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1  Alternate cryptocurrencies / Mining (Altcoins) / Re: Direct DC Powering an Antminer ASIC With Solar / Alt Energy on: July 16, 2021, 04:56:45 PM
Quote from: skablast on July 12, 2021, 01:03:17 PM
I am trying to understand why you would like to go DC DC

I have a 10 kw solar and 3 rigs working on 220v in an Island configuration without being attached to the grid
If I compare the production of the solar hybrid inverter system (with 27 Kwh lithium batteryDC/DC)  with what has been used by the rigs the loss of the inverter is 5 % max.

the 5 %  is worth the effort ?

27 Kwh battery sounds massive. Does that run the rigs 24/7? I agree, a 5% win would not be worth the effort. Thanks! - This is what I've been looking for. Btw, that's only the loss on the inverter (DC to AC). The S9 power supply (AC to DC) has a small fan on it. How much additional loss do you get on the power supplies? I'll presume it's additional 5% loss. Panels are cheap so provisioning extra power for that would not affect CapEx. Do you think eliminating the inverter and power supply would significantly reduce CapEx?
2  Alternate cryptocurrencies / Mining (Altcoins) / Re: Direct DC Powering an Antminer ASIC With Solar / Alt Energy on: July 12, 2021, 12:32:08 PM
Quote from: Longhorn901 on January 20, 2021, 10:19:00 PM
The system is working better than expected for the past 3 weeks now.
There's a couple things I need to address though,
1) When changing hash rates the miner stops mining therefore the current draw drops off causing the battery voltage to spike up to around 14 - 14.5 volts.
     I'm thinking to add a relay between the solar panels and the charge controller to stop the charging until the miner comes back up.  

As I understood the Arduino is for limiting voltage coming from solar but gets tripped when miner decides to draw less power. I'm trying to setup an S9 Antminer on solar. As a beginner starting with DC to AC inverter and AC to DC "power supply unit" yet can't help but wonder if I should go straight DC to DC. What is your estimate on the efficiency gain from eliminating the AC step?
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