Dan, et al,
Once the board has been cleaned sufficiently that the inverter is no
longer operating intermittently and your hope has been realized, when
would you apply a field conformal coating? Would you choose/recommend
something better than Krylon clear spray?
Bill Loesch
Solar 1 - Saint
On 8/16/2013 2:38 AM, Bill Loesch wrote:
Dan, et al,
Once the board has been cleaned sufficiently that the inverter is no
longer operating intermittently and your hope has been realized, when
would you apply a field conformal coating? Would you choose/recommend
something better than Krylon
Bill,
My short answer is .. if things work after all this .. I wouldn't recommend
doing anything to the circuit board after cleaning it. Instead, I'd take steps
to keep the mice from ever getting into the inverter again.
Long answer...
Normally, circuit boards will have been coated with a
Thanks Dan,
That was an interesting read I thoroughly plan to never have to do that
anything that I or my customers own !
Bob ellison
Bob Ellison
On Aug 16, 2013, at 8:11 AM, Exeltech exelt...@yahoo.com wrote:
Bill,
My short answer is .. if things work after all this .. I wouldn't
Hello Jay,
For those of us not so adventurous, how well would electrical spray Cleaner
work?
Good question. I've never used contact/electrical cleaner for this type of
task. My guess is, it might work .. but only marginally if at all. Cleaners
are solvents intended to remove oxidation
Friends:
We have been receiving a flurry of requests for design of off-grid systems
where the loads are enormous, relative to normal off-grid requirements. It
is obvious that the size of PV and battery arrays to power these loads is
beyond what is practical. We have dubbed these systems
Hi William;
One thing to consider is that you want to cycle the batteries at least
20% DOD. If you look at the cycle charts for regular Lead acid
batteries, the total KWH you can get from a battery for its lifetime is
fairly equal from around 20% DOD to 80% DOD. (basically you can get
twice
off-grid systems where the loads are enormous,
i realize this is not popular now in these days of solar is so cheap, but i
will not work for people who wont conserve or be efficient.
as we all know, pv contains lots of embedded energy and to my thinking...
having it power waste is simply
Wrenches:
Oh yeah, I forgot to mention: Todd, you can hold the lecture: I agree with
you but the repetition is wasting energy.
William
On Aug 16, 2013, at 12:01 PM, toddc...@finestplanet.com wrote:
off-grid systems where the loads are enormous,
i realize this is not popular now in
William,
Sounds like the coating on the board wasn't of the best quality. It reacted
with the alcohol (which good conformal coatings won't), but has since dried,
and should be OK. (The better silicone-based conformal coatings react only
with acetone, and then very slowly at that.)
Visual
Jay:
There are four systems in question. In three the loads are year round and
one is summer only AC loads. The year round loaded systems have loads day
and night.
One is a highway maintenence station with at least 4 residences.
One is a family compound with two homes with electric ranges,
Not to hijack the thread, but I'd like to add that the inverter rating
required for enormous loads can also be beyond practical limits. We are
getting a flood of grid-tie with PV and battery backup requests for whole
house coverage. The reason for the consumer demand is obvious here in
Hi William
Thx helps a lot.
I can only say how I do it.
I'll give the client some options, including the change of appliances and
usually the price difference makes the sale one way or the other.
Funny reminds me of the old days, only with much smaller loads/$.
Good luck
Jay
Sent from
Hi William,
In off grid applications, you want to have sufficient RE to keep up with
load demand
and only run the generator when RE cannot keep up. However, having too
much RE is a waste because it will
result in energy not harvested (if regulating), however, diversion
controllers can allow
Honestly, William, in these type of cases I usually walk away from the job
if the customer isn't willing to reduce where possible. There is no such
thing as a completely fool proof off grid PV system. Like a good lawyer,
the best way to have a stellar record is to know which cases to
takejust
Hi William,
I have done many systems in identical situations share your philosophy.
Remote communities, work camps, highway maintenance compounds, etc...
I have used two general philosophies on batteries for these systems.
1. Cheap batteries, ie L16's. Cycle them hard and realize they
I find its also about the money. If they're expecting a $20k system to
perform like a $100k one, then yes, move on. I agree with Daryl that
you keep a good record by picking your clients.
On the other hand, I have some fairly wealthy customers that don't want
to reduce their loads, and are
Hi Kevin;
Which watering system did you find that worked? We've been through a
bunch that were worse than no watering system at all.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 8/16/2013 5:38 PM, Kevin
Friends:
I am a bit surprised at the responses I have gotten on this thread. I
appreciate the technical advice and I don't mind the polite philosophical
discussion like the one below. However, I received one reply, fortunately
off-line, that was not very polite, to say the least.
I have been
Folks,
I've heard lots of good advice on this subject and as an old off-grid system
designer, energy conservation has long been a field I take seriously.
Generating power that you wouldn't otherwise need because you refuse to use the
power wisely is just... Stupid. Stupid financially and
If the customer wants a mega system and is willing to pay for
it, why is it our business to judge them?
hi ray,
is it judging them? or simply saying:
i do this work because i believe in trying to make a more sustainable world...
and i will not enable waste. i do not care what these
so sorry list members, this was supposed to be off list.
todd
On Friday, August 16, 2013 8:51pm, toddc...@finestplanet.com said:
If the customer wants a mega system and is willing to pay for
it, why is it our business to judge them?
hi ray,
is it judging them? or simply saying:
With all due respect, Ozzie Zehner—cited in the piece that Todd notes below—is
at least a bit whacked. Read his entire diatribe of an error-filled book,
which I have. Geez…..talk about making condemnatory judgments…most of Zehner’s
book is pretty much a judgment filled rant.
Since when do
Its alright Todd. I'm actually about as hippie as you get. I started in
PV in the Peace Corp in Africa in the 80s doing water pumping systems.
I built a solar adobe with my own hands from my own mud. Raised my kids
there. I built electric vehicles when I realized that our energy habit
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