Thank you for your reply. I guess low battery power also will lead to bad fuel beffeciency if fuel pressure drops.
I think I'll go with a bigger battery pack, electric waterpump and an alternator full throttle kill switch.
According to what I read here and there, although it seems a bit high, the water pump draws about 8-10hp and the alternator 8hp at high rpm. So the increased power overrule the loss of 15kg.
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