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Old 03-03-2021, 12:45 AM   #21
Bus Crazy
 
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1:1 is better still, each gets its own MPPT operation

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Old 03-03-2021, 12:47 AM   #22
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Originally Posted by john61ct View Post
1:1 is better still, each gets its own MPPT operation
So set up 2 MPPT controllers? Is that why you were directing me to the 75/15 or the 100/20 previously? One of those for each panel?
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Old 03-03-2021, 12:54 AM   #23
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Yes 1:1 is ideal, other than wall space and extra wiring, but thinner AWG / less voltage loss

12Vnom system?

Into LFP avoiding the shoulder so 13.8V, 100/20 would output 275W, would be the best-value proposition since actual output higher than that would be a tiny percentage of the time (even tilting the panels)

at 14.8V for lead (depends on batt model spec profile) 20A would be plenty.

But 100/30 would be fine if money were not a factor.
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Old 03-03-2021, 12:57 AM   #24
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Originally Posted by john61ct View Post
12Vnom system?

Into LFP avoiding the shoulder so 13.8V, 100/20 would output 275W, would be the best-value proposition since actual output higher than that would be a tiny percentage of the time (even tilting the panels)

at 14.8V for lead (depends on batt model spec profile) 20A would be plenty.

But 100/30 would be fine if money were not a factor.
Yes 12v LiFePO4. 200-300ah bank. This has helped immensely!
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Old 03-03-2021, 01:07 AM   #25
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That's decent capacity, you'll need additional energy inputs if using more than half

figure 30Ah per day from 600W panelage, and that only in great insolation conditions
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Old 03-03-2021, 01:16 AM   #26
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Originally Posted by john61ct View Post
That's decent capacity, you'll need additional energy inputs if using more than half

figure 30Ah per day from 600W panelage, and that only in great insolation conditions
I intend on having DC-DC as well as shore outlet/genset connection (Xantrex 2000w/80a inv/chg) should weather/coverage not allow the solar to keep up. We won't be power hogs by any means. Only loads will be some 12v lighting, water pump, WH ignition, and refrigerator. Air conditioner will be set to shore power only. No microwave, tv or other gadgets. Still trying to decide on 12v vs 110v fridge. At the end of the day, those seem to be relatively comparable in power consumption when comparing upright models. But 12v is $1k vs a $200-300 for 110v. I'd rather throw more money at the electrical system rather than the moderately more efficient 12v fridge.
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Old 03-03-2021, 01:25 AM   #27
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Believe me with a good supply the load demands will grow

I'm a deep skeptic on that issue of mains models being nearly as efficient, but then I never wanted an upright.

Multiple identical portables that can switch between freezer or fridge mode is my reco for efficiency and flexibility, also a top performance cooler with ice for drinks and 2-3 days' food to cut down on opening. Some people swear by those counter top ice makers for using excess solar and otherwise plentiful inputs.
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