Not being helpful but I walk away from these. It will come back to
you.
Dave Angelini Offgrid Solar
"we go where powerlines don't"
[1]https://offgridsolar1.com/ [2] [1]
e-mail offgridso...@sti.net
text 209 813 0060
On 2024-04-23 2:40 pm, Jason Szumlanski via RE-wrenches wrote:
I have an off-grid client who is working on replacing old equipment at
a cabin. He has a lot of 12 volt distribution in the house for
lighting, fans, and a 12 volt refrigerator. He also has 120 volt AC
loads that run through a separate distribution panel where the only
source is a 2000 Watt Honda generator. There is no inverter present.
The batteries are charged through a Trace C40.
He currently has a few ancient solar panels and a struggling Bank of
AGM batteries. It's time for an upgrade. I can easily supply enough PV
power for what he needs. He currently has a 9 kilowatt hour battery
capacity that he was happy with when the batteries operated optimally.
Nonetheless, I would probably future-proof him with a 10 to 15 kilowatt
hour LiPo to double or triple his usable capacity.
For convenience, obviously it would be nice to have an inverter to
eliminate or reduce the generator requirement. But he seems committed
to keeping his 12 volt distribution because it would be costly to
replace fixtures. I think he would consider replacing the 12 volt
refrigerator if he has an inverter.
He definitely wants LiPo batteries.
I don't like the idea of 12 volt direct from a battery plus connecting
an inverter to that same battery. It is going to be hard to measure and
monitor things.
I am thinking about using a 48 volt battery with a single phase 120
volt inverter, getting him to change to a 120 volt refrigerator, and
using a DC converter to give him somewhere in the range of 100 amps at
12 volts for his existing DC lighting and fan loads. Is this a bad
idea? Should I stick with a 12 volt battery system? He does have a tiny
12 volt pressure pump which might be an issue for the converter. I'm
not sure. I am a bit worried about the efficiency loss and capacity of
DC converters and not sure how to size it.
Jason Szumlanski
Florida Solar Design Group
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[2] https://offgridsolar1.com/
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