Thank you Allan, Dan and Ray for your suggestions.This is the kind of
feedback I was hoping for!
I agree that the 75W of PV with 120AH of sealed battery is too low of a
ratio of PV to storage and will not help the batteries last 7 years.
Unfortunately those parts of the design are pre-determin
I missed the part about limiting the design to a 75 w module. That's
only a C30 charge rate, which I think is too low for the battery size.
That's apparently a 5 day at 80% DOD criteria; very 90s. Haven't they
heard about $1/w PV?
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Install
Hey Mr. Ray ...
Aren't you just a gluttony of good info! You're darned handy to have around.
I wasn't aware of the Midnite unit. I'll have to scope it out.
I'm concerned with Eric's mention of the bid requiring a 120AH battery (~1.5
kWh) .. and only 75W PV. Hopefully their loads are small,
I'll chime back in on a few points:
To MPPT or not: It all gets down to the budget: I find the tipping
point to be around 250 to 400 watts. My small systems usually don't
have MPPT, and as soon as I get into more than a pair of modules, I'm
using the cheaper 60 cell modules with MPPT.
I like
Eric .. Allan .. and all ...
Allan wrote:
> Re an MPPT controller: Nope, I wouldn't. First, this is equatorial west
> Africa.
> It's a tropical climate with hot modules most of the year. MPPT offers the
> greatest benefit when the voltage delta-T is greatest: cold modules and empty
> batteries.
Dan and Eric,
Now I'll respectfully argue with some of Dan's suggestions:
Re an MPPT controller: Nope, I wouldn't. First, this is equatorial
west Africa. It's a tropical climate with hot modules most of the
year. MPPT offers the greatest benefit when the vo
No, I monitored it, and verified by looking at the historic
consumption. EVERYTHING is on its own circuit breaker. The owner lost
his building in 911 and built this house (I believe) because of wanting
something that he believed would give him the flexibility for many
contingencies.
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