Solar? Anyone?

ericlp

Diamond Member
Dec 24, 2000
6,133
219
106
Currently, I have 8 300 watt panels to run the home. But, I still have to conserve power because, just because you have 2400 watts of power, as soon as it travels down from the charge controller or to be stored into a battery, or even if the batteries are topped off and by passing the batteries, going directly to the converter and then from there to the PC, I'm guessing that 20% of that energy is wasted in the process of converting 48 volts to 120 Volts even tho, I have an outback 3000 watt inverter that supposedly is 90% efficient. But just going back into a power supply where the voltage is converted back down from 120 volts to 5/12 volts, as we all known even the best power supplies lose at least 10% in that process. So, if I add in my power supply it's more like 30% power wasted before I can even crank out one Work Unit. Don't even ask what the conversion rate is when it's dark out, and I have to pull from the battery bank as it's just ridiculously stupid, probably be lucky to get 50% power usage.

So, I turn off my equipment and haven't been really seriously pursuing as I'd rather have my refrigerator running than my seti crunching rig! I know call me paranoid! haha... But, I've been thinking about expanding, well, not expanding, as in running two separate maybe another 8 panels that are connected to a charge controller, and on a UPS battery bank made up of lithium ion batteries instead. Enough juice to power a 800 watts for a few days. That way no big deal, if I run that batteries low enough and actually have to shut the computer down, at least the food in the fridge will remain cold and thus won't have to drag out the honda generator to keep everything going. Yeah, I know, it's going to be expensive. What we will go though to crunch a few numbers eh? I miss not having a high powered rig, and not just leaving it on 24hrs. A luxury only dreamed of by most.

My question is....... Anyone running on solar (sadly not enough wind here) to do hybrid, so I would have to rely on SOLAR only. And living in hawaii is the HIGHEST KW hour of about 50 cents when you factor in they want 35 bucks every month just to keep the line connected, and then it works out to about 43 cents a KW hour after that. Right.... I live on the big island that just makes matters worse, Oahu is lower but not by much. Anyway, if anyone is running high powered setup 24/7 on solar I'd like to see your setup.. Just have some extra cash and figured there must be other crazy F^#$%ers like me doing the same thing!

Peace out!
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
25,736
14,767
136
wrong forum, try the home and garden forum
 

Smoke

Distributed Computing Elite Member
Jan 3, 2001
12,649
198
106
Your experiences with solar are interesting. I have looked into solar several different times over the years but as of now the economics just don't work out for me. My average cost has been around 11 cents per kWh though that's supposed to start going up quite a bit when the Kemper Coal-Gasification Plant comes on line.
 

bds71

Member
Nov 29, 2016
60
31
46
I'm not sure about Hawaii, but stateside it's not uncommon to do grid-tie systems. that way, when you're (WAY) overproducing (depending on location of course) during the middle of the day (sun's apex) you send some of that energy back to the provider. in some single-meter cases the meter will actually spin backwards during those times. but, in dual-meter set-ups you have a meter each for incoming and outgoing. either way, you're compensated for the returned energy. it is possible to have a net-zero balance this way and never have to rely on (very) expensive batteries.

some notes for those thinking about solar:
1. you will NEVER average what the system is rated for (they actually have two ratings now a lot of the time) = expect around 70% of the rated output on average (and be pleasantly surprised if you get more). this is for central TX, your location might be different.

2. figure out how much electricity you want to use BEFORE buying panels to size it correctly for your usage. trying to live on 2400W (rated) system will be nearly impossible even with the most frugal sippers of electricity. alternatively you can do the math based on how much you want to save (dollars) rather than how much electricity usage you want to get.

3. know how much sunshine your area gets - there are charts online that give you a rough estimate. eg:my area gets (on average) ~5.2 hrs of (peak) sunshine a day. we also get ~220 days of usable sunshine a year here. using this and applying it to a 5k (rated) system we get the following: 5.2 hrs x 220 days = 1144 hrs/yr. a 5k system will give about 3.5 kW on average. so 3.5 kW x 1144 hrs/yr = 4004 kW hrs/yr. 4004/365 = 10.97 kW hrs/day. 10.97 kW hrs/day / 24 = 457 W/hr on average. the average house here in TX consumes about 1655 W/hr (govt study results). with my love of computers I might use closer to 2000 W/hr. given all this information I would need ~20kW grid-tied system to have a net-zero solar system.
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
16,280
3,903
75
I recall a family who made a team about only doing DC with solar power. What I can't recall is where I saw them - I think it was PrimeGrid, but I can't find them now.
 

ericlp

Diamond Member
Dec 24, 2000
6,133
219
106
Thanks all, I am running my system on solar now, and actually doing DC on an old Samsung S6 8 core, but what I want to get is the newer nvidia 1080 pascal GPU's / ZOTAC GeForce GTX 1080 8GB GDDR5X Liquid Cooling Waterblock
Maybe two of them and a hexacore intel chip.

Intel Core i7-5820K Haswell-E 6-Core 3.3 GHz LGA 2011-v3 140W

of course water cooled as well... A rig like this would crunch though some serious watts and work units. Since it would be on 24/7 running pretty much max power, to get the best stability and life out of the hardware, I am going to go with water cooling.

Most people on solar want to CONSERVE Power, as running a rig like this is going to take up some serious power draw, and powering it on 24/7 will be a trick on renewable power.

Grid Tie over here is....... A no go. As all the slots are full, The power company here says they are at maximum capacity for grid tie.

I have to look into lithium ion batteries that can take the abuse of being drained by a large percentage and charged back up in the day.

Thanks again, all. I was just hoping I'd find someone already doing it, as it's a lot easier to see the up and downs and what they would have done differently et...etc..
 

LightningZ71

Golden Member
Mar 10, 2017
1,658
1,939
136
I hate to revive a thread that seems to be dead, but have you considered the other end of the spectrum? Instead of one immensely powerful rig to crunch away, there are some low cost, very low power ARM based little compute boxes that run android out there. They are, as a whole, very power efficient, requiring no active cooling (or one tiny fan). If you do enough research, there are some that deliver respectable crunching performance per watt and aren't that expensive to purchase. They use the android client mostly, though there are some projects that let you install linux on them and run the normal linux client and it detects the processor type.
 
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