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G
GHA
Well-known member
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Hopefully somewhere warm
Joined
26 Jun 2013
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G
GHA
replied to the thread
Beta Marine alternators
.
Nope. It's how batteries work. Very little difference to the alternator anyway, just be a bit of voltage drop down the cable which will...
Saturday at 19:00
G
GHA
replied to the thread
Beta Marine alternators
.
That's what happens with lead acid. they'll take a load of current up to maybe 80% SOC or more depending on how much is going in then...
Saturday at 15:33
G
GHA
replied to the thread
Aldi Lithium Batteries
.
Basic thing with lifepo4 is don't go too high or too low with the voltage. The BMS management should disconnect the battery if it does...
Saturday at 10:12
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
I fiddled for ages to try & get the smartshunt as close to reading accurately each cycle without resetting soc & left it a tiny bit...
21 Mar 2024
G
GHA
reacted to
vas's post
in the thread
304Ah LifePO Update - Year 2
with
Like
.
in the above graph you see all 8 cell values and you may ignore the top two lines (yellowish and green) which are the shunt and bank...
21 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
Yep, short timescale & a load of noise from solar & looks like laptop was on. It's the start of the knee for sure, just stops earlier...
21 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
That's a very fat line 😁 Mine hit the knee at a fraction under 13.6v, day after day. 3.4v per cell. Max about 15A solar into 300Ah...
21 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
Ended up getting a bit complex, basically 4 op amps measure the voltage of each cell based on something like this -- Then a little...
21 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
Personally if you are looking a plotted cell data then your call really. I really think we are fooling ourselves if we think we can...
21 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
Agree, the offgrid garage data shows this. Thus the thought above that so many people desperate to stay up there to balance every day...
20 Mar 2024
G
GHA
reacted to
geem's post
in the thread
304Ah LifePO Update - Year 2
with
Like
.
I don't think true 100% is that important. The difference in charge as soon as you climb the knuckle part of the curve is small. Stress...
20 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
What did the published papers take as 100% charged though? Datasheet for mine says "0.5 C constant current charge to 3.65 V for cell...
20 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
What's fully charged though? And how much difference does "almost" make to lifespan? Offgrid garage has loads of test data, I go up...
20 Mar 2024
G
GHA
replied to the thread
304Ah LifePO Update - Year 2
.
I don't see any problem going a bit big. As you say the money isn't that great and we're in unknown territory regarding lifespan, could...
20 Mar 2024
G
GHA
reacted to
gregcope's post
in the thread
304Ah LifePO Update - Year 2
with
Like
.
Hi All, Thought I would give an update on year two of my DIY 304Ah Build. Some data; Some observations; Battery One is 316Ah...
20 Mar 2024
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