and how long they have been in a storage mode (have not asked yet) .
My Take: Looked like a Good Bet at an Economical Price. Will report more later. ... :+)
1st heard of Envision AESC on this thread; a 2021 DIYSolarForum thread brings up info about Envision 315Ah cells. Read "AESC (Automotive Energy Supply Corporation) was founded as a joint venture between Nissian and NEC-Tokin ... signed a 2022 deal to supply BMW with automotive grade cells."
I tested an earlier one cell order. Charged to 3.6v; then tested via a 200 Watt Fan Ah Tester; got 300 Ah (still not sure about these low 20 amp draw tests). Also after re-charge to 3.58 v; dropped to 3.454 v on 3rd day, & to 3.449 v after 8 days sitting. The better test for me will be hooking up BMS and EG4 3000, ... to see how cell balance looks through some full high amp charge and discharge cycles. (will report later
Re Full B Grade Order: Foam Packing was best I seen. Cell voltages arrived at 3.291 to 3.294 volts. Bar code on top gone. Sticker bar code on side (see pics). One battery had small pecks on edge (see pic/ will cover with electrical tape). I expected side bulges (three previous earlier EVE 280Ah LiFePO4 orders all had some bulges too). With battery cells pressed together (in full project picture); I measured 3.2 mm to 5.6 mm between battery sides (divided by two = approx side bulges on each cell. (UPDATE: After fuller charge before top balance; cell spacing increased to 4.55 mm to 6.35 mm; ÷ 2 for approx bulges. ... I am NOT Compressing my cells, and if you are, this might not fit. The Envision AESC Battery Terminals have a smaller diameter bus bar contact than my aged 2 - 3 year old EVE Cells (see pic). I prefer fuller bus bar contact for higher amperage capabilities; but stepping up from my 24 volt home solar set up experiences) to my first 48 volt build mean half the amperage for same 120vac Watts; ... so my take is this is OK for me! I wonder if these were former Envision AESC 315 Ah cells, and how long they have been in a storage mode (have not asked yet) .
My Take: Looked like a Good Bet at an Economical Price. Will report more later. ... :+)
Attachments
Last edited:
.
