Just guessing here, because I know very little about these newfangled D3s .... but is there maybe some kind of fan speed controller that could be at fault? The power coming from the solar panels will be quite weak, so it's likely that it bypasses any fan speed control device to enable it to give every bit of power it's able to deliver directly to the motor. In fact I think Andrew had a similar issue with his D2 blower, did he not? If I understand correctly, the D2 has some kind of inline power/voltage regulator (aka 'the hedgehog') which was a likely suspect in his case. I'm wondering if the D3 has a similar power control unit.
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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